use curl instead of wget for Drone CI builds

We're using JUnit 5 so leverage some new features to make reasonable
test groups.

.drone.yml

@@ -0,0 +1,26 @@
+kind: pipeline
+name: default
+
+steps:
+  - name: test-online
+    image: maven:3-jdk-11
+    environment:
+      VAULT_VERSION: 1.2.2
+    commands:
+      - curl -o vault_1.2.2_linux_amd64.zip https://releases.hashicorp.com/vault/1.2.2/vault_1.2.2_linux_amd64.zip
+      - curl -s https://releases.hashicorp.com/vault/1.2.2/vault_1.2.2_SHA256SUMS | grep linux_amd64 | sha256sum -c
+      - unzip vault_1.2.2_linux_amd64.zip
+      - rm vault_1.2.2_linux_amd64.zip
+      - mv vault /bin/
+      - mvn clean test
+    when:
+      branch:
+        - master
+  - name: test-offline
+    image: maven:3-jdk-11
+    commands:
+      - mvn clean test -P offline-tests
+    when:
+      branch:
+        - develop
+        - feature/*

.travis.yml

@@ -1,10 +1,6 @@
-branches:
-  only:
-    - master
 language: java
 jdk:
-  - oraclejdk8
-dist: trusty
+  - openjdk11
 install: true
 addons:
   sonarcloud:
@@ -12,14 +8,26 @@ addons:
     token:
       secure: "sM9OfX5jW764pn9cb2LSXArnXucKMws+eGeg5NnZxHRcGYt4hpBKLSregBSsBNzUoWVj0zNzPCpnh+UQvgxQzUerOqwEdjTBpy3SNPaxSn7UpoSg+Wz3aUmL9ugmx01b51/wMG4UCHEwTZt2tpgTPVtw8K6uSO78e0dSICCBHDnRcdQwOjMEQHIJJ/qHVRwuy/MzLCAP3W1JPZlsphZg9QsFyhB4hW97dE90joZezfocQIv2xI/r6k+BLz0pY6MxYCul0RiDumaiaej0CPvEJI/uSu//BAQjUdHw+mQgnKUYIbrn2ONOviwNfwdr94JyoZEN2B6zASUmNLjPf4AbIojDeyS+CrpQpm17EVm/Qk/Ds+Xra4PPPIcsZhiWzV0KoDUz9xLfXuRJ526VT5tDPiaeI7oETf0+8l+JIS1b399FyqHi7smzjpvC6GuKflQrbuHK4MuKzDh7WTHiqokGG4SS0wOQIaaHB3dfdwwQzPh6IM24e8CETxh3DjMeqUTU4DWmv5po55jZ934TtxVQvVN78bTG9O0zS9u+JmRY04OZ+OaXuFam6MfMUFQi0EPZzdGul/oWSibGUu3bNfVEBp60CnJwYNM/dKG6U7pJthLHvSwiQFOdKzHZ+l1jZJ4gPaXaIGqpwqVGr28ntqA/El1rytPixr2driE6bYMt5jw="
 env:
-  - PATH=$PATH:.
+  - PATH=$PATH:. VAULT_VERSION=1.2.2
 before_script:
-  - wget https://releases.hashicorp.com/vault/0.8.1/vault_0.8.1_linux_amd64.zip
-  - unzip vault_0.8.1_linux_amd64.zip
-  - rm vault_0.8.1_linux_amd64.zip
+  - |
+    if [ "$TRAVIS_BRANCH" = "master" ]; then
+      wget https://releases.hashicorp.com/vault/${VAULT_VERSION}/vault_${VAULT_VERSION}_linux_amd64.zip
+      wget -q -O - https://releases.hashicorp.com/vault/${VAULT_VERSION}/vault_${VAULT_VERSION}_SHA256SUMS | grep linux_amd64 | sha256sum -c
+      unzip vault_${VAULT_VERSION}_linux_amd64.zip
+      rm vault_${VAULT_VERSION}_linux_amd64.zip
+    fi
 cache:
   directories:
     - '$HOME/.m2/repository'
     - '$HOME/.sonar/cache'
 script:
-  - mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent package sonar:sonar
+  - |
+    if [ "$TRAVIS_BRANCH" = "master" ]; then
+      mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent package sonar:sonar
+    else
+      mvn clean test -P offline-tests
+    fi
+notifications:
+  slack:
+    secure: "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"

CHANGELOG.md

@@ -1,55 +1,164 @@
+## 0.8.1 (2019-08-16)
+### Fixes
+* Removed compile dependency to JUnit library (#30) 
+
+### Improvements
+* Updated ependencies
+
+### Test
+* Tested against Vault 1.2.2
+
+## 0.8.0 (2019-03-24)
+### Breaking
+* Moved Maven artifact to `de.stklcode.jvault:jvault-connector` (#28)
+* Removed support for `HTTPVaultConnectorFactory#withSslContext()` in favor of `#withTrustedCA()` due to
+
+### Features
+* Support for KV version 2 secret engine (#16)
+* Ability to pass custom mount point to KV v2 read/write methods (#25)
+
+### Improvements
+* refactoring of the internal SSL handling (#17)
+* `VaultConnector` extends `java.io.Serializable` (#19)
+* Added missing flags to `SealResponse` (#20)
+* Added replication flags to `HealthResponse` (#21)
+* Enforce TLS 1.2 by default with option to override (#22)
+* Build environment and tests now compatible with Java 10
+* Updated dependencies to fix vulnerabilities (i.e. CVE-2018-7489)
+* New static method `Token.builder()` to get token builder instance
+* New static method `AppRole.builder()` to get AppRole builder instance
+
+### Deprecation
+* `VaultConnectorFactory` is deprecated in favor of `VaultConnectorBuilder` with identical API (#18)
+* `AppRoleBuilder#withBoundCidrList(List)` is deprecated in favor of `AppRoleBuilder#withSecretIdBoundCidrs(List)` (#24)
+
+
+## 0.7.1 (2018-03-17)
+### Improvements
+* Added automatic module name for JPMS compatibility
+* Minor dependency updates
+
+### Test
+* Tested against Vault 0.9.5
+
+
+## 0.7.0 (2017-10-03)
+### Features
+* Retrieval of health status via `getHealth()` (#15)
+
+### Improvements
+* `seal()`, `unseal()` are now `void` and throw Exception on error (#12)
+* Adaptation to Vault 0.8 endpoints for `renew` and `revoke`, **breaking** 0.7 compatibility (#11)
+
+### Removed
+* Removed deprecated `listAppRoleSecretss()` (use `listAppRoleSecrets()`) (#14)
+
+### Test
+* Tested against Vault 0.8.3
+
+
 ## 0.6.2 [2017-08-19]
-* [fix] Prevent potential NPE on SecretResponse getter
-* [fix] Removed stack traces on PUT request and response deserialization (#13)
-* [improvement] Fields of InvalidResposneException made final
-* [deprecation] `listAppRoleSecretss()` in favor of `listAppRoleSecrets()` (#14)
-* [test] Tested against Vault 0.8.1, increased coverage
+### Fixes
+* Prevent potential NPE on SecretResponse getter
+* Removed stack traces on PUT request and response deserialization (#13)
 
-## 0.6.1 [2017-08-02]
-* [fix] `TokenModel.getPassword()` returned username instead of password
-* [fix]  `TokenModel.getUsername()` and `getPassword()` could produce NPE in multithreaded environments
-* [fix] `TokenData.getCreatinTtl()` renamed to `getCreationTtl()` (typo fix)
-* [test] Tested against Vault 0.7.3
+### Improvements
+* Fields of InvalidResposneException made final
 
-## 0.6.0 [2017-05-12]
-* [feature] Initialization from environment variables using `fromEnv()` in factory (#8)
-* [feature] Automatic authentication with `buildAndAuth()`
-* [feature] Custom timeout and number of retries (#9)
-* [feature] Connector implements `AutoCloseable`
-* [fix] `SecretResponse` does not throw NPE on `get(key)` and `getData()` 
-* [test] Tested against Vault 0.7.2
+### Deprecation
+* `listAppRoleSecretss()` in favor of `listAppRoleSecrets()` (#14)
+
+### Test
+* Tested against Vault 0.8.1, increased coverage
+
+
+## 0.6.1 (2017-08-02)
+### Fixes
+* `TokenModel.getPassword()` returned username instead of password
+* `TokenModel.getUsername()` and `getPassword()` could produce NPE in multithreaded environments
+* `TokenData.getCreatinTtl()` renamed to `getCreationTtl()` (typo fix)
+
+### Test
+* Tested against Vault 0.7.3
+
+
+## 0.6.0 (2017-05-12)
+### Features
+* Initialization from environment variables using `fromEnv()` in factory (#8)
+* Automatic authentication with `buildAndAuth()`
+* Custom timeout and number of retries (#9)
+* Connector implements `AutoCloseable`
+
+### Fixes
+* `SecretResponse` does not throw NPE on `get(key)` and `getData()`
+
+### Test 
+* Tested against Vault 0.7.2
+
+
+## 0.5.0 (2017-03-18)
+### Features
+* Convenience methods for DB credentials (#7)
+
+### Fixes
+* Minor bugfix in TokenBuilder
+
+### Deprecation
+* `SecretResponse.getValue()` deprecated
+
+### Test
+* Tested against Vault 0.7.0
 
-## 0.5.0 [2017-03-18]
-* [feature] Convenience methods for DB credentials (#7)
-* [fix] Minor bugfix in TokenBuilder
-* [deprecation] `SecretResponse.getValue()` deprecated
-* [test] Tested against Vault 0.7.0
 
 ## 0.4.1 [2016-12-24]
-* [fix] Factory Null-tolerant for trusted certificate (#6)
-* [test] StackTraces tested for secret leaks
-* [test] Tested against Vault 0.6.4
+### Fixes
+* Factory Null-tolerant for trusted certificate (#6)
 
-## 0.4.0 [2016-11-06]
-* [feature] Option to provide a trusted CA certificate (#2)
-* [feature] Deletion, revocation and renewal of secrets (#3)
-* [feature] Token creation (#4)
-* [feature] AppRole auth backend supported (#5)
-* [improvement] Support for complex secrets
-* [deprecation] App-ID backend marked as deprecated
+### Test
+* StackTraces tested for secret leaks
+* Tested against Vault 0.6.4
 
-## 0.3.0 [2016-10-07]
-* [feature] Retrieval of JSON objects (#1)
-* [test] Tested against Vault 0.6.2
 
-## 0.2.0 [2016-09-01]
+## 0.4.0 (2016-11-06)
+### Features
+* Option to provide a trusted CA certificate (#2)
+* Deletion, revocation and renewal of secrets (#3)
+* Token creation (#4)
+* AppRole auth backend supported (#5)
+
+### Improvements
+* Support for complex secrets
+
+### Deprecation
+* App-ID backend marked as deprecated
+
+
+## 0.3.0 (2016-10-07)
+### Features
+* Retrieval of JSON objects (#1)
+
+### Test
+* Tested against Vault 0.6.2
+
+
+## 0.2.0 (2016-09-01)
+### Improvements
 * Dependecies updated and CommonsIO removed
-* [fix] Fixed auth backend detection for Vault 0.6.1
-* [test] Tested against Vault 0.6.1
 
-## 0.1.1 [2016-06-20]
-* [fix] Check for "permission denied" without status code 400 instead of 403
-* [test] Tested against Vault 0.6.0
+### Fixes
+* Fixed auth backend detection for Vault 0.6.1
 
-## 0.1.0 [2016-03-29]
+### Test
+* Tested against Vault 0.6.1
+
+
+## 0.1.1 (2016-06-20)
+### Fixes
+* Check for "permission denied" without status code 400 instead of 403
+
+### Test
+* Tested against Vault 0.6.0
+
+
+## 0.1.0 (2016-03-29)
 * First release

README.md

@@ -1,9 +1,9 @@
 # Java Vault Connector 
 
 [![Build Status](https://travis-ci.org/stklcode/jvaultconnector.svg?branch=master)](https://travis-ci.org/stklcode/jvaultconnector)
-[![Quality Gate](https://sonarcloud.io/api/badges/gate?key=de.stklcode.jvault%3Aconnector)](https://sonarcloud.io/dashboard?id=de.stklcode.jvault%3Aconnector)
+[![Quality Gate](https://sonarcloud.io/api/project_badges/measure?project=de.stklcode.jvault%3Ajvault-connector&metric=alert_status)](https://sonarcloud.io/dashboard?id=de.stklcode.jvault%3Aconnector)
 [![License](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](https://github.com/stklcode/jvaultconnector/blob/master/LICENSE.txt) 
-[![Maven Central](https://img.shields.io/maven-central/v/de.stklcode.jvault/connector.svg)](https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22de.stklcode.jvault%22%20AND%20a%3A%22connector%22)
+[![Maven Central](https://img.shields.io/maven-central/v/de.stklcode.jvault/jvault-connector.svg)](https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22de.stklcode.jvault%22%20AND%20a%3A%22jvault-connector%22)
 
 ![Logo](https://raw.githubusercontent.com/stklcode/jvaultconnector/master/assets/logo.png)
 
@@ -17,8 +17,8 @@ Java Vault Connector is a connector library for [Vault](https://www.vaultproject
 * Authorization methods
     * Token
     * Username/Password
-    * AppID (register and authenticate) [_deprecated_]
     * AppRole (register and authenticate)
+    * AppID (register and authenticate) [_deprecated_]
 * Tokens
     * Creation and lookup of tokens
     * TokenBuilder for speaking creation of complex configuraitons
@@ -30,16 +30,17 @@ Java Vault Connector is a connector library for [Vault](https://www.vaultproject
     * Renew/revoke leases
     * Raw secret content or JSON decoding
     * SQL secret handling
+    * KV v1 and v2 support
 * Connector Factory with builder pattern
-* Tested against Vault 0.8.1
+* Tested against Vault 1.2.2
 
 
 ## Maven Artifact
-```
+```xml
 <dependency>
     <groupId>de.stklcode.jvault</groupId>
-    <artifactId>connector</artifactId>
-    <version>0.6.2</version>
+    <artifactId>jvault-connector</artifactId>
+    <version>0.8.1</version>
 </dependency>
 ```
 
@@ -49,21 +50,21 @@ Java Vault Connector is a connector library for [Vault](https://www.vaultproject
 
 ```java
 // Instantiate using builder pattern style factory (TLS enabled by default)
-VaultConnector vault = VaultConnectorFactory.httpFactory()
+VaultConnector vault = VaultConnectorBuilder.http()
  .withHost("127.0.0.1")
  .withPort(8200)
  .withTLS()
  .build();
 
 // Instantiate with custom SSL context
-VaultConnector vault = VaultConnectorFactory.httpFactory()
+VaultConnector vault = VaultConnectorBuilder.http()
  .withHost("example.com")
  .withPort(8200)
  .withTrustedCA(Paths.get("/path/to/CA.pem"))
  .build();
 
 // Initialization from environment variables 
-VaultConnector vault = VaultConnectorFactory.httpFactory()
+VaultConnector vault = VaultConnectorBuilder.http()
  .fromEnv()
  .build();
 ```
@@ -71,33 +72,33 @@ VaultConnector vault = VaultConnectorFactory.httpFactory()
 ### Authentication
 
 ```java
-// Authenticate with token
+// Authenticate with token.
 vault.authToken("01234567-89ab-cdef-0123-456789abcdef");
 
-// Authenticate with username and password
+// Authenticate with username and password.
 vault.authUserPass("username", "p4ssw0rd");
 
-// Authenticate with AppID (secret - 2nd argument - is optional)
-vault.authAppId("01234567-89ab-cdef-0123-456789abcdef", "fedcba98-7654-3210-fedc-ba9876543210");
+// Authenticate with AppRole (secret - 2nd argument - is optional).
+vault.authAppRole("01234567-89ab-cdef-0123-456789abcdef", "fedcba98-7654-3210-fedc-ba9876543210");
 ```
 
 ### Secret read & write
 
 ```java
 // Retrieve secret (prefix "secret/" assumed, use read() to read arbitrary paths)
-String secret = vault.readSecret("some/secret/key").getValue();
+String secret = vault.readSecret("some/secret/key").get("value", String.class);
 
-// Complex secret
+// Complex secret.
 Map<String, Object> secretData = vault.readSecret("another/secret/key").getData();
 
-// Write simple secret
+// Write simple secret.
 vault.writeSecret("new/secret/key", "secret value");
 
-// Write complex data to arbitraty path
-Map<String, Object> map = [...]
+// Write complex data to arbitraty path.
+Map<String, Object> map = ...;
 vault.write("any/path/to/write", map);
 
-// Delete secret
+// Delete secret.
 vault.delete("any/path/to/write");
 ```
 
@@ -105,10 +106,11 @@ vault.delete("any/path/to/write");
 
 ```java
 // Create token using TokenBuilder
-Token token = new TokenBuilder().withId("token id")
-                                .withDisplayName("new test token")
-                                .withPolicies("pol1", "pol2")
-                                .build();
+Token token = Token.builder()
+                   .withId("token id")
+                   .withDisplayName("new test token")
+                   .withPolicies("pol1", "pol2")
+                   .build();
 vault.createToken(token);
 
 // Create AppRole credentials
@@ -122,11 +124,6 @@ AppRoleSecretResponse secret = vault.createAppRoleSecret("testrole");
 
 [JavaDoc API](http://jvault.stklcode.de/apidocs/)
 
-## Planned features
-
-* Creation and modification of policies
-* Implement more authentication methods
-
 ## License
 
 The project is licensed under [Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0).

assets/logo.svg

@@ -2,11 +2,11 @@
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
 <svg xmlns="http://www.w3.org/2000/svg" width="128" height="128">
     <path d="M4,12 l60,104 l60,-104 z" stroke="none" fill="#000000" />
-    <circle cx="78" cy="24" r="6" stroke="none" fill="#00a9c7" />
-    <circle cx="78" cy="38" r="6" stroke="none" fill="#00a9c7" />
-    <circle cx="78" cy="52" r="6" stroke="none" fill="#00a9c7" />
-    <circle cx="78" cy="66" r="6" stroke="none" fill="#00a9c7" />
-    <circle cx="72" cy="78" r="6" stroke="none" fill="#00a9c7" />
-    <circle cx="58" cy="78" r="6" stroke="none" fill="#00a9c7" />
-    <circle cx="52" cy="66" r="6" stroke="none" fill="#00a9c7" />
-</svg>
+    <rect x="74" y="20" width="8" height="8" stroke="none" fill="#00abe0" />
+    <rect x="74" y="34" width="8" height="8" stroke="none" fill="#00abe0" />
+    <rect x="74" y="48" width="8" height="8" stroke="none" fill="#00abe0" />
+    <rect x="74" y="62" width="8" height="8" stroke="none" fill="#00abe0" />
+    <rect x="68" y="74" width="8" height="8" stroke="none" fill="#00abe0" />
+    <rect x="54" y="74" width="8" height="8" stroke="none" fill="#00abe0" />
+    <rect x="48" y="62" width="8" height="8" stroke="none" fill="#00abe0" />
+</svg>

pom.xml

@@ -3,14 +3,15 @@
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>de.stklcode.jvault</groupId>
-    <artifactId>connector</artifactId>
-    <version>0.6.2</version>
+    <artifactId>jvault-connector</artifactId>
+    <version>0.8.1</version>
 
     <packaging>jar</packaging>
 
     <name>jVaultConnector</name>
     <description>Connector artifact for Hashicorp's Vault secret management</description>
     <url>https://jvault.stklcode.de</url>
+    <inceptionYear>2016</inceptionYear>
 
     <licenses>
         <license>
@@ -24,46 +25,110 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
+    <developers>
+        <developer>
+            <name>Stefan Kalscheuer</name>
+            <email>stefan@stklcode.de</email>
+            <timezone>+1</timezone>
+        </developer>
+    </developers>
+
+    <scm>
+        <connection>scm:git:git://github.com/stklcode/jvaultconnector.git</connection>
+        <developerConnection>scm:git:git@github.com:stklcode/jvaultconnector.git</developerConnection>
+        <url>https://github.com/stklcode/jvaultconnector</url>
+    </scm>
+
+    <issueManagement>
+        <system>GitHub Issues</system>
+        <url>https://github.com/stklcode/jvaultconnector/issues</url>
+    </issueManagement>
+
     <build>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.6.1</version>
+                <version>3.8.1</version>
                 <configuration>
                     <source>1.8</source>
                     <target>1.8</target>
                 </configuration>
             </plugin>
         </plugins>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-clean-plugin</artifactId>
+                    <version>3.1.0</version>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-resources-plugin</artifactId>
+                    <version>3.1.0</version>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-jar-plugin</artifactId>
+                    <version>3.1.2</version>
+                    <configuration>
+                        <archive>
+                            <manifestEntries>
+                                <Automatic-Module-Name>de.stklcode.jvault.connector</Automatic-Module-Name>
+                            </manifestEntries>
+                        </archive>
+                    </configuration>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-install-plugin</artifactId>
+                    <version>2.5.2</version>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-surefire-plugin</artifactId>
+                    <version>2.22.2</version>
+                    <configuration>
+                        <reuseForks>false</reuseForks>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
     </build>
 
     <dependencies>
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpcore</artifactId>
-            <version>4.4.6</version>
+            <version>4.4.11</version>
         </dependency>
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>
-            <version>4.5.3</version>
+            <version>4.5.9</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-core</artifactId>
-            <version>2.9.0</version>
+            <version>2.9.9</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>2.9.0</version>
+            <version>2.9.9.3</version>
         </dependency>
 
         <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.5.1</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-migrationsupport</artifactId>
+            <version>5.5.1</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -75,8 +140,97 @@
         <dependency>
             <groupId>com.github.stefanbirkner</groupId>
             <artifactId>system-rules</artifactId>
-            <version>1.16.1</version>
+            <version>1.17.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>3.0.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-inline</artifactId>
+            <version>3.0.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.6</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
+
+
+    <profiles>
+        <profile>
+            <id>sources</id>
+            <activation>
+                <activeByDefault>false</activeByDefault>
+            </activation>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-source-plugin</artifactId>
+                        <version>3.1.0</version>
+                        <executions>
+                            <execution>
+                                <id>attach-sources</id>
+                                <goals>
+                                    <goal>jar-no-fork</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+
+        <profile>
+            <id>javadoc</id>
+            <activation>
+                <activeByDefault>false</activeByDefault>
+            </activation>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-javadoc-plugin</artifactId>
+                        <version>3.1.1</version>
+                        <configuration>
+                            <source>1.8</source>
+                        </configuration>
+                        <executions>
+                            <execution>
+                                <id>attach-javadocs</id>
+                                <goals>
+                                    <goal>jar</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+
+        <profile>
+            <id>offline-tests</id>
+            <build>
+                <pluginManagement>
+                    <plugins>
+                        <plugin>
+                            <groupId>org.apache.maven.plugins</groupId>
+                            <artifactId>maven-surefire-plugin</artifactId>
+                            <configuration>
+                                <excludedGroups>online</excludedGroups>
+                            </configuration>
+                        </plugin>
+                    </plugins>
+                </pluginManagement>
+            </build>
+        </profile>
+    </profiles>
 </project>

src/main/java/de/stklcode/jvault/connector/VaultConnector.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,7 +21,11 @@ import de.stklcode.jvault.connector.exception.VaultConnectorException;
 import de.stklcode.jvault.connector.model.*;
 import de.stklcode.jvault.connector.model.response.*;
 
-import java.util.*;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 
 /**
  * Vault Connector interface.
@@ -30,7 +34,10 @@ import java.util.*;
  * @author Stefan Kalscheuer
  * @since 0.1
  */
-public interface VaultConnector extends AutoCloseable {
+public interface VaultConnector extends AutoCloseable, Serializable {
+    /**
+     * Default sub-path for Vault secrets.
+     */
     String PATH_SECRET = "secret";
 
     /**
@@ -42,35 +49,47 @@ public interface VaultConnector extends AutoCloseable {
      * Retrieve status of vault seal.
      *
      * @return Seal status
+     * @throws VaultConnectorException on error
      */
-    SealResponse sealStatus();
+    SealResponse sealStatus() throws VaultConnectorException;
 
     /**
      * Seal vault.
      *
-     * @return TRUE on success
+     * @throws VaultConnectorException on error
      */
-    boolean seal();
+    void seal() throws VaultConnectorException;
 
     /**
      * Unseal vault.
      *
      * @param key   A single master share key
      * @param reset Discard previously provided keys (optional)
-     * @return TRUE on success
+     * @return Response with seal status
+     * @throws VaultConnectorException on error
      */
-    SealResponse unseal(final String key, final Boolean reset);
+    SealResponse unseal(final String key, final Boolean reset) throws VaultConnectorException;
 
     /**
      * Unseal vault.
      *
      * @param key A single master share key
-     * @return TRUE on success
+     * @return Response with seal status
+     * @throws VaultConnectorException on error
      */
-    default SealResponse unseal(final String key) {
+    default SealResponse unseal(final String key) throws VaultConnectorException {
         return unseal(key, null);
     }
 
+    /**
+     * Query server health information.
+     *
+     * @return Health information.
+     * @throws VaultConnectorException on error
+     * @since 0.7.0
+     */
+    HealthResponse getHealth() throws VaultConnectorException;
+
     /**
      * Get all availale authentication backends.
      *
@@ -103,7 +122,7 @@ public interface VaultConnector extends AutoCloseable {
      *
      * @param appID  The App ID
      * @param userID The User ID
-     * @return TRUE on success
+     * @return The {@link AuthResponse}
      * @throws VaultConnectorException on error
      * @deprecated As of Vault 0.6.1 App-ID is superseded by AppRole. Consider using {@link #authAppRole} instead.
      */
@@ -114,7 +133,7 @@ public interface VaultConnector extends AutoCloseable {
      * Authorize to Vault using AppRole method without secret ID.
      *
      * @param roleID The role ID
-     * @return TRUE on success
+     * @return The {@link AuthResponse}
      * @throws VaultConnectorException on error
      * @since 0.4.0
      */
@@ -127,7 +146,7 @@ public interface VaultConnector extends AutoCloseable {
      *
      * @param roleID   The role ID
      * @param secretID The secret ID
-     * @return TRUE on success
+     * @return The {@link AuthResponse}
      * @throws VaultConnectorException on error
      * @since 0.4.0
      */
@@ -139,7 +158,7 @@ public interface VaultConnector extends AutoCloseable {
      * @param appID       The unique App-ID
      * @param policy      The policy to associate with
      * @param displayName Arbitrary name to display
-     * @return TRUE on success
+     * @return {@code true} on success
      * @throws VaultConnectorException on error
      * @deprecated As of Vault 0.6.1 App-ID is superseded by AppRole. Consider using {@link #createAppRole} instead.
      */
@@ -151,7 +170,7 @@ public interface VaultConnector extends AutoCloseable {
      * Register a new AppRole role from given metamodel.
      *
      * @param role The role
-     * @return TRUE on success
+     * @return {@code true} on success
      * @throws VaultConnectorException on error
      * @since 0.4.0
      */
@@ -161,7 +180,7 @@ public interface VaultConnector extends AutoCloseable {
      * Register new AppRole role with default policy.
      *
      * @param roleName The role name
-     * @return TRUE on success
+     * @return {@code true} on success
      * @throws VaultConnectorException on error
      * @since 0.4.0
      */
@@ -174,7 +193,7 @@ public interface VaultConnector extends AutoCloseable {
      *
      * @param roleName The role name
      * @param policies The policies to associate with
-     * @return TRUE on success
+     * @return {@code true} on success
      * @throws VaultConnectorException on error
      * @since 0.4.0
      */
@@ -187,7 +206,7 @@ public interface VaultConnector extends AutoCloseable {
      *
      * @param roleName The role name
      * @param roleID   A custom role ID
-     * @return TRUE on success
+     * @return {@code true} on success
      * @throws VaultConnectorException on error
      * @since 0.4.0
      */
@@ -201,7 +220,7 @@ public interface VaultConnector extends AutoCloseable {
      * @param roleName The role name
      * @param policies The policies to associate with
      * @param roleID   A custom role ID
-     * @return TRUE on success
+     * @return {@code true} on success
      * @throws VaultConnectorException on error
      * @since 0.4.0
      */
@@ -214,7 +233,7 @@ public interface VaultConnector extends AutoCloseable {
      * Delete AppRole role from Vault.
      *
      * @param roleName The role anme
-     * @return TRUE on succevss
+     * @return {@code true} on succevss
      * @throws VaultConnectorException on error
      */
     boolean deleteAppRole(final String roleName) throws VaultConnectorException;
@@ -244,7 +263,7 @@ public interface VaultConnector extends AutoCloseable {
      *
      * @param roleName The role name
      * @param roleID   The role ID
-     * @return TRUE on success
+     * @return {@code true} on success
      * @throws VaultConnectorException on error
      * @since 0.4.0
      */
@@ -319,19 +338,6 @@ public interface VaultConnector extends AutoCloseable {
      */
     List<String> listAppRoles() throws VaultConnectorException;
 
-    /**
-     * List existing (accessible) secret IDs for AppRole role.
-     *
-     * @param roleName The role name
-     * @return List of roles
-     * @throws VaultConnectorException on error
-     * @deprecated Use {@link #listAppRoleSecrets(String)}}. Will be removed in 0.7.0!
-     */
-    @Deprecated
-    default List<String> listAppRoleSecretss(final String roleName) throws VaultConnectorException {
-        return listAppRoleSecrets(roleName);
-    }
-
     /**
      * List existing (accessible) secret IDs for AppRole role.
      *
@@ -346,10 +352,10 @@ public interface VaultConnector extends AutoCloseable {
      *
      * @param appID  The App-ID
      * @param userID The User-ID
-     * @return TRUE on success
+     * @return {@code true} on success
      * @throws VaultConnectorException on error
      * @deprecated As of Vault 0.6.1 App-ID is superseded by AppRole.
-     *             Consider using {@link #createAppRoleSecret} instead.
+     * Consider using {@link #createAppRoleSecret} instead.
      */
     @Deprecated
     boolean registerUserId(final String appID, final String userID) throws VaultConnectorException;
@@ -361,7 +367,7 @@ public interface VaultConnector extends AutoCloseable {
      * @param policy      The policy to associate with
      * @param displayName Arbitrary name to display
      * @param userID      The User-ID
-     * @return TRUE on success
+     * @return {@code true} on success
      * @throws VaultConnectorException on error
      * @deprecated As of Vault 0.6.1 App-ID is superseded by AppRole.
      */
@@ -392,7 +398,8 @@ public interface VaultConnector extends AutoCloseable {
 
     /**
      * Retrieve secret from Vault.
-     * Prefix "secret/" is automatically added to key.
+     * <br>
+     * Prefix {@code secret/} is automatically added to key.
      *
      * @param key Secret identifier
      * @return Secret response
@@ -402,6 +409,176 @@ public interface VaultConnector extends AutoCloseable {
         return read(PATH_SECRET + "/" + key);
     }
 
+    /**
+     * Retrieve the latest secret data for specific version from Vault.
+     * <br>
+     * Prefix "secret/data" is automatically added to key.
+     * Only available for KV v2 secrets.
+     *
+     * @param key Secret identifier
+     * @return Secret response
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default SecretResponse readSecretData(final String key) throws VaultConnectorException {
+        return readSecretVersion(key, null);
+    }
+
+    /**
+     * Retrieve the latest secret data for specific version from Vault.
+     * <br>
+     * Path {@code <mount>/data/<key>} is read here.
+     * Only available for KV v2 secrets.
+     *
+     * @param mount Secret store mountpoint (without leading or trailing slash).
+     * @param key   Secret identifier
+     * @return Secret response
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default SecretResponse readSecretData(final String mount, final String key) throws VaultConnectorException {
+        return readSecretVersion(mount, key, null);
+    }
+
+    /**
+     * Write secret to Vault.
+     * <br>
+     * Prefix {@code secret/} is automatically added to path.
+     * Only available for KV v2 secrets.
+     *
+     * @param key Secret identifier.
+     * @param data Secret content. Value must be be JSON serializable.
+     * @return Metadata for the created/updated secret.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default SecretVersionResponse writeSecretData(final String key, final Map<String, Object> data) throws VaultConnectorException {
+        return writeSecretData(PATH_SECRET, key, data, null);
+    }
+
+    /**
+     * Write secret to Vault.
+     * <br>
+     * Path {@code <mount>/data/<key>} is written here.
+     * Only available for KV v2 secrets.
+     *
+     * @param mount Secret store mountpoint (without leading or trailing slash).
+     * @param key Secret identifier
+     * @param data Secret content. Value must be be JSON serializable.
+     * @return Metadata for the created/updated secret.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default SecretVersionResponse writeSecretData(final String mount, final String key, final Map<String, Object> data) throws VaultConnectorException {
+        return writeSecretData(mount, key, data, null);
+    }
+
+    /**
+     * Write secret to Vault.
+     * <br>
+     * Path {@code <mount>/data/<key>} is written here.
+     * Only available for KV v2 secrets.
+     *
+     * @param mount Secret store mountpoint (without leading or trailing slash).
+     * @param key Secret identifier
+     * @param data Secret content. Value must be be JSON serializable.
+     * @param cas  Use Check-And-Set operation, i.e. only allow writing if current version matches this value.
+     * @return Metadata for the created/updated secret.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    SecretVersionResponse writeSecretData(final String mount, final String key, final Map<String, Object> data, final Integer cas) throws VaultConnectorException;
+
+    /**
+     * Retrieve secret data from Vault.
+     * <br>
+     * Path {@code <mount>/data/<key>} is read here.
+     * Only available for KV v2 secrets.
+     *
+     * @param key     Secret identifier
+     * @param version Version to read. If {@code null} or zero, the latest version will be returned.
+     * @return Secret response
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default SecretResponse readSecretVersion(final String key, final Integer version) throws VaultConnectorException {
+        return readSecretVersion(PATH_SECRET, key, version);
+    }
+
+    /**
+     * Retrieve secret data from Vault.
+     * <br>
+     * Path {@code <mount>/data/<key>} is read here.
+     * Only available for KV v2 secrets.
+     *
+     * @param mount   Secret store mountpoint (without leading or trailing slash).
+     * @param key     Secret identifier
+     * @param version Version to read. If {@code null} or zero, the latest version will be returned.
+     * @return Secret responsef
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    SecretResponse readSecretVersion(final String mount, final String key, final Integer version) throws VaultConnectorException;
+
+    /**
+     * Retrieve secret metadata from Vault.
+     * Path {@code secret/metadata/<key>} is read here.
+     * Only available for KV v2 secrets.
+     *
+     * @param key Secret identifier
+     * @return Metadata response
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default MetadataResponse readSecretMetadata(final String key) throws VaultConnectorException {
+        return readSecretMetadata(PATH_SECRET, key);
+    }
+
+    /**
+     * Update secret metadata.
+     * <br>
+     * Path {@code secret/metadata/<key>} is read here.
+     * Only available for KV v2 secrets.
+     *
+     * @param key Secret identifier
+     * @param maxVersions Maximum number of versions (fallback to backend default if {@code null})
+     * @param casRequired Specify if Check-And-Set is required for this secret.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default void updateSecretMetadata(final String key, final Integer maxVersions, final boolean casRequired) throws VaultConnectorException {
+        updateSecretMetadata(PATH_SECRET, key, maxVersions, casRequired);
+    }
+
+    /**
+     * Retrieve secret metadata from Vault.
+     * <br>
+     * Path {@code <mount>/metadata/<key>} is read here.
+     * Only available for KV v2 secrets.
+     *
+     * @param mount Secret store mountpoint (without leading or trailing slash).
+     * @param key   Secret identifier
+     * @return Metadata response
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    MetadataResponse readSecretMetadata(final String mount, final String key) throws VaultConnectorException;
+
+    /**
+     * Update secret metadata.
+     * <br>
+     * Path {@code <mount>/metadata/<key>} is written here.
+     * Only available for KV v2 secrets.
+     *
+     * @param mount       Secret store mountpoint (without leading or trailing slash).
+     * @param key         Secret identifier
+     * @param maxVersions Maximum number of versions (fallback to backend default if {@code null})
+     * @param casRequired Specify if Check-And-Set is required for this secret.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    void updateSecretMetadata(final String mount, final String key, final Integer maxVersions, final boolean casRequired) throws VaultConnectorException;
+
     /**
      * List available nodes from Vault.
      *
@@ -414,7 +591,8 @@ public interface VaultConnector extends AutoCloseable {
 
     /**
      * List available secrets from Vault.
-     * Prefix "secret/" is automatically added to path.
+     * <br>
+     * Prefix {@code secret/} is automatically added to path.
      *
      * @param path Root path to search
      * @return List of secret keys
@@ -446,11 +624,25 @@ public interface VaultConnector extends AutoCloseable {
      * @throws VaultConnectorException on error
      * @since 0.5.0
      */
-    void write(final String key, final Map<String, Object> data) throws VaultConnectorException;
+    default void write(final String key, final Map<String, Object> data) throws VaultConnectorException {
+        write(key, data, null);
+    }
+
+    /**
+     * Write value to Vault.
+     *
+     * @param key     Secret path
+     * @param data    Secret content. Value must be be JSON serializable.
+     * @param options Secret options (optional).
+     * @throws VaultConnectorException on error
+     * @since 0.8 {@code options} parameter added
+     */
+    void write(final String key, final Map<String, Object> data, final Map<String, Object> options) throws VaultConnectorException;
 
     /**
      * Write secret to Vault.
-     * Prefix "secret/" is automatically added to path.
+     * <br>
+     * Prefix {@code secret/} is automatically added to path.
      *
      * @param key   Secret path
      * @param value Secret value
@@ -464,7 +656,8 @@ public interface VaultConnector extends AutoCloseable {
 
     /**
      * Write secret to Vault.
-     * Prefix "secret/" is automatically added to path.
+     * <br>
+     * Prefix {@code secret/} is automatically added to path.
      *
      * @param key  Secret path
      * @param data Secret content. Value must be be JSON serializable.
@@ -472,8 +665,9 @@ public interface VaultConnector extends AutoCloseable {
      * @since 0.5.0
      */
     default void writeSecret(final String key, final Map<String, Object> data) throws VaultConnectorException {
-        if (key == null || key.isEmpty())
+        if (key == null || key.isEmpty()) {
             throw new InvalidRequestException("Secret path must not be empty.");
+        }
         write(PATH_SECRET + "/" + key, data);
     }
 
@@ -488,7 +682,8 @@ public interface VaultConnector extends AutoCloseable {
 
     /**
      * Delete secret from Vault.
-     * Prefix "secret/" is automatically added to path.
+     * <br>
+     * Prefix {@code secret/} is automatically added to path.
      *
      * @param key Secret path
      * @throws VaultConnectorException on error
@@ -497,6 +692,135 @@ public interface VaultConnector extends AutoCloseable {
         delete(PATH_SECRET + "/" + key);
     }
 
+    /**
+     * Delete latest version of a secret from Vault.
+     * <br>
+     * Prefix {@code secret/} is automatically added to path. Only available for KV v2 stores.
+     *
+     * @param key Secret path.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default void deleteLatestSecretVersion(final String key) throws VaultConnectorException {
+        deleteLatestSecretVersion(PATH_SECRET, key);
+    }
+
+    /**
+     * Delete latest version of a secret from Vault.
+     * <br>
+     * Only available for KV v2 stores.
+     *
+     * @param mount Secret store mountpoint (without leading or trailing slash).
+     * @param key   Secret path.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    void deleteLatestSecretVersion(final String mount, final String key) throws VaultConnectorException;
+
+    /**
+     * Delete latest version of a secret from Vault.
+     * <br>
+     * Prefix {@code secret/} is automatically added to path.
+     * Only available for KV v2 stores.
+     *
+     * @param key Secret path.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default void deleteAllSecretVersions(final String key) throws VaultConnectorException {
+        deleteAllSecretVersions(PATH_SECRET, key);
+    }
+
+    /**
+     * Delete latest version of a secret from Vault.
+     * <br>
+     * Prefix {@code secret/} is automatically added to path.
+     * Only available for KV v2 stores.
+     *
+     * @param mount    Secret store mountpoint (without leading or trailing slash).
+     * @param key Secret path.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    void deleteAllSecretVersions(final String mount, final String key) throws VaultConnectorException;
+
+    /**
+     * Delete secret versions from Vault.
+     * <br>
+     * Only available for KV v2 stores.
+     *
+     * @param key      Secret path.
+     * @param versions Versions of the secret to delete.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default void deleteSecretVersions(final String key, final int... versions) throws VaultConnectorException {
+        deleteSecretVersions(PATH_SECRET, key, versions);
+    }
+
+    /**
+     * Delete secret versions from Vault.
+     * <br>
+     * Only available for KV v2 stores.
+     *
+     * @param mount    Secret store mountpoint (without leading or trailing slash).
+     * @param key      Secret path.
+     * @param versions Versions of the secret to delete.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    void deleteSecretVersions(final String mount, final String key, final int... versions) throws VaultConnectorException;
+
+    /**
+     * Undelete (restore) secret versions from Vault.
+     * Only available for KV v2 stores.
+     *
+     * @param key      Secret path.
+     * @param versions Versions of the secret to undelete.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default void undeleteSecretVersions(final String key, final int... versions) throws VaultConnectorException {
+        undeleteSecretVersions(PATH_SECRET, key, versions);
+    }
+
+    /**
+     * Undelete (restore) secret versions from Vault.
+     * Only available for KV v2 stores.
+     *
+     * @param mount    Secret store mountpoint (without leading or trailing slash).
+     * @param key      Secret path.
+     * @param versions Versions of the secret to undelete.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    void undeleteSecretVersions(final String mount, final String key, final int... versions) throws VaultConnectorException;
+
+    /**
+     * Destroy secret versions from Vault.
+     * Only available for KV v2 stores.
+     *
+     * @param key      Secret path.
+     * @param versions Versions of the secret to destroy.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    default void destroySecretVersions(final String key, final int... versions) throws VaultConnectorException {
+        destroySecretVersions(PATH_SECRET, key, versions);
+    }
+
+    /**
+     * Destroy secret versions from Vault.
+     * Only available for KV v2 stores.
+     *
+     * @param mount    Secret store mountpoint (without leading or trailing slash).
+     * @param key      Secret path.
+     * @param versions Versions of the secret to destroy.
+     * @throws VaultConnectorException on error
+     * @since 0.8
+     */
+    void destroySecretVersions(final String mount, final String key, final int... versions) throws VaultConnectorException;
+
     /**
      * Revoke given lease immediately.
      *
@@ -564,10 +888,12 @@ public interface VaultConnector extends AutoCloseable {
      */
     TokenResponse lookupToken(final String token) throws VaultConnectorException;
 
+
+
     /**
      * Read credentials for MySQL backend at default mount point.
      *
-     * @param role  the role name
+     * @param role the role name
      * @return the credentials response
      * @throws VaultConnectorException on error
      * @since 0.5.0
@@ -579,7 +905,7 @@ public interface VaultConnector extends AutoCloseable {
     /**
      * Read credentials for PostgreSQL backend at default mount point.
      *
-     * @param role  the role name
+     * @param role the role name
      * @return the credentials response
      * @throws VaultConnectorException on error
      * @since 0.5.0
@@ -591,7 +917,7 @@ public interface VaultConnector extends AutoCloseable {
     /**
      * Read credentials for MSSQL backend at default mount point.
      *
-     * @param role  the role name
+     * @param role the role name
      * @return the credentials response
      * @throws VaultConnectorException on error
      * @since 0.5.0
@@ -603,7 +929,7 @@ public interface VaultConnector extends AutoCloseable {
     /**
      * Read credentials for MSSQL backend at default mount point.
      *
-     * @param role  the role name
+     * @param role the role name
      * @return the credentials response
      * @throws VaultConnectorException on error
      * @since 0.5.0

src/main/java/de/stklcode/jvault/connector/builder/HTTPVaultConnectorBuilder.java

@@ -0,0 +1,298 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.builder;
+
+import de.stklcode.jvault.connector.HTTPVaultConnector;
+import de.stklcode.jvault.connector.exception.ConnectionException;
+import de.stklcode.jvault.connector.exception.TlsException;
+import de.stklcode.jvault.connector.exception.VaultConnectorException;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+
+/**
+ * Vault Connector Factory implementation for HTTP Vault connectors.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8.0
+ */
+public final class HTTPVaultConnectorBuilder implements VaultConnectorBuilder {
+    private static final String ENV_VAULT_ADDR = "VAULT_ADDR";
+    private static final String ENV_VAULT_CACERT = "VAULT_CACERT";
+    private static final String ENV_VAULT_TOKEN = "VAULT_TOKEN";
+    private static final String ENV_VAULT_MAX_RETRIES = "VAULT_MAX_RETRIES";
+
+    public static final String DEFAULT_HOST = "127.0.0.1";
+    public static final Integer DEFAULT_PORT = 8200;
+    public static final boolean DEFAULT_TLS = true;
+    public static final String DEFAULT_TLS_VERSION = "TLSv1.2";
+    public static final String DEFAULT_PREFIX = "/v1/";
+    public static final int DEFAULT_NUMBER_OF_RETRIES = 0;
+
+    private String host;
+    private Integer port;
+    private boolean tls;
+    private String tlsVersion;
+    private String prefix;
+    private X509Certificate trustedCA;
+    private int numberOfRetries;
+    private Integer timeout;
+    private String token;
+
+    /**
+     * Default empty constructor.
+     * Initializes factory with default values.
+     */
+    public HTTPVaultConnectorBuilder() {
+        host = DEFAULT_HOST;
+        port = DEFAULT_PORT;
+        tls = DEFAULT_TLS;
+        tlsVersion = DEFAULT_TLS_VERSION;
+        prefix = DEFAULT_PREFIX;
+        numberOfRetries = DEFAULT_NUMBER_OF_RETRIES;
+    }
+
+    /**
+     * Set hostname (default: 127.0.0.1).
+     *
+     * @param host Hostname or IP address
+     * @return self
+     */
+    public HTTPVaultConnectorBuilder withHost(final String host) {
+        this.host = host;
+        return this;
+    }
+
+    /**
+     * Set port (default: 8200).
+     *
+     * @param port Vault TCP port
+     * @return self
+     */
+    public HTTPVaultConnectorBuilder withPort(final Integer port) {
+        this.port = port;
+        return this;
+    }
+
+    /**
+     * Set TLS usage (default: TRUE).
+     *
+     * @param useTLS use TLS or not
+     * @return self
+     */
+    public HTTPVaultConnectorBuilder withTLS(final boolean useTLS) {
+        this.tls = useTLS;
+        return this;
+    }
+
+    /**
+     * Set TLS usage (default: TRUE).
+     *
+     * @param useTLS  Use TLS or not.
+     * @param version Supported TLS version ({@code TLSv1.2}, {@code TLSv1.1}, {@code TLSv1.0}, {@code TLS}).
+     * @return self
+     * @since 0.8 Added version parameter (#22).
+     */
+    public HTTPVaultConnectorBuilder withTLS(final boolean useTLS, final String version) {
+        this.tls = useTLS;
+        this.tlsVersion = version;
+        return this;
+    }
+
+    /**
+     * Convenience Method for TLS usage (enabled by default).
+     *
+     * @param version Supported TLS version ({@code TLSv1.2}, {@code TLSv1.1}, {@code TLSv1.0}, {@code TLS}).
+     * @return self
+     * @since 0.8 Added version parameter (#22).
+     */
+    public HTTPVaultConnectorBuilder withTLS(final String version) {
+        return withTLS(true, version);
+    }
+
+    /**
+     * Convenience Method for TLS usage (enabled by default).
+     *
+     * @return self
+     */
+    public HTTPVaultConnectorBuilder withTLS() {
+        return withTLS(true);
+    }
+
+    /**
+     * Convenience Method for NOT using TLS.
+     *
+     * @return self
+     */
+    public HTTPVaultConnectorBuilder withoutTLS() {
+        return withTLS(false);
+    }
+
+    /**
+     * Set API prefix. Default is "/v1/" and changes should not be necessary for current state of development.
+     *
+     * @param prefix Vault API prefix (default: "/v1/"
+     * @return self
+     */
+    public HTTPVaultConnectorBuilder withPrefix(final String prefix) {
+        this.prefix = prefix;
+        return this;
+    }
+
+    /**
+     * Add a trusted CA certifiate for HTTPS connections.
+     *
+     * @param cert path to certificate file
+     * @return self
+     * @throws VaultConnectorException on error
+     * @since 0.4.0
+     */
+    public HTTPVaultConnectorBuilder withTrustedCA(final Path cert) throws VaultConnectorException {
+        if (cert != null) {
+            return withTrustedCA(certificateFromFile(cert));
+        } else {
+            this.trustedCA = null;
+        }
+        return this;
+    }
+
+    /**
+     * Add a trusted CA certifiate for HTTPS connections.
+     *
+     * @param cert path to certificate file
+     * @return self
+     * @since 0.8.0
+     */
+    public HTTPVaultConnectorBuilder withTrustedCA(final X509Certificate cert) {
+        this.trustedCA = cert;
+        return this;
+    }
+
+    /**
+     * Set token for automatic authentication, using {@link #buildAndAuth()}.
+     *
+     * @param token Vault token
+     * @return self
+     * @since 0.6.0
+     */
+    public HTTPVaultConnectorBuilder withToken(final String token) {
+        this.token = token;
+        return this;
+    }
+
+    /**
+     * Build connector based on the {@code }VAULT_ADDR} and {@code VAULT_CACERT} (optional) environment variables.
+     *
+     * @return self
+     * @throws VaultConnectorException if Vault address from environment variables is malformed
+     * @since 0.6.0
+     */
+    public HTTPVaultConnectorBuilder fromEnv() throws VaultConnectorException {
+        /* Parse URL from environment variable */
+        if (System.getenv(ENV_VAULT_ADDR) != null && !System.getenv(ENV_VAULT_ADDR).trim().isEmpty()) {
+            try {
+                URL url = new URL(System.getenv(ENV_VAULT_ADDR));
+                this.host = url.getHost();
+                this.port = url.getPort();
+                this.tls = url.getProtocol().equals("https");
+            } catch (MalformedURLException e) {
+                throw new ConnectionException("URL provided in environment variable malformed", e);
+            }
+        }
+
+        /* Read number of retries */
+        if (System.getenv(ENV_VAULT_MAX_RETRIES) != null) {
+            try {
+                numberOfRetries = Integer.parseInt(System.getenv(ENV_VAULT_MAX_RETRIES));
+            } catch (NumberFormatException ignored) {
+                /* Ignore malformed values. */
+            }
+        }
+
+        /* Read token */
+        token = System.getenv(ENV_VAULT_TOKEN);
+
+        /* Parse certificate, if set */
+        if (System.getenv(ENV_VAULT_CACERT) != null && !System.getenv(ENV_VAULT_CACERT).trim().isEmpty()) {
+            return withTrustedCA(Paths.get(System.getenv(ENV_VAULT_CACERT)));
+        }
+        return this;
+    }
+
+    /**
+     * Define the number of retries to attempt on 5xx errors.
+     *
+     * @param numberOfRetries The number of retries to attempt on 5xx errors (default: 0)
+     * @return self
+     * @since 0.6.0
+     */
+    public HTTPVaultConnectorBuilder withNumberOfRetries(final int numberOfRetries) {
+        this.numberOfRetries = numberOfRetries;
+        return this;
+    }
+
+    /**
+     * Define a custom timeout for the HTTP connection.
+     *
+     * @param milliseconds Timeout value in milliseconds.
+     * @return self
+     * @since 0.6.0
+     */
+    public HTTPVaultConnectorBuilder withTimeout(final int milliseconds) {
+        this.timeout = milliseconds;
+        return this;
+    }
+
+    @Override
+    public HTTPVaultConnector build() {
+        return new HTTPVaultConnector(host, tls, tlsVersion, port, prefix, trustedCA, numberOfRetries, timeout);
+    }
+
+    @Override
+    public HTTPVaultConnector buildAndAuth() throws VaultConnectorException {
+        if (token == null) {
+            throw new ConnectionException("No vault token provided, unable to authenticate.");
+        }
+        HTTPVaultConnector con = build();
+        con.authToken(token);
+        return con;
+    }
+
+    /**
+     * Read given certificate file to X.509 certificate.
+     *
+     * @param certFile Path to certificate file
+     * @return X.509 Certificate object
+     * @throws TlsException on error
+     * @since 0.4.0
+     */
+    private X509Certificate certificateFromFile(final Path certFile) throws TlsException {
+        try (InputStream is = Files.newInputStream(certFile)) {
+            return (X509Certificate) CertificateFactory.getInstance("X.509").generateCertificate(is);
+        } catch (IOException | CertificateException e) {
+            throw new TlsException("Unable to read certificate.", e);
+        }
+    }
+}

src/main/java/de/stklcode/jvault/connector/builder/VaultConnectorBuilder.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.builder;
+
+import de.stklcode.jvault.connector.VaultConnector;
+import de.stklcode.jvault.connector.exception.VaultConnectorException;
+
+/**
+ * Abstract Vault Connector Builder interface.
+ * Provides builder style for Vault connectors.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8.0
+ */
+public interface VaultConnectorBuilder {
+    /**
+     * Get Factory implementation for HTTP Vault Connector.
+     *
+     * @return HTTP Connector Factory
+     */
+    static HTTPVaultConnectorBuilder http() {
+        return new HTTPVaultConnectorBuilder();
+    }
+
+    /**
+     * Build command, produces connector after initialization.
+     *
+     * @return Vault Connector instance.
+     */
+    VaultConnector build();
+
+    /**
+     * Build connector and authenticate with token set in factory or from environment.
+     *
+     * @return Authenticated Vault connector instance.
+     * @throws VaultConnectorException if authentication failed
+     * @since 0.6.0
+     */
+    VaultConnector buildAndAuth() throws VaultConnectorException;
+}

src/main/java/de/stklcode/jvault/connector/builder/package-info.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This package contains the {@link de.stklcode.jvault.connector.builder.VaultConnectorBuilder} to initialize a
+ * connector instance.
+ */
+package de.stklcode.jvault.connector.builder;

src/main/java/de/stklcode/jvault/connector/exception/AuthorizationRequiredException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/exception/ConnectionException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/exception/InvalidRequestException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/exception/InvalidResponseException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,7 +38,7 @@ public final class InvalidResponseException extends VaultConnectorException {
     /**
      * Constructs a new exception with the specified detail message.
      *
-     * @param message the detail message
+     * @param message The detail message
      */
     public InvalidResponseException(final String message) {
         super(message);
@@ -49,7 +49,7 @@ public final class InvalidResponseException extends VaultConnectorException {
     /**
      * Constructs a new exception with the specified cause.
      *
-     * @param cause the cause
+     * @param cause The cause
      */
     public InvalidResponseException(final Throwable cause) {
         super(cause);
@@ -60,8 +60,8 @@ public final class InvalidResponseException extends VaultConnectorException {
     /**
      * Constructs a new exception with the specified detail message and cause.
      *
-     * @param message the detail message
-     * @param cause   the cause
+     * @param message The detail message
+     * @param cause   The cause
      */
     public InvalidResponseException(final String message, final Throwable cause) {
         super(message, cause);
@@ -74,8 +74,8 @@ public final class InvalidResponseException extends VaultConnectorException {
      * <p>
      * The HTTP status code can be retrieved by {@link #getStatusCode()} later.
      *
-     * @param message    the detail message
-     * @param statusCode status code of the HTTP response
+     * @param message    The detail message
+     * @param statusCode Status code of the HTTP response
      * @since 0.6.2
      */
     public InvalidResponseException(final String message, final Integer statusCode) {
@@ -89,9 +89,9 @@ public final class InvalidResponseException extends VaultConnectorException {
      * <p>
      * The HTTP status code can be retrieved by {@link #getStatusCode()} later.
      *
-     * @param message    the detail message
-     * @param statusCode status code of the HTTP response
-     * @param cause      the cause
+     * @param message    The detail message
+     * @param statusCode Status code of the HTTP response
+     * @param cause      The cause
      * @since 0.6.2
      */
     public InvalidResponseException(final String message, final Integer statusCode, final Throwable cause) {
@@ -103,8 +103,8 @@ public final class InvalidResponseException extends VaultConnectorException {
      * <p>
      * The HTTP status code can be retrieved by {@link #getStatusCode()} later.
      *
-     * @param message    the detail message
-     * @param statusCode status code of the HTTP response
+     * @param message    The detail message
+     * @param statusCode Status code of the HTTP response
      * @param response   HTTP response string
      * @since 0.6.2
      */
@@ -121,10 +121,10 @@ public final class InvalidResponseException extends VaultConnectorException {
      * <p>
      * The HTTP status code can be retrieved by {@link #getStatusCode()} later.
      *
-     * @param message    the detail message
-     * @param statusCode status code of the HTTP response
+     * @param message    The detail message
+     * @param statusCode Status code of the HTTP response
      * @param response   HTTP response string
-     * @param cause      the cause
+     * @param cause      The cause
      * @since 0.6.2
      */
     public InvalidResponseException(final String message,
@@ -139,7 +139,7 @@ public final class InvalidResponseException extends VaultConnectorException {
     /**
      * Specify the HTTP status code. Can be retrieved by {@link #getStatusCode()} later.
      *
-     * @param statusCode the status code
+     * @param statusCode The status code
      * @return self
      * @deprecated as of 0.6.2, use constructor with status code argument instead
      */
@@ -151,7 +151,7 @@ public final class InvalidResponseException extends VaultConnectorException {
     /**
      * Specify the response string. Can be retrieved by {@link #getResponse()} later.
      *
-     * @param response response text
+     * @param response Response text
      * @return self
      * @deprecated use constructor with response argument instead
      */
@@ -163,7 +163,7 @@ public final class InvalidResponseException extends VaultConnectorException {
     /**
      * Retrieve the HTTP status code.
      *
-     * @return the status code or {@code null} if none specified.
+     * @return The status code or {@code null} if none specified.
      */
     public Integer getStatusCode() {
         return statusCode;
@@ -172,7 +172,7 @@ public final class InvalidResponseException extends VaultConnectorException {
     /**
      * Retrieve the response text.
      *
-     * @return the response text or {@code null} if none specified.
+     * @return The response text or {@code null} if none specified.
      */
     public String getResponse() {
         return response;

src/main/java/de/stklcode/jvault/connector/exception/PermissionDeniedException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/exception/TlsException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/exception/VaultConnectorException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/exception/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Some custom exceptions for error handling.
+ */
+package de.stklcode.jvault.connector.exception;

src/main/java/de/stklcode/jvault/connector/factory/HTTPVaultConnectorFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,23 +17,11 @@
 package de.stklcode.jvault.connector.factory;
 
 import de.stklcode.jvault.connector.HTTPVaultConnector;
-import de.stklcode.jvault.connector.exception.ConnectionException;
-import de.stklcode.jvault.connector.exception.TlsException;
+import de.stklcode.jvault.connector.builder.HTTPVaultConnectorBuilder;
 import de.stklcode.jvault.connector.exception.VaultConnectorException;
 
 import javax.net.ssl.SSLContext;
-import javax.net.ssl.TrustManager;
-import javax.net.ssl.TrustManagerFactory;
-import java.io.IOException;
-import java.io.InputStream;
-import java.net.MalformedURLException;
-import java.net.URL;
-import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.Paths;
-import java.security.*;
-import java.security.cert.CertificateException;
-import java.security.cert.CertificateFactory;
 import java.security.cert.X509Certificate;
 
 /**
@@ -41,38 +29,19 @@ import java.security.cert.X509Certificate;
  *
  * @author Stefan Kalscheuer
  * @since 0.1
+ * @deprecated As of 0.8.0 please refer to {@link de.stklcode.jvault.connector.builder.HTTPVaultConnectorBuilder} with identical API.
  */
+@Deprecated
 public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
-    private static final String ENV_VAULT_ADDR = "VAULT_ADDR";
-    private static final String ENV_VAULT_CACERT = "VAULT_CACERT";
-    private static final String ENV_VAULT_TOKEN = "VAULT_TOKEN";
-    private static final String ENV_VAULT_MAX_RETRIES = "VAULT_MAX_RETRIES";
 
-    public static final String DEFAULT_HOST = "127.0.0.1";
-    public static final Integer DEFAULT_PORT = 8200;
-    public static final boolean DEFAULT_TLS = true;
-    public static final String DEFAULT_PREFIX = "/v1/";
-    public static final int DEFAULT_NUMBER_OF_RETRIES = 0;
-
-    private String host;
-    private Integer port;
-    private boolean tls;
-    private String prefix;
-    private SSLContext sslContext;
-    private int numberOfRetries;
-    private Integer timeout;
-    private String token;
+    private final HTTPVaultConnectorBuilder delegate;
 
     /**
      * Default empty constructor.
      * Initializes factory with default values.
      */
     public HTTPVaultConnectorFactory() {
-        host = DEFAULT_HOST;
-        port = DEFAULT_PORT;
-        tls = DEFAULT_TLS;
-        prefix = DEFAULT_PREFIX;
-        numberOfRetries = DEFAULT_NUMBER_OF_RETRIES;
+        delegate = new HTTPVaultConnectorBuilder();
     }
 
     /**
@@ -82,7 +51,7 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @return self
      */
     public HTTPVaultConnectorFactory withHost(final String host) {
-        this.host = host;
+        delegate.withHost(host);
         return this;
     }
 
@@ -93,7 +62,7 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @return self
      */
     public HTTPVaultConnectorFactory withPort(final Integer port) {
-        this.port = port;
+        delegate.withPort(port);
         return this;
     }
 
@@ -104,7 +73,7 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @return self
      */
     public HTTPVaultConnectorFactory withTLS(final boolean useTLS) {
-        this.tls = useTLS;
+        delegate.withTLS(useTLS);
         return this;
     }
 
@@ -133,7 +102,7 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @return self
      */
     public HTTPVaultConnectorFactory withPrefix(final String prefix) {
-        this.prefix = prefix;
+        delegate.withPrefix(prefix);
         return this;
     }
 
@@ -146,8 +115,19 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @since 0.4.0
      */
     public HTTPVaultConnectorFactory withTrustedCA(final Path cert) throws VaultConnectorException {
-        if (cert != null)
-            return withSslContext(createSslContext(cert));
+        delegate.withTrustedCA(cert);
+        return this;
+    }
+
+    /**
+     * Add a trusted CA certifiate for HTTPS connections.
+     *
+     * @param cert path to certificate file
+     * @return self
+     * @since 0.8.0
+     */
+    public HTTPVaultConnectorFactory withTrustedCA(final X509Certificate cert) {
+        delegate.withTrustedCA(cert);
         return this;
     }
 
@@ -158,10 +138,10 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @param sslContext the SSL context
      * @return self
      * @since 0.4.0
+     * @deprecated As of 0.8.0 this is no longer supported, please use {@link #withTrustedCA(Path)} or {@link #withTrustedCA(X509Certificate)}.
      */
     public HTTPVaultConnectorFactory withSslContext(final SSLContext sslContext) {
-        this.sslContext = sslContext;
-        return this;
+        throw new UnsupportedOperationException("Use of deprecated method, please switch to withTrustedCA()");
     }
 
     /**
@@ -172,7 +152,7 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @since 0.6.0
      */
     public HTTPVaultConnectorFactory withToken(final String token) {
-        this.token = token;
+        delegate.withToken(token);
         return this;
     }
 
@@ -184,33 +164,7 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @since 0.6.0
      */
     public HTTPVaultConnectorFactory fromEnv() throws VaultConnectorException {
-        /* Parse URL from environment variable */
-        if (System.getenv(ENV_VAULT_ADDR) != null && !System.getenv(ENV_VAULT_ADDR).trim().isEmpty()) {
-            try {
-                URL url = new URL(System.getenv(ENV_VAULT_ADDR));
-                this.host = url.getHost();
-                this.port = url.getPort();
-                this.tls = url.getProtocol().equals("https");
-            } catch (MalformedURLException e) {
-                throw new ConnectionException("URL provided in environment variable malformed", e);
-            }
-        }
-
-        /* Read number of retries */
-        if (System.getenv(ENV_VAULT_MAX_RETRIES) != null) {
-            try {
-                numberOfRetries = Integer.parseInt(System.getenv(ENV_VAULT_MAX_RETRIES));
-            } catch (NumberFormatException ignored) {
-            }
-        }
-
-        /* Read token */
-        token = System.getenv(ENV_VAULT_TOKEN);
-
-        /* Parse certificate, if set */
-        if (System.getenv(ENV_VAULT_CACERT) != null && !System.getenv(ENV_VAULT_CACERT).trim().isEmpty()) {
-            return withTrustedCA(Paths.get(System.getenv(ENV_VAULT_CACERT)));
-        }
+        delegate.fromEnv();
         return this;
     }
 
@@ -222,7 +176,7 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @since 0.6.0
      */
     public HTTPVaultConnectorFactory withNumberOfRetries(final int numberOfRetries) {
-        this.numberOfRetries = numberOfRetries;
+        delegate.withNumberOfRetries(numberOfRetries);
         return this;
     }
 
@@ -234,78 +188,17 @@ public final class HTTPVaultConnectorFactory extends VaultConnectorFactory {
      * @since 0.6.0
      */
     public HTTPVaultConnectorFactory withTimeout(final int milliseconds) {
-        this.timeout = milliseconds;
+        delegate.withTimeout(milliseconds);
         return this;
     }
 
     @Override
     public HTTPVaultConnector build() {
-        return new HTTPVaultConnector(host, tls, port, prefix, sslContext, numberOfRetries, timeout);
+        return delegate.build();
     }
 
     @Override
     public HTTPVaultConnector buildAndAuth() throws VaultConnectorException {
-        if (token == null)
-            throw new ConnectionException("No vault token provided, unable to authenticate.");
-        HTTPVaultConnector con = new HTTPVaultConnector(host, tls, port, prefix, sslContext, numberOfRetries, timeout);
-        con.authToken(token);
-        return con;
-    }
-
-    /**
-     * Create SSL Context trusting only provided certificate.
-     *
-     * @param trustedCert Path to trusted CA certificate
-     * @return SSL context
-     * @throws TlsException on errors
-     * @since 0.4.0
-     */
-    private SSLContext createSslContext(final Path trustedCert) throws TlsException {
-        try {
-            SSLContext context = SSLContext.getInstance("TLS");
-            context.init(null, createTrustManager(trustedCert), new SecureRandom());
-            return context;
-        } catch (NoSuchAlgorithmException | KeyManagementException e) {
-            throw new TlsException("Unable to intialize SSLContext", e);
-        }
-    }
-
-    /**
-     * Create a custom TrustManager for given CA certificate file.
-     *
-     * @param trustedCert Path to trusted CA certificate
-     * @return TrustManger
-     * @throws TlsException on error
-     * @since 0.4.0
-     */
-    private TrustManager[] createTrustManager(final Path trustedCert) throws TlsException {
-        try {
-            /* Create Keystore with trusted certificate */
-            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
-            keyStore.load(null, null);
-            keyStore.setCertificateEntry("trustedCert", certificateFromFile(trustedCert));
-            /* Initialize TrustManager */
-            TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
-            tmf.init(keyStore);
-            return tmf.getTrustManagers();
-        } catch (KeyStoreException | NoSuchAlgorithmException | CertificateException | IOException e) {
-            throw new TlsException("Unable to initialize TrustManager", e);
-        }
-    }
-
-    /**
-     * Read given certificate file to X.509 certificate.
-     *
-     * @param certFile Path to certificate file
-     * @return X.509 Certificate object
-     * @throws TlsException on error
-     * @since 0.4.0
-     */
-    private X509Certificate certificateFromFile(final Path certFile) throws TlsException {
-        try (InputStream is = Files.newInputStream(certFile)) {
-            return (X509Certificate) CertificateFactory.getInstance("X.509").generateCertificate(is);
-        } catch (IOException | CertificateException e) {
-            throw new TlsException("Unable to read certificate.", e);
-        }
+        return delegate.buildAndAuth();
     }
 }

src/main/java/de/stklcode/jvault/connector/factory/VaultConnectorFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,7 @@
 
 package de.stklcode.jvault.connector.factory;
 
-import de.stklcode.jvault.connector.VaultConnector;
-import de.stklcode.jvault.connector.exception.VaultConnectorException;
+import de.stklcode.jvault.connector.builder.VaultConnectorBuilder;
 
 /**
  * Abstract Vault Connector Factory interface.
@@ -25,30 +24,19 @@ import de.stklcode.jvault.connector.exception.VaultConnectorException;
  *
  * @author Stefan Kalscheuer
  * @since 0.1
+ * @deprecated As of 0.8.0 please refer to {@link VaultConnectorBuilder} with identical API.
  */
-public abstract class VaultConnectorFactory {
+@Deprecated
+public abstract class VaultConnectorFactory implements VaultConnectorBuilder {
     /**
      * Get Factory implementation for HTTP Vault Connector.
      *
      * @return HTTP Connector Factory
+     * @deprecated As of 0.8.0 please refer to {@link VaultConnectorBuilder#http()}.
      */
+    @Deprecated
     public static HTTPVaultConnectorFactory httpFactory() {
         return new HTTPVaultConnectorFactory();
     }
 
-    /**
-     * Build command, produces connector after initialization.
-     *
-     * @return Vault Connector instance.
-     */
-    public abstract VaultConnector build();
-
-    /**
-     * Build connector and authenticate with token set in factory or from environment.
-     *
-     * @return Authenticated Vault connector instance.
-     * @throws VaultConnectorException if authentication failed
-     * @since 0.6.0
-     */
-    public abstract VaultConnector buildAndAuth() throws VaultConnectorException;
 }

src/main/java/de/stklcode/jvault/connector/factory/package-info.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This package contains the {@link de.stklcode.jvault.connector.factory.VaultConnectorFactory} to initialize a
+ * connector instance.
+ *
+ * @deprecated As of v0.8.0 please refer to {@link de.stklcode.jvault.connector.builder}.
+ */
+package de.stklcode.jvault.connector.factory;

src/main/java/de/stklcode/jvault/connector/internal/Error.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.internal;
+
+/**
+ * Utility class to bundle common error messages.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8 Extracted from static inner class.
+ */
+final class Error {
+    static final String READ_RESPONSE = "Unable to read response";
+    static final String PARSE_RESPONSE = "Unable to parse response";
+    static final String UNEXPECTED_RESPONSE = "Received response where none was expected";
+    static final String URI_FORMAT = "Invalid URI format";
+    static final String RESPONSE_CODE = "Invalid response code";
+    static final String INIT_SSL_CONTEXT = "Unable to intialize SSLContext";
+
+    /**
+     * Constructor hidden, this class should not be instantiated.
+     */
+    private Error() {
+    }
+}

src/main/java/de/stklcode/jvault/connector/internal/RequestHelper.java

@@ -0,0 +1,433 @@
+package de.stklcode.jvault.connector.internal;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stklcode.jvault.connector.exception.*;
+import de.stklcode.jvault.connector.model.response.ErrorResponse;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.config.RequestConfig;
+import org.apache.http.client.methods.*;
+import org.apache.http.client.utils.URIBuilder;
+import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
+import org.apache.http.entity.StringEntity;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.util.EntityUtils;
+
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.TrustManagerFactory;
+import java.io.*;
+import java.net.URISyntaxException;
+import java.nio.charset.StandardCharsets;
+import java.security.*;
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+ * Helper class to bundle Vault HTTP requests.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8 Extracted methods from {@link de.stklcode.jvault.connector.HTTPVaultConnector}.
+ */
+public final class RequestHelper implements Serializable {
+    private static final String HEADER_VAULT_TOKEN = "X-Vault-Token";
+
+    private final String baseURL;                   // Base URL of Vault.
+    private final Integer timeout;                  // Timeout in milliseconds.
+    private final int retries;                      // Number of retries on 5xx errors.
+    private final String tlsVersion;                // TLS version (#22).
+    private final X509Certificate trustedCaCert;    // Trusted CA certificate.
+    private final ObjectMapper jsonMapper;
+
+    /**
+     * Constructor of the request helper.
+     *
+     * @param baseURL       The URL
+     * @param retries       Number of retries on 5xx errors
+     * @param timeout       Timeout for HTTP requests (milliseconds)
+     * @param tlsVersion    TLS Version.
+     * @param trustedCaCert Trusted CA certificate
+     */
+    public RequestHelper(final String baseURL,
+                         final int retries,
+                         final Integer timeout,
+                         final String tlsVersion,
+                         final X509Certificate trustedCaCert) {
+        this.baseURL = baseURL;
+        this.retries = retries;
+        this.timeout = timeout;
+        this.tlsVersion = tlsVersion;
+        this.trustedCaCert = trustedCaCert;
+        this.jsonMapper = new ObjectMapper();
+    }
+
+    /**
+     * Execute HTTP request using POST method.
+     *
+     * @param path    URL path (relative to base).
+     * @param payload Map of payload values (will be converted to JSON).
+     * @param token   Vault token (may be {@code null}).
+     * @return HTTP response
+     * @throws VaultConnectorException on connection error
+     * @since 0.8 Added {@code token} parameter.
+     */
+    public String post(final String path, final Object payload, final String token) throws VaultConnectorException {
+        /* Initialize post */
+        HttpPost post = new HttpPost(baseURL + path);
+
+        /* generate JSON from payload */
+        StringEntity input;
+        try {
+            input = new StringEntity(jsonMapper.writeValueAsString(payload), StandardCharsets.UTF_8);
+        } catch (JsonProcessingException e) {
+            throw new InvalidRequestException(Error.PARSE_RESPONSE, e);
+        }
+        input.setContentEncoding("UTF-8");
+        input.setContentType("application/json");
+        post.setEntity(input);
+
+        /* Set X-Vault-Token header */
+        if (token != null) {
+            post.addHeader(HEADER_VAULT_TOKEN, token);
+        }
+
+        return request(post, retries);
+    }
+
+    /**
+     * Execute HTTP request using POST method and parse JSON result.
+     *
+     * @param path    URL path (relative to base).
+     * @param payload Map of payload values (will be converted to JSON).
+     * @param token   Vault token (may be {@code null}).
+     * @param target  Target class.
+     * @param <T>     Target type.
+     * @return HTTP response
+     * @throws VaultConnectorException on connection error
+     * @since 0.8
+     */
+    public <T> T post(final String path, final Object payload, final String token, final Class<T> target)
+            throws VaultConnectorException {
+        try {
+            String response = post(path, payload, token);
+            return jsonMapper.readValue(response, target);
+        } catch (IOException e) {
+            throw new InvalidResponseException(Error.PARSE_RESPONSE, e);
+        }
+    }
+
+    /**
+     * Execute HTTP request using POST method and expect empty (204) response.
+     *
+     * @param path    URL path (relative to base).
+     * @param payload Map of payload values (will be converted to JSON).
+     * @param token   Vault token (may be {@code null}).
+     * @throws VaultConnectorException on connection error
+     * @since 0.8
+     */
+    public void postWithoutResponse(final String path, final Object payload, final String token) throws VaultConnectorException {
+        if (!post(path, payload, token).isEmpty()) {
+            throw new InvalidResponseException(Error.UNEXPECTED_RESPONSE);
+        }
+    }
+
+    /**
+     * Execute HTTP request using PUT method.
+     *
+     * @param path    URL path (relative to base).
+     * @param payload Map of payload values (will be converted to JSON).
+     * @param token   Vault token (may be {@code null}).
+     * @return HTTP response
+     * @throws VaultConnectorException on connection error
+     * @since 0.8 Added {@code token} parameter.
+     */
+    public String put(final String path, final Map<String, String> payload, final String token) throws VaultConnectorException {
+        /* Initialize put */
+        HttpPut put = new HttpPut(baseURL + path);
+
+        /* generate JSON from payload */
+        StringEntity entity = null;
+        try {
+            entity = new StringEntity(jsonMapper.writeValueAsString(payload));
+        } catch (UnsupportedEncodingException | JsonProcessingException e) {
+            throw new InvalidRequestException("Payload serialization failed", e);
+        }
+
+        /* Parse parameters */
+        put.setEntity(entity);
+
+        /* Set X-Vault-Token header */
+        if (token != null) {
+            put.addHeader(HEADER_VAULT_TOKEN, token);
+        }
+
+        return request(put, retries);
+    }
+
+    /**
+     * Execute HTTP request using PUT method and parse JSON result.
+     *
+     * @param path    URL path (relative to base).
+     * @param payload Map of payload values (will be converted to JSON).
+     * @param token   Vault token (may be {@code null}).
+     * @param target  Target class.
+     * @param <T>     Target type.
+     * @return HTTP response
+     * @throws VaultConnectorException on connection error
+     * @since 0.8
+     */
+    public <T> T put(final String path, final Map<String, String> payload, final String token, final Class<T> target)
+            throws VaultConnectorException {
+        try {
+            String response = put(path, payload, token);
+            return jsonMapper.readValue(response, target);
+        } catch (IOException e) {
+            throw new InvalidResponseException(Error.PARSE_RESPONSE, e);
+        }
+    }
+
+    /**
+     * Execute HTTP request using PUT method and expect empty (204) response.
+     *
+     * @param path    URL path (relative to base).
+     * @param payload Map of payload values (will be converted to JSON).
+     * @param token   Vault token (may be {@code null}).
+     * @throws VaultConnectorException on connection error
+     * @since 0.8
+     */
+    public void putWithoutResponse(final String path, final Map<String, String> payload, final String token)
+            throws VaultConnectorException {
+        if (!put(path, payload, token).isEmpty()) {
+            throw new InvalidResponseException(Error.UNEXPECTED_RESPONSE);
+        }
+    }
+
+    /**
+     * Execute HTTP request using DELETE method.
+     *
+     * @param path  URL path (relative to base).
+     * @param token Vault token (may be {@code null}).
+     * @return HTTP response
+     * @throws VaultConnectorException on connection error
+     * @since 0.8 Added {@code token} parameter.
+     */
+    public String delete(final String path, final String token) throws VaultConnectorException {
+        /* Initialize delete */
+        HttpDelete delete = new HttpDelete(baseURL + path);
+
+        /* Set X-Vault-Token header */
+        if (token != null) {
+            delete.addHeader(HEADER_VAULT_TOKEN, token);
+        }
+
+        return request(delete, retries);
+    }
+
+    /**
+     * Execute HTTP request using DELETE method and expect empty (204) response.
+     *
+     * @param path  URL path (relative to base).
+     * @param token Vault token (may be {@code null}).
+     * @throws VaultConnectorException on connection error
+     * @since 0.8
+     */
+    public void deleteWithoutResponse(final String path, final String token) throws VaultConnectorException {
+        if (!delete(path, token).isEmpty()) {
+            throw new InvalidResponseException(Error.UNEXPECTED_RESPONSE);
+        }
+    }
+
+    /**
+     * Execute HTTP request using GET method.
+     *
+     * @param path    URL path (relative to base).
+     * @param payload Map of payload values (will be converted to JSON).
+     * @param token   Vault token (may be {@code null}).
+     * @return HTTP response
+     * @throws VaultConnectorException on connection error
+     * @since 0.8 Added {@code token} parameter.
+     */
+    public String get(final String path, final Map<String, String> payload, final String token)
+            throws VaultConnectorException {
+        HttpGet get;
+        try {
+            /* Add parameters to URI */
+            URIBuilder uriBuilder = new URIBuilder(baseURL + path);
+            payload.forEach(uriBuilder::addParameter);
+
+            /* Initialize request */
+            get = new HttpGet(uriBuilder.build());
+        } catch (URISyntaxException e) {
+            /* this should never occur and may leak sensible information */
+            throw new InvalidRequestException(Error.URI_FORMAT);
+        }
+
+        /* Set X-Vault-Token header */
+        if (token != null) {
+            get.addHeader(HEADER_VAULT_TOKEN, token);
+        }
+
+        return request(get, retries);
+    }
+
+    /**
+     * Execute HTTP request using GET method and parse JSON result to target class.
+     *
+     * @param path    URL path (relative to base).
+     * @param payload Map of payload values (will be converted to JSON).
+     * @param token   Vault token (may be {@code null}).
+     * @param target  Target class.
+     * @param <T>     Target type.
+     * @return HTTP response
+     * @throws VaultConnectorException on connection error
+     * @since 0.8
+     */
+    public <T> T get(final String path, final Map<String, String> payload, final String token, final Class<T> target)
+            throws VaultConnectorException {
+        try {
+            String response = get(path, payload, token);
+            return jsonMapper.readValue(response, target);
+        } catch (IOException e) {
+            throw new InvalidResponseException(Error.PARSE_RESPONSE, e);
+        }
+    }
+
+    /**
+     * Execute prepared HTTP request and return result.
+     *
+     * @param base    Prepares Request
+     * @param retries number of retries
+     * @return HTTP response
+     * @throws VaultConnectorException on connection error
+     */
+    private String request(final HttpRequestBase base, final int retries) throws VaultConnectorException {
+        /* Set JSON Header */
+        base.addHeader("accept", "application/json");
+
+        CloseableHttpResponse response = null;
+
+        try (CloseableHttpClient httpClient = HttpClientBuilder.create()
+                .setSSLSocketFactory(createSSLSocketFactory())
+                .build()) {
+            /* Set custom timeout, if defined */
+            if (this.timeout != null) {
+                base.setConfig(RequestConfig.copy(RequestConfig.DEFAULT).setConnectTimeout(timeout).build());
+            }
+
+            /* Execute request */
+            response = httpClient.execute(base);
+
+            /* Check if response is valid */
+            if (response == null) {
+                throw new InvalidResponseException("Response unavailable");
+            }
+
+            switch (response.getStatusLine().getStatusCode()) {
+                case 200:
+                    return handleResult(response);
+                case 204:
+                    return "";
+                case 403:
+                    throw new PermissionDeniedException();
+                default:
+                    if (response.getStatusLine().getStatusCode() >= 500
+                            && response.getStatusLine().getStatusCode() < 600 && retries > 0) {
+                        /* Retry on 5xx errors */
+                        return request(base, retries - 1);
+                    } else {
+                        /* Fail on different error code and/or no retries left */
+                        handleError(response);
+
+                        /* Throw exception withoud details, if response entity is empty. */
+                        throw new InvalidResponseException(Error.RESPONSE_CODE,
+                                response.getStatusLine().getStatusCode());
+                    }
+            }
+        } catch (IOException e) {
+            throw new InvalidResponseException(Error.READ_RESPONSE, e);
+        } finally {
+            if (response != null && response.getEntity() != null) {
+                try {
+                    EntityUtils.consume(response.getEntity());
+                } catch (IOException ignored) {
+                    // Exception ignored.
+                }
+            }
+        }
+    }
+
+    /**
+     * Create a custom socket factory from trusted CA certificate.
+     *
+     * @return The factory.
+     * @throws TlsException An error occured during initialization of the SSL context.
+     * @since 0.8.0
+     */
+    private SSLConnectionSocketFactory createSSLSocketFactory() throws TlsException {
+        try {
+            // Create Keystore with trusted certificate.
+            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
+            keyStore.load(null, null);
+            keyStore.setCertificateEntry("trustedCert", trustedCaCert);
+
+            // Initialize TrustManager.
+            TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
+            tmf.init(keyStore);
+
+            // Create context usint this TrustManager.
+            SSLContext context = SSLContext.getInstance(tlsVersion);
+            context.init(null, tmf.getTrustManagers(), new SecureRandom());
+
+            return new SSLConnectionSocketFactory(
+                    context,
+                    null,
+                    null,
+                    SSLConnectionSocketFactory.getDefaultHostnameVerifier()
+            );
+        } catch (CertificateException | NoSuchAlgorithmException | KeyStoreException | IOException | KeyManagementException e) {
+            throw new TlsException(Error.INIT_SSL_CONTEXT, e);
+        }
+    }
+
+    /**
+     * Handle successful result.
+     *
+     * @param response The raw HTTP response (assuming status code 200)
+     * @return Complete response body as String
+     * @throws InvalidResponseException on reading errors
+     */
+    private String handleResult(final HttpResponse response) throws InvalidResponseException {
+        try (BufferedReader br = new BufferedReader(
+                new InputStreamReader(response.getEntity().getContent()))) {
+            return br.lines().collect(Collectors.joining("\n"));
+        } catch (IOException ignored) {
+            throw new InvalidResponseException(Error.READ_RESPONSE, 200);
+        }
+    }
+
+    /**
+     * Handle unsuccessful response. Throw detailed exception if possible.
+     *
+     * @param response The raw HTTP response (assuming status code 5xx)
+     * @throws VaultConnectorException Expected exception with details to throw
+     */
+    private void handleError(final HttpResponse response) throws VaultConnectorException {
+        if (response.getEntity() != null) {
+            try (BufferedReader br = new BufferedReader(
+                    new InputStreamReader(response.getEntity().getContent()))) {
+                String responseString = br.lines().collect(Collectors.joining("\n"));
+                ErrorResponse er = jsonMapper.readValue(responseString, ErrorResponse.class);
+                /* Check for "permission denied" response */
+                if (!er.getErrors().isEmpty() && er.getErrors().get(0).equals("permission denied")) {
+                    throw new PermissionDeniedException();
+                }
+                throw new InvalidResponseException(Error.RESPONSE_CODE,
+                        response.getStatusLine().getStatusCode(), er.toString());
+            } catch (IOException ignored) {
+                // Exception ignored.
+            }
+        }
+    }
+}

src/main/java/de/stklcode/jvault/connector/model/AppRole.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,6 +28,17 @@ import java.util.List;
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
 public final class AppRole {
+    /**
+     * Get {@link AppRoleBuilder} instance.
+     *
+     * @param name Role name.
+     * @return AppRole Builder.
+     * @since 0.8
+     */
+    public static AppRoleBuilder builder(final String name) {
+        return new AppRoleBuilder(name);
+    }
+
     @JsonProperty("role_name")
     private String name;
 
@@ -41,6 +52,8 @@ public final class AppRole {
 
     private List<String> boundCidrList;
 
+    private List<String> secretIdBoundCidrs;
+
     private List<String> policies;
 
     @JsonProperty("secret_id_num_uses")
@@ -73,24 +86,57 @@ public final class AppRole {
     /**
      * Construct complete {@link AppRole} object.
      *
-     * @param name            Role name (required)
-     * @param id              Role ID (optional)
-     * @param bindSecretId    Bind secret ID (optional)
-     * @param boundCidrList   Whitelist of subnets in CIDR notation (optional)
-     * @param policies        List of policies (optional)
-     * @param secretIdNumUses Maximum number of uses per secret (optional)
-     * @param secretIdTtl     Maximum TTL in seconds for secrets (optional)
-     * @param tokenTtl        Token TTL in seconds (optional)
-     * @param tokenMaxTtl     Maximum token TTL in seconds, including renewals (optional)
-     * @param period          Duration in seconds, if set the token is a periodic token (optional)
+     * @param name               Role name (required)
+     * @param id                 Role ID (optional)
+     * @param bindSecretId       Bind secret ID (optional)
+     * @param secretIdBoundCidrs Whitelist of subnets in CIDR notation (optional)
+     * @param policies           List of policies (optional)
+     * @param secretIdNumUses    Maximum number of uses per secret (optional)
+     * @param secretIdTtl        Maximum TTL in seconds for secrets (optional)
+     * @param tokenTtl           Token TTL in seconds (optional)
+     * @param tokenMaxTtl        Maximum token TTL in seconds, including renewals (optional)
+     * @param period             Duration in seconds, if set the token is a periodic token (optional)
      */
-    public AppRole(final String name, final String id, final Boolean bindSecretId, final List<String> boundCidrList,
+    public AppRole(final String name, final String id, final Boolean bindSecretId, final List<String> secretIdBoundCidrs,
                    final List<String> policies, final Integer secretIdNumUses, final Integer secretIdTtl,
                    final Integer tokenTtl, final Integer tokenMaxTtl, final Integer period) {
         this.name = name;
         this.id = id;
         this.bindSecretId = bindSecretId;
+        this.secretIdBoundCidrs = secretIdBoundCidrs;
+        this.policies = policies;
+        this.secretIdNumUses = secretIdNumUses;
+        this.secretIdTtl = secretIdTtl;
+        this.tokenTtl = tokenTtl;
+        this.tokenMaxTtl = tokenMaxTtl;
+        this.period = period;
+    }
+
+    /**
+     * Construct complete {@link AppRole} object.
+     * <p>
+     * This constructor is used for transition from {@code bound_cidr_list} to {@code secret_id_bound_cidrs} only.
+     *
+     * @param name               Role name (required)
+     * @param id                 Role ID (optional)
+     * @param bindSecretId       Bind secret ID (optional)
+     * @param boundCidrList      Whitelist of subnets in CIDR notation (optional)
+     * @param secretIdBoundCidrs Whitelist of subnets in CIDR notation (optional)
+     * @param policies           List of policies (optional)
+     * @param secretIdNumUses    Maximum number of uses per secret (optional)
+     * @param secretIdTtl        Maximum TTL in seconds for secrets (optional)
+     * @param tokenTtl           Token TTL in seconds (optional)
+     * @param tokenMaxTtl        Maximum token TTL in seconds, including renewals (optional)
+     * @param period             Duration in seconds, if set the token is a periodic token (optional)
+     */
+    AppRole(final String name, final String id, final Boolean bindSecretId, final List<String> boundCidrList,
+            final List<String> secretIdBoundCidrs, final List<String> policies, final Integer secretIdNumUses,
+            final Integer secretIdTtl, final Integer tokenTtl, final Integer tokenMaxTtl, final Integer period) {
+        this.name = name;
+        this.id = id;
+        this.bindSecretId = bindSecretId;
         this.boundCidrList = boundCidrList;
+        this.secretIdBoundCidrs = secretIdBoundCidrs;
         this.policies = policies;
         this.secretIdNumUses = secretIdNumUses;
         this.secretIdTtl = secretIdTtl;
@@ -122,14 +168,18 @@ public final class AppRole {
 
     /**
      * @return list of bound CIDR subnets
+     * @deprecated Use {@link #getSecretIdBoundCidrs()} instead, as this parameter is deprecated in Vault.
      */
+    @Deprecated
     public List<String> getBoundCidrList() {
         return boundCidrList;
     }
 
     /**
      * @param boundCidrList list of subnets in CIDR notation to bind role to
+     * @deprecated Use {@link #setSecretIdBoundCidrs(List)} instead, as this parameter is deprecated in Vault.
      */
+    @Deprecated
     @JsonSetter("bound_cidr_list")
     public void setBoundCidrList(final List<String> boundCidrList) {
         this.boundCidrList = boundCidrList;
@@ -137,15 +187,48 @@ public final class AppRole {
 
     /**
      * @return list of subnets in CIDR notation as comma-separated {@link String}
+     * @deprecated Use {@link #getSecretIdBoundCidrsString()} instead, as this parameter is deprecated in Vault.
      */
+    @Deprecated
     @JsonGetter("bound_cidr_list")
     @JsonInclude(JsonInclude.Include.NON_EMPTY)
     public String getBoundCidrListString() {
-        if (boundCidrList == null || boundCidrList.isEmpty())
+        if (boundCidrList == null || boundCidrList.isEmpty()) {
             return "";
+        }
         return String.join(",", boundCidrList);
     }
 
+    /**
+     * @return list of bound CIDR subnets
+     * @since 0.8 replaces {@link #getBoundCidrList()}
+     */
+    public List<String> getSecretIdBoundCidrs() {
+        return secretIdBoundCidrs;
+    }
+
+    /**
+     * @param secretIdBoundCidrs List of subnets in CIDR notation to bind secrets of this role to.
+     * @since 0.8 replaces {@link #setBoundCidrList(List)}
+     */
+    @JsonSetter("secret_id_bound_cidrs")
+    public void setSecretIdBoundCidrs(final List<String> secretIdBoundCidrs) {
+        this.secretIdBoundCidrs = secretIdBoundCidrs;
+    }
+
+    /**
+     * @return List of subnets in CIDR notation as comma-separated {@link String}
+     * @since 0.8 replaces {@link #getBoundCidrListString()} ()}
+     */
+    @JsonGetter("secret_id_bound_cidrs")
+    @JsonInclude(JsonInclude.Include.NON_EMPTY)
+    public String getSecretIdBoundCidrsString() {
+        if (secretIdBoundCidrs == null || secretIdBoundCidrs.isEmpty()) {
+            return "";
+        }
+        return String.join(",", secretIdBoundCidrs);
+    }
+
     /**
      * @return list of policies
      */
@@ -167,8 +250,9 @@ public final class AppRole {
     @JsonGetter("policies")
     @JsonInclude(JsonInclude.Include.NON_EMPTY)
     public String getPoliciesString() {
-        if (policies == null || policies.isEmpty())
+        if (policies == null || policies.isEmpty()) {
             return "";
+        }
         return String.join(",", policies);
     }
 

src/main/java/de/stklcode/jvault/connector/model/AppRoleBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,6 +30,7 @@ public final class AppRoleBuilder {
     private String id;
     private Boolean bindSecretId;
     private List<String> boundCidrList;
+    private List<String> secretIdBoundCidrs;
     private List<String> policies;
     private Integer secretIdNumUses;
     private Integer secretIdTtl;
@@ -93,12 +94,26 @@ public final class AppRoleBuilder {
      *
      * @param boundCidrList List of CIDR blocks which can perform login
      * @return self
+     * @deprecated Use {@link #withSecretIdBoundCidrs(List)} instead, as this parameter is deprecated in Vault.
      */
+    @Deprecated
     public AppRoleBuilder withBoundCidrList(final List<String> boundCidrList) {
         this.boundCidrList = boundCidrList;
         return this;
     }
 
+    /**
+     * Set bound CIDR blocks.
+     *
+     * @param secretIdBoundCidrs List of CIDR blocks which can perform login
+     * @return self
+     * @since 0.8 replaces {@link #withBoundCidrList(List)}
+     */
+    public AppRoleBuilder withSecretIdBoundCidrs(final List<String> secretIdBoundCidrs) {
+        this.secretIdBoundCidrs = secretIdBoundCidrs;
+        return this;
+    }
+
     /**
      * Add a CIDR block to list of bound blocks.
      *
@@ -106,9 +121,15 @@ public final class AppRoleBuilder {
      * @return self
      */
     public AppRoleBuilder withCidrBlock(final String cidrBlock) {
-        if (boundCidrList == null)
+        if (boundCidrList == null) {
             boundCidrList = new ArrayList<>();
+        }
         boundCidrList.add(cidrBlock);
+
+        if (secretIdBoundCidrs == null) {
+            secretIdBoundCidrs = new ArrayList<>();
+        }
+        secretIdBoundCidrs.add(cidrBlock);
         return this;
     }
 
@@ -119,8 +140,9 @@ public final class AppRoleBuilder {
      * @return self
      */
     public AppRoleBuilder withPolicies(final List<String> policies) {
-        if (this.policies == null)
+        if (this.policies == null) {
             this.policies = new ArrayList<>();
+        }
         this.policies.addAll(policies);
         return this;
     }
@@ -132,8 +154,9 @@ public final class AppRoleBuilder {
      * @return self
      */
     public AppRoleBuilder withPolicy(final String policy) {
-        if (this.policies == null)
+        if (this.policies == null) {
             this.policies = new ArrayList<>();
+        }
         policies.add(policy);
         return this;
     }
@@ -204,6 +227,7 @@ public final class AppRoleBuilder {
                 id,
                 bindSecretId,
                 boundCidrList,
+                secretIdBoundCidrs,
                 policies,
                 secretIdNumUses,
                 secretIdTtl,

src/main/java/de/stklcode/jvault/connector/model/AppRoleSecret.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -126,8 +126,9 @@ public final class AppRoleSecret {
      */
     @JsonGetter("cidr_list")
     public String getCidrListString() {
-        if (cidrList == null || cidrList.isEmpty())
+        if (cidrList == null || cidrList.isEmpty()) {
             return "";
+        }
         return String.join(",", cidrList);
     }
 

src/main/java/de/stklcode/jvault/connector/model/AuthBackend.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -48,9 +48,11 @@ public enum AuthBackend {
      * @return Auth backend value
      */
     public static AuthBackend forType(final String type) {
-        for (AuthBackend v : values())
-            if (v.type.equalsIgnoreCase(type))
+        for (AuthBackend v : values()) {
+            if (v.type.equalsIgnoreCase(type)) {
                 return v;
+            }
+        }
         return UNKNOWN;
     }
 }

src/main/java/de/stklcode/jvault/connector/model/Token.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,6 +31,16 @@ import java.util.Map;
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
 public final class Token {
+    /**
+     * Get {@link TokenBuilder} instance.
+     *
+     * @return Token Builder.
+     * @since 0.8
+     */
+    public static TokenBuilder builder() {
+        return new TokenBuilder();
+    }
+
     @JsonProperty("id")
     @JsonInclude(JsonInclude.Include.NON_NULL)
     private String id;

src/main/java/de/stklcode/jvault/connector/model/TokenBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -159,8 +159,9 @@ public final class TokenBuilder {
      * @return self
      */
     public TokenBuilder withPolicies(final List<String> policies) {
-        if (this.policies == null)
+        if (this.policies == null) {
             this.policies = new ArrayList<>();
+        }
         this.policies.addAll(policies);
         return this;
     }
@@ -172,8 +173,9 @@ public final class TokenBuilder {
      * @return self
      */
     public TokenBuilder withPolicy(final String policy) {
-        if (this.policies == null)
+        if (this.policies == null) {
             this.policies = new ArrayList<>();
+        }
         policies.add(policy);
         return this;
     }
@@ -185,8 +187,9 @@ public final class TokenBuilder {
      * @return self
      */
     public TokenBuilder withMeta(final Map<String, String> meta) {
-        if (this.meta == null)
+        if (this.meta == null) {
             this.meta = new HashMap<>();
+        }
         this.meta.putAll(meta);
         return this;
     }
@@ -199,8 +202,9 @@ public final class TokenBuilder {
      * @return self
      */
     public TokenBuilder withMeta(final String key, final String value) {
-        if (this.meta == null)
+        if (this.meta == null) {
             this.meta = new HashMap<>();
+        }
         this.meta.put(key, value);
         return this;
     }

src/main/java/de/stklcode/jvault/connector/model/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Model classes for communication with the Vault API.
+ */
+package de.stklcode.jvault.connector.model;

src/main/java/de/stklcode/jvault/connector/model/response/AppRoleResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,7 +42,9 @@ public final class AppRoleResponse extends VaultDataResponse {
             /* null empty strings on list objects */
             Map<String, Object> filteredData = new HashMap<>();
             data.forEach((k, v) -> {
-                if (!(v instanceof String && ((String) v).isEmpty())) filteredData.put(k, v);
+                if (!(v instanceof String && ((String) v).isEmpty())) {
+                    filteredData.put(k, v);
+                }
             });
             this.role = mapper.readValue(mapper.writeValueAsString(filteredData), AppRole.class);
         } catch (IOException e) {

src/main/java/de/stklcode/jvault/connector/model/response/AppRoleSecretResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,7 +42,9 @@ public final class AppRoleSecretResponse extends VaultDataResponse {
             /* null empty strings on list objects */
             Map<String, Object> filteredData = new HashMap<>();
             data.forEach((k, v) -> {
-                if (!(v instanceof String && ((String) v).isEmpty())) filteredData.put(k, v);
+                if (!(v instanceof String && ((String) v).isEmpty())) {
+                    filteredData.put(k, v);
+                }
             });
             this.secret = mapper.readValue(mapper.writeValueAsString(filteredData), AppRoleSecret.class);
         } catch (IOException e) {

src/main/java/de/stklcode/jvault/connector/model/response/AuthMethodsResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/AuthResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/CredentialsResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,8 +32,9 @@ public final class CredentialsResponse extends SecretResponse {
      */
     public String getUsername() {
         Object username = get("username");
-        if (username != null)
+        if (username != null) {
             return username.toString();
+        }
         return null;
     }
 
@@ -42,8 +43,9 @@ public final class CredentialsResponse extends SecretResponse {
      */
     public String getPassword() {
         Object password = get("password");
-        if (password != null)
+        if (password != null) {
             return password.toString();
+        }
         return null;
     }
 }

src/main/java/de/stklcode/jvault/connector/model/response/ErrorResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,4 +38,13 @@ public final class ErrorResponse implements VaultResponse {
     public List<String> getErrors() {
         return errors;
     }
+
+    @Override
+    public String toString() {
+        if (errors == null || errors.isEmpty()) {
+            return "error response";
+        } else {
+            return errors.get(0);
+        }
+    }
 }

src/main/java/de/stklcode/jvault/connector/model/response/HealthResponse.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Vault response for health query.
+ *
+ * @author  Stefan Kalscheuer
+ * @since   0.7.0
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public final class HealthResponse implements VaultResponse {
+    @JsonProperty("cluster_id")
+    private String clusterID;
+
+    @JsonProperty("cluster_name")
+    private String clusterName;
+
+    @JsonProperty("version")
+    private String version;
+
+    @JsonProperty("server_time_utc")
+    private Long serverTimeUTC;
+
+    @JsonProperty("standby")
+    private Boolean standby;
+
+    @JsonProperty("sealed")
+    private Boolean sealed;
+
+    @JsonProperty("initialized")
+    private Boolean initialized;
+
+    @JsonProperty("replication_perf_mode")
+    private String replicationPerfMode;
+
+    @JsonProperty("replication_dr_mode")
+    private String replicationDrMode;
+
+    @JsonProperty("performance_standby")
+    private Boolean performanceStandby;
+
+    /**
+     * @return The Cluster ID.
+     */
+    public String getClusterID() {
+        return clusterID;
+    }
+
+    /**
+     * @return The Cluster name.
+     */
+    public String getClusterName() {
+        return clusterName;
+    }
+
+    /**
+     * @return Vault version.
+     */
+    public String getVersion() {
+        return version;
+    }
+
+    /**
+     * @return Server time UTC (timestamp).
+     */
+    public Long getServerTimeUTC() {
+        return serverTimeUTC;
+    }
+
+    /**
+     * @return Server standby status.
+     */
+    public Boolean isStandby() {
+        return standby;
+    }
+
+    /**
+     * @return Server seal status.
+     */
+    public Boolean isSealed() {
+        return sealed;
+    }
+
+    /**
+     * @return Server initialization status.
+     */
+    public Boolean isInitialized() {
+        return initialized;
+    }
+
+    /**
+     * @return Replication performance mode of the active node (since Vault 0.9.2).
+     * @since 0.8 (#21)
+     */
+    public String getReplicationPerfMode() {
+        return replicationPerfMode;
+    }
+
+    /**
+     * @return Replication DR mode of the active node (since Vault 0.9.2).
+     * @since 0.8 (#21)
+     */
+    public String getReplicationDrMode() {
+        return replicationDrMode;
+    }
+
+    /**
+     * @return Performance standby status.
+     * @since 0.8 (#21)
+     */
+    public Boolean isPerformanceStandby() {
+        return performanceStandby;
+    }
+}

src/main/java/de/stklcode/jvault/connector/model/response/HelpResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/MetadataResponse.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stklcode.jvault.connector.exception.InvalidResponseException;
+import de.stklcode.jvault.connector.model.response.embedded.SecretMetadata;
+
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * Vault response for secret metadata (KV v2).
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class MetadataResponse extends VaultDataResponse {
+
+    private SecretMetadata metadata;
+
+    @Override
+    public final void setData(final Map<String, Object> data) throws InvalidResponseException {
+        ObjectMapper mapper = new ObjectMapper();
+        try {
+            this.metadata = mapper.readValue(mapper.writeValueAsString(data), SecretMetadata.class);
+        } catch (IOException e) {
+            throw new InvalidResponseException("Failed deserializing response", e);
+        }
+    }
+
+    /**
+     * Get the actual metadata.
+     *
+     * @return Metadata.
+     */
+    public SecretMetadata getMetadata() {
+        return metadata;
+    }
+}

src/main/java/de/stklcode/jvault/connector/model/response/RawDataResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/SealResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,14 +22,20 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 /**
  * Vault response for seal status or unseal request.
  *
- * @author  Stefan Kalscheuer
- * @since   0.1
+ * @author Stefan Kalscheuer
+ * @since 0.1
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
 public final class SealResponse implements VaultResponse {
+    @JsonProperty("type")
+    private String type;
+
     @JsonProperty("sealed")
     private boolean sealed;
 
+    @JsonProperty("initialized")
+    private boolean initialized;
+
     @JsonProperty("t")
     private Integer threshold;
 
@@ -39,6 +45,26 @@ public final class SealResponse implements VaultResponse {
     @JsonProperty("progress")
     private Integer progress;
 
+    @JsonProperty("version")
+    private String version;
+
+    @JsonProperty("nonce")
+    private String nonce;
+
+    @JsonProperty("cluster_name")
+    private String clusterName;
+
+    @JsonProperty("cluster_id")
+    private String clusterId;
+
+    /**
+     * @return Seal type.
+     * @since 0.8
+     */
+    public String getType() {
+        return type;
+    }
+
     /**
      * @return Seal status
      */
@@ -46,6 +72,14 @@ public final class SealResponse implements VaultResponse {
         return sealed;
     }
 
+    /**
+     * @return Vault initialization status (since Vault 0.11.2).
+     * @since 0.8
+     */
+    public boolean isInitialized() {
+        return initialized;
+    }
+
     /**
      * @return Required threshold of secret shares
      */
@@ -66,4 +100,36 @@ public final class SealResponse implements VaultResponse {
     public Integer getProgress() {
         return progress;
     }
+
+    /**
+     * @return Vault version.
+     * @since 0.8
+     */
+    public String getVersion() {
+        return version;
+    }
+
+    /**
+     * @return A random nonce.
+     * @since 0.8
+     */
+    public String getNonce() {
+        return nonce;
+    }
+
+    /**
+     * @return Vault cluster name (only if unsealed).
+     * @since 0.8
+     */
+    public String getClusterName() {
+        return clusterName;
+    }
+
+    /**
+     * @return Vault cluster ID (only if unsealed).
+     * @since 0.8
+     */
+    public String getClusterId() {
+        return clusterId;
+    }
 }

src/main/java/de/stklcode/jvault/connector/model/response/SecretListResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/SecretResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@ package de.stklcode.jvault.connector.model.response;
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import de.stklcode.jvault.connector.exception.InvalidResponseException;
+import de.stklcode.jvault.connector.model.response.embedded.VersionMetadata;
 
 import java.io.IOException;
 import java.util.HashMap;
@@ -32,11 +33,29 @@ import java.util.Map;
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
 public class SecretResponse extends VaultDataResponse {
+    private static final String KEY_DATA = "data";
+    private static final String KEY_METADATA = "metadata";
+
     private Map<String, Object> data;
+    private VersionMetadata metadata;
 
     @Override
     public final void setData(final Map<String, Object> data) throws InvalidResponseException {
-        this.data = data;
+        if (data.size() == 2
+                && data.containsKey(KEY_DATA) && data.get(KEY_DATA) instanceof Map
+                && data.containsKey(KEY_METADATA) && data.get(KEY_METADATA) instanceof Map) {
+            ObjectMapper mapper = new ObjectMapper();
+            try {
+                // This is apparently a KV v2 value.
+                this.data = (Map<String, Object>) data.get(KEY_DATA);
+                this.metadata = mapper.readValue(mapper.writeValueAsString(data.get(KEY_METADATA)), VersionMetadata.class);
+            } catch (ClassCastException | IOException e) {
+                throw new InvalidResponseException("Failed deserializing response", e);
+            }
+        } else {
+            // For KV v1 without metadata just store the data map.
+            this.data = data;
+        }
     }
 
     /**
@@ -46,11 +65,22 @@ public class SecretResponse extends VaultDataResponse {
      * @since 0.4.0
      */
     public final Map<String, Object> getData() {
-        if (data == null)
+        if (data == null) {
             return new HashMap<>();
+        }
         return data;
     }
 
+    /**
+     * Get secret metadata. This is only available for KV v2 secrets.
+     *
+     * @return Metadata of the secret.
+     * @since 0.8
+     */
+    public final VersionMetadata getMetadata() {
+        return metadata;
+    }
+
     /**
      * Get a single value for given key.
      *
@@ -59,8 +89,9 @@ public class SecretResponse extends VaultDataResponse {
      * @since 0.4.0
      */
     public final Object get(final String key) {
-        if (data == null)
+        if (data == null) {
             return null;
+        }
         return getData().get(key);
     }
 
@@ -74,8 +105,9 @@ public class SecretResponse extends VaultDataResponse {
     @Deprecated
     public final String getValue() {
         Object value = get("value");
-        if (value == null)
+        if (value == null) {
             return null;
+        }
         return value.toString();
     }
 
@@ -97,7 +129,7 @@ public class SecretResponse extends VaultDataResponse {
     /**
      * Get response parsed as JSON.
      *
-     * @param key the key
+     * @param key  the key
      * @param type Class to parse response
      * @param <T>  Class to parse response
      * @return Parsed object or {@code null} if absent
@@ -107,8 +139,9 @@ public class SecretResponse extends VaultDataResponse {
     public final <T> T get(final String key, final Class<T> type) throws InvalidResponseException {
         try {
             Object rawValue = get(key);
-            if (rawValue == null)
+            if (rawValue == null) {
                 return null;
+            }
             return new ObjectMapper().readValue(rawValue.toString(), type);
         } catch (IOException e) {
             throw new InvalidResponseException("Unable to parse response payload: " + e.getMessage());

src/main/java/de/stklcode/jvault/connector/model/response/SecretVersionResponse.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stklcode.jvault.connector.exception.InvalidResponseException;
+import de.stklcode.jvault.connector.model.response.embedded.VersionMetadata;
+
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * Vault response for a single secret version metatada, i.e. after update (KV v2).
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class SecretVersionResponse extends VaultDataResponse {
+
+    private VersionMetadata metadata;
+
+    @Override
+    public final void setData(final Map<String, Object> data) throws InvalidResponseException {
+        ObjectMapper mapper = new ObjectMapper();
+        try {
+            this.metadata = mapper.readValue(mapper.writeValueAsString(data), VersionMetadata.class);
+        } catch (IOException e) {
+            throw new InvalidResponseException("Failed deserializing response", e);
+        }
+    }
+
+    /**
+     * Get the actual metadata.
+     *
+     * @return Metadata.
+     */
+    public VersionMetadata getMetadata() {
+        return metadata;
+    }
+}

src/main/java/de/stklcode/jvault/connector/model/response/TokenResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/VaultDataResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/VaultResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/embedded/AuthData.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/embedded/AuthMethod.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/embedded/SecretMetadata.java

@@ -0,0 +1,127 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response.embedded;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeParseException;
+import java.util.Map;
+
+/**
+ * Embedded metadata for Key-Value v2 secrets.
+ *
+ * @author  Stefan Kalscheuer
+ * @since   0.8
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public final class SecretMetadata {
+    private static final DateTimeFormatter TIME_FORMAT = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSSSSSSSX");
+
+    @JsonProperty("created_time")
+    private String createdTimeString;
+
+    @JsonProperty("current_version")
+    private Integer currentVersion;
+
+    @JsonProperty("max_versions")
+    private Integer maxVersions;
+
+    @JsonProperty("oldest_version")
+    private Integer oldestVersion;
+
+    @JsonProperty("updated_time")
+    private String updatedTime;
+
+    @JsonProperty("versions")
+    private Map<Integer, VersionMetadata> versions;
+
+    /**
+     * @return Time of secret creation as raw string representation.
+     */
+    public String getCreatedTimeString() {
+        return createdTimeString;
+    }
+
+    /**
+     * @return Time of secret creation.
+     */
+    public ZonedDateTime getCreatedTime() {
+        if (createdTimeString != null && !createdTimeString.isEmpty()) {
+            try {
+                return ZonedDateTime.parse(createdTimeString, TIME_FORMAT);
+            } catch (DateTimeParseException e) {
+                // Ignore.
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * @return Current version number.
+     */
+    public Integer getCurrentVersion() {
+        return currentVersion;
+    }
+
+    /**
+     * @return Maximum number of versions.
+     */
+    public Integer getMaxVersions() {
+        return maxVersions;
+    }
+
+    /**
+     * @return Oldest available version number.
+     */
+    public Integer getOldestVersion() {
+        return oldestVersion;
+    }
+
+    /**
+     * @return Time of secret update as raw string representation.
+     */
+    public String getUpdatedTimeString() {
+        return updatedTime;
+    }
+
+    /**
+     * @return Time of secret update..
+     */
+    public ZonedDateTime getUpdatedTime() {
+        if (updatedTime != null && !updatedTime.isEmpty()) {
+            try {
+                return ZonedDateTime.parse(updatedTime, TIME_FORMAT);
+            } catch (DateTimeParseException e) {
+                // Ignore.
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * @return Version of the entry.
+     */
+    public Map<Integer, VersionMetadata> getVersions() {
+        return versions;
+    }
+
+}

src/main/java/de/stklcode/jvault/connector/model/response/embedded/TokenData.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/main/java/de/stklcode/jvault/connector/model/response/embedded/VersionMetadata.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response.embedded;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeParseException;
+
+/**
+ * Embedded metadata for a single Key-Value v2 version.
+ *
+ * @author  Stefan Kalscheuer
+ * @since   0.8
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public final class VersionMetadata {
+    private static final DateTimeFormatter TIME_FORMAT = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSSSSSSSX");
+
+    @JsonProperty("created_time")
+    private String createdTimeString;
+
+    @JsonProperty("deletion_time")
+    private String deletionTimeString;
+
+    @JsonProperty("destroyed")
+    private boolean destroyed;
+
+    @JsonProperty("version")
+    private Integer version;
+
+    /**
+     * @return Time of secret creation as raw string representation.
+     */
+    public String getCreatedTimeString() {
+        return createdTimeString;
+    }
+
+    /**
+     * @return Time of secret creation.
+     */
+    public ZonedDateTime getCreatedTime() {
+        if (createdTimeString != null && !createdTimeString.isEmpty()) {
+            try {
+                return ZonedDateTime.parse(createdTimeString, TIME_FORMAT);
+            } catch (DateTimeParseException e) {
+                // Ignore.
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * @return Time for secret deletion as raw string representation.
+     */
+    public String getDeletionTimeString() {
+        return deletionTimeString;
+    }
+
+    /**
+     * @return Time for secret deletion.
+     */
+    public ZonedDateTime getDeletionTime() {
+        if (deletionTimeString != null && !deletionTimeString.isEmpty()) {
+            try {
+                return ZonedDateTime.parse(deletionTimeString, TIME_FORMAT);
+            } catch (DateTimeParseException e) {
+                // Ignore.
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * @return Whether the secret is destroyed.
+     */
+    public boolean isDestroyed() {
+        return destroyed;
+    }
+
+    /**
+     * @return Version of the entry.
+     */
+    public Integer getVersion() {
+        return version;
+    }
+
+}

src/main/java/de/stklcode/jvault/connector/model/response/embedded/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Embedded data classes for responses from the Vault API.
+ */
+package de.stklcode.jvault.connector.model.response.embedded;

src/main/java/de/stklcode/jvault/connector/model/response/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Model classes for responses from the Vault API.
+ */
+package de.stklcode.jvault.connector.model.response;

src/main/java/de/stklcode/jvault/connector/package-info.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Java Vault Connector base package - contains {@link de.stklcode.jvault.connector.VaultConnector} interface and
+ * default implementation.
+ */
+package de.stklcode.jvault.connector;

src/main/javadoc/overview.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>API Overview</title>
+</head>
+<body>
+<p>Java Vault Connector is a connector library for Vault by Hashicorp written in Java.</p>
+<p>The connector allows simple usage of Vault's secret store in own applications.</p>
+<p>It features a default implementation for the HTTP(S) interface and supports various authorization methods including
+    AppRole, token and secret handling.</p>
+</body>
+</html>

src/test/java/de/stklcode/jvault/connector/HTTPVaultConnectorOfflineTest.java

@@ -0,0 +1,504 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector;
+
+import de.stklcode.jvault.connector.exception.InvalidRequestException;
+import de.stklcode.jvault.connector.exception.InvalidResponseException;
+import de.stklcode.jvault.connector.exception.PermissionDeniedException;
+import de.stklcode.jvault.connector.exception.VaultConnectorException;
+import net.bytebuddy.ByteBuddy;
+import net.bytebuddy.agent.ByteBuddyAgent;
+import net.bytebuddy.dynamic.loading.ClassReloadingStrategy;
+import org.apache.http.ProtocolVersion;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.entity.ContentType;
+import org.apache.http.entity.StringEntity;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.message.BasicStatusLine;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.Field;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+import java.util.Collections;
+
+import static net.bytebuddy.implementation.MethodDelegation.to;
+import static net.bytebuddy.matcher.ElementMatchers.named;
+import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.hamcrest.CoreMatchers.nullValue;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.junit.jupiter.api.Assertions.fail;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+/**
+ * JUnit test for HTTP Vault connector.
+ * This test suite contains tests that do not require connection to an actual Vault instance.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.7.0
+ */
+public class HTTPVaultConnectorOfflineTest {
+    private static final String INVALID_URL = "foo:/\\1nv4l1d_UrL";
+
+    private static CloseableHttpClient httpMock = mock(CloseableHttpClient.class);
+    private CloseableHttpResponse responseMock = mock(CloseableHttpResponse.class);
+
+    @BeforeAll
+    public static void initByteBuddy() {
+        // Install ByteBuddy Agent.
+        ByteBuddyAgent.install();
+    }
+
+    /**
+     * Helper method for redefinition of {@link HttpClientBuilder#create()} from {@link #initHttpMock()}.
+     *
+     * @return Mocked HTTP client builder.
+     */
+    public static HttpClientBuilder create() {
+        return new MockedHttpClientBuilder();
+    }
+
+    @BeforeEach
+    public void initHttpMock() {
+        // Redefine static method to return Mock on HttpClientBuilder creation.
+        new ByteBuddy().redefine(HttpClientBuilder.class)
+                .method(named("create"))
+                .intercept(to(HTTPVaultConnectorOfflineTest.class))
+                .make()
+                .load(HttpClientBuilder.class.getClassLoader(), ClassReloadingStrategy.fromInstalledAgent());
+
+        // Re-initialize HTTP mock to ensure fresh (empty) results.
+        httpMock = mock(CloseableHttpClient.class);
+    }
+
+    /**
+     * Test exceptions thrown during request.
+     */
+    @Test
+    public void requestExceptionTest() throws IOException {
+        HTTPVaultConnector connector = new HTTPVaultConnector("http://127.0.0.1", null, 0, 250);
+
+        // Test invalid response code.
+        final int responseCode = 400;
+        mockResponse(responseCode, "", ContentType.APPLICATION_JSON);
+        try {
+            connector.getHealth();
+            fail("Querying health status succeeded on invalid instance");
+        } catch (Exception e) {
+            assertThat("Unexpected type of exception", e, instanceOf(InvalidResponseException.class));
+            assertThat("Unexpected exception message", e.getMessage(), is("Invalid response code"));
+            assertThat("Unexpected status code in exception", ((InvalidResponseException) e).getStatusCode(), is(responseCode));
+            assertThat("Response message where none was expected", ((InvalidResponseException) e).getResponse(), is(nullValue()));
+        }
+
+        // Simulate permission denied response.
+        mockResponse(responseCode, "{\"errors\":[\"permission denied\"]}", ContentType.APPLICATION_JSON);
+        try {
+            connector.getHealth();
+            fail("Querying health status succeeded on invalid instance");
+        } catch (Exception e) {
+            assertThat("Unexpected type of exception", e, instanceOf(PermissionDeniedException.class));
+        }
+
+        // Test exception thrown during request.
+        when(httpMock.execute(any())).thenThrow(new IOException("Test Exception"));
+        try {
+            connector.getHealth();
+            fail("Querying health status succeeded on invalid instance");
+        } catch (Exception e) {
+            assertThat("Unexpected type of exception", e, instanceOf(InvalidResponseException.class));
+            assertThat("Unexpected exception message", e.getMessage(), is("Unable to read response"));
+            assertThat("Unexpected cause", e.getCause(), instanceOf(IOException.class));
+        }
+
+        // Now simulate a failing request that succeeds on second try.
+        connector = new HTTPVaultConnector("https://127.0.0.1", null, 1, 250);
+        doReturn(responseMock).doReturn(responseMock).when(httpMock).execute(any());
+        doReturn(new BasicStatusLine(new ProtocolVersion("HTTP", 1, 1), 500, ""))
+                .doReturn(new BasicStatusLine(new ProtocolVersion("HTTP", 1, 1), 500, ""))
+                .doReturn(new BasicStatusLine(new ProtocolVersion("HTTP", 1, 1), 500, ""))
+                .doReturn(new BasicStatusLine(new ProtocolVersion("HTTP", 1, 1), 200, ""))
+                .when(responseMock).getStatusLine();
+        when(responseMock.getEntity()).thenReturn(new StringEntity("{}", ContentType.APPLICATION_JSON));
+
+        try {
+            connector.getHealth();
+        } catch (Exception e) {
+            fail("Request failed unexpectedly: " + e.getMessage());
+        }
+    }
+
+    /**
+     * Test constductors of the {@link HTTPVaultConnector} class.
+     */
+    @Test
+    public void constructorTest() throws IOException, CertificateException {
+        final String url = "https://vault.example.net/test/";
+        final String hostname = "vault.example.com";
+        final Integer port = 1337;
+        final String prefix = "/custom/prefix/";
+        final int retries = 42;
+        final String expectedNoTls = "http://" + hostname + "/v1/";
+        final String expectedCustomPort = "https://" + hostname + ":" + port + "/v1/";
+        final String expectedCustomPrefix = "https://" + hostname + ":" + port + prefix;
+        X509Certificate trustedCaCert;
+
+        try (InputStream is = getClass().getResourceAsStream("/tls/ca.pem")) {
+            trustedCaCert = (X509Certificate) CertificateFactory.getInstance("X.509").generateCertificate(is);
+        }
+
+        // Most basic constructor expects complete URL.
+        HTTPVaultConnector connector = new HTTPVaultConnector(url);
+        assertThat("Unexpected base URL", getRequestHelperPrivate(connector, "baseURL"), is(url));
+
+        // Now override TLS usage.
+        connector = new HTTPVaultConnector(hostname, false);
+        assertThat("Unexpected base URL with TLS disabled", getRequestHelperPrivate(connector, "baseURL"), is(expectedNoTls));
+
+        // Specify custom port.
+        connector = new HTTPVaultConnector(hostname, true, port);
+        assertThat("Unexpected base URL with custom port", getRequestHelperPrivate(connector, "baseURL"), is(expectedCustomPort));
+
+        // Specify custom prefix.
+        connector = new HTTPVaultConnector(hostname, true, port, prefix);
+        assertThat("Unexpected base URL with custom prefix", getRequestHelperPrivate(connector, "baseURL"), is(expectedCustomPrefix));
+        assertThat("Trusted CA cert set, but not specified", getRequestHelperPrivate(connector, "trustedCaCert"), is(nullValue()));
+
+        // Provide custom SSL context.
+        connector = new HTTPVaultConnector(hostname, true, port, prefix, trustedCaCert);
+        assertThat("Unexpected base URL with custom prefix", getRequestHelperPrivate(connector, "baseURL"), is(expectedCustomPrefix));
+        assertThat("Trusted CA cert not filled correctly", getRequestHelperPrivate(connector, "trustedCaCert"), is(trustedCaCert));
+
+        // Specify number of retries.
+        connector = new HTTPVaultConnector(url, trustedCaCert, retries);
+        assertThat("Number of retries not set correctly", getRequestHelperPrivate(connector, "retries"), is(retries));
+
+        // Test TLS version (#22).
+        assertThat("TLS version should be 1.2 if not specified", getRequestHelperPrivate(connector, "tlsVersion"), is("TLSv1.2"));
+        // Now override.
+        connector = new HTTPVaultConnector(url, trustedCaCert, retries, null, "TLSv1.1");
+        assertThat("Overridden TLS version 1.1 not correct", getRequestHelperPrivate(connector, "tlsVersion"), is("TLSv1.1"));
+    }
+
+    /**
+     * This test is designed to test exceptions caught and thrown by seal-methods if Vault is not reachable.
+     */
+    @Test
+    public void sealExceptionTest() throws IOException {
+        HTTPVaultConnector connector = new HTTPVaultConnector(INVALID_URL);
+        try {
+            connector.sealStatus();
+            fail("Querying seal status succeeded on invalid URL");
+        } catch (Exception e) {
+            assertThat("Unexpected type of exception", e, instanceOf(InvalidRequestException.class));
+            assertThat("Unexpected exception message", e.getMessage(), is("Invalid URI format"));
+        }
+
+        connector = new HTTPVaultConnector("https://127.0.0.1", null, 0, 250);
+
+        // Simulate NULL response (mock not supplied with data).
+
+        try {
+            connector.sealStatus();
+            fail("Querying seal status succeeded on invalid instance");
+        } catch (Exception e) {
+            assertThat("Unexpected type of exception", e, instanceOf(InvalidResponseException.class));
+            assertThat("Unexpected exception message", e.getMessage(), is("Response unavailable"));
+        }
+    }
+
+    /**
+     * This test is designed to test exceptions caught and thrown by seal-methods if Vault is not reachable.
+     */
+    @Test
+    public void healthExceptionTest() throws IOException {
+        HTTPVaultConnector connector = new HTTPVaultConnector(INVALID_URL);
+        try {
+            connector.getHealth();
+            fail("Querying health status succeeded on invalid URL");
+        } catch (Exception e) {
+            assertThat("Unexpected type of exception", e, instanceOf(InvalidRequestException.class));
+            assertThat("Unexpected exception message", e.getMessage(), is("Invalid URI format"));
+        }
+
+        connector = new HTTPVaultConnector("https://127.0.0.1", null, 0, 250);
+
+        // Simulate NULL response (mock not supplied with data).
+        try {
+            connector.getHealth();
+            fail("Querying health status succeeded on invalid instance");
+        } catch (Exception e) {
+            assertThat("Unexpected type of exception", e, instanceOf(InvalidResponseException.class));
+            assertThat("Unexpected exception message", e.getMessage(), is("Response unavailable"));
+        }
+    }
+
+    /**
+     * Test behavior on unparsable responses.
+     */
+    @Test
+    public void parseExceptionTest() throws IOException {
+        HTTPVaultConnector connector = new HTTPVaultConnector("https://127.0.0.1", null, 0, 250);
+        // Mock authorization.
+        setPrivate(connector, "authorized", true);
+        // Mock response.
+        mockResponse(200, "invalid", ContentType.APPLICATION_JSON);
+
+        // Now test the methods.
+        try {
+            connector.sealStatus();
+            fail("sealStatus() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.unseal("key");
+            fail("unseal() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.getHealth();
+            fail("getHealth() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.getAuthBackends();
+            fail("getAuthBackends() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.authToken("token");
+            fail("authToken() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.lookupAppRole("roleName");
+            fail("lookupAppRole() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.getAppRoleID("roleName");
+            fail("getAppRoleID() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.createAppRoleSecret("roleName");
+            fail("createAppRoleSecret() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.lookupAppRoleSecret("roleName", "secretID");
+            fail("lookupAppRoleSecret() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.listAppRoles();
+            fail("listAppRoles() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.listAppRoleSecrets("roleName");
+            fail("listAppRoleSecrets() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.read("key");
+            fail("read() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.list("path");
+            fail("list() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.renew("leaseID");
+            fail("renew() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+
+        try {
+            connector.lookupToken("token");
+            fail("lookupToken() succeeded on invalid instance");
+        } catch (Exception e) {
+            assertParseError(e);
+        }
+    }
+
+    private void assertParseError(Exception e) {
+        assertThat("Unexpected type of exception", e, instanceOf(InvalidResponseException.class));
+        assertThat("Unexpected exception message", e.getMessage(), is("Unable to parse response"));
+    }
+
+    /**
+     * Test requests that expect an empty response with code 204, but receive a 200 body.
+     */
+    @Test
+    public void nonEmpty204ResponseTest() throws IOException {
+        HTTPVaultConnector connector = new HTTPVaultConnector("https://127.0.0.1", null, 0, 250);
+        // Mock authorization.
+        setPrivate(connector, "authorized", true);
+        // Mock response.
+        mockResponse(200, "{}", ContentType.APPLICATION_JSON);
+
+        // Now test the methods expecting a 204.
+        try {
+            connector.registerAppId("appID", "policy", "displayName");
+            fail("registerAppId() with 200 response succeeded");
+        } catch (VaultConnectorException e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+
+        try {
+            connector.registerUserId("appID", "userID");
+            fail("registerUserId() with 200 response succeeded");
+        } catch (VaultConnectorException e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+
+        try {
+            connector.createAppRole("appID", Collections.singletonList("policy"));
+            fail("createAppRole() with 200 response succeeded");
+        } catch (VaultConnectorException e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+
+        try {
+            connector.deleteAppRole("roleName");
+            fail("deleteAppRole() with 200 response succeeded");
+        } catch (VaultConnectorException e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+
+        try {
+            connector.setAppRoleID("roleName", "roleID");
+            fail("setAppRoleID() with 200 response succeeded");
+        } catch (VaultConnectorException e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+
+        try {
+            connector.destroyAppRoleSecret("roleName", "secretID");
+            fail("destroyAppRoleSecret() with 200 response succeeded");
+        } catch (VaultConnectorException e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+
+        try {
+            connector.destroyAppRoleSecret("roleName", "secretUD");
+            fail("destroyAppRoleSecret() with 200 response succeeded");
+        } catch (VaultConnectorException e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+
+        try {
+            connector.delete("key");
+            fail("delete() with 200 response succeeded");
+        } catch (VaultConnectorException e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+
+        try {
+            connector.revoke("leaseID");
+            fail("destroyAppRoleSecret() with 200 response succeeded");
+        } catch (VaultConnectorException e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+    }
+
+    private Object getRequestHelperPrivate(HTTPVaultConnector connector, String fieldName)  {
+        try {
+            return getPrivate(getPrivate(connector, "request"), fieldName);
+        } catch (NoSuchFieldException | IllegalAccessException e) {
+            return null;
+        }
+    }
+
+    private Object getPrivate(Object target, String fieldName) throws NoSuchFieldException, IllegalAccessException {
+        Field field = target.getClass().getDeclaredField(fieldName);
+        if (field.isAccessible()) {
+            return field.get(target);
+        }
+        field.setAccessible(true);
+        Object value = field.get(target);
+        field.setAccessible(false);
+        return value;
+    }
+
+    private void setPrivate(Object target, String fieldName, Object value) {
+        try {
+            Field field = target.getClass().getDeclaredField(fieldName);
+            boolean accessible = field.isAccessible();
+            field.setAccessible(true);
+            field.set(target, value);
+            field.setAccessible(accessible);
+        } catch (NoSuchFieldException | IllegalAccessException e) {
+            // Should not occur, to be taken care of in test code.
+        }
+    }
+
+    private void mockResponse(int status, String body, ContentType type) throws IOException {
+        when(httpMock.execute(any())).thenReturn(responseMock);
+        when(responseMock.getStatusLine()).thenReturn(new BasicStatusLine(new ProtocolVersion("HTTP", 1, 1), status, ""));
+        when(responseMock.getEntity()).thenReturn(new StringEntity(body, type));
+    }
+
+    /**
+     * Mocked {@link HttpClientBuilder} that always returns the mocked client.
+     */
+    private static class MockedHttpClientBuilder extends HttpClientBuilder {
+        @Override
+        public CloseableHttpClient build() {
+            return httpMock;
+        }
+    }
+
+}

src/test/java/de/stklcode/jvault/connector/builder/HTTPVaultConnectorBuilderTest.java

@@ -0,0 +1,135 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.builder;
+
+import de.stklcode.jvault.connector.HTTPVaultConnector;
+import de.stklcode.jvault.connector.exception.TlsException;
+import de.stklcode.jvault.connector.exception.VaultConnectorException;
+import org.junit.Rule;
+import org.junit.contrib.java.lang.system.EnvironmentVariables;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.junit.jupiter.migrationsupport.rules.EnableRuleMigrationSupport;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.nio.file.NoSuchFileException;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * JUnit test for HTTP Vault connector factory
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8.0
+ */
+@EnableRuleMigrationSupport
+public class HTTPVaultConnectorBuilderTest {
+    private static final String VAULT_ADDR = "https://localhost:8201";
+    private static final Integer VAULT_MAX_RETRIES = 13;
+    private static final String VAULT_TOKEN = "00001111-2222-3333-4444-555566667777";
+
+    @TempDir
+    File tempDir;
+
+    @Rule
+    public final EnvironmentVariables environment = new EnvironmentVariables();
+
+    /**
+     * Test building from environment variables
+     */
+    @Test
+    void testFromEnv() throws NoSuchFieldException, IllegalAccessException, IOException {
+        /* Provide address only should be enough */
+        setenv(VAULT_ADDR, null, null, null);
+
+        HTTPVaultConnectorBuilder factory = null;
+        HTTPVaultConnector connector;
+        try {
+            factory = VaultConnectorBuilder.http().fromEnv();
+        } catch (VaultConnectorException e) {
+            fail("Factory creation from minimal environment failed");
+        }
+        connector = factory.build();
+
+        assertThat("URL nor set correctly", getRequestHelperPrivate(connector, "baseURL"), is(equalTo(VAULT_ADDR + "/v1/")));
+        assertThat("Trusted CA cert set when no cert provided", getRequestHelperPrivate(connector, "trustedCaCert"), is(nullValue()));
+        assertThat("Non-default number of retries, when none set", getRequestHelperPrivate(connector, "retries"), is(0));
+
+        /* Provide address and number of retries */
+        setenv(VAULT_ADDR, null, VAULT_MAX_RETRIES.toString(), null);
+
+        try {
+            factory = VaultConnectorBuilder.http().fromEnv();
+        } catch (VaultConnectorException e) {
+            fail("Factory creation from environment failed");
+        }
+        connector = factory.build();
+
+        assertThat("URL nor set correctly", getRequestHelperPrivate(connector, "baseURL"), is(equalTo(VAULT_ADDR + "/v1/")));
+        assertThat("Trusted CA cert set when no cert provided", getRequestHelperPrivate(connector, "trustedCaCert"), is(nullValue()));
+        assertThat("Number of retries not set correctly", getRequestHelperPrivate(connector, "retries"), is(VAULT_MAX_RETRIES));
+
+        /* Provide CA certificate */
+        String VAULT_CACERT = tempDir.toString() + "/doesnotexist";
+        setenv(VAULT_ADDR, VAULT_CACERT, VAULT_MAX_RETRIES.toString(), null);
+
+        try {
+            VaultConnectorBuilder.http().fromEnv();
+            fail("Creation with unknown cert path failed.");
+        } catch (VaultConnectorException e) {
+            assertThat(e, is(instanceOf(TlsException.class)));
+            assertThat(e.getCause(), is(instanceOf(NoSuchFileException.class)));
+            assertThat(((NoSuchFileException) e.getCause()).getFile(), is(VAULT_CACERT));
+        }
+
+        /* Automatic authentication */
+        setenv(VAULT_ADDR, null, VAULT_MAX_RETRIES.toString(), VAULT_TOKEN);
+
+        try {
+            factory = VaultConnectorBuilder.http().fromEnv();
+        } catch (VaultConnectorException e) {
+            fail("Factory creation from minimal environment failed");
+        }
+        assertThat("Token nor set correctly", getPrivate(factory, "token"), is(equalTo(VAULT_TOKEN)));
+    }
+
+    private void setenv(String vault_addr, String vault_cacert, String vault_max_retries, String vault_token) {
+        environment.set("VAULT_ADDR", vault_addr);
+        environment.set("VAULT_CACERT", vault_cacert);
+        environment.set("VAULT_MAX_RETRIES", vault_max_retries);
+        environment.set("VAULT_TOKEN", vault_token);
+    }
+
+    private Object getRequestHelperPrivate(HTTPVaultConnector connector, String fieldName) throws NoSuchFieldException, IllegalAccessException {
+        return getPrivate(getPrivate(connector, "request"), fieldName);
+    }
+
+    private Object getPrivate(Object target, String fieldName) throws NoSuchFieldException, IllegalAccessException {
+        Field field = target.getClass().getDeclaredField(fieldName);
+        if (field.isAccessible()) {
+            return field.get(target);
+        }
+        field.setAccessible(true);
+        Object value = field.get(target);
+        field.setAccessible(false);
+        return value;
+    }
+}

src/test/java/de/stklcode/jvault/connector/exception/VaultConnectorExceptionTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,12 +16,12 @@
 
 package de.stklcode.jvault.connector.exception;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.instanceOf;
 import static org.hamcrest.Matchers.nullValue;
 import static org.hamcrest.core.Is.is;
-import static org.junit.Assert.assertThat;
 
 /**
  * Common JUnit test for Exceptions extending {@link VaultConnectorException}.

src/test/java/de/stklcode/jvault/connector/factory/HTTPVaultConnectorFactoryTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,18 +19,20 @@ package de.stklcode.jvault.connector.factory;
 import de.stklcode.jvault.connector.HTTPVaultConnector;
 import de.stklcode.jvault.connector.exception.TlsException;
 import de.stklcode.jvault.connector.exception.VaultConnectorException;
-
 import org.junit.Rule;
-import org.junit.Test;
 import org.junit.contrib.java.lang.system.EnvironmentVariables;
-import org.junit.rules.TemporaryFolder;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.junit.jupiter.migrationsupport.rules.EnableRuleMigrationSupport;
 
+import java.io.File;
 import java.io.IOException;
 import java.lang.reflect.Field;
 import java.nio.file.NoSuchFileException;
 
 import static org.hamcrest.CoreMatchers.*;
-import static org.junit.Assert.*;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.jupiter.api.Assertions.fail;
 
 /**
  * JUnit test for HTTP Vault connector factory
@@ -38,13 +40,14 @@ import static org.junit.Assert.*;
  * @author Stefan Kalscheuer
  * @since 0.6.0
  */
+@EnableRuleMigrationSupport
 public class HTTPVaultConnectorFactoryTest {
     private static String VAULT_ADDR = "https://localhost:8201";
     private static Integer VAULT_MAX_RETRIES = 13;
     private static String VAULT_TOKEN = "00001111-2222-3333-4444-555566667777";
 
-    @Rule
-    public TemporaryFolder tmpDir = new TemporaryFolder();
+    @TempDir
+    File tempDir;
 
     @Rule
     public final EnvironmentVariables environment = new EnvironmentVariables();
@@ -66,9 +69,9 @@ public class HTTPVaultConnectorFactoryTest {
         }
         connector = factory.build();
 
-        assertThat("URL nor set correctly", getPrivate(connector, "baseURL"), is(equalTo(VAULT_ADDR + "/v1/")));
-        assertThat("SSL context set when no cert provided", getPrivate(connector, "sslContext"), is(nullValue()));
-        assertThat("Non-default number of retries, when none set", getPrivate(connector, "retries"), is(0));
+        assertThat("URL nor set correctly", getRequestHelperPrivate(connector, "baseURL"), is(equalTo(VAULT_ADDR + "/v1/")));
+        assertThat("Trusted CA cert set when no cert provided", getRequestHelperPrivate(connector, "trustedCaCert"), is(nullValue()));
+        assertThat("Non-default number of retries, when none set", getRequestHelperPrivate(connector, "retries"), is(0));
 
         /* Provide address and number of retries */
         setenv(VAULT_ADDR, null, VAULT_MAX_RETRIES.toString(), null);
@@ -80,12 +83,12 @@ public class HTTPVaultConnectorFactoryTest {
         }
         connector = factory.build();
 
-        assertThat("URL nor set correctly", getPrivate(connector, "baseURL"), is(equalTo(VAULT_ADDR + "/v1/")));
-        assertThat("SSL context set when no cert provided", getPrivate(connector, "sslContext"), is(nullValue()));
-        assertThat("Number of retries not set correctly", getPrivate(connector, "retries"), is(VAULT_MAX_RETRIES));
+        assertThat("URL nor set correctly", getRequestHelperPrivate(connector, "baseURL"), is(equalTo(VAULT_ADDR + "/v1/")));
+        assertThat("Trusted CA cert set when no cert provided", getRequestHelperPrivate(connector, "trustedCaCert"), is(nullValue()));
+        assertThat("Number of retries not set correctly", getRequestHelperPrivate(connector, "retries"), is(VAULT_MAX_RETRIES));
 
         /* Provide CA certificate */
-        String VAULT_CACERT = tmpDir.newFolder().toString() + "/doesnotexist";
+        String VAULT_CACERT = tempDir.toString() + "/doesnotexist";
         setenv(VAULT_ADDR, VAULT_CACERT, VAULT_MAX_RETRIES.toString(), null);
 
         try {
@@ -94,7 +97,7 @@ public class HTTPVaultConnectorFactoryTest {
         } catch (VaultConnectorException e) {
             assertThat(e, is(instanceOf(TlsException.class)));
             assertThat(e.getCause(), is(instanceOf(NoSuchFileException.class)));
-            assertThat(((NoSuchFileException)e.getCause()).getFile(), is(VAULT_CACERT));
+            assertThat(((NoSuchFileException) e.getCause()).getFile(), is(VAULT_CACERT));
         }
 
         /* Automatic authentication */
@@ -105,7 +108,7 @@ public class HTTPVaultConnectorFactoryTest {
         } catch (VaultConnectorException e) {
             fail("Factory creation from minimal environment failed");
         }
-        assertThat("Token nor set correctly", getPrivate(factory, "token"), is(equalTo(VAULT_TOKEN)));
+        assertThat("Token nor set correctly", getPrivate(getPrivate(factory, "delegate"), "token"), is(equalTo(VAULT_TOKEN)));
     }
 
     private void setenv(String vault_addr, String vault_cacert, String vault_max_retries, String vault_token) {
@@ -115,10 +118,15 @@ public class HTTPVaultConnectorFactoryTest {
         environment.set("VAULT_TOKEN", vault_token);
     }
 
+    private Object getRequestHelperPrivate(HTTPVaultConnector connector, String fieldName) throws NoSuchFieldException, IllegalAccessException {
+        return getPrivate(getPrivate(connector, "request"), fieldName);
+    }
+
     private Object getPrivate(Object target, String fieldName) throws NoSuchFieldException, IllegalAccessException {
         Field field = target.getClass().getDeclaredField(fieldName);
-        if (field.isAccessible())
+        if (field.isAccessible()) {
             return field.get(target);
+        }
         field.setAccessible(true);
         Object value = field.get(target);
         field.setAccessible(false);

src/test/java/de/stklcode/jvault/connector/model/AppRoleBuilderTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,13 +18,14 @@ package de.stklcode.jvault.connector.model;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.List;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertThat;
 
 /**
  * JUnit Test for AppRole Builder.
@@ -50,10 +51,10 @@ public class AppRoleBuilderTest {
     private static final Integer TOKEN_MAX_TTL = 9600;
     private static final Integer PERIOD = 1234;
     private static final String JSON_MIN = "{\"role_name\":\"" + NAME + "\"}";
-    private static final String JSON_FULL = String.format("{\"role_name\":\"%s\",\"role_id\":\"%s\",\"bind_secret_id\":%s,\"bound_cidr_list\":\"%s\",\"policies\":\"%s\",\"secret_id_num_uses\":%d,\"secret_id_ttl\":%d,\"token_ttl\":%d,\"token_max_ttl\":%d,\"period\":%d}",
-            NAME, ID, BIND_SECRET_ID, CIDR_1, POLICY, SECRET_ID_NUM_USES, SECRET_ID_TTL, TOKEN_TTL, TOKEN_MAX_TTL, PERIOD);
+    private static final String JSON_FULL = String.format("{\"role_name\":\"%s\",\"role_id\":\"%s\",\"bind_secret_id\":%s,\"bound_cidr_list\":\"%s\",\"secret_id_bound_cidrs\":\"%s\",\"policies\":\"%s\",\"secret_id_num_uses\":%d,\"secret_id_ttl\":%d,\"token_ttl\":%d,\"token_max_ttl\":%d,\"period\":%d}",
+            NAME, ID, BIND_SECRET_ID, CIDR_1, CIDR_1, POLICY, SECRET_ID_NUM_USES, SECRET_ID_TTL, TOKEN_TTL, TOKEN_MAX_TTL, PERIOD);
 
-    @BeforeClass
+    @BeforeAll
     public static void init() {
         BOUND_CIDR_LIST.add(CIDR_1);
         POLICIES.add(POLICY);
@@ -68,6 +69,7 @@ public class AppRoleBuilderTest {
         assertThat(role.getId(), is(nullValue()));
         assertThat(role.getBindSecretId(), is(nullValue()));
         assertThat(role.getBoundCidrList(), is(nullValue()));
+        assertThat(role.getSecretIdBoundCidrs(), is(nullValue()));
         assertThat(role.getPolicies(), is(nullValue()));
         assertThat(role.getSecretIdNumUses(), is(nullValue()));
         assertThat(role.getSecretIdTtl(), is(nullValue()));
@@ -88,6 +90,7 @@ public class AppRoleBuilderTest {
                 .withId(ID)
                 .withBindSecretID(BIND_SECRET_ID)
                 .withBoundCidrList(BOUND_CIDR_LIST)
+                .withSecretIdBoundCidrs(BOUND_CIDR_LIST)
                 .withPolicies(POLICIES)
                 .withSecretIdNumUses(SECRET_ID_NUM_USES)
                 .withSecretIdTtl(SECRET_ID_TTL)
@@ -99,6 +102,7 @@ public class AppRoleBuilderTest {
         assertThat(role.getId(), is(ID));
         assertThat(role.getBindSecretId(), is(BIND_SECRET_ID));
         assertThat(role.getBoundCidrList(), is(BOUND_CIDR_LIST));
+        assertThat(role.getSecretIdBoundCidrs(), is(BOUND_CIDR_LIST));
         assertThat(role.getPolicies(), is(POLICIES));
         assertThat(role.getSecretIdNumUses(), is(SECRET_ID_NUM_USES));
         assertThat(role.getSecretIdTtl(), is(SECRET_ID_TTL));
@@ -127,12 +131,16 @@ public class AppRoleBuilderTest {
         role = new AppRoleBuilder(NAME).withCidrBlock(CIDR_2).build();
         assertThat(role.getBoundCidrList(), hasSize(1));
         assertThat(role.getBoundCidrList(), contains(CIDR_2));
+        assertThat(role.getSecretIdBoundCidrs(), hasSize(1));
+        assertThat(role.getSecretIdBoundCidrs(), contains(CIDR_2));
         role = new AppRoleBuilder(NAME)
-                .withBoundCidrList(BOUND_CIDR_LIST)
+                .withSecretIdBoundCidrs(BOUND_CIDR_LIST)
                 .withCidrBlock(CIDR_2)
                 .build();
-        assertThat(role.getBoundCidrList(), hasSize(2));
-        assertThat(role.getBoundCidrList(), contains(CIDR_1, CIDR_2));
+        assertThat(role.getBoundCidrList(), hasSize(1));
+        assertThat(role.getBoundCidrList(), contains(CIDR_2));
+        assertThat(role.getSecretIdBoundCidrs(), hasSize(2));
+        assertThat(role.getSecretIdBoundCidrs(), contains(CIDR_1, CIDR_2));
 
         /* Add single policy */
         role = new AppRoleBuilder(NAME).withPolicy(POLICY_2).build();

src/test/java/de/stklcode/jvault/connector/model/AppRoleSecretTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,11 +16,9 @@
 
 package de.stklcode.jvault.connector.model;
 
-import com.fasterxml.jackson.core.JsonParseException;
 import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.JsonMappingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
 import java.lang.reflect.Field;
@@ -29,12 +27,11 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import static org.hamcrest.Matchers.emptyString;
-import static org.hamcrest.Matchers.is;
-import static org.hamcrest.Matchers.nullValue;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
 import static org.hamcrest.junit.MatcherAssume.assumeThat;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.fail;
+
 
 /**
  * JUnit Test for AppRoleSecret model.

src/test/java/de/stklcode/jvault/connector/model/AuthBackendTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,10 +16,10 @@
 
 package de.stklcode.jvault.connector.model;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertThat;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
 
 /**
  * JUnit Test for AuthBackend model.

src/test/java/de/stklcode/jvault/connector/model/TokenBuilderTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,16 +18,16 @@ package de.stklcode.jvault.connector.model;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
 
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertThat;
 
 /**
  * JUnit Test for Token Builder.
@@ -55,7 +55,7 @@ public class TokenBuilderTest {
     private static final Boolean RENEWABLE = true;
     private static final String JSON_FULL = "{\"id\":\"test-id\",\"display_name\":\"display-name\",\"no_parent\":false,\"no_default_policy\":false,\"ttl\":123,\"num_uses\":4,\"policies\":[\"policy\"],\"meta\":{\"key\":\"value\"},\"renewable\":true}";
 
-    @BeforeClass
+    @BeforeAll
     public static void init() {
         POLICIES.add(POLICY);
         META.put(META_KEY, META_VALUE);

src/test/java/de/stklcode/jvault/connector/model/response/AppRoleResponseTest.java

@@ -1,17 +1,33 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package de.stklcode.jvault.connector.model.response;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import de.stklcode.jvault.connector.exception.InvalidResponseException;
 import de.stklcode.jvault.connector.model.AppRole;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.fail;
 
 /**
  * JUnit Test for {@link AppRoleResponse} model.

src/test/java/de/stklcode/jvault/connector/model/response/AuthMethodsResponseTest.java

@@ -1,20 +1,34 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package de.stklcode.jvault.connector.model.response;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import de.stklcode.jvault.connector.exception.InvalidResponseException;
 import de.stklcode.jvault.connector.model.AuthBackend;
-import de.stklcode.jvault.connector.model.response.embedded.AuthData;
 import de.stklcode.jvault.connector.model.response.embedded.AuthMethod;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.fail;
 
 /**
  * JUnit Test for {@link AuthMethodsResponse} model.

src/test/java/de/stklcode/jvault/connector/model/response/AuthResponseTest.java

@@ -1,17 +1,33 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package de.stklcode.jvault.connector.model.response;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import de.stklcode.jvault.connector.exception.InvalidResponseException;
 import de.stklcode.jvault.connector.model.response.embedded.AuthData;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.fail;
 
 /**
  * JUnit Test for {@link AuthResponse} model.

src/test/java/de/stklcode/jvault/connector/model/response/CredentialsResponseTest.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stklcode.jvault.connector.exception.InvalidResponseException;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * JUnit Test for {@link CredentialsResponse} model.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8
+ */
+public class CredentialsResponseTest {
+    private static final Map<String, Object> DATA = new HashMap<>();
+    private static final String VAL_USER = "testUserName";
+    private static final String VAL_PASS = "5up3r5ecr3tP455";
+
+    static {
+        DATA.put("username", VAL_USER);
+        DATA.put("password", VAL_PASS);
+    }
+
+    /**
+     * Test getter, setter and get-methods for response data.
+     *
+     * @throws InvalidResponseException Should not occur
+     */
+    @Test
+    @SuppressWarnings("unchecked")
+    public void getCredentialsTest() throws InvalidResponseException {
+        // Create empty Object.
+        CredentialsResponse res = new CredentialsResponse();
+        assertThat("Username not present in data map should not return anything", res.getUsername(), is(nullValue()));
+        assertThat("Password not present in data map should not return anything", res.getPassword(), is(nullValue()));
+
+        // Fill data map.
+        res.setData(DATA);
+        assertThat("Incorrect username", res.getUsername(), is(VAL_USER));
+        assertThat("Incorrect password", res.getPassword(), is(VAL_PASS));
+    }
+}

src/test/java/de/stklcode/jvault/connector/model/response/HealthResponseTest.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * JUnit Test for {@link AuthResponse} model.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.7.0
+ */
+public class HealthResponseTest {
+    private static final String CLUSTER_ID = "c9abceea-4f46-4dab-a688-5ce55f89e228";
+    private static final String CLUSTER_NAME = "vault-cluster-5515c810";
+    private static final String VERSION = "0.9.2";
+    private static final Long SERVER_TIME_UTC = 1469555798L;
+    private static final Boolean STANDBY = false;
+    private static final Boolean SEALED = false;
+    private static final Boolean INITIALIZED = true;
+    private static final Boolean PERF_STANDBY = false;
+    private static final String REPL_PERF_MODE = "disabled";
+    private static final String REPL_DR_MODE = "disabled";
+
+    private static final String RES_JSON = "{\n" +
+            "  \"cluster_id\": \"" + CLUSTER_ID + "\",\n" +
+            "  \"cluster_name\": \"" + CLUSTER_NAME + "\",\n" +
+            "  \"version\": \"" + VERSION + "\",\n" +
+            "  \"server_time_utc\": " + SERVER_TIME_UTC + ",\n" +
+            "  \"standby\": " + STANDBY + ",\n" +
+            "  \"sealed\": " + SEALED + ",\n" +
+            "  \"initialized\": " + INITIALIZED + ",\n" +
+            "  \"replication_perf_mode\": \"" + REPL_PERF_MODE + "\",\n" +
+            "  \"replication_dr_mode\": \"" + REPL_DR_MODE + "\",\n" +
+            "  \"performance_standby\": " + PERF_STANDBY + "\n" +
+            "}";
+    /**
+     * Test creation from JSON value as returned by Vault (JSON example copied from Vault documentation).
+     */
+    @Test
+    public void jsonRoundtrip() {
+        try {
+            HealthResponse res = new ObjectMapper().readValue(RES_JSON, HealthResponse.class);
+            assertThat("Parsed response is NULL", res, is(notNullValue()));
+            assertThat("Incorrect cluster ID", res.getClusterID(), is(CLUSTER_ID));
+            assertThat("Incorrect cluster name", res.getClusterName(), is(CLUSTER_NAME));
+            assertThat("Incorrect version", res.getVersion(), is(VERSION));
+            assertThat("Incorrect server time", res.getServerTimeUTC(), is(SERVER_TIME_UTC));
+            assertThat("Incorrect standby state", res.isStandby(), is(STANDBY));
+            assertThat("Incorrect seal state", res.isSealed(), is(SEALED));
+            assertThat("Incorrect initialization state", res.isInitialized(), is(INITIALIZED));
+            assertThat("Incorrect performance standby state", res.isPerformanceStandby(), is(PERF_STANDBY));
+            assertThat("Incorrect replication perf mode", res.getReplicationPerfMode(), is(REPL_PERF_MODE));
+            assertThat("Incorrect replication DR mode", res.getReplicationDrMode(), is(REPL_DR_MODE));
+        } catch (IOException e) {
+            fail("Health deserialization failed: " + e.getMessage());
+        }
+    }
+}

src/test/java/de/stklcode/jvault/connector/model/response/MetadataResponseTest.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import de.stklcode.jvault.connector.exception.InvalidResponseException;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * JUnit Test for {@link MetadataResponse} model.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8
+ */
+public class MetadataResponseTest {
+    private static final String V1_TIME = "2018-03-22T02:24:06.945319214Z";
+    private static final String V3_TIME = "2018-03-22T02:36:43.986212308Z";
+    private static final String V2_TIME = "2018-03-22T02:36:33.954880664Z";
+    private static final Integer CURRENT_VERSION = 3;
+    private static final Integer MAX_VERSIONS = 0;
+    private static final Integer OLDEST_VERSION = 1;
+
+    private static final String META_JSON = "{\n" +
+            "  \"data\": {\n" +
+            "    \"created_time\": \"" + V1_TIME + "\",\n" +
+            "    \"current_version\": " + CURRENT_VERSION + ",\n" +
+            "    \"max_versions\": " + MAX_VERSIONS + ",\n" +
+            "    \"oldest_version\": " + OLDEST_VERSION + ",\n" +
+            "    \"updated_time\": \"" + V3_TIME + "\",\n" +
+            "    \"versions\": {\n" +
+            "      \"1\": {\n" +
+            "        \"created_time\": \"" + V1_TIME + "\",\n" +
+            "        \"deletion_time\": \"" + V2_TIME + "\",\n" +
+            "        \"destroyed\": true\n" +
+            "      },\n" +
+            "      \"2\": {\n" +
+            "        \"created_time\": \"" + V2_TIME + "\",\n" +
+            "        \"deletion_time\": \"\",\n" +
+            "        \"destroyed\": false\n" +
+            "      },\n" +
+            "      \"3\": {\n" +
+            "        \"created_time\": \"" + V3_TIME + "\",\n" +
+            "        \"deletion_time\": \"\",\n" +
+            "        \"destroyed\": false\n" +
+            "      }\n" +
+            "    }\n" +
+            "  }\n" +
+            "}";
+
+    /**
+     * Test creation from JSON value as returned by Vault (JSON example copied from Vault documentation).
+     */
+    @Test
+    public void jsonRoundtrip() {
+        try {
+            MetadataResponse res = new ObjectMapper().readValue(META_JSON, MetadataResponse.class);
+            assertThat("Parsed response is NULL", res, is(notNullValue()));
+            assertThat("Parsed metadatra is NULL", res.getMetadata(), is(notNullValue()));
+            assertThat("Incorrect created time", res.getMetadata().getCreatedTimeString(), is(V1_TIME));
+            assertThat("Parting created time failed", res.getMetadata().getCreatedTime(), is(notNullValue()));
+            assertThat("Incorrect current version", res.getMetadata().getCurrentVersion(), is(CURRENT_VERSION));
+            assertThat("Incorrect max versions", res.getMetadata().getMaxVersions(), is(MAX_VERSIONS));
+            assertThat("Incorrect oldest version", res.getMetadata().getOldestVersion(), is(OLDEST_VERSION));
+            assertThat("Incorrect updated time", res.getMetadata().getUpdatedTimeString(), is(V3_TIME));
+            assertThat("Parting updated time failed", res.getMetadata().getUpdatedTime(), is(notNullValue()));
+            assertThat("Incorrect number of versions", res.getMetadata().getVersions().size(), is(3));
+            assertThat("Incorrect version 1 delete time", res.getMetadata().getVersions().get(1).getDeletionTimeString(), is(V2_TIME));
+            assertThat("Parsion version delete time failed", res.getMetadata().getVersions().get(1).getDeletionTime(), is(notNullValue()));
+            assertThat("Incorrect version 1 destroyed state", res.getMetadata().getVersions().get(1).isDestroyed(), is(true));
+            assertThat("Incorrect version 2 created time", res.getMetadata().getVersions().get(2).getCreatedTimeString(), is(V2_TIME));
+            assertThat("Parsion version created failed", res.getMetadata().getVersions().get(2).getCreatedTime(), is(notNullValue()));
+            assertThat("Incorrect version 3 destroyed state", res.getMetadata().getVersions().get(3).isDestroyed(), is(false));
+
+        } catch (IOException e) {
+            fail("MetadataResoponse deserialization failed: " + e.getMessage());
+        }
+    }
+}

src/test/java/de/stklcode/jvault/connector/model/response/SealResponseTest.java

@@ -0,0 +1,112 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * JUnit Test for {@link SealResponse} model.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8
+ */
+public class SealResponseTest {
+    private static final String TYPE = "shamir";
+    private static final Integer THRESHOLD = 3;
+    private static final Integer SHARES = 5;
+    private static final Integer PROGRESS_SEALED = 2;
+    private static final Integer PROGRESS_UNSEALED = 0;
+    private static final String VERSION = "0.11.2";
+    private static final String CLUSTER_NAME = "vault-cluster-d6ec3c7f";
+    private static final String CLUSTER_ID = "3e8b3fec-3749-e056-ba41-b62a63b997e8";
+    private static final String NONCE = "ef05d55d-4d2c-c594-a5e8-55bc88604c24";
+
+    private static final String RES_SEALED = "{\n" +
+            "  \"type\": \"" + TYPE + "\",\n" +
+            "  \"sealed\": true,\n" +
+            "  \"initialized\": true,\n" +
+            "  \"t\": " + THRESHOLD + ",\n" +
+            "  \"n\": " + SHARES + ",\n" +
+            "  \"progress\": " + PROGRESS_SEALED + ",\n" +
+            "  \"nonce\": \"\",\n" +
+            "  \"version\": \"" + VERSION + "\"\n" +
+            "}";
+
+    private static final String RES_UNSEALED = "{\n" +
+            "  \"type\": \"" + TYPE + "\",\n" +
+            "  \"sealed\": false,\n" +
+            "  \"initialized\": true,\n" +
+            "  \"t\": " + THRESHOLD + ",\n" +
+            "  \"n\": " + SHARES + ",\n" +
+            "  \"progress\": " + PROGRESS_UNSEALED + ",\n" +
+            "  \"version\": \"" + VERSION + "\",\n" +
+            "  \"cluster_name\": \"" + CLUSTER_NAME + "\",\n" +
+            "  \"cluster_id\": \"" + CLUSTER_ID + "\",\n" +
+            "  \"nonce\": \"" + NONCE + "\"\n" +
+            "}";
+
+    /**
+     * Test creation from JSON value as returned by Vault when sealed (JSON example close to Vault documentation).
+     */
+    @Test
+    public void jsonRoundtripSealed() {
+        // First test sealed Vault's response.
+        try {
+            SealResponse res = new ObjectMapper().readValue(RES_SEALED, SealResponse.class);
+            assertThat("Parsed response is NULL", res, is(notNullValue()));
+            assertThat("Incorrect seal type", res.getType(), is(TYPE));
+            assertThat("Incorrect seal status", res.isSealed(), is(true));
+            assertThat("Incorrect initialization status", res.isInitialized(), is(true));
+            assertThat("Incorrect threshold", res.getThreshold(), is(THRESHOLD));
+            assertThat("Incorrect number of shares", res.getNumberOfShares(), is(SHARES));
+            assertThat("Incorrect progress", res.getProgress(), is(PROGRESS_SEALED));
+            assertThat("Nonce not empty", res.getNonce(), is(""));
+            assertThat("Incorrect version", res.getVersion(), is(VERSION));
+            // And the fields, that should not be filled.
+            assertThat("Cluster name should not be populated", res.getClusterName(), is(nullValue()));
+            assertThat("Cluster ID should not be populated", res.getClusterId(), is(nullValue()));
+        } catch (IOException e) {
+            fail("TokenResponse deserialization failed: " + e.getMessage());
+        }
+
+
+        // Not test unsealed Vault's response.
+        try {
+            SealResponse res = new ObjectMapper().readValue(RES_UNSEALED, SealResponse.class);
+            assertThat("Parsed response is NULL", res, is(notNullValue()));
+            assertThat("Incorrect seal type", res.getType(), is(TYPE));
+            assertThat("Incorrect seal status", res.isSealed(), is(false));
+            assertThat("Incorrect initialization status", res.isInitialized(), is(true));
+            assertThat("Incorrect threshold", res.getThreshold(), is(THRESHOLD));
+            assertThat("Incorrect number of shares", res.getNumberOfShares(), is(SHARES));
+            assertThat("Incorrect progress", res.getProgress(), is(PROGRESS_UNSEALED));
+            assertThat("Incorrect nonce", res.getNonce(), is(NONCE));
+            assertThat("Incorrect version", res.getVersion(), is(VERSION));
+            assertThat("Incorrect cluster name", res.getClusterName(), is(CLUSTER_NAME));
+            assertThat("Incorrect cluster ID", res.getClusterId(), is(CLUSTER_ID));
+        } catch (IOException e) {
+            fail("TokenResponse deserialization failed: " + e.getMessage());
+        }
+    }
+}

src/test/java/de/stklcode/jvault/connector/model/response/SecretListResponseTest.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import de.stklcode.jvault.connector.exception.InvalidResponseException;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.fail;
+
+/**
+ * JUnit Test for {@link SecretListResponse} model.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8
+ */
+public class SecretListResponseTest {
+    private static final Map<String, Object> DATA = new HashMap<>();
+    private static final String KEY1 = "key1";
+    private static final String KEY2 = "key-2";
+    private static final List<String> KEYS = Arrays.asList(KEY1, KEY2);
+
+    static {
+        DATA.put("keys", KEYS);
+    }
+
+    /**
+     * Test getter, setter and get-methods for response data.
+     *
+     * @throws InvalidResponseException Should not occur
+     */
+    @Test
+    @SuppressWarnings("unchecked")
+    public void getKeysTest() throws InvalidResponseException {
+        // Create empty Object.
+        SecretListResponse res = new SecretListResponse();
+        assertThat("Keys should be null without initialization", res.getKeys(), is(nullValue()));
+
+        // Provoke internal ClassCastException.
+        try {
+            Map<String, Object> invalidData = new HashMap<>();
+            invalidData.put("keys", "some string");
+            res.setData(invalidData);
+            fail("Setting incorrect class succeeded");
+        } catch (Exception e) {
+            assertThat("Unexpected exception type", e, instanceOf(InvalidResponseException.class));
+        }
+
+        // Fill correct data.
+        res.setData(DATA);
+        assertThat("Keys should be filled here", res.getKeys(), is(notNullValue()));
+        assertThat("Unexpected number of keys", res.getKeys(), hasSize(2));
+        assertThat("Unexpected keys", res.getKeys(), contains(KEY1, KEY2));
+    }
+}

src/test/java/de/stklcode/jvault/connector/model/response/SecretResponseTest.java

@@ -1,17 +1,33 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package de.stklcode.jvault.connector.model.response;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import de.stklcode.jvault.connector.exception.InvalidResponseException;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.fail;
 
 /**
  * JUnit Test for {@link SecretResponse} model.
@@ -37,6 +53,8 @@ public class SecretResponseTest {
     private static final String SECRET_DATA_V1 = "yes";
     private static final String SECRET_DATA_K2 = "value";
     private static final String SECRET_DATA_V2 = "world";
+    private static final String SECRET_META_CREATED = "2018-03-22T02:24:06.945319214Z";
+    private static final String SECRET_META_DELETED = "2018-03-23T03:25:07.056420325Z";
     private static final List<String> SECRET_WARNINGS = null;
     private static final String SECRET_JSON = "{\n" +
             "    \"request_id\": \"" + SECRET_REQUEST_ID + "\",\n" +
@@ -49,6 +67,44 @@ public class SecretResponseTest {
             "    },\n" +
             "    \"warnings\": " + SECRET_WARNINGS + "\n" +
             "}";
+    private static final String SECRET_JSON_V2 = "{\n" +
+            "    \"request_id\": \"" + SECRET_REQUEST_ID + "\",\n" +
+            "    \"lease_id\": \"" + SECRET_LEASE_ID + "\",\n" +
+            "    \"lease_duration\": " + SECRET_LEASE_DURATION + ",\n" +
+            "    \"renewable\": " + SECRET_RENEWABLE + ",\n" +
+            "    \"data\": {\n" +
+            "      \"data\": {\n" +
+            "          \"" + SECRET_DATA_K1 + "\": \"" + SECRET_DATA_V1 + "\",\n" +
+            "          \"" + SECRET_DATA_K2 + "\": \"" + SECRET_DATA_V2 + "\"\n" +
+            "      },\n" +
+            "      \"metadata\": {\n" +
+            "          \"created_time\": \"" + SECRET_META_CREATED + "\",\n" +
+            "          \"deletion_time\": \"\",\n" +
+            "          \"destroyed\": false,\n" +
+            "          \"version\": 1\n" +
+            "      }\n" +
+            "    },\n" +
+            "    \"warnings\": " + SECRET_WARNINGS + "\n" +
+            "}";
+    private static final String SECRET_JSON_V2_2 = "{\n" +
+            "    \"request_id\": \"" + SECRET_REQUEST_ID + "\",\n" +
+            "    \"lease_id\": \"" + SECRET_LEASE_ID + "\",\n" +
+            "    \"lease_duration\": " + SECRET_LEASE_DURATION + ",\n" +
+            "    \"renewable\": " + SECRET_RENEWABLE + ",\n" +
+            "    \"data\": {\n" +
+            "      \"data\": {\n" +
+            "          \"" + SECRET_DATA_K1 + "\": \"" + SECRET_DATA_V1 + "\",\n" +
+            "          \"" + SECRET_DATA_K2 + "\": \"" + SECRET_DATA_V2 + "\"\n" +
+            "      },\n" +
+            "      \"metadata\": {\n" +
+            "          \"created_time\": \"" + SECRET_META_CREATED + "\",\n" +
+            "          \"deletion_time\": \"" + SECRET_META_DELETED + "\",\n" +
+            "          \"destroyed\": true,\n" +
+            "          \"version\": 2\n" +
+            "      }\n" +
+            "    },\n" +
+            "    \"warnings\": " + SECRET_WARNINGS + "\n" +
+            "}";
 
 
     static {
@@ -102,16 +158,49 @@ public class SecretResponseTest {
     @Test
     public void jsonRoundtrip() {
         try {
-            SecretResponse res = new ObjectMapper().readValue(SECRET_JSON, SecretResponse.class);
-            assertThat("Parsed response is NULL", res, is(notNullValue()));
-            assertThat("Incorrect lease ID", res.getLeaseId(), is(SECRET_LEASE_ID));
-            assertThat("Incorrect lease duration", res.getLeaseDuration(), is(SECRET_LEASE_DURATION));
-            assertThat("Incorrect renewable status", res.isRenewable(), is(SECRET_RENEWABLE));
-            assertThat("Incorrect warnings", res.getWarnings(), is(SECRET_WARNINGS));
-            assertThat("Response does not contain correct data", res.get(SECRET_DATA_K1), is(SECRET_DATA_V1));
-            assertThat("Response does not contain correct data", res.get(SECRET_DATA_K2), is(SECRET_DATA_V2));
+            assertSecretData(new ObjectMapper().readValue(SECRET_JSON, SecretResponse.class));
+        } catch (IOException e) {
+            fail("SecretResponse deserialization failed: " + e.getMessage());
+        }
+
+        // KV v2 secret.
+        try {
+            SecretResponse res = new ObjectMapper().readValue(SECRET_JSON_V2, SecretResponse.class);
+            assertSecretData(res);
+            assertThat("SecretResponse does not contain metadata", res.getMetadata(), is(notNullValue()));
+            assertThat("Incorrect creation date string", res.getMetadata().getCreatedTimeString(), is(SECRET_META_CREATED));
+            assertThat("Creation date parsing failed", res.getMetadata().getCreatedTime(), is(notNullValue()));
+            assertThat("Incorrect deletion date string", res.getMetadata().getDeletionTimeString(), is(emptyString()));
+            assertThat("Incorrect deletion date", res.getMetadata().getDeletionTime(), is(nullValue()));
+            assertThat("Secret destroyed when not expected", res.getMetadata().isDestroyed(), is(false));
+            assertThat("Incorrect secret version", res.getMetadata().getVersion(), is(1));
+        } catch (IOException e) {
+            fail("SecretResponse deserialization failed: " + e.getMessage());
+        }
+
+        // Deleted KV v2 secret.
+        try {
+            SecretResponse res = new ObjectMapper().readValue(SECRET_JSON_V2_2, SecretResponse.class);
+            assertSecretData(res);
+            assertThat("SecretResponse does not contain metadata", res.getMetadata(), is(notNullValue()));
+            assertThat("Incorrect creation date string", res.getMetadata().getCreatedTimeString(), is(SECRET_META_CREATED));
+            assertThat("Creation date parsing failed", res.getMetadata().getCreatedTime(), is(notNullValue()));
+            assertThat("Incorrect deletion date string", res.getMetadata().getDeletionTimeString(), is(SECRET_META_DELETED));
+            assertThat("Incorrect deletion date", res.getMetadata().getDeletionTime(), is(notNullValue()));
+            assertThat("Secret destroyed when not expected", res.getMetadata().isDestroyed(), is(true));
+            assertThat("Incorrect secret version", res.getMetadata().getVersion(), is(2));
         } catch (IOException e) {
             fail("SecretResponse deserialization failed: " + e.getMessage());
         }
     }
+
+    private void assertSecretData(SecretResponse res) {
+        assertThat("Parsed response is NULL", res, is(notNullValue()));
+        assertThat("Incorrect lease ID", res.getLeaseId(), is(SECRET_LEASE_ID));
+        assertThat("Incorrect lease duration", res.getLeaseDuration(), is(SECRET_LEASE_DURATION));
+        assertThat("Incorrect renewable status", res.isRenewable(), is(SECRET_RENEWABLE));
+        assertThat("Incorrect warnings", res.getWarnings(), is(SECRET_WARNINGS));
+        assertThat("Response does not contain correct data", res.get(SECRET_DATA_K1), is(SECRET_DATA_V1));
+        assertThat("Response does not contain correct data", res.get(SECRET_DATA_K2), is(SECRET_DATA_V2));
+    }
 }

src/test/java/de/stklcode/jvault/connector/model/response/SecretVersionResponseTest.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.stklcode.jvault.connector.model.response;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * JUnit Test for {@link SecretVersionResponse} model.
+ *
+ * @author Stefan Kalscheuer
+ * @since 0.8
+ */
+public class SecretVersionResponseTest {
+    private static final String CREATION_TIME = "2018-03-22T02:24:06.945319214Z";
+    private static final String DELETION_TIME = "2018-03-22T02:36:43.986212308Z";
+    private static final Integer VERSION = 42;
+
+    private static final String META_JSON = "{\n" +
+            "  \"data\": {\n" +
+            "    \"created_time\": \"" + CREATION_TIME + "\",\n" +
+            "    \"deletion_time\": \"" + DELETION_TIME + "\",\n" +
+            "    \"destroyed\": false,\n" +
+            "    \"version\": " + VERSION + "\n" +
+            "  }\n" +
+            "}";
+
+    /**
+     * Test creation from JSON value as returned by Vault (JSON example copied from Vault documentation).
+     */
+    @Test
+    public void jsonRoundtrip() {
+        try {
+            SecretVersionResponse res = new ObjectMapper().readValue(META_JSON, SecretVersionResponse.class);
+            assertThat("Parsed response is NULL", res, is(notNullValue()));
+            assertThat("Parsed metadatra is NULL", res.getMetadata(), is(notNullValue()));
+            assertThat("Incorrect created time", res.getMetadata().getCreatedTimeString(), is(CREATION_TIME));
+            assertThat("Incorrect deletion time", res.getMetadata().getDeletionTimeString(), is(DELETION_TIME));
+            assertThat("Incorrect destroyed state", res.getMetadata().isDestroyed(), is(false));
+            assertThat("Incorrect version", res.getMetadata().getVersion(), is(VERSION));
+        } catch (IOException e) {
+            fail("SecretVersionResponse deserialization failed: " + e.getMessage());
+        }
+    }
+}

src/test/java/de/stklcode/jvault/connector/model/response/TokenResponseTest.java

@@ -1,17 +1,33 @@
+/*
+ * Copyright 2016-2019 Stefan Kalscheuer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package de.stklcode.jvault.connector.model.response;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import de.stklcode.jvault.connector.exception.InvalidResponseException;
 import de.stklcode.jvault.connector.model.response.embedded.TokenData;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.fail;
 
 /**
  * JUnit Test for {@link TokenResponse} model.

src/test/java/de/stklcode/jvault/connector/test/Credentials.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/test/java/de/stklcode/jvault/connector/test/VaultConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 Stefan Kalscheuer
+ * Copyright 2016-2019 Stefan Kalscheuer
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -92,7 +92,7 @@ public class VaultConfiguration {
 
     @Override
     public String toString() {
-        return "backend \"file\" {\n" +
+        return "storage \"file\" {\n" +
                 "  path = \"" + dataLocation + "\"\n" +
                 "}\n" +
                 "listener \"tcp\" {\n" +

src/test/resources/data_dir/auth/20e9c2e6-5b1f-b9c9-5a99-21667e0a899d/_salt

@@ -1 +0,0 @@
-{"Key":"auth/20e9c2e6-5b1f-b9c9-5a99-21667e0a899d/salt","Value":"AAAAAQJUsuXXEpmdNY5aIh5HdzZRTFpOUIgyKLGiw65DBwSXW6yGAYe/zhN/Ow+vyRZxG4temgnTjN7RVGjyzXGG5yLY"}

src/test/resources/data_dir/auth/20e9c2e6-5b1f-b9c9-5a99-21667e0a899d/struct/map/app-id/_19d90b9adcec2bf5088304034622a169a148ff43

@@ -1 +0,0 @@
-{"Key":"auth/20e9c2e6-5b1f-b9c9-5a99-21667e0a899d/struct/map/app-id/19d90b9adcec2bf5088304034622a169a148ff43","Value":"AAAAAQJuuRcCRinyawQ05brruZQY7ypgs1mOsFHI16XLwYB4dzwJob71wW+74RjvK4FVL4qPfgyMPKEtV2uO9+4hr2mC6BrcN///Ksxv+ns8FMVlBOMJpQ=="}

src/test/resources/data_dir/auth/20e9c2e6-5b1f-b9c9-5a99-21667e0a899d/struct/map/user-id/_55a852babe045b5980fc8ac4a13af27021dbbfd4

@@ -1 +0,0 @@
-{"Key":"auth/20e9c2e6-5b1f-b9c9-5a99-21667e0a899d/struct/map/user-id/55a852babe045b5980fc8ac4a13af27021dbbfd4","Value":"AAAAAQICaFIxG2xAq0AuJryVn1XghDulkVdQicXvhEL45K2S48aZcvMEsrDUXm9o427Bp6eMiq0Hw070nosnB9SWSQJEFUfPmM6I7Jhsou6CKmocs/AmocxY3Du4Lg=="}

src/test/resources/data_dir/auth/243a5842-b58f-24d5-d3b0-24304c57b7cc/user/_validuser

@@ -0,0 +1 @@
+{"Value":"AAAAAQINZKQEssY4IzHI/0k27nBtxSvnC6LkivYrqky6CblcjyAmQIg/4/cKQIBCXzmrWEv/SqMQbLw+4Lp63Xu1niF+U0NbyqDmFaPqnD2yfPs7meXvZr21+P9E/0APZMHQaSR7DIEY46zedHRjQ/pkhR2Axcjuy5gdfzBzC2XvUcNqdyR0pQwcDwGhAIdO0gxJfZCeBuvv8ceYS+aPs4gDHtIlA3szi+5qAQ8HvPBTDKQn1lHVYnzTdNbMS7v3mtzCyG8AeMkaUw=="}

src/test/resources/data_dir/auth/3ec9e5b4-41b0-a20c-cc8f-04c2b7bb2602/_salt

@@ -0,0 +1 @@
+{"Value":"AAAAAQJiN0bHxM8aNJpY7aHGZ/p3qOhJbd7JIXwFMEI4LtKmO6pP5Oa4P5z+2LK+2qzZhhX/iDeM4u+nR+lxt/GsBPKf"}

src/test/resources/data_dir/auth/3ec9e5b4-41b0-a20c-cc8f-04c2b7bb2602/accessor/_a9566f93ca05120fa8955f887ee0ca1a1422802df2ad979f2ac2951e95703089

@@ -0,0 +1 @@
+{"Value":"AAAAAQIZ5rvzLtBcBQvWqwwDoRADwUo6W0ECKgmcvXejbLKiYcbO0hP8fceCqB12J41wxcMViQ8vvWoIgyOX2HwcZS09GGCqQbjvyVfz/w+kyox9dJzr845f26tJjHVYlHX2YFsnxytwe5qCKdCsD5QP9kyz8J0="}

src/test/resources/data_dir/auth/3ec9e5b4-41b0-a20c-cc8f-04c2b7bb2602/role/_testrole1

@@ -0,0 +1 @@
+{"Value":"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"}

src/test/resources/data_dir/auth/3ec9e5b4-41b0-a20c-cc8f-04c2b7bb2602/role/_testrole2

@@ -0,0 +1 @@
+{"Value":"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"}

src/test/resources/data_dir/auth/3ec9e5b4-41b0-a20c-cc8f-04c2b7bb2602/role_id/_4b3d052da8b3d9af8d551a4e515289bc4319f2c21012a70de2c9e9fea6e0f7e0

@@ -0,0 +1 @@
+{"Value":"AAAAAQKv0Yr+QFSWxYe8o51TBwGz/yAhNYFmkNHPISEK6EbIVGkpEJMHFYvHWxTXUzF7f2/a"}

src/test/resources/data_dir/auth/3ec9e5b4-41b0-a20c-cc8f-04c2b7bb2602/role_id/_c779a2e6599b8e4b6b6a3c68a7690a8e7d31fa0201ad73973dcd24f83e2950de

@@ -0,0 +1 @@
+{"Value":"AAAAAQKs2/ICwQPLv6siBGDbBnB52fBVo52BkSKGvm74p4oHrdMEvejJ4cJljOADYyDT2QYa"}

src/test/resources/data_dir/auth/3ec9e5b4-41b0-a20c-cc8f-04c2b7bb2602/secret_id/c79a3b6ce2e8e8b725c8c0fcdd23521375fadf2190fb5823d459a2fd2cb5a670/_f5954e87c0b1a0eb9c8fa4fc2ed7ab6f4338a8d77341e06460de0870316e7320

@@ -0,0 +1 @@
+{"Value":"AAAAAQIq05o3NmsucipTxPrcRbT1sXpAJ8w2PpiShnof74Kuzf/4kkHj3AZL5AObGFLAkYUvUrv3RRmYBIhw6Jk4FCbgdQyJAjPNVUTwBun/kQVyzP5sQ9hUFgHJwINomtVDiDgPkOc92zk8ydr1hfnMmTAtS71G3xloHDn6CF/1Y9WI1PkHdSkZ8d+yBNxr+qjGyewrV3QVmQvAfpY56uQ6AOztItD9NgiPrtNP+clbCczsieY6Y9Ce2FZawmuKFi9svMcBtnEcMILV/SGt4iCiMgFwkCJ9gQsGEdWPifu6ITPB92LgT4Ccw4gVRO31QVcPl6S+FG6iCeN6lk2yRXYjyhBuU+GklouEZIsA6SoxlIXPZuvauyS1MWwMxtSOQUFVYr3kvtXzCpcpEHDyBOEUdxPaYUZXHNdhGtMr/JuJCN50t0ng5mEAqfhjoJfJ/tBTqAjySj4zmEHuY0RnqYLPmsp203Q="}

src/test/resources/data_dir/auth/6802ec63-11b0-0ccc-280a-982ad0a90621/user/_validuser

@@ -1 +0,0 @@
-{"Key":"auth/6802ec63-11b0-0ccc-280a-982ad0a90621/user/validuser","Value":"AAAAAQJwFKMpgopAFjJaftTVY/iiawMw4Yj0S3pPDkzMPAfLxxaM3sCjOJt0q/07ozjTharT52wBv+s2ZEurPpr7VKDDzgy4xTMxFJbJs+0VkG3cjxRYEfW3bOIVAHhjLjmxZwYEATh0UUG7bQRNt56+/622bwR99ifWZ6e9zyRDGEwIn74JFN/3dY44qLQZmqfvDUrRQP5RfqDxqVdzbwse61s692Vy/QvlPsRFVRTkZHlNPqxT+OXd"}

src/test/resources/data_dir/auth/77603e3c-3db8-2d39-0e51-6c8eee76c3d5/_salt

@@ -0,0 +1 @@
+{"Value":"AAAAAQK5U1GclNj+Tga7D4bQ5wExYfVu2y+djHlAlhiJ/JHOS1gS0G/kDrjR8gCdg/Aw2UunrObAq/mrKw0HEe1wo2qA"}

src/test/resources/data_dir/auth/77603e3c-3db8-2d39-0e51-6c8eee76c3d5/struct/map/app-id/_sfbe1922bae1f565115b4b933d76152e1a098ab507118283971184d58528e3411

@@ -0,0 +1 @@
+{"Value":"AAAAAQLbvc+neI458Mqhl2WUUjY5HMC1Ast0KjZ5pslwW+5TtjVHcqdzls4whrrYHGUWv+nTg6wxJaS46j5+FER+4gsgWVJE1S33ZqvGtmmueCVpac5ZM0biBDXOvE/YFQ=="}

src/test/resources/data_dir/auth/77603e3c-3db8-2d39-0e51-6c8eee76c3d5/struct/map/user-id/_s595229a9e81315fd0a5fb274f504622359e6024477ade54db93e36ca3b7801cf

@@ -0,0 +1 @@
+{"Value":"AAAAAQIK4FkvUHPiWUfHY7l9lGW1qf+sU2mAIWbjlfSvEIecbg94Mu4KAPxY3E2YLwOs7VyPZtWNZrZAZDMJJJzxM/pLux2o/IctJ5oXGtfPPjTjwNRRJ4U62wpRqBnBGX4="}

src/test/resources/data_dir/auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/_salt

@@ -1 +0,0 @@
-{"Key":"auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/salt","Value":"AAAAAQKDLmmb/XlhfVJ45oKGyYwneS9s3tcQUenB8bTcxuDmAMUWnwG8oNNJFs0mSCF9Yv1KOq3Twxj4qPp05viFnP0z"}

src/test/resources/data_dir/auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/accessor/_da42ddc9a483efd8ddeae4ab38428f73d42ad7f6320705f333555fed8593cbe2

@@ -1 +0,0 @@
-{"Key":"auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/accessor/da42ddc9a483efd8ddeae4ab38428f73d42ad7f6320705f333555fed8593cbe2","Value":"AAAAAQLCu78fbRRgGWG++5XDCfaO/8NTg7LMAJL7aCsrn6c1WHJ5yrAAmWmSs1euhNd7yKUd0lQ0aknCKdPAZFBlAsqgOdnN8JLFe/H9lISaWdU6lRIfgTH9whEXWT0VK25FcS4r5yVe3Qoxg0DfT8FhjuzOa70="}

src/test/resources/data_dir/auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/accessor/_e83aed0dd0b867f09aa1dbc88b965eafba6030458d6555712e82c479cee3d2d7

@@ -1 +0,0 @@
-{"Key":"auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/accessor/e83aed0dd0b867f09aa1dbc88b965eafba6030458d6555712e82c479cee3d2d7","Value":"AAAAAQL7t56z9Fr92ztubIfZPPkV3X1Aljnn95Y/tDXOxn8vjbjf21Fhyj3UnLwWyzK/9ip/6+x2DJBXikBOvXoCqKLXGegZ4JN9Z9UMiQ88aE9Z978r13E/rNbhIUa/PhT5NGwCbOl6vtK2hL06BHxKb+4+goM="}

src/test/resources/data_dir/auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/accessor/_e96c348451147331101ad48e157e8056ca1b039ee63a6aafd2d66446c94bcad8

@@ -1 +0,0 @@
-{"Key":"auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/accessor/e96c348451147331101ad48e157e8056ca1b039ee63a6aafd2d66446c94bcad8","Value":"AAAAAQIcvMn5QMtwELRDXZD9nNf7y/8O6z7u0NUZqyJrBb2OYDRvGpSuPS3CIareSxl8y5F4xtadvhyhunCGBUd289H9foMjfGbVVsM1mbM5i6FDTW0sFOPmXX44mQV29PVNMO+fcLuSWb0+qU4erqylpcvdLW8="}

src/test/resources/data_dir/auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/role/_testrole1

@@ -1 +0,0 @@
-{"Key":"auth/ac4e0527-a7b2-1b40-1148-dc0dfaf01990/role/testrole1","Value":"AAAAAQLyV03lH8m3IYxoZKLf+/suZ+2wwKAyIHqrR3QeJZK+68wslLXy0XZ35bPrdc3jzAFhTizqILlgTBHVccdM/pydtTtbsvGHQlWstLaC79GUTM32gS/jwSrbwfa9j0q/Yrdo2LSa9IM5lw2tmYy+xR9c3ZKcm+VADZMZy3+6UmbQ1t0lniZ4uuVmqu2gl3y0732UtdMSxJepPWMjfvVq5+tynhgvEZNGgZCPc9lsV1fcBVFswtBUeATNnSJPmTnxQflXyhitPOpEM+5L+gnEsSNsyinRjv5cSbIHCP5yDzvpiWtwZ5Q0psVRSh/WJppBHcovwbJsTLK/tZ1wtFl1OgU9NLONEpgDJYiDyU0ACeFJ7r+DhjIDrQkr+WITnfBBwI+65wpOPYboqGgd4qZy84PE2s/VhWS5hjpxgpM="}