au.com.dius : pact-jvm-provider-maven

pact-jvm-provider-maven · Maven plugin to verify a provider ================================= Maven plugin for verifying pacts against a provider. The Maven plugin provides a `verify` goal which will verify all configured pacts against your provider. ## To Use It ### 1. Add the pact-jvm-provider-maven plugin to your `build` section of your pom file. ```xml <build> [...] <plugins> [...] <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> </plugin> [...] </plugins> [...] </build> ``` ### 2. Define the pacts between your consumers and providers You define all the providers and consumers within the configuration element of the maven plugin. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <!-- You can define as many as you need, but each must have a unique name --> <serviceProvider> <name>provider1</name> <!-- All the provider properties are optional, and have sensible defaults (shown below) --> <protocol>http</protocol> <host>localhost</host> <port>8080</port> <path>/</path> <consumers> <!-- Again, you can define as many consumers for each provider as you need, but each must have a unique name --> <consumer> <name>consumer1</name> <!-- currently supports a file path using pactFile or a URL using pactUrl --> <pactFile>path/to/provider1-consumer1-pact.json</pactFile> </consumer> </consumers> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` ### 3. Execute `mvn pact:verify` You will have to have your provider running for this to pass. ## Verifying all pact files in a directory for a provider You can specify a directory that contains pact files, and the Pact plugin will scan for all pact files that match that provider and define a consumer for each pact file in the directory. Consumer name is read from contents of pact file. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <!-- You can define as many as you need, but each must have a unique name --> <serviceProvider> <name>provider1</name> <!-- All the provider properties are optional, and have sensible defaults (shown below) --> <protocol>http</protocol> <host>localhost</host> <port>8080</port> <path>/</path> <pactFileDirectory>path/to/pacts</pactFileDirectory> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` ### Verifying all pact files from multiple directories for a provider If you want to specify multiple directories, you can use `pactFileDirectories`. The plugin will only fail the build if no pact files are loaded after processing all the directories in the list. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <pactFileDirectories> <pactFileDirectory>path/to/pacts1</pactFileDirectory> <pactFileDirectory>path/to/pacts2</pactFileDirectory> </pactFileDirectories> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` ## Enabling insecure SSL For providers that are running on SSL with self-signed certificates, you need to enable insecure SSL mode by setting `<insecure>true</insecure>` on the provider. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <pactFileDirectory>path/to/pacts</pactFileDirectory> <insecure>true</insecure> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` ## Specifying a custom trust store For environments that are running their own certificate chains: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <pactFileDirectory>path/to/pacts</pactFileDirectory> <trustStore>relative/path/to/trustStore.jks</trustStore> <trustStorePassword>changeit</trustStorePassword> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` `trustStore` is either relative to the current working (build) directory. `trustStorePassword` defaults to `changeit`. NOTE: The hostname will still be verified against the certificate. ## Modifying the requests before they are sent Sometimes you may need to add things to the requests that can't be persisted in a pact file. Examples of these would be authentication tokens, which have a small life span. The Pact Maven plugin provides a request filter that can be set to a Groovy script on the provider that will be called before the request is made. This script will receive the HttpRequest bound to a variable named `request` prior to it being executed. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <requestFilter> // This is a Groovy script that adds an Authorization header to each request request.addHeader('Authorization', 'oauth-token eyJhbGciOiJSUzI1NiIsIm...') </requestFilter> <consumers> <consumer> <name>consumer1</name> <pactFile>path/to/provider1-consumer1-pact.json</pactFile> </consumer> </consumers> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` __*Important Note:*__ You should only use this feature for things that can not be persisted in the pact file. By modifying the request, you are potentially modifying the contract from the consumer tests! ## Modifying the HTTP Client Used The default HTTP client is used for all requests to providers (created with a call to `HttpClients.createDefault()`). This can be changed by specifying a closure assigned to createClient on the provider that returns a CloseableHttpClient. For example: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <createClient> // This is a Groovy script that will enable the client to accept self-signed certificates import org.apache.http.ssl.SSLContextBuilder import org.apache.http.conn.ssl.NoopHostnameVerifier import org.apache.http.impl.client.HttpClients HttpClients.custom().setSSLHostnameVerifier(new NoopHostnameVerifier()) .setSslcontext(new SSLContextBuilder().loadTrustMaterial(null, { x509Certificates, s -> true }) .build()) .build() </createClient> <consumers> <consumer> <name>consumer1</name> <pactFile>path/to/provider1-consumer1-pact.json</pactFile> </consumer> </consumers> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` ## Turning off URL decoding of the paths in the pact file By default the paths loaded from the pact file will be decoded before the request is sent to the provider. To turn this behaviour off, set the system property `pact.verifier.disableUrlPathDecoding` to `true`. __*Important Note:*__ If you turn off the url path decoding, you need to ensure that the paths in the pact files are correctly encoded. The verifier will not be able to make a request with an invalid encoded path. ## Plugin Properties The following plugin properties can be specified with `-Dproperty=value` on the command line or in the configuration section: |Property|Description| |--------|-----------| |`pact.showStacktrace`|This turns on stacktrace printing for each request. It can help with diagnosing network errors| |`pact.showFullDiff`|This turns on displaying the full diff of the expected versus actual bodies| |`pact.filter.consumers`|Comma separated list of consumer names to verify| |`pact.filter.description`|Only verify interactions whose description match the provided regular expression| |`pact.filter.providerState`|Only verify interactions whose provider state match the provided regular expression. An empty string matches interactions that have no state| |`pact.filter.pacturl`|This filter allows just the just the changed pact specified in a webhook to be run. It should be used in conjunction with `pact.filter.consumers`| |`pact.verifier.publishResults`|Publishing of verification results will be skipped unless this property is set to `true` [version 3.5.18+]| |`pact.matching.wildcard`|Enables matching of map values ignoring the keys when this property is set to `true`| |`pact.verifier.disableUrlPathDecoding`|Disables decoding of request paths| |`pact.pactbroker.httpclient.usePreemptiveAuthentication`|Enables preemptive authentication with the pact broker when set to `true`| |`pact.consumer.tags`|Overrides the tags used when publishing pacts [version 4.0.7+]| Example in the configuration section: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <consumers> <consumer> <name>consumer1</name> <pactFile>path/to/provider1-consumer1-pact.json</pactFile> </consumer> </consumers> </serviceProvider> </serviceProviders> <configuration> <pact.showStacktrace>true</pact.showStacktrace> </configuration> </configuration> </plugin> ``` ## Provider States For each provider you can specify a state change URL to use to switch the state of the provider. This URL will receive the providerState description and parameters from the pact file before each interaction via a POST. The stateChangeUsesBody controls if the state is passed in the request body or as query parameters. These values can be set at the provider level, or for a specific consumer. Consumer values take precedent if both are given. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <stateChangeUrl>http://localhost:8080/tasks/pactStateChange</stateChangeUrl> <stateChangeUsesBody>false</stateChangeUsesBody> <!-- defaults to true --> <consumers> <consumer> <name>consumer1</name> <pactFile>path/to/provider1-consumer1-pact.json</pactFile> <stateChangeUrl>http://localhost:8080/tasks/pactStateChangeForConsumer1</stateChangeUrl> <stateChangeUsesBody>false</stateChangeUsesBody> <!-- defaults to true --> </consumer> </consumers> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` If the `stateChangeUsesBody` is not specified, or is set to true, then the provider state description and parameters will be sent as JSON in the body of the request. If it is set to false, they will passed as query parameters. As for normal requests (see Modifying the requests before they are sent), a state change request can be modified before it is sent. Set `stateChangeRequestFilter` to a Groovy script on the provider that will be called before the request is made. #### Teardown calls for state changes You can enable teardown state change calls by setting the property `<stateChangeTeardown>true</stateChangeTeardown>` on the provider. This will add an `action` parameter to the state change call. The setup call before the test will receive `action=setup`, and then a teardown call will be made afterwards to the state change URL with `action=teardown`. #### Returning values that can be injected (3.6.11+) You can have values from the provider state callbacks be injected into most places (paths, query parameters, headers, bodies, etc.). This works by using the V3 spec generators with provider state callbacks that return values. One example of where this would be useful is API calls that require an ID which would be auto-generated by the database on the provider side, so there is no way to know what the ID would be beforehand. There are methods on the consumer DSLs that can provider an expression that contains variables (like '/api/user/${id}' for the path). The provider state callback can then return a map for values, and the `id` attribute from the map will be expanded in the expression. For URL callbacks, the values need to be returned as JSON in the response body. ## Verifying pact files from a pact broker You can setup your build to validate against the pacts stored in a pact broker. The pact plugin will query the pact broker for all consumers that have a pact with the provider based on its name. To use it, just configure the `pactBrokerUrl` or `pactBroker` value for the provider with the base URL to the pact broker. For example: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <stateChangeUrl>http://localhost:8080/tasks/pactStateChange</stateChangeUrl> <pactBrokerUrl>http://pact-broker:5000/</pactBrokerUrl> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` ### Verifying pacts from an authenticated pact broker If your pact broker requires authentication (basic and bearer authentication are supported), you can configure the username and password to use by configuring the `authentication` element of the `pactBroker` element of your provider. For example, here is how you configure the plugin to use basic authentication for verifying pacts: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.1</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <stateChangeUrl>http://localhost:8080/tasks/pactStateChange</stateChangeUrl> <pactBroker> <url>http://pactbroker:1234</url> <authentication> <scheme>basic</scheme> <username>test</username> <password>test</password> </authentication> </pactBroker> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` Here is how you configure the plugin to use bearer token authentication for verifying pacts ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.1</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <stateChangeUrl>http://localhost:8080/tasks/pactStateChange</stateChangeUrl> <pactBroker> <url>http://pactbroker:1234</url> <authentication> <scheme>bearer</scheme> <token>TOKEN</token> </authentication> </pactBroker> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` Preemptive Authentication can be enabled by setting the `pact.pactbroker.httpclient.usePreemptiveAuthentication` Java system property to `true`. ### Allowing just the changed pact specified in a webhook to be verified [4.0.6+] When a consumer publishes a new version of a pact file, the Pact broker can fire off a webhook with the URL of the changed pact file. To allow only the changed pact file to be verified, you can override the URL by using the `pact.filter.consumers` and `pact.filter.pacturl` Java system properties. For example, running: ```console mvn pact:verify -Dpact.filter.consumers='Foo Web Client' -Dpact.filter.pacturl=https://test.pact.dius.com.au/pacts/provider/Activity%20Service/consumer/Foo%20Web%20Client/version/1.0.1 ``` will only run the verification for Foo Web Client with the given pact file URL. #### Using the Maven servers configuration You can use the servers setup in the Maven settings. To do this, setup a server as per the [Maven Server Settings](https://maven.apache.org/settings.html#Servers). Then set the server ID in the pact broker configuration in your POM. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <stateChangeUrl>http://localhost:8080/tasks/pactStateChange</stateChangeUrl> <pactBroker> <url>http://pactbroker:1234</url> <serverId>test-pact-broker</serverId> <!-- This must match the server id in the maven settings --> </pactBroker> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` ### Verifying pacts from an pact broker that match particular tags If your pacts in your pact broker have been tagged, you can set the tags to fetch by configuring the `tags` element of the `pactBroker` element of your provider. For example: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>provider1</name> <stateChangeUrl>http://localhost:8080/tasks/pactStateChange</stateChangeUrl> <pactBroker> <url>http://pactbroker:1234</url> <tags> <tag>TEST</tag> <tag>DEV</tag> </tags> </pactBroker> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` This example will fetch and validate the pacts for the TEST and DEV tags. ## Filtering the interactions that are verified You can filter the interactions that are run using three properties: `pact.filter.consumers`, `pact.filter.description` and `pact.filter.providerState`. Adding `-Dpact.filter.consumers=consumer1,consumer2` to the command line or configuration section will only run the pact files for those consumers (consumer1 and consumer2). Adding `-Dpact.filter.description=a request for payment.*` will only run those interactions whose descriptions start with 'a request for payment'. `-Dpact.filter.providerState=.*payment` will match any interaction that has a provider state that ends with payment, and `-Dpact.filter.providerState=` will match any interaction that does not have a provider state. ## Not failing the build if no pact files are found By default, if there are no pact files to verify, the plugin will raise an exception. This is to guard against false positives where the build is passing but nothing has been verified due to mis-configuration. To disable this behaviour, set the `failIfNoPactsFound` parameter to `false`. # Verifying a message provider The Maven plugin has been updated to allow invoking test methods that can return the message contents from a message producer. To use it, set the way to invoke the verification to `ANNOTATED_METHOD`. This will allow the pact verification task to scan for test methods that return the message contents. Add something like the following to your maven pom file: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>messageProvider</name> <verificationType>ANNOTATED_METHOD</verificationType> <!-- packagesToScan is optional, but leaving it out will result in the entire test classpath being scanned. Set it to the packages where your annotated test method can be found. --> <packagesToScan> <packageToScan>au.com.example.messageprovider.*</packageToScan> </packagesToScan> <consumers> <consumer> <name>consumer1</name> <pactFile>path/to/messageprovider-consumer1-pact.json</pactFile> </consumer> </consumers> </serviceProvider> </serviceProviders> </configuration> </plugin> ``` Now when the pact verify task is run, will look for methods annotated with `@PactVerifyProvider` in the test classpath that have a matching description to what is in the pact file. ```groovy class ConfirmationKafkaMessageBuilderTest { @PactVerifyProvider('an order confirmation message') String verifyMessageForOrder() { Order order = new Order() order.setId(10000004) order.setExchange('ASX') order.setSecurityCode('CBA') order.setPrice(BigDecimal.TEN) order.setUnits(15) order.setGst(new BigDecimal('15.0')) odrer.setFees(BigDecimal.TEN) def message = new ConfirmationKafkaMessageBuilder() .withOrder(order) .build() JsonOutput.toJson(message) } } ``` It will then validate that the returned contents matches the contents for the message in the pact file. ## Changing the class path that is scanned By default, the test classpath is scanned for annotated methods. You can override this by setting the `classpathElements` property: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <serviceProviders> <serviceProvider> <name>messageProvider</name> <verificationType>ANNOTATED_METHOD</verificationType> <consumers> <consumer> <name>consumer1</name> <pactFile>path/to/messageprovider-consumer1-pact.json</pactFile> </consumer> </consumers> </serviceProvider> </serviceProviders> <classpathElements> <classpathElement> build/classes/test </classpathElement> </classpathElements> </configuration> </plugin> ``` # Publishing pact files to a pact broker The pact maven plugin provides a `publish` mojo that can publish all pact files in a directory to a pact broker. To use it, you need to add a publish configuration to the POM that defines the directory where the pact files are and the URL to the pact broker. For example: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <pactDirectory>path/to/pact/files</pactDirectory> <!-- Defaults to ${project.build.directory}/pacts --> <pactBrokerUrl>http://pactbroker:1234</pactBrokerUrl> <projectVersion>1.0.100</projectVersion> <!-- Defaults to ${project.version} --> <trimSnapshot>true</trimSnapshot> <!-- Defaults to false --> <skipPactPublish>false</skipPactPublish> <!-- Defaults to false --> </configuration> </plugin> ``` You can now execute `mvn pact:publish` to publish the pact files. _NOTE:_ The pact broker requires a version for all published pacts. The `publish` task will use the version of the project by default, but can be overwritten with the `projectVersion` property. Make sure you have set one otherwise the broker will reject the pact files. _NOTE_: By default, the pact broker has issues parsing `SNAPSHOT` versions. You can configure the publisher to automatically remove `-SNAPSHOT` from your version number by setting `trimSnapshot` to true. This setting does not modify non-snapshot versions. You can set any tags that the pacts should be published with by setting the `tags` list property. A common use of this is setting the tag to the current source control branch. This supports using pact with feature branches. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <pactDirectory>path/to/pact/files</pactDirectory> <!-- Defaults to ${project.build.directory}/pacts --> <pactBrokerUrl>http://pactbroker:1234</pactBrokerUrl> <projectVersion>1.0.100</projectVersion> <!-- Defaults to ${project.version} --> <tags> <tag>feature/feature_name</tag> </tags> </configuration> </plugin> ``` You can also specify the tags using the `pact.consumer.tags` Java system property [version 4.0.7+]. ## Publishing to an authenticated pact broker For an authenticated pact broker, you can pass in the credentials with the `pactBrokerUsername` and `pactBrokerPassword` properties. Currently it only supports basic authentication. For example: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <pactBrokerUrl>http://pactbroker:1234</pactBrokerUrl> <pactBrokerUsername>USERNAME</pactBrokerUsername> <pactBrokerPassword>PASSWORD</pactBrokerPassword> </configuration> </plugin> ``` Or to use a bearer token: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven_2.12</artifactId> <version>3.5.11</version> <configuration> <pactBrokerUrl>http://pactbroker:1234</pactBrokerUrl> <pactBrokerToken>TOKEN</pactBrokerToken> <!-- Replace TOKEN with the actual token --> <pactBrokerAuthenticationScheme>Bearer</pactBrokerAuthenticationScheme> </configuration> </plugin> ``` #### Using the Maven servers configuration You can use the servers setup in the Maven settings. To do this, setup a server as per the [Maven Server Settings](https://maven.apache.org/settings.html#Servers). Then set the server ID in the pact broker configuration in your POM. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <pactBrokerUrl>http://pactbroker:1234</pactBrokerUrl> <pactBrokerServerId>test-pact-broker</pactBrokerServerId> <!-- This must match the server id in the maven settings --> </configuration> </plugin> ``` ## Excluding pacts from being published You can exclude some of the pact files from being published by providing a list of regular expressions that match against the base names of the pact files. For example: ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <pactBrokerUrl>http://pactbroker:1234</pactBrokerUrl> <excludes> <exclude>.*\\-\\d+$</exclude> <!-- exclude pact files where the name ends in a dash followed by a number --> </excludes> </configuration> </plugin> ``` # Publishing verification results to a Pact Broker For pacts that are loaded from a Pact Broker, the results of running the verification can be published back to the broker against the URL for the pact. You will be able to then see the result on the Pact Broker home screen. To turn on the verification publishing, set the system property `pact.verifier.publishResults` to `true` in the pact maven plugin, not surefire, configuration. ## Tagging the provider before verification results are published [4.0.1+] You can have a tag pushed against the provider version before the verification results are published. To do this you need set the `pact.provider.tag` JVM system property to the tag value. # Enabling other verification reports By default the verification report is written to the console. You can also enable a JSON or Markdown report by setting the `reports` configuration list. ```xml <plugin> <groupId>au.com.dius</groupId> <artifactId>pact-jvm-provider-maven</artifactId> <version>4.0.0</version> <configuration> <reports> <report>console</report> <report>json</report> <report>markdown</report> </reports> </configuration> </plugin> ``` These reports will be written to `target/reports/pact`.