Added WireMockConfigurationCustomizer

with this change it's possible to customize the WireMockConfiguration set up by Spring Cloud Contract

fixes gh-502

docs/src/main/asciidoc/spring-cloud-wiremock.adoc

@@ -160,6 +160,19 @@ Spring Boot embedded servers, and Wiremock itself has "native" support for a par
 version of Jetty (currently 9.2). To use the native Jetty, you need to add the native
 Wiremock dependencies and exclude the Spring Boot container (if there is one).
 
+=== Customization of WireMock configuration
+
+You can register a bean of `org.springframework.cloud.contract.wiremock.WireMockConfigurationCustomizer` type
+in order to customize the WireMock configuration (e.g. add custom transformers).
+Example:
+
+[source,java,indent=0]
+----
+include::{wiremock_tests}/src/test/java/org/springframework/cloud/contract/wiremock/AutoConfigureWireMockConfigurationCustomizerTests.java[tags=customizer_1]
+// perform your customization here
+include::{wiremock_tests}/src/test/java/org/springframework/cloud/contract/wiremock/AutoConfigureWireMockConfigurationCustomizerTests.java[tags=customizer_2]
+----
+
 === Generating Stubs using REST Docs
 
 https://projects.spring.io/spring-restdocs[Spring REST Docs] can be used to generate

spring-cloud-contract-wiremock/src/main/java/org/springframework/cloud/contract/wiremock/WireMockConfiguration.java

@@ -62,6 +62,9 @@ public class WireMockConfiguration implements SmartLifecycle {
 	@Autowired(required = false)
 	private Options options;
 
+	@Autowired(required = false)
+	private WireMockConfigurationCustomizer customizer;
+
 	@Autowired
 	private DefaultListableBeanFactory beanFactory;
 
@@ -84,6 +87,9 @@ public class WireMockConfiguration implements SmartLifecycle {
 			registerFiles(factory);
 			factory.notifier(new Slf4jNotifier(true));
 			this.options = factory;
+			if (this.customizer != null) {
+				this.customizer.customize(factory);
+			}
 		}
 		this.server = new WireMockServer(this.options);
 		registerStubs();

spring-cloud-contract-wiremock/src/main/java/org/springframework/cloud/contract/wiremock/WireMockConfigurationCustomizer.java

@@ -0,0 +1,12 @@
+package org.springframework.cloud.contract.wiremock;
+
+/**
+ * Allows customization of {@link com.github.tomakehurst.wiremock.core.WireMockConfiguration}
+ *
+ * @author Marcin Grzejszczak
+ * @since 1.2.2
+ */
+public interface WireMockConfigurationCustomizer {
+
+	void customize(com.github.tomakehurst.wiremock.core.WireMockConfiguration config);
+}

spring-cloud-contract-wiremock/src/test/java/org/springframework/cloud/contract/wiremock/AutoConfigureWireMockConfigurationCustomizerTests.java

@@ -0,0 +1,58 @@
+package org.springframework.cloud.contract.wiremock;
+
+import com.github.tomakehurst.wiremock.core.WireMockConfiguration;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes={WiremockTestsApplication.class,
+		AutoConfigureWireMockConfigurationCustomizerTests.Config.class},
+		properties="app.baseUrl=http://localhost:${wiremock.server.port}",
+		webEnvironment=WebEnvironment.NONE)
+@DirtiesContext
+@AutoConfigureWireMock(port=0, stubs="file:src/test/resources/io.stubs/mappings")
+public class AutoConfigureWireMockConfigurationCustomizerTests {
+
+	@Autowired
+	private Service service;
+	@Autowired
+	private Config config;
+
+	@Test
+	public void contextLoads() throws Exception {
+		assertThat(this.service.go()).isEqualTo("Hello World");
+		assertThat(this.config.isExecuted()).isTrue();
+	}
+
+	@Configuration
+	protected static class Config {
+
+		boolean executed = false;
+
+		// tag::customizer_1[]
+		@Bean WireMockConfigurationCustomizer optionsCustomizer() {
+			return new WireMockConfigurationCustomizer() {
+				@Override public void customize(WireMockConfiguration options) {
+					// end::customizer_1[]
+					assertThat(options.portNumber()).isGreaterThan(0);
+					Config.this.executed = true;
+					// tag::customizer_2[]
+				}
+			};
+		}
+		// end::customizer_2[]
+
+		public boolean isExecuted() {
+			return executed;
+		}
+	}
+}

spring-cloud-contract-wiremock/src/test/java/org/springframework/cloud/contract/wiremock/WiremockTestsApplication.java

@@ -57,4 +57,8 @@ class Service {
 	public String go() {
 		return this.restTemplate.getForEntity(this.base + "/test", String.class).getBody();
 	}
+
+	public void setBase(String base) {
+		this.base = base;
+	}
 }