Generate stubs at runtime (#1152)

* Generate stubs at runtime

without this change the producer side must publish the stubs for the consumer side to use them
with this change the consumer can toggle a switch so that the stubs get generated at runtime. This might of course lead to false positivies but we assume that the users know what they're doing

fixes gh-881

spring-cloud-contract-tools/spring-cloud-contract-converters/src/main/groovy/org/springframework/cloud/contract/verifier/converter/StubGenerator.groovy

@@ -1,54 +0,0 @@
-/*
- * Copyright 2013-2019 the original author or authors.
- *
- * 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
- *
- *      https://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 org.springframework.cloud.contract.verifier.converter
-
-import groovy.transform.CompileStatic
-
-import org.springframework.cloud.contract.spec.Contract
-import org.springframework.cloud.contract.verifier.file.ContractMetadata
-
-/**
- * Converts contracts into their stub representation.
- *
- * @since 1.1.0
- */
-@CompileStatic
-interface StubGenerator {
-
-	/**
-	 * @return {@code true} if the converter can handle the file to convert it into a stub.
-	 */
-	boolean canHandleFileName(String fileName)
-
-	/**
-	 * @return the collection of converted contracts into stubs. One contract can
-	 * result in multiple stubs.
-	 */
-	Map<Contract, String> convertContents(String rootName, ContractMetadata content)
-
-	/**
-	 * @return the name of the converted stub file. If you have multiple contracts
-	 * in a single file then a prefix will be added to the generated file. If you
-	 * provide the {@link Contract#name} field then that field will override the
-	 * generated file name.
-	 *
-	 * Example: name of file with 2 contracts is {@code foo.groovy}, it will be
-	 * converted by the implementation to {@code foo.json}. The recursive file
-	 * converter will create two files {@code 0_foo.json} and {@code 1_foo.json}
-	 */
-	String generateOutputFileNameForInput(String inputFileName)
-}

spring-cloud-contract-tools/spring-cloud-contract-converters/src/main/groovy/org/springframework/cloud/contract/verifier/converter/StubGenerator.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2013-2019 the original author or authors.
+ *
+ * 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
+ *
+ *      https://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 org.springframework.cloud.contract.verifier.converter;
+
+import java.util.Map;
+
+import org.springframework.cloud.contract.spec.Contract;
+import org.springframework.cloud.contract.verifier.file.ContractMetadata;
+
+/**
+ * Converts contracts into their stub representation.
+ *
+ * @since 1.1.0
+ */
+public interface StubGenerator {
+
+	/**
+	 * @param fileName - file name
+	 * @return {@code true} if the converter can handle the file to convert it into a
+	 * stub.
+	 */
+	default boolean canHandleFileName(String fileName) {
+		return fileName.endsWith(fileExtension());
+	}
+
+	/**
+	 * @param rootName - root name of the contract
+	 * @param content - metadata of the contract
+	 * @return the collection of converted contracts into stubs. One contract can result
+	 * in multiple stubs.
+	 */
+	Map<Contract, String> convertContents(String rootName, ContractMetadata content);
+
+	/**
+	 * @param inputFileName - name of the input file
+	 * @return the name of the converted stub file. If you have multiple contracts in a
+	 * single file then a prefix will be added to the generated file. If you provide the
+	 * {@link Contract#name} field then that field will override the generated file name.
+	 *
+	 * Example: name of file with 2 contracts is {@code foo.groovy}, it will be converted
+	 * by the implementation to {@code foo.json}. The recursive file converter will create
+	 * two files {@code 0_foo.json} and {@code 1_foo.json}
+	 */
+	String generateOutputFileNameForInput(String inputFileName);
+
+	/**
+	 * Describes the file extension that this stub generator can handle.
+	 * @return string describing the file extension
+	 */
+	default String fileExtension() {
+		return ".json";
+	}
+
+}

spring-cloud-contract-tools/spring-cloud-contract-converters/src/main/groovy/org/springframework/cloud/contract/verifier/wiremock/DslToWireMockConverter.groovy

@@ -28,11 +28,6 @@ import org.springframework.cloud.contract.verifier.converter.StubGenerator
 @CompileStatic
 abstract class DslToWireMockConverter implements StubGenerator {
 
-	@Override
-	boolean canHandleFileName(String fileName) {
-		return fileName.endsWith('.groovy')
-	}
-
 	@Override
 	String generateOutputFileNameForInput(String inputFileName) {
 		return inputFileName.replaceAll(extension(inputFileName), 'json')