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OpenApiRestProducerFactory.java
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OpenApiRestProducerFactory.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.camel.openapi;
import java.util.Map;
import java.util.StringJoiner;
import io.swagger.v3.oas.models.OpenAPI;
import io.swagger.v3.oas.models.Operation;
import io.swagger.v3.oas.models.PathItem;
import io.swagger.v3.oas.models.parameters.Parameter;
import io.swagger.v3.oas.models.responses.ApiResponse;
import io.swagger.v3.parser.OpenAPIV3Parser;
import io.swagger.v3.parser.core.models.SwaggerParseResult;
import org.apache.camel.CamelContext;
import org.apache.camel.CamelContextAware;
import org.apache.camel.Producer;
import org.apache.camel.spi.RestConfiguration;
import org.apache.camel.spi.RestProducerFactory;
import org.apache.camel.support.CamelContextHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class OpenApiRestProducerFactory implements RestProducerFactory {
private static final Logger LOG = LoggerFactory.getLogger(OpenApiRestProducerFactory.class);
@Override
public Producer createProducer(
CamelContext camelContext, String host,
String verb, String basePath, String uriTemplate, String queryParameters,
String consumes, String produces, RestConfiguration configuration, Map<String, Object> parameters)
throws Exception {
String apiDoc = (String) parameters.get("apiDoc");
// load json model
if (apiDoc == null) {
throw new IllegalArgumentException("OpenApi api-doc must be configured using the apiDoc option");
}
String path = uriTemplate != null ? uriTemplate : basePath;
// path must start with a leading slash
if (!path.startsWith("/")) {
path = "/" + path;
}
OpenAPI openApi = loadOpenApiModel(apiDoc);
Operation operation = getOpenApiOperation(openApi, verb, path);
if (operation == null) {
throw new IllegalArgumentException("OpenApi api-doc does not contain operation for " + verb + ":" + path);
}
// validate if we have the query parameters also
if (queryParameters != null) {
for (Parameter param : operation.getParameters()) {
if ("query".equals(param.getIn()) && Boolean.TRUE.equals(param.getRequired())) {
// check if we have the required query parameter defined
String key = param.getName();
String token = key + "=";
boolean hasQuery = queryParameters.contains(token);
if (!hasQuery) {
throw new IllegalArgumentException(
"OpenApi api-doc does not contain query parameter " + key + " for " + verb + ":" + path);
}
}
}
}
String componentName = (String) parameters.get("componentName");
return createHttpProducer(camelContext, openApi, operation, host, verb, path, queryParameters,
produces, consumes, componentName, parameters);
}
OpenAPI loadOpenApiModel(String apiDoc) throws Exception {
final OpenAPIV3Parser openApiParser = new OpenAPIV3Parser();
final SwaggerParseResult openApi = openApiParser.readLocation(apiDoc, null, null);
if (openApi != null && openApi.getOpenAPI() != null) {
return openApi.getOpenAPI();
}
// In theory there should be a message in the parse result but it has disappeared...
throw new IllegalArgumentException(
"The given OpenApi specification could not be loaded from `" + apiDoc + "`.");
}
private Operation getOpenApiOperation(OpenAPI openApi, String verb, String path) {
// path may include base path so skip that
String basePath = RestOpenApiSupport.getBasePathFromOasDocument(openApi);
if (basePath != null && path.startsWith(basePath)) {
path = path.substring(basePath.length());
}
PathItem modelPath = openApi.getPaths().get(path);
if (modelPath == null) {
return null;
}
// get,put,post,head,delete,patch,options
Operation op = null;
PathItem.HttpMethod method = PathItem.HttpMethod.valueOf(verb.toUpperCase());
if (method != null) {
return modelPath.readOperationsMap().get(method);
}
return op;
}
private Producer createHttpProducer(
CamelContext camelContext, OpenAPI openApi, Operation operation,
String host, String verb, String path, String queryParameters,
String consumes, String produces,
String componentName, Map<String, Object> parameters)
throws Exception {
LOG.debug("Using OpenApi operation: {} with {} {}", operation, verb, path);
RestProducerFactory factory = (RestProducerFactory) parameters.remove("restProducerFactory");
if (factory != null) {
LOG.debug("Using RestProducerFactory: {}", factory);
if (produces == null) {
StringJoiner producesBuilder = new StringJoiner(",");
if (operation.getResponses() != null) {
for (ApiResponse response : operation.getResponses().values()) {
if (response.getContent() != null) {
for (String mediaType : response.getContent().keySet()) {
producesBuilder.add(mediaType);
}
}
}
}
produces = producesBuilder.length() == 0 ? null : producesBuilder.toString();
}
if (consumes == null) {
StringJoiner consumesBuilder = new StringJoiner(",");
if (operation.getRequestBody() != null && operation.getRequestBody().getContent() != null) {
for (String mediaType : operation.getRequestBody().getContent().keySet()) {
consumesBuilder.add(mediaType);
}
}
consumes = consumesBuilder.length() == 0 ? null : consumesBuilder.toString();
}
String basePath;
String uriTemplate;
if (host == null) {
//if no explicit host has been configured then use host and base path from the openApi api-doc
host = RestOpenApiSupport.getHostFromOasDocument(openApi);
basePath = RestOpenApiSupport.getBasePathFromOasDocument(openApi);
uriTemplate = path;
} else {
// path includes also uri template
basePath = path;
uriTemplate = null;
}
RestConfiguration config = CamelContextHelper.getRestConfiguration(camelContext, null, componentName);
Producer answer = factory.createProducer(camelContext, host, verb, basePath, uriTemplate, queryParameters, consumes,
produces,
config, parameters);
CamelContextAware.trySetCamelContext(answer, camelContext);
return answer;
} else {
throw new IllegalStateException("Cannot find RestProducerFactory in Registry or as a Component to use");
}
}
}