001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.component.http.helper;
018
019 import org.apache.camel.Exchange;
020 import org.apache.camel.component.http.HttpEndpoint;
021 import org.apache.camel.component.http.HttpMethods;
022
023 /**
024 * Helper methods for HTTP producers.
025 *
026 * @version $Revision: 833429 $
027 */
028 public final class HttpProducerHelper {
029
030 private HttpProducerHelper() {
031 }
032
033 /**
034 * Creates the URL to invoke.
035 *
036 * @param exchange the exchange
037 * @param endpoint the endpoint
038 * @return the URL to invoke
039 */
040 public static String createURL(Exchange exchange, HttpEndpoint endpoint) {
041 String uri = null;
042 if (!(endpoint.isBridgeEndpoint())) {
043 uri = exchange.getIn().getHeader(Exchange.HTTP_URI, String.class);
044 }
045 if (uri == null) {
046 uri = endpoint.getHttpUri().toString();
047 }
048
049 // append HTTP_PATH to HTTP_URI if it is provided in the header
050 // when the endpoint is not working as a bridge
051 String path = exchange.getIn().getHeader(Exchange.HTTP_PATH, String.class);
052 if (path != null) {
053 // make sure that there is exactly one "/" between HTTP_URI and
054 // HTTP_PATH
055 if (!uri.endsWith("/")) {
056 uri = uri + "/";
057 }
058 if (path.startsWith("/")) {
059 path = path.substring(1);
060 }
061 uri = uri.concat(path);
062 }
063
064 return uri;
065 }
066
067 /**
068 * Creates the HttpMethod to use to call the remote server, often either its GET or POST.
069 *
070 * @param exchange the exchange
071 * @return the created method
072 */
073 public static HttpMethods createMethod(Exchange exchange, HttpEndpoint endpoint, boolean hasPayload) {
074 // is a query string provided in the endpoint URI or in a header (header
075 // overrules endpoint)
076 String queryString = exchange.getIn().getHeader(Exchange.HTTP_QUERY, String.class);
077 if (queryString == null) {
078 queryString = endpoint.getHttpUri().getQuery();
079 }
080
081 // compute what method to use either GET or POST
082 HttpMethods answer;
083 HttpMethods m = exchange.getIn().getHeader(Exchange.HTTP_METHOD, HttpMethods.class);
084 if (m != null) {
085 // always use what end-user provides in a header
086 answer = m;
087 } else if (queryString != null) {
088 // if a query string is provided then use GET
089 answer = HttpMethods.GET;
090 } else {
091 // fallback to POST if we have payload, otherwise GET
092 answer = hasPayload ? HttpMethods.POST : HttpMethods.GET;
093 }
094
095 return answer;
096 }
097
098 }