diff options
Diffstat (limited to 'wso2/wso2bpel-ext/wso2bpel-core/BPEL4RESTLight/src/main/java/org/opentosca/bpel4restlight/rest/LowLevelRestApi.java')
| -rw-r--r-- | wso2/wso2bpel-ext/wso2bpel-core/BPEL4RESTLight/src/main/java/org/opentosca/bpel4restlight/rest/LowLevelRestApi.java | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/wso2/wso2bpel-ext/wso2bpel-core/BPEL4RESTLight/src/main/java/org/opentosca/bpel4restlight/rest/LowLevelRestApi.java b/wso2/wso2bpel-ext/wso2bpel-core/BPEL4RESTLight/src/main/java/org/opentosca/bpel4restlight/rest/LowLevelRestApi.java new file mode 100644 index 0000000..c522ca9 --- /dev/null +++ b/wso2/wso2bpel-ext/wso2bpel-core/BPEL4RESTLight/src/main/java/org/opentosca/bpel4restlight/rest/LowLevelRestApi.java @@ -0,0 +1,182 @@ +/******************************************************************************* + * Copyright (c) 2012-2013 University of Stuttgart. + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Eclipse Public License v1.0 + * and the Apache License 2.0 which both accompany this distribution, + * and are available at http://www.eclipse.org/legal/epl-v10.html + * and http://www.apache.org/licenses/LICENSE-2.0 + *******************************************************************************/ +/* + * Modifications Copyright 2016-2017 ZTE Corporation. + */ + /** + * This static-class eases HTTP-method execution by self-managed fault-handling + * and automated Response-information processing + */ +package org.opentosca.bpel4restlight.rest; + +import java.io.IOException; +import java.util.Map; +import java.util.Set; + +import org.apache.commons.httpclient.Header; +import org.apache.commons.httpclient.HttpClient; +import org.apache.commons.httpclient.HttpMethod; +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; +import org.json.simple.JSONArray; +import org.json.simple.JSONObject; +import org.json.simple.parser.JSONParser; +import org.json.simple.parser.ParseException; + + +public class LowLevelRestApi { + + protected static final Log log = LogFactory.getLog(LowLevelRestApi.class); + // Local HttpClient used for every communication (Singleton implementation) +// private static HttpClient httpClient = new HttpClient(); + + /** + * Executes a passed HttpMethod (Method type is either PUT, POST, GET or + * DELETE) and returns a HttpResponseMessage + * + * @param method Method to execute + * @return HttpResponseMessage which contains all information about the + * execution + */ + public static HttpResponseMessage executeHttpMethod(HttpMethod method) { + + HttpResponseMessage responseMessage = null; + + try { + log.debug("Method invocation on URI: \n"); + log.debug(method.getURI().toString()); + + // Execute Request + HttpClient httpClient = new HttpClient(); + httpClient.executeMethod(method); + responseMessage = LowLevelRestApi.extractResponseInformation(method); + + } catch (Exception e) { + log.error("call rest error:", e); + } finally { + // Release Connection anyway + method.releaseConnection(); + } + + // Extract response information and return + return responseMessage; + } + + /** + * Extracts the response information from an executed HttpMethod + * + * @param method Executed Method + * @return Packaged response information + */ + private static HttpResponseMessage extractResponseInformation(HttpMethod method) { + // Create and return HttpResponseMethod + HttpResponseMessage responseMessage = new HttpResponseMessage(); + responseMessage.setStatusCode(method.getStatusCode()); + try { + responseMessage.setResponseBody(getResponseBody(method)); + } catch (Exception e) { + log.error(e); + } + return responseMessage; + + } + + /** + * getResponseBody + * + * get response body info, if response body is a json object, then translate json object to xml + * if the rest request failed, i.e. the response body is a 404 error page, then response the body with header <root> + * @param method + * @return + * @throws ParseException + */ + private static String getResponseBody(HttpMethod method) throws ParseException + { + String result = null; + try { + result = method.getResponseBodyAsString(); + log.debug("result:"); + log.debug(result); + } catch (IOException e) { + log.error(e); + } + + Header header = method.getRequestHeader("Accept"); + if ("application/json".equals(header.getValue())) { + StringBuilder sb = new StringBuilder(); + sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>"); + sb.append("<root>"); + if(result != null && !"".equals(result)) { + /** + if(result.startsWith("<html>")) { + sb.append("<![CDATA["); + sb.append(result); + sb.append("]]>"); + } else { + Object json = new JSONParser().parse(result); + json2Xml(sb, "obj", json); + } + */ + + try { + Object json = new JSONParser().parse(result); + json2Xml(sb, "obj", json); + } catch (Exception e) { + log.error(e); + sb.append("<![CDATA["); + sb.append(result); + sb.append("]]>"); + } + } + sb.append("</root>"); + + log.debug("responseBody:"); + log.debug(sb.toString()); + return sb.toString(); + } + return result; + } + + + @SuppressWarnings("unchecked") + public static void json2Xml(StringBuilder sb, String key, Object jsonObject) { + if(jsonObject == null) { + sb.append("<error>empty</error>"); + return; + } + + if(jsonObject instanceof JSONArray) { + JSONArray array = (JSONArray) jsonObject; + sb.append("<").append(key).append("s").append(">"); + for(int i=0, len=array.size(); i<len; i++) { + json2Xml(sb, key, array.get(i)); + } + sb.append("</").append(key).append("s").append(">"); + + return; + } else if(jsonObject instanceof JSONObject) { + sb.append("<").append(key).append(">"); + JSONObject json = (JSONObject) jsonObject; + for(Map.Entry<String, Object> entry : (Set<Map.Entry<String, Object>>)json.entrySet()) { + json2Xml(sb, entry.getKey(), entry.getValue()); + } + sb.append("</").append(key).append(">"); + return; + } else { + sb.append("<").append(key).append(">"); + sb.append("<![CDATA["); + sb.append(jsonObject.toString()); + sb.append("]]>"); + sb.append("</").append(key).append(">"); + + return; + } + } + +} |