From 4b3149233be777a531417eb0ca6bafff0483fa1c Mon Sep 17 00:00:00 2001 From: kelvingoodson Date: Thu, 27 May 2010 12:19:53 +0000 Subject: Branch for 2.0 Milestone M5 git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@948800 13f79535-47bb-0310-9956-ffa450edef68 --- .../jsonrpc/provider/JSONRPCServiceServlet.java | 381 +++++++++++++++++++++ 1 file changed, 381 insertions(+) create mode 100644 sca-java-2.x/branches/sca-java-2.0-M5/modules/binding-jsonrpc-runtime/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/provider/JSONRPCServiceServlet.java (limited to 'sca-java-2.x/branches/sca-java-2.0-M5/modules/binding-jsonrpc-runtime/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/provider/JSONRPCServiceServlet.java') diff --git a/sca-java-2.x/branches/sca-java-2.0-M5/modules/binding-jsonrpc-runtime/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/provider/JSONRPCServiceServlet.java b/sca-java-2.x/branches/sca-java-2.0-M5/modules/binding-jsonrpc-runtime/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/provider/JSONRPCServiceServlet.java new file mode 100644 index 0000000000..1177940891 --- /dev/null +++ b/sca-java-2.x/branches/sca-java-2.0-M5/modules/binding-jsonrpc-runtime/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/provider/JSONRPCServiceServlet.java @@ -0,0 +1,381 @@ +/* + * 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.tuscany.sca.binding.jsonrpc.provider; + +import java.io.BufferedReader; +import java.io.CharArrayWriter; +import java.io.IOException; +import java.io.InputStreamReader; +import java.io.OutputStream; +import java.io.UnsupportedEncodingException; +import java.math.BigInteger; +import java.net.URLDecoder; +import java.security.MessageDigest; +import java.util.Date; +import java.util.List; + +import javax.servlet.ServletConfig; +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; +import javax.servlet.http.HttpSession; + +import org.apache.commons.codec.binary.Base64; +import org.apache.tuscany.sca.assembly.Binding; +import org.apache.tuscany.sca.interfacedef.Operation; +import org.apache.tuscany.sca.invocation.Message; +import org.apache.tuscany.sca.invocation.MessageFactory; +import org.apache.tuscany.sca.runtime.RuntimeEndpoint; +import org.jabsorb.JSONRPCBridge; +import org.jabsorb.JSONRPCResult; +import org.jabsorb.JSONRPCServlet; +import org.json.JSONArray; +import org.json.JSONException; +import org.json.JSONObject; +import org.oasisopen.sca.ServiceRuntimeException; + +/** + * Servlet that handles JSON-RPC requests invoking SCA services. + * + * There is an instance of this Servlet for each + * + * @version $Rev$ $Date$ + */ +public class JSONRPCServiceServlet extends JSONRPCServlet { + private static final long serialVersionUID = 1L; + + transient MessageFactory messageFactory; + + transient Binding binding; + transient String serviceName; + transient Object serviceInstance; + transient RuntimeEndpoint endpoint; + transient Class serviceInterface; + + public JSONRPCServiceServlet(MessageFactory messageFactory, + RuntimeEndpoint endpoint, + Class serviceInterface, + Object serviceInstance) { + this.endpoint = endpoint; + this.messageFactory = messageFactory; + this.binding = endpoint.getBinding(); + this.serviceName = binding.getName(); + this.serviceInterface = serviceInterface; + this.serviceInstance = serviceInstance; + } + + /** + * Override to do nothing as the JSONRPCServlet is setup by the + * service method in this class. + */ + @Override + public void init(ServletConfig config) { + } + + @Override + public void service(HttpServletRequest request, HttpServletResponse response) throws IOException { + if ("smd".equals(request.getQueryString())) { + handleSMDRequest(request, response); + } else { + try { + handleServiceRequest(request, response); + + } catch(RuntimeException re) { + if (re.getCause() instanceof javax.security.auth.login.LoginException) { + response.setHeader("WWW-Authenticate", "BASIC realm=\"" + "ldap-realm" + "\""); + response.sendError(HttpServletResponse.SC_UNAUTHORIZED); + } + } finally { + HttpSession session = request.getSession(false); + if (session != null) { + session.removeAttribute("JSONRPCBridge"); + } + } + } + } + + private void handleServiceRequest(HttpServletRequest request, HttpServletResponse response) throws IOException { + // Decode using the charset in the request if it exists otherwise + // use UTF-8 as this is what all browser implementations use. + // The JSON-RPC-Java JavaScript client is ASCII clean so it + // although here we can correctly handle data from other clients + // that do not escape non ASCII data + String charset = request.getCharacterEncoding(); + if (charset == null) { + charset = "UTF-8"; + } + + CharArrayWriter data = new CharArrayWriter(); + if (request.getMethod().equals("GET")) { + // if using GET Support (see http://groups.google.com/group/json-rpc/web/json-rpc-over-http) + + //parse the GET QueryString + try { + String params = new String(Base64.decodeBase64(URLDecoder.decode(request.getParameter("params"),charset).getBytes())); + StringBuffer sb = new StringBuffer(); + sb.append("{"); + sb.append("\"method\": \"" + request.getParameter("method") + "\","); + sb.append("\"params\": " + params + ","); + sb.append("\"id\":" + request.getParameter("id")); + sb.append("}"); + + data.write(sb.toString().toCharArray(), 0, sb.length()); + } catch (Exception e) { + //FIXME Exceptions are not handled correctly here + // They should be reported to the client JavaScript as proper + // JavaScript exceptions. + throw new RuntimeException("Unable to parse request", e); + } + + } else { + // default POST style + BufferedReader in = new BufferedReader(new InputStreamReader(request.getInputStream(), charset)); + + // Read the request into charArray + char[] buf = new char[4096]; + int ret; + while ((ret = in.read(buf, 0, 4096)) != -1) { + data.write(buf, 0, ret); + } + } + + JSONObject jsonReq = null; + String method = null; + //parse the JSON payload + try { + jsonReq = new JSONObject(data.toString()); + method = jsonReq.getString("method"); + } catch (Exception e) { + //FIXME Exceptions are not handled correctly here + // They should be reported to the client JavaScript as proper + // JavaScript exceptions. + throw new RuntimeException("Unable to parse request", e); + } + + // check if it's a system request + // or a method invocation + byte[] bout; + try { + if (method.startsWith("system.")) { + bout = handleJSONRPCSystemInvocation(request, response, data.toString()); + } else { + bout = handleJSONRPCMethodInvocation(request, response, jsonReq); + } + } catch (JSONException e) { + throw new RuntimeException(e); + } + + // Send response to client + // Encode using UTF-8, although We are actually ASCII clean as + // all unicode data is JSON escaped using backslash u. This is + // less data efficient for foreign character sets but it is + // needed to support naughty browsers such as Konqueror and Safari + // which do not honour the charset set in the response + response.setContentType("text/plain;charset=utf-8"); + + //set Cache-Control to no-cache to avoid intermediary + //proxy/reverse-proxy caches and always hit the server + //that would identify if the value was current or not + response.setHeader("Cache-Control", "no-cache"); + response.setHeader("Expires", new Date(0).toGMTString()); + + //handle etag if using GET + if( request.getMethod().equals("GET")) { + String eTag = calculateETag(bout); + + // Test request for predicates. + String predicate = request.getHeader( "If-Match" ); + if (( predicate != null ) && ( !predicate.equals(eTag) )) { + // No match, should short circuit + response.sendError(HttpServletResponse.SC_PRECONDITION_FAILED); + return; + } + predicate = request.getHeader( "If-None-Match" ); + if (( predicate != null ) && ( predicate.equals(eTag) )) { + // Match, should short circuit + response.sendError(HttpServletResponse.SC_NOT_MODIFIED); + return; + } + + response.addHeader("ETag", eTag); + } + + OutputStream out = response.getOutputStream(); + out.write(bout); + out.flush(); + out.close(); + } + + /** + * handles requests for the SMD descriptor for a service + */ + protected void handleSMDRequest(HttpServletRequest request, HttpServletResponse response) throws IOException, UnsupportedEncodingException { + String serviceUrl = request.getRequestURL().toString(); + String smd = JavaToSmd.interfaceToSmd(serviceInterface, serviceUrl); + + response.setContentType("text/plain;charset=utf-8"); + OutputStream out = response.getOutputStream(); + byte[] bout = smd.getBytes("UTF-8"); + out.write(bout); + out.flush(); + out.close(); + } + + protected byte[] handleJSONRPCSystemInvocation(HttpServletRequest request, HttpServletResponse response, String requestData) throws IOException, + UnsupportedEncodingException, JSONException { + /* + * Create a new bridge for every request to avoid all the problems with + * JSON-RPC-Java storing the bridge in the session + */ + HttpSession session = request.getSession(); + + JSONRPCBridge jsonrpcBridge = new JSONRPCBridge(); + jsonrpcBridge.registerObject("Service", serviceInstance, serviceInterface); + session.setAttribute("JSONRPCBridge", jsonrpcBridge); + + org.json.JSONObject jsonReq = null; + JSONRPCResult jsonResp = null; + jsonReq = new org.json.JSONObject(requestData); + + String method = jsonReq.getString("method"); + if ((method != null) && (method.indexOf('.') < 0)) { + jsonReq.putOpt("method", "Service" + "." + method); + } + + // invoke the request + jsonResp = jsonrpcBridge.call(new Object[] {request}, jsonReq); + + return jsonResp.toString().getBytes("UTF-8"); + } + + protected byte[] handleJSONRPCMethodInvocation(HttpServletRequest request, HttpServletResponse response, JSONObject jsonReq) throws IOException, + UnsupportedEncodingException { + + String method = null; + Object[] args = null; + Object id = null; + try { + // Extract the method + method = jsonReq.getString("method"); + if ((method != null) && (method.indexOf('.') < 0)) { + jsonReq.putOpt("method", "Service" + "." + method); + } + + // Extract the arguments + JSONArray array = jsonReq.getJSONArray("params"); + args = new Object[array.length()]; + for (int i = 0; i < args.length; i++) { + args[i] = array.get(i); + } + id = jsonReq.get("id"); + + } catch (Exception e) { + throw new RuntimeException("Unable to find json method name", e); + } + + // invoke the request + Operation jsonOperation = findOperation(method); + Object result = null; + + + // Invoke the get operation on the service implementation + Message requestMessage = messageFactory.createMessage(); + requestMessage.setOperation(jsonOperation); + + requestMessage.getHeaders().add(request); + + requestMessage.setBody(args); + + //result = wire.invoke(jsonOperation, args); + Message responseMessage = null; + try { + responseMessage = endpoint.getInvocationChain(jsonOperation).getHeadInvoker().invoke(requestMessage); + } catch (RuntimeException re) { + if (re.getCause() instanceof javax.security.auth.login.LoginException) { + throw re; + } else { + //some other exception + JSONRPCResult errorResult = new JSONRPCResult(JSONRPCResult.CODE_REMOTE_EXCEPTION, id, re); + return errorResult.toString().getBytes("UTF-8"); + } + } + + if (!responseMessage.isFault()) { + //successful execution of the invocation + try { + result = responseMessage.getBody(); + JSONObject jsonResponse = new JSONObject(); + jsonResponse.put("result", result); + jsonResponse.putOpt("id", id); + //get response to send to client + return jsonResponse.toString().getBytes("UTF-8"); + } catch (Exception e) { + throw new ServiceRuntimeException("Unable to create JSON response", e); + } + } else { + //exception thrown while executing the invocation + Throwable exception = (Throwable)responseMessage.getBody(); + JSONRPCResult errorResult = new JSONRPCResult(JSONRPCResult.CODE_REMOTE_EXCEPTION, id, exception ); + return errorResult.toString().getBytes("UTF-8"); + } + + } + + /** + * Find the operation from the component service contract + * @param componentService + * @param method + * @return + */ + private Operation findOperation(String method) { + if (method.contains(".")) { + method = method.substring(method.lastIndexOf(".") + 1); + } + + List operations = endpoint.getComponentServiceInterfaceContract().getInterface().getOperations(); + //endpoint.getComponentTypeServiceInterfaceContract().getInterface().getOperations(); + //componentService.getBindingProvider(binding).getBindingInterfaceContract().getInterface().getOperations(); + + + Operation result = null; + for (Operation o : operations) { + if (o.getName().equalsIgnoreCase(method)) { + result = o; + break; + } + } + + return result; + } + + private String calculateETag(byte[] content) { + String eTag = "invalid"; + try { + MessageDigest messageDigest = MessageDigest.getInstance("MD5"); + byte[] digest = messageDigest.digest(content); + BigInteger number = new BigInteger(1, digest); + StringBuffer sb = new StringBuffer('0'); + sb.append(number.toString(16)); + eTag = sb.toString(); + } catch(Exception e) { + //ignore, we will return random etag + eTag = Integer.toString((new java.util.Random()).nextInt(Integer.MAX_VALUE)); + } + return eTag; + } +} -- cgit v1.2.3