diff options
Diffstat (limited to 'sca-java-2.x/tags/2.0.1-RC1/modules/binding-http-runtime/src/main/java/org/apache/tuscany/sca/binding/http/wireformat/provider/HTTPJSONWireFormatServiceInterceptor.java')
| -rw-r--r-- | sca-java-2.x/tags/2.0.1-RC1/modules/binding-http-runtime/src/main/java/org/apache/tuscany/sca/binding/http/wireformat/provider/HTTPJSONWireFormatServiceInterceptor.java | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/binding-http-runtime/src/main/java/org/apache/tuscany/sca/binding/http/wireformat/provider/HTTPJSONWireFormatServiceInterceptor.java b/sca-java-2.x/tags/2.0.1-RC1/modules/binding-http-runtime/src/main/java/org/apache/tuscany/sca/binding/http/wireformat/provider/HTTPJSONWireFormatServiceInterceptor.java new file mode 100644 index 0000000000..3323fd34fe --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/binding-http-runtime/src/main/java/org/apache/tuscany/sca/binding/http/wireformat/provider/HTTPJSONWireFormatServiceInterceptor.java @@ -0,0 +1,252 @@ +/*
+ * 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.http.wireformat.provider;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Set;
+import java.util.SortedSet;
+import java.util.StringTokenizer;
+import java.util.TreeSet;
+
+import javax.servlet.ServletRequest;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.tuscany.sca.common.http.HTTPContext;
+import org.apache.tuscany.sca.interfacedef.DataType;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Interceptor;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
+import org.oasisopen.sca.ServiceRuntimeException;
+
+/**
+ * Handles the default wire format for the http binding
+ *
+ * 1- determine the request and response format (xml, json, etc) from the
+ * binding config or content type header and accept headers
+ * - TODO: need a way to configure the databinding framework based on that format
+ * 2- get the request contents from the HttpServletRequest
+ * - for a post its just the request body
+ * - for a get need to convert the query string into a body based on the format (xml, json, etc)
+ * 3- send the request on down the wire
+ * 4- set the response contents in the HttpServletResponse
+ * (the databinding should already have put it in the correct format)
+ *
+ */
+public class HTTPJSONWireFormatServiceInterceptor implements Interceptor {
+
+ private Invoker next;
+ private String jsonpCallbackName = "callback";
+
+ public HTTPJSONWireFormatServiceInterceptor(RuntimeEndpoint endpoint) {
+ }
+
+ @Override
+ public void setNext(Invoker next) {
+ this.next = next;
+ }
+
+ @Override
+ public Invoker getNext() {
+ return next;
+ }
+
+ @Override
+ public Message invoke(Message msg) {
+ try {
+ return invokeResponse(getNext().invoke(invokeRequest(msg)));
+ } catch (IOException e) {
+ throw new ServiceRuntimeException(e);
+ }
+ }
+
+ private Message invokeRequest(Message msg) throws IOException {
+ HTTPContext context = msg.getBindingContext();
+ HttpServletRequest servletRequest = context.getHttpRequest();
+ if ("GET".equals(servletRequest.getMethod())) {
+ msg.setBody(getRequestFromQueryString(msg.getOperation(), servletRequest));
+ } else {
+ msg.setBody(getRequestFromPost(msg.getOperation(), servletRequest));
+ }
+ return msg;
+ }
+
+ /**
+ * The data binding seems to be expecting an Object array of json strings so if the
+ * post data is a json array convert that to an array of strings
+ * TODO: should this be being done by the data binding framework?
+ */
+ private Object[] getRequestFromPost(Operation operation, HttpServletRequest servletRequest) throws IOException {
+ List<Object> os = new ArrayList<Object>();
+ String data = read(servletRequest);
+ if (data.length() > 0) {
+ if (data.startsWith("[") && data.endsWith("]")) {
+ data = data.substring(1, data.length()-1);
+ StringTokenizer st = new StringTokenizer(data, ",");
+ while (st.hasMoreElements()) {
+ os.add(st.nextElement());
+ }
+ } else {
+ os.add(data);
+ }
+ }
+ return os.toArray();
+ }
+
+ private Message invokeResponse(Message msg) throws IOException {
+ HTTPContext context = msg.getBindingContext();
+ HttpServletRequest servletRequest = context.getHttpRequest();
+ HttpServletResponse servletResponse = context.getHttpResponse();
+
+ if (msg.isFault()) {
+ servletResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, String.valueOf(msg.getBody()));
+ } else {
+ String response = getResponseAsString(servletRequest, servletResponse, msg.getBody());
+ servletResponse.getOutputStream().println(response);
+ }
+
+ return msg;
+ }
+
+ /**
+ * Turn the request into a string array of JSON structures. The data binding
+ * layer will then convert each of the individual parameters into the appropriate
+ * types for the implementation interface
+ *
+ * From ML thread: http://apache.markmail.org/message/ix3vvyomronellmi
+ * 1- if the binding configuration contains a mapping from query parameter name to operation parameter then use that.
+ * 2- if the service interface or impl uses jaxrs annotations to name the parameters then use that mapping
+ * 3- if the query parameters are name arg0, arg1 etc than use those names for the mapping,
+ * 4- otherwise use the order in the query string.
+ */
+ protected Object[] getRequestFromQueryString(Operation operation, ServletRequest servletRequest) {
+
+ List<DataType> types = operation.getInputType().getLogical();
+ int typesIndex = 0;
+
+ List<String> jsonRequestArray = new ArrayList<String>();
+
+ for (String name : getOrderedParameterNames(servletRequest)) {
+ String jsonRequest = "";
+ // quote string parameters so clients work in the usual javascript way
+ if (typesIndex < types.size() && String.class.equals(types.get(typesIndex++).getGenericType())) {
+ String x = servletRequest.getParameter(name);
+ if (x.startsWith("\"") || x.startsWith("'")) {
+ jsonRequest += x;
+ } else {
+ if (x.contains("\"")) {
+ jsonRequest += "'" + x + "'";
+ } else {
+ jsonRequest += "\"" + x + "\"";
+ }
+ }
+ } else {
+ jsonRequest += servletRequest.getParameter(name);
+ }
+ jsonRequestArray.add(jsonRequest);
+ }
+
+ return jsonRequestArray.toArray();
+ }
+
+ /**
+ * Get the request parameter names in the correct order.
+ * Either the query parameters are named arg0, arg1, arg2 etc or else use the order
+ * from the order in the query string. Eg, the url:
+ * http://localhost:8085/HelloWorldService/sayHello2?first=petra&last=arnold&callback=foo"
+ * should invoke:
+ * sayHello2("petra", "arnold")
+ * so the parameter names should be ordered: "first", "last"
+ */
+ protected List<String> getOrderedParameterNames(ServletRequest servletRequest) {
+ List<String> orderedNames = new ArrayList<String>();
+ Set<String> parameterNames = servletRequest.getParameterMap().keySet();
+ if (parameterNames.contains("arg0")) {
+ for (int i=0; i<parameterNames.size(); i++) {
+ String name = "arg" + i;
+ if (parameterNames.contains(name)) {
+ orderedNames.add(name);
+ } else {
+ break;
+ }
+ }
+ } else {
+ final String queryString = ((HttpServletRequest)servletRequest).getQueryString();
+ SortedSet<String> sortedNames = new TreeSet<String>(new Comparator<String>(){
+ public int compare(String o1, String o2) {
+ int i = queryString.indexOf(o1);
+ int j = queryString.indexOf(o2);
+ return i - j;
+ }});
+ for (String name : parameterNames) {
+ // ignore system and jsonpCallbackName parameters
+ if (!name.startsWith("_") && !name.equals(jsonpCallbackName)) {
+ sortedNames.add(name);
+ }
+ }
+ orderedNames.addAll(sortedNames);
+ }
+ return orderedNames;
+ }
+
+ /**
+ * The databinding layer will have converted the return type into a JSON string so simply
+ * add wrap it for return.
+ */
+ protected String getResponseAsString(HttpServletRequest servletRequest, HttpServletResponse servletResponse, Object response) {
+ String jsonResponse = response == null ? "" : response.toString();
+
+ if ("GET".equals(servletRequest.getMethod())) {
+ // handle JSONP callback name padding
+ String callback = servletRequest.getParameter(jsonpCallbackName);
+ if (callback != null && callback.length() > 1) {
+ jsonResponse = callback + "(" + jsonResponse + ");";
+ }
+ }
+
+ return jsonResponse;
+ }
+
+ protected static String read(HttpServletRequest servletRequest) throws IOException {
+ InputStream is = servletRequest.getInputStream();
+ BufferedReader reader = null;
+ try {
+ reader = new BufferedReader(new InputStreamReader(is));
+ StringBuffer sb = new StringBuffer();
+ String str;
+ while ((str = reader.readLine()) != null) {
+ sb.append(str);
+ }
+ return sb.toString().trim();
+ } finally {
+ if (reader != null) {
+ reader.close();
+ }
+ }
+ }
+}
|