Source Code Cross Referenced for XHttpRequestProxy.java in  » XML-UI » xui32 » com » xoetrope » service » http » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML UI » xui32 » com.xoetrope.service.http 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.xoetrope.service.http;
002:
003:        import java.io.InputStream;
004:        import java.io.InputStreamReader;
005:        import java.io.OutputStream;
006:        import java.net.HttpURLConnection;
007:        import java.net.URL;
008:        import java.net.URLConnection;
009:        import java.util.Hashtable;
010:
011:        import net.xoetrope.optional.service.ServiceProxy;
012:        import net.xoetrope.optional.service.ServiceProxyArgs;
013:        import net.xoetrope.optional.service.ServiceProxyException;
014:        import java.net.URLEncoder;
015:        import java.util.Enumeration;
016:        import net.xoetrope.optional.service.ServiceContext;
017:
018:        /**
019:         * Makes a service call via the HTTP protocol. By default the arguments are
020:         * URLEncoded and the response unencoded. Unlike the XHttpClientServiceProxy, 
021:         * this class is intended for use with standard http requests.
022:         *
023:         * <p> Copyright (c) Xoetrope Ltd., 2001-2006, This software is licensed under
024:         * the GNU Public License (GPL), please see license.txt for more details. If
025:         * you make commercial use of this software you must purchase a commercial
026:         * license from Xoetrope.</p>
027:         * <p> $Revision: 1.2 $</p>
028:         */
029:        public class XHttpRequestProxy extends ServiceProxy {
030:            private String sessionID;
031:            private int responseCode;
032:
033:            /**
034:             * Error sent back in the case that a connection cannot be established.
035:             */
036:            public static final String ERR_CANNOT_CONNECT = "httprequestproxy:cannotconnect";
037:            public static final String PARAM_AUTHORIZATION = "httprequestproxy:auth";
038:            public static final String PARAM_BODY = "httprequestproxy:body";
039:            public static final String REQUEST_METHOD = "httprequestproxy:request_method";
040:
041:            protected String sessionKey = "jsessionid";
042:            protected boolean useCookies = true;
043:
044:            /*
045:             * The original string from which the url is constructed.
046:             */
047:            protected String urlOrig;
048:
049:            /*
050:             * The url to be called.
051:             */
052:            protected URL url;
053:
054:            /*
055:             * Flag to indicate whether or not the url should be encoded.
056:             */
057:            protected boolean urlEncode = true;
058:
059:            private String userName;
060:            private String password;
061:
062:            public XHttpRequestProxy() {
063:                status = OK;
064:            }
065:
066:            public void setUrlEncoding(String encode) {
067:                if (encode.compareTo("false") == 0)
068:                    urlEncode = false;
069:                else
070:                    urlEncode = true;
071:            }
072:
073:            public void setUrl(String urlStr) {
074:                urlOrig = urlStr;
075:            }
076:
077:            /**
078:             * Makes a call to a server using the http protocol. The arguments are by
079:             * default URLEncoded.
080:             * @param method the method name to be invoked
081:             * @param context the ServiceContext for this ServiceProxy call
082:             * @return the response or result of the call
083:             * @throws ServiceProxyException
084:             */
085:            public Object call(String method, ServiceContext context)
086:                    throws ServiceProxyException {
087:                URLConnection conn = null;
088:                HttpURLConnection httpConn = null;
089:                responseCode = 0;
090:
091:                try {
092:                    status = STARTED;
093:                    StringBuffer arguments = new StringBuffer();
094:                    ServiceProxyArgs args = context.getArgs();
095:                    Hashtable passArgs = context.getPassArgs();
096:                    Enumeration keys = passArgs.keys();
097:                    while (keys.hasMoreElements()) {
098:                        String name = (String) keys.nextElement();
099:                        if (name.equals(PARAM_AUTHORIZATION)
100:                                || name.equals(PARAM_BODY))
101:                            continue;
102:                        Object argObj = passArgs.get(name);
103:                        String argValue = (argObj == null) ? "" : argObj
104:                                .toString();
105:                        if (arguments.length() > 0)
106:                            arguments.append("&");
107:                        arguments.append(URLEncoder.encode(name, "UTF-8"));
108:                        argValue = (argValue == null ? "" : argValue);
109:                        arguments.append("="
110:                                + URLEncoder.encode(argValue, "UTF-8"));
111:                    }
112:
113:                    Object argUrl = args.getConfigParam("url");
114:                    String urlStr;
115:                    if (argUrl != null)
116:                        urlStr = argUrl.toString();
117:                    else
118:                        urlStr = urlOrig;
119:
120:                    //      if ( arguments.length() > 0 )
121:                    //        urlStr += "?" + arguments.toString();
122:                    url = new URL(urlStr);
123:                    conn = url.openConnection();
124:                    if (conn instanceof  HttpURLConnection)
125:                        httpConn = (HttpURLConnection) conn;
126:
127:                    // Append the session id
128:                    setSessionID(conn, arguments);
129:
130:                    String authorization = (String) args
131:                            .getConfigParam(PARAM_AUTHORIZATION);
132:                    if (authorization != null)
133:                        conn.setRequestProperty("Authorization", "Basic "
134:                                + authorization);
135:
136:                    boolean doOutput = false;
137:                    if (httpConn != null) {
138:                        String requestMethod = (String) args
139:                                .getConfigParam(REQUEST_METHOD);
140:                        if (requestMethod != null) {
141:                            httpConn.setRequestMethod(requestMethod);
142:                            if (requestMethod.equals("PUT")
143:                                    || requestMethod.equals("POST"))
144:                                doOutput = true;
145:                        }
146:                    }
147:
148:                    conn.setDefaultUseCaches(false);
149:                    conn.setDoOutput(doOutput);
150:                    conn.setIfModifiedSince(0);
151:
152:                    if (doOutput) {
153:                        OutputStream o = conn.getOutputStream();
154:                        if (arguments.length() > 0)
155:                            o.write(arguments.toString().getBytes());
156:                        byte[] bodyBytes = (byte[]) passArgs.get(PARAM_BODY);
157:                        if (bodyBytes != null) {
158:                            if (arguments.length() > 0)
159:                                o.write("\n".getBytes());
160:                            o.write(bodyBytes);
161:                            o.flush();
162:                        }
163:                    }
164:
165:                    status = PENDING;
166:                    conn.connect();
167:                    if (httpConn != null)
168:                        responseCode = httpConn.getResponseCode();
169:
170:                    if (responseCode >= 400)
171:                        return null;
172:
173:                    InputStream is = conn.getInputStream();
174:
175:                    InputStreamReader isr = new InputStreamReader(is);
176:                    char[] c = new char[4096];
177:
178:                    int i = 1;
179:                    String result = new String("");
180:                    while (i != -1) {
181:                        i = isr.read(c);
182:                        if (i > 0)
183:                            result += new String(c, 0, i);
184:                    }
185:
186:                    // Get the session ID
187:                    retrieveSessionID(conn);
188:
189:                    isr.close();
190:                    is.close();
191:
192:                    status = COMPLETE;
193:                    return result;
194:                } catch (Exception e) {
195:                    status = FAILED;
196:                    context.addError(ERR_CANNOT_CONNECT);
197:                    throw (new ServiceProxyException("'" + method
198:                            + "' generated an exception : " + e.getMessage()));
199:                }
200:
201:            }
202:
203:            /**
204:             * Set the attributes for this service proxy. This class can set attributes 
205:             * for 'url' and 'urlEncode'.
206:             * @param attribs The Hashtable of attributes as found in the XML declaration
207:             */
208:            public void setAttributes(Hashtable attribs) {
209:                setUrl((String) attribs.get("url"));
210:                String encode = (String) attribs.get("urlEncode");
211:                setUrlEncoding((encode == null) ? "false" : encode);
212:            }
213:
214:            /**
215:             * Set the session id header key. By default this is setup to deal with 
216:             * servlets and has a value of 'jsessionid'
217:             * @param key the new key value
218:             */
219:            public void setSessionKey(String key) {
220:                sessionKey = key;
221:            }
222:
223:            /**
224:             * Setup the session id information.
225:             * @param key the new key value
226:             * @param id the new session id value
227:             * @param state true to use cookies, otherwise URL rewriting is used
228:             */
229:            public void setupSession(boolean state, String key, String id) {
230:                useCookies = state;
231:                sessionKey = key;
232:                sessionID = id;
233:            }
234:
235:            /**
236:             * Get the response code for this request
237:             */
238:            public Integer getStatus() {
239:                return new Integer(responseCode);
240:            }
241:
242:            /**
243:             * Attempt to get the session ID
244:             * @param conn the connection
245:             */
246:            protected void retrieveSessionID(URLConnection conn) {
247:                if (sessionID == null)
248:                    useCookies = false;
249:
250:                String key = "";
251:                String id = "";
252:                if (conn != null) {
253:                    for (int i = 1; (key = conn.getHeaderFieldKey(i)) != null; i++) {
254:                        if (key.equalsIgnoreCase("set-cookie")) {
255:                            id = conn.getHeaderField(key);
256:                            id = id.substring(0, id.indexOf(";"));
257:                            useCookies = true;
258:                        }
259:                    }
260:                }
261:
262:                sessionID = id;
263:                if (!useCookies) {
264:                    // Retrieve the session ID.
265:                    sessionID = conn.getHeaderField(sessionKey);
266:                    useCookies = false;
267:                }
268:            }
269:
270:            /**
271:             * Attempt to get the session ID
272:             * @param conn the connection
273:             */
274:            protected void setSessionID(URLConnection conn,
275:                    StringBuffer arguments) {
276:                if (sessionID == null)
277:                    return;
278:
279:                if (useCookies)
280:                    conn.setRequestProperty("Cookie", sessionID);
281:                else {
282:                    if (sessionID != null) {
283:                        if (arguments.length() > 0)
284:                            arguments.append("&");
285:                        arguments.append(sessionKey + "=" + sessionID);
286:                    }
287:                }
288:            }
289:        }
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