EclipseConnection


1   /*******************************************************************************
2    * Copyright (c) 2000, 2006 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.help.internal.standalone;
12  
13  import java.io.*;
14  import java.net.*;
15  import java.util.Properties  ;
16  
17  import javax.net.ssl.HostnameVerifier;
18  import javax.net.ssl.HttpsURLConnection;
19  
20  /**
21   * This program is used to start or stop Eclipse Infocenter application. It
22   * should be launched from command line.
23   */
24  public class EclipseConnection {
25      // help server host
26      private String   host;
27      // help server port
28      private String   port;
29  
30      public EclipseConnection() {
31      }
32  
33      public String   getPort() {
34          return port;
35      }
36  
37      public String   getHost() {
38          return host;
39      }
40  
41      public void reset() {
42          host = null;
43          port = null;
44      }
45  
46      public boolean isValid() {
47          return (host != null && port != null);
48      }
49  
50      public void connect(URL url) throws InterruptedException  , Exception   {
51          try {
52              HttpURLConnection connection = (HttpURLConnection) url
53                      .openConnection();
54              if (connection instanceof HttpsURLConnection) {
55                  HttpsURLConnection secureConnection = (HttpsURLConnection) connection;
56                  // The following allows the connection to
57                  // continue even if the default rules for
58                  // URL hostname verification fail.
59                  secureConnection.setHostnameVerifier(new HostnameVerifier() {
60                      public boolean verify(String   urlHostName, javax.net.ssl.SSLSession session) {
61                          if (Options.isDebug()) {
62                              System.out.println("Warning: URL Host: " //$NON-NLS-1$
63                                      + urlHostName + " vs. " //$NON-NLS-1$
64                                      + session.getPeerHost());                           
65                          }
66                          return true;
67                      }
68                  });
69              }
70              if (Options.isDebug()) {
71                  System.out.println("Connection  to control servlet created."); //$NON-NLS-1$
72              }
73              connection.connect();
74              if (Options.isDebug()) {
75                  System.out.println("Connection  to control servlet connected."); //$NON-NLS-1$
76              }
77              int code = connection.getResponseCode();
78              if (Options.isDebug()) {
79                  System.out
80                          .println("Response code from control servlet=" + code); //$NON-NLS-1$
81              }
82              connection.disconnect();
83              if (code == HttpURLConnection.HTTP_MOVED_TEMP) {
84                  // Redirect from server.
85                  String   redirectLocation = connection.getHeaderField("location"); //$NON-NLS-1$
86                  URL redirectURL = new URL(redirectLocation);
87                  if (url.equals(redirectURL)) {
88                      if (Options.isDebug()) {
89                          System.out.println("Redirecting to the same URL! " //$NON-NLS-1$
90                                  + redirectLocation);
91                      }
92                      return;
93                  }
94                  if (Options.isDebug()) {
95                      System.out.println("Follows redirect to " + redirectLocation); //$NON_NLS-1$ //$NON-NLS-1$
96                  }
97                  connect(redirectURL);
98              }
99              return;
100         } catch (IOException ioe) {
101             if (Options.isDebug()) {
102                 ioe.printStackTrace();
103             }
104         }
105     }
106 
107     /**
108      * Obtains host and port from the file. Retries several times if file does
109      * not exists, and help might be starting up.
110      */
111     public void renew() throws Exception   {
112         Properties   p = new Properties  ();
113         FileInputStream is = null;
114         try {
115             is = new FileInputStream(Options.getConnectionFile());
116             p.load(is);
117             is.close();
118         } catch (IOException ioe) {
119             // it is ok, eclipse might have just exited
120             throw ioe;
121         } finally {
122             if (is != null) {
123                 try {
124                     is.close();
125                 } catch (IOException ioe2) {
126                 }
127             }
128         }
129         host = (String  ) p.get("host"); //$NON-NLS-1$
130         port = (String  ) p.get("port"); //$NON-NLS-1$
131         if (Options.isDebug()) {
132             System.out.println("Help server host=" + host); //$NON-NLS-1$
133         }
134         if (Options.isDebug()) {
135             System.out.println("Help server port=" + port); //$NON-NLS-1$
136         }
137     }
138 
139 }
140
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