itsecur-firewall/LogViewer.java

   1 import java.awt.*;
   2 import java.net.*;
   3 import java.io.*;
   4 import java.util.*;
   5 import java.applet.*;
   6
   7 public class LogViewer extends Applet implements Runnable,CbButtonCallback
   8 {
   9         TextArea log;
  10         StringBuffer logbuffer = new StringBuffer();
  11         LineInputStream is;
  12         Thread th;
  13         CbButton pause, button;
  14         boolean paused = false;
  15
  16         public void init()
  17         {
  18         // Create the UI
  19         setLayout(new BorderLayout());
  20         add("Center", log = new TextArea());
  21         log.setEditable(false);
  22         Util.setFont(new Font("TimesRoman", Font.PLAIN, 12));
  23         Panel bot = new Panel();
  24         bot.setBackground(Color.white);
  25         bot.setForeground(Color.white);
  26         bot.setLayout(new FlowLayout(FlowLayout.RIGHT));
  27         if (getParameter("pause") != null) {
  28                 // Add button to pause display
  29                 bot.add(pause = new CbButton("  Pause  ", this));
  30                 }
  31         if (getParameter("buttonname") != null) {
  32                 // Add button for some other purpose
  33                 bot.add(button = new CbButton(getParameter("buttonname"),this));
  34                 }
  35         add("South", bot);
  36         }
  37
  38         public void start()
  39         {
  40         // Start download thread
  41         log.setText("");
  42         th = new Thread(this);
  43         th.start();
  44         }
  45
  46         public void stop()
  47         {
  48         // Stop download
  49         try {
  50                 String killurl = getParameter("killurl");
  51                 if (killurl != null) {
  52                         // Call this CGI at stop time
  53                         try {
  54                                 URL u = new URL(getDocumentBase(), killurl);
  55                                 URLConnection uc = u.openConnection();
  56                                 String session = getParameter("session");
  57                                 if (session != null)
  58                                     uc.setRequestProperty("Cookie", session);
  59                                 uc.getInputStream().close();
  60                                 }
  61                         catch(Exception e2) { }
  62                         }
  63                 if (is != null) is.close();
  64                 if (th != null) th.stop();
  65                 }
  66         catch(Exception e) {
  67                 // ignore it
  68                 e.printStackTrace();
  69                 }
  70         }
  71
  72         public void run()
  73         {
  74         try {
  75                 URL u = new URL(getDocumentBase(), getParameter("url"));
  76                 URLConnection uc = u.openConnection();
  77                 String session = getParameter("session");
  78                 if (session != null)
  79                         uc.setRequestProperty("Cookie", session);
  80                 is = new LineInputStream(uc.getInputStream());
  81                 while(true) {
  82                         String l = is.gets();
  83                         append(l);
  84                         }
  85                 }
  86         catch(EOFException e) {
  87                 // end of file ..
  88                 }
  89         catch(IOException e) {
  90                 // shouldn't happen!
  91                 e.printStackTrace();
  92                 append("IO error : "+e.getMessage());
  93                 }
  94         }
  95
  96         int len = 0, oldlen = 0;
  97
  98         void append(String str) {
  99                 if (!paused) {
 100                         log.append((len == 0 ? "" : "\n")+str);
 101                         }
 102                 logbuffer.append((len == 0 ? "" : "\n")+str);
 103                 oldlen = len;
 104                 len += str.length()+1;
 105                 if (!paused) {
 106                         log.select(oldlen, oldlen);
 107                         }
 108         }
 109
 110         public void click(CbButton b) {
 111                 if (b == pause) {
 112                         if (paused) {
 113                                 // Resume display, and append missing text
 114                                 pause.setText("  Pause  ");
 115                                 log.setText(logbuffer.toString());
 116                                 log.select(oldlen, oldlen);
 117                         } else {
 118                                 // Stop display
 119                                 pause.setText("Resume");
 120                         }
 121                         paused = !paused;
 122                 } else if (b == button) {
 123                         // Open some page
 124                         try {
 125                                 URL u = new URL(getDocumentBase(),
 126                                                 getParameter("buttonlink"));
 127                                 getAppletContext().showDocument(u);
 128                                 }
 129                         catch(Exception e) { }
 130                 }
 131         }
 132 }
 133