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19 package org.eclipse.jetty.server.handler;
20
21 import java.io.IOException;
22 import java.io.PrintWriter;
23 import java.io.StringWriter;
24 import java.io.Writer;
25
26 import javax.activation.MimeType;
27 import javax.servlet.ServletException;
28 import javax.servlet.http.HttpServletRequest;
29 import javax.servlet.http.HttpServletResponse;
30
31 import org.eclipse.jetty.http.HttpHeader;
32 import org.eclipse.jetty.http.HttpMethod;
33 import org.eclipse.jetty.http.HttpStatus;
34 import org.eclipse.jetty.http.MimeTypes;
35 import org.eclipse.jetty.server.Dispatcher;
36 import org.eclipse.jetty.server.Request;
37 import org.eclipse.jetty.server.Response;
38 import org.eclipse.jetty.util.ByteArrayISO8859Writer;
39 import org.eclipse.jetty.util.log.Log;
40 import org.eclipse.jetty.util.log.Logger;
41
42
43
44
45
46
47
48
49 public class ErrorHandler extends AbstractHandler
50 {
51 private static final Logger LOG = Log.getLogger(ErrorHandler.class);
52 public final static String ERROR_PAGE="org.eclipse.jetty.server.error_page";
53
54 boolean _showStacks=true;
55 boolean _showMessageInTitle=true;
56 String _cacheControl="must-revalidate,no-cache,no-store";
57
58
59
60
61
62 @Override
63 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException
64 {
65 String method = request.getMethod();
66 if (!HttpMethod.GET.is(method) && !HttpMethod.POST.is(method) && !HttpMethod.HEAD.is(method))
67 {
68 baseRequest.setHandled(true);
69 return;
70 }
71
72 if (this instanceof ErrorPageMapper)
73 {
74 String error_page=((ErrorPageMapper)this).getErrorPage(request);
75 if (error_page!=null && request.getServletContext()!=null)
76 {
77 String old_error_page=(String)request.getAttribute(ERROR_PAGE);
78 if (old_error_page==null || !old_error_page.equals(error_page))
79 {
80 request.setAttribute(ERROR_PAGE, error_page);
81
82 Dispatcher dispatcher = (Dispatcher) request.getServletContext().getRequestDispatcher(error_page);
83 try
84 {
85 if(dispatcher!=null)
86 {
87 dispatcher.error(request, response);
88 return;
89 }
90 LOG.warn("No error page "+error_page);
91 }
92 catch (ServletException e)
93 {
94 LOG.warn(Log.EXCEPTION, e);
95 return;
96 }
97 }
98 }
99 }
100
101 baseRequest.setHandled(true);
102 response.setContentType(MimeTypes.Type.TEXT_HTML_8859_1.asString());
103 if (_cacheControl!=null)
104 response.setHeader(HttpHeader.CACHE_CONTROL.asString(), _cacheControl);
105 ByteArrayISO8859Writer writer= new ByteArrayISO8859Writer(4096);
106 String reason=(response instanceof Response)?((Response)response).getReason():null;
107 handleErrorPage(request, writer, response.getStatus(), reason);
108 writer.flush();
109 response.setContentLength(writer.size());
110 writer.writeTo(response.getOutputStream());
111 writer.destroy();
112 }
113
114
115 protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message)
116 throws IOException
117 {
118 writeErrorPage(request, writer, code, message, _showStacks);
119 }
120
121
122 protected void writeErrorPage(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
123 throws IOException
124 {
125 if (message == null)
126 message=HttpStatus.getMessage(code);
127
128 writer.write("<html>\n<head>\n");
129 writeErrorPageHead(request,writer,code,message);
130 writer.write("</head>\n<body>");
131 writeErrorPageBody(request,writer,code,message,showStacks);
132 writer.write("\n</body>\n</html>\n");
133 }
134
135
136 protected void writeErrorPageHead(HttpServletRequest request, Writer writer, int code, String message)
137 throws IOException
138 {
139 writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\"/>\n");
140 writer.write("<title>Error ");
141 writer.write(Integer.toString(code));
142
143 if (_showMessageInTitle)
144 {
145 writer.write(' ');
146 write(writer,message);
147 }
148 writer.write("</title>\n");
149 }
150
151
152 protected void writeErrorPageBody(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
153 throws IOException
154 {
155 String uri= request.getRequestURI();
156
157 writeErrorPageMessage(request,writer,code,message,uri);
158 if (showStacks)
159 writeErrorPageStacks(request,writer);
160 writer.write("<hr><i><small>Powered by Jetty://</small></i><hr/>\n");
161 }
162
163
164 protected void writeErrorPageMessage(HttpServletRequest request, Writer writer, int code, String message,String uri)
165 throws IOException
166 {
167 writer.write("<h2>HTTP ERROR ");
168 writer.write(Integer.toString(code));
169 writer.write("</h2>\n<p>Problem accessing ");
170 write(writer,uri);
171 writer.write(". Reason:\n<pre> ");
172 write(writer,message);
173 writer.write("</pre></p>");
174 }
175
176
177 protected void writeErrorPageStacks(HttpServletRequest request, Writer writer)
178 throws IOException
179 {
180 Throwable th = (Throwable)request.getAttribute("javax.servlet.error.exception");
181 while(th!=null)
182 {
183 writer.write("<h3>Caused by:</h3><pre>");
184 StringWriter sw = new StringWriter();
185 PrintWriter pw = new PrintWriter(sw);
186 th.printStackTrace(pw);
187 pw.flush();
188 write(writer,sw.getBuffer().toString());
189 writer.write("</pre>\n");
190
191 th =th.getCause();
192 }
193 }
194
195
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197
198
199
200 public String getCacheControl()
201 {
202 return _cacheControl;
203 }
204
205
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208
209 public void setCacheControl(String cacheControl)
210 {
211 _cacheControl = cacheControl;
212 }
213
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215
216
217
218 public boolean isShowStacks()
219 {
220 return _showStacks;
221 }
222
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225
226
227 public void setShowStacks(boolean showStacks)
228 {
229 _showStacks = showStacks;
230 }
231
232
233
234
235
236 public void setShowMessageInTitle(boolean showMessageInTitle)
237 {
238 _showMessageInTitle = showMessageInTitle;
239 }
240
241
242
243 public boolean getShowMessageInTitle()
244 {
245 return _showMessageInTitle;
246 }
247
248
249 protected void write(Writer writer,String string)
250 throws IOException
251 {
252 if (string==null)
253 return;
254
255 for (int i=0;i<string.length();i++)
256 {
257 char c=string.charAt(i);
258
259 switch(c)
260 {
261 case '&' :
262 writer.write("&");
263 break;
264 case '<' :
265 writer.write("<");
266 break;
267 case '>' :
268 writer.write(">");
269 break;
270
271 default:
272 if (Character.isISOControl(c) && !Character.isWhitespace(c))
273 writer.write('?');
274 else
275 writer.write(c);
276 }
277 }
278 }
279
280
281 public interface ErrorPageMapper
282 {
283 String getErrorPage(HttpServletRequest request);
284 }
285 }