1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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 import java.nio.ByteBuffer;
26
27 import javax.servlet.ServletException;
28 import javax.servlet.http.HttpServletRequest;
29 import javax.servlet.http.HttpServletResponse;
30
31 import org.eclipse.jetty.http.HttpFields;
32 import org.eclipse.jetty.http.HttpHeader;
33 import org.eclipse.jetty.http.HttpMethod;
34 import org.eclipse.jetty.http.HttpStatus;
35 import org.eclipse.jetty.http.MimeTypes;
36 import org.eclipse.jetty.server.Dispatcher;
37 import org.eclipse.jetty.server.Request;
38 import org.eclipse.jetty.server.Response;
39 import org.eclipse.jetty.server.Server;
40 import org.eclipse.jetty.util.BufferUtil;
41 import org.eclipse.jetty.util.ByteArrayISO8859Writer;
42 import org.eclipse.jetty.util.Jetty;
43 import org.eclipse.jetty.util.StringUtil;
44 import org.eclipse.jetty.util.log.Log;
45 import org.eclipse.jetty.util.log.Logger;
46
47
48
49
50
51
52
53
54
55 public class ErrorHandler extends AbstractHandler
56 {
57 private static final Logger LOG = Log.getLogger(ErrorHandler.class);
58 public final static String ERROR_PAGE="org.eclipse.jetty.server.error_page";
59
60 boolean _showStacks=true;
61 boolean _showMessageInTitle=true;
62 String _cacheControl="must-revalidate,no-cache,no-store";
63
64
65
66
67
68 @Override
69 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException
70 {
71 String method = request.getMethod();
72 if (!HttpMethod.GET.is(method) && !HttpMethod.POST.is(method) && !HttpMethod.HEAD.is(method))
73 {
74 baseRequest.setHandled(true);
75 return;
76 }
77
78 if (this instanceof ErrorPageMapper)
79 {
80 String error_page=((ErrorPageMapper)this).getErrorPage(request);
81 if (error_page!=null && request.getServletContext()!=null)
82 {
83 String old_error_page=(String)request.getAttribute(ERROR_PAGE);
84 if (old_error_page==null || !old_error_page.equals(error_page))
85 {
86 request.setAttribute(ERROR_PAGE, error_page);
87
88 Dispatcher dispatcher = (Dispatcher) request.getServletContext().getRequestDispatcher(error_page);
89 try
90 {
91 if(dispatcher!=null)
92 {
93 dispatcher.error(request, response);
94 return;
95 }
96 LOG.warn("No error page "+error_page);
97 }
98 catch (ServletException e)
99 {
100 LOG.warn(Log.EXCEPTION, e);
101 return;
102 }
103 }
104 }
105 }
106
107 baseRequest.setHandled(true);
108 response.setContentType(MimeTypes.Type.TEXT_HTML_8859_1.asString());
109 if (_cacheControl!=null)
110 response.setHeader(HttpHeader.CACHE_CONTROL.asString(), _cacheControl);
111 ByteArrayISO8859Writer writer= new ByteArrayISO8859Writer(4096);
112 String reason=(response instanceof Response)?((Response)response).getReason():null;
113 handleErrorPage(request, writer, response.getStatus(), reason);
114 writer.flush();
115 response.setContentLength(writer.size());
116 writer.writeTo(response.getOutputStream());
117 writer.destroy();
118 }
119
120
121 protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message)
122 throws IOException
123 {
124 writeErrorPage(request, writer, code, message, _showStacks);
125 }
126
127
128 protected void writeErrorPage(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
129 throws IOException
130 {
131 if (message == null)
132 message=HttpStatus.getMessage(code);
133
134 writer.write("<html>\n<head>\n");
135 writeErrorPageHead(request,writer,code,message);
136 writer.write("</head>\n<body>");
137 writeErrorPageBody(request,writer,code,message,showStacks);
138 writer.write("\n</body>\n</html>\n");
139 }
140
141
142 protected void writeErrorPageHead(HttpServletRequest request, Writer writer, int code, String message)
143 throws IOException
144 {
145 writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\"/>\n");
146 writer.write("<title>Error ");
147 writer.write(Integer.toString(code));
148
149 if (_showMessageInTitle)
150 {
151 writer.write(' ');
152 write(writer,message);
153 }
154 writer.write("</title>\n");
155 }
156
157
158 protected void writeErrorPageBody(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
159 throws IOException
160 {
161 String uri= request.getRequestURI();
162
163 writeErrorPageMessage(request,writer,code,message,uri);
164 if (showStacks)
165 writeErrorPageStacks(request,writer);
166
167 Request.getBaseRequest(request).getHttpChannel().getHttpConfiguration()
168 .writePoweredBy(writer,"<hr>","<hr/>\n");
169 }
170
171
172 protected void writeErrorPageMessage(HttpServletRequest request, Writer writer, int code, String message,String uri)
173 throws IOException
174 {
175 writer.write("<h2>HTTP ERROR ");
176 writer.write(Integer.toString(code));
177 writer.write("</h2>\n<p>Problem accessing ");
178 write(writer,uri);
179 writer.write(". Reason:\n<pre> ");
180 write(writer,message);
181 writer.write("</pre></p>");
182 }
183
184
185 protected void writeErrorPageStacks(HttpServletRequest request, Writer writer)
186 throws IOException
187 {
188 Throwable th = (Throwable)request.getAttribute("javax.servlet.error.exception");
189 while(th!=null)
190 {
191 writer.write("<h3>Caused by:</h3><pre>");
192 StringWriter sw = new StringWriter();
193 PrintWriter pw = new PrintWriter(sw);
194 th.printStackTrace(pw);
195 pw.flush();
196 write(writer,sw.getBuffer().toString());
197 writer.write("</pre>\n");
198
199 th =th.getCause();
200 }
201 }
202
203
204
205
206
207
208
209
210
211
212
213
214
215 public ByteBuffer badMessageError(int status, String reason, HttpFields fields)
216 {
217 if (reason==null)
218 reason=HttpStatus.getMessage(status);
219 fields.put(HttpHeader.CONTENT_TYPE,MimeTypes.Type.TEXT_HTML_8859_1.asString());
220 return BufferUtil.toBuffer("<h1>Bad Message " + status + "</h1><pre>reason: " + reason + "</pre>");
221 }
222
223
224
225
226
227 public String getCacheControl()
228 {
229 return _cacheControl;
230 }
231
232
233
234
235
236 public void setCacheControl(String cacheControl)
237 {
238 _cacheControl = cacheControl;
239 }
240
241
242
243
244
245 public boolean isShowStacks()
246 {
247 return _showStacks;
248 }
249
250
251
252
253
254 public void setShowStacks(boolean showStacks)
255 {
256 _showStacks = showStacks;
257 }
258
259
260
261
262
263 public void setShowMessageInTitle(boolean showMessageInTitle)
264 {
265 _showMessageInTitle = showMessageInTitle;
266 }
267
268
269
270 public boolean getShowMessageInTitle()
271 {
272 return _showMessageInTitle;
273 }
274
275
276 protected void write(Writer writer,String string)
277 throws IOException
278 {
279 if (string==null)
280 return;
281
282 writer.write(StringUtil.sanitizeXmlString(string));
283 }
284
285
286 public interface ErrorPageMapper
287 {
288 String getErrorPage(HttpServletRequest request);
289 }
290
291
292 public static ErrorHandler getErrorHandler(Server server, ContextHandler context)
293 {
294 ErrorHandler error_handler=null;
295 if (context!=null)
296 error_handler=context.getErrorHandler();
297 if (error_handler==null && server!=null)
298 error_handler = server.getBean(ErrorHandler.class);
299 return error_handler;
300 }
301 }