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