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annotate src/org/eclipse/jetty/server/handler/ErrorHandler.java @ 819:17bd0b170ed6

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remove Atomics
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 09 Sep 2016 17:10:47 -0600
parents 3428c60d7cfc
children 8e9db0bbf4f9
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.server.handler;
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20
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21 import java.io.IOException;
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22 import java.io.PrintWriter;
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23 import java.io.StringWriter;
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24 import java.io.Writer;
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25
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26 import javax.servlet.ServletException;
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27 import javax.servlet.http.HttpServletRequest;
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28 import javax.servlet.http.HttpServletResponse;
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29
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30 import org.eclipse.jetty.http.HttpHeaders;
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31 import org.eclipse.jetty.http.HttpMethods;
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32 import org.eclipse.jetty.http.HttpStatus;
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33 import org.eclipse.jetty.http.MimeTypes;
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34 import org.eclipse.jetty.server.AbstractHttpConnection;
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35 import org.eclipse.jetty.server.Dispatcher;
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36 import org.eclipse.jetty.server.Request;
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37 import org.eclipse.jetty.util.ByteArrayISO8859Writer;
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38 import org.eclipse.jetty.util.log.Log;
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39 import org.eclipse.jetty.util.log.Logger;
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40
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41 /* ------------------------------------------------------------ */
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42 /** Handler for Error pages
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43 * An ErrorHandler is registered with {@link ContextHandler#setErrorHandler(ErrorHandler)} or
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44 * {@link org.eclipse.jetty.server.Server#addBean(Object)}.
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45 * It is called by the HttpResponse.sendError method to write a error page.
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46 *
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47 */
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48 public class ErrorHandler extends AbstractHandler
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49 {
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50 private static final Logger LOG = Log.getLogger(ErrorHandler.class);
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51 public final static String ERROR_PAGE="org.eclipse.jetty.server.error_page";
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52
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53 boolean _showStacks=true;
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54 boolean _showMessageInTitle=true;
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55 String _cacheControl="must-revalidate,no-cache,no-store";
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56
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57 /* ------------------------------------------------------------ */
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58 /*
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59 * @see org.eclipse.jetty.server.server.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
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60 */
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61 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException
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62 {
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63 AbstractHttpConnection connection = AbstractHttpConnection.getCurrentConnection();
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64 String method = request.getMethod();
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65 if(!method.equals(HttpMethods.GET) && !method.equals(HttpMethods.POST) && !method.equals(HttpMethods.HEAD))
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66 {
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67 connection.getRequest().setHandled(true);
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68 return;
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69 }
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70
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71 if (this instanceof ErrorPageMapper)
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72 {
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73 String error_page=((ErrorPageMapper)this).getErrorPage(request);
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74 if (error_page!=null && request.getServletContext()!=null)
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75 {
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76 String old_error_page=(String)request.getAttribute(ERROR_PAGE);
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77 if (old_error_page==null || !old_error_page.equals(error_page))
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78 {
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79 request.setAttribute(ERROR_PAGE, error_page);
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80
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81 Dispatcher dispatcher = (Dispatcher) request.getServletContext().getRequestDispatcher(error_page);
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82 try
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83 {
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84 if(dispatcher!=null)
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85 {
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86 dispatcher.error(request, response);
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87 return;
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88 }
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89 LOG.warn("No error page "+error_page);
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90 }
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91 catch (ServletException e)
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92 {
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93 LOG.warn(Log.EXCEPTION, e);
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94 return;
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95 }
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96 }
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97 }
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98 }
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99
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100 connection.getRequest().setHandled(true);
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101 response.setContentType(MimeTypes.TEXT_HTML_8859_1);
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102 if (_cacheControl!=null)
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103 response.setHeader(HttpHeaders.CACHE_CONTROL, _cacheControl);
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104 ByteArrayISO8859Writer writer= new ByteArrayISO8859Writer(4096);
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105 handleErrorPage(request, writer, connection.getResponse().getStatus(), connection.getResponse().getReason());
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106 writer.flush();
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107 response.setContentLength(writer.size());
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108 writer.writeTo(response.getOutputStream());
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109 writer.destroy();
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110 }
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111
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112 /* ------------------------------------------------------------ */
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113 protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message)
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114 throws IOException
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115 {
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116 writeErrorPage(request, writer, code, message, _showStacks);
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117 }
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118
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119 /* ------------------------------------------------------------ */
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120 protected void writeErrorPage(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
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121 throws IOException
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122 {
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123 if (message == null)
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124 message=HttpStatus.getMessage(code);
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125
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126 writer.write("<html>\n<head>\n");
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127 writeErrorPageHead(request,writer,code,message);
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128 writer.write("</head>\n<body>");
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129 writeErrorPageBody(request,writer,code,message,showStacks);
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130 writer.write("\n</body>\n</html>\n");
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131 }
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132
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133 /* ------------------------------------------------------------ */
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134 protected void writeErrorPageHead(HttpServletRequest request, Writer writer, int code, String message)
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135 throws IOException
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136 {
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137 writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\"/>\n");
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138 writer.write("<title>Error ");
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139 writer.write(Integer.toString(code));
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140
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141 if (_showMessageInTitle)
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142 {
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143 writer.write(' ');
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144 write(writer,message);
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145 }
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146 writer.write("</title>\n");
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147 }
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148
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149 /* ------------------------------------------------------------ */
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150 protected void writeErrorPageBody(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
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151 throws IOException
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152 {
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153 String uri= request.getRequestURI();
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154
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155 writeErrorPageMessage(request,writer,code,message,uri);
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156 if (showStacks)
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157 writeErrorPageStacks(request,writer);
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158 writer.write("<hr /><i><small>Powered by Jetty://</small></i>");
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159 for (int i= 0; i < 20; i++)
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160 writer.write("<br/> \n");
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161 }
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162
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163 /* ------------------------------------------------------------ */
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164 protected void writeErrorPageMessage(HttpServletRequest request, Writer writer, int code, String message,String uri)
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165 throws IOException
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166 {
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167 writer.write("<h2>HTTP ERROR ");
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168 writer.write(Integer.toString(code));
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169 writer.write("</h2>\n<p>Problem accessing ");
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170 write(writer,uri);
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171 writer.write(". Reason:\n<pre> ");
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172 write(writer,message);
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173 writer.write("</pre></p>");
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174 }
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175
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176 /* ------------------------------------------------------------ */
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177 protected void writeErrorPageStacks(HttpServletRequest request, Writer writer)
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178 throws IOException
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179 {
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180 Throwable th = (Throwable)request.getAttribute("javax.servlet.error.exception");
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181 while(th!=null)
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182 {
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183 writer.write("<h3>Caused by:</h3><pre>");
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184 StringWriter sw = new StringWriter();
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185 PrintWriter pw = new PrintWriter(sw);
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186 th.printStackTrace(pw);
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187 pw.flush();
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188 write(writer,sw.getBuffer().toString());
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189 writer.write("</pre>\n");
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190
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191 th =th.getCause();
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192 }
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193 }
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194
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195
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196 /* ------------------------------------------------------------ */
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197 /** Get the cacheControl.
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198 * @return the cacheControl header to set on error responses.
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199 */
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200 public String getCacheControl()
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201 {
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202 return _cacheControl;
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203 }
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204
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205 /* ------------------------------------------------------------ */
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206 /** Set the cacheControl.
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207 * @param cacheControl the cacheControl header to set on error responses.
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208 */
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209 public void setCacheControl(String cacheControl)
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210 {
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211 _cacheControl = cacheControl;
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212 }
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213
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214 /* ------------------------------------------------------------ */
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215 /**
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216 * @return True if stack traces are shown in the error pages
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217 */
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218 public boolean isShowStacks()
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219 {
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220 return _showStacks;
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221 }
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222
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223 /* ------------------------------------------------------------ */
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224 /**
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225 * @param showStacks True if stack traces are shown in the error pages
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226 */
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227 public void setShowStacks(boolean showStacks)
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228 {
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229 _showStacks = showStacks;
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230 }
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231
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232 /* ------------------------------------------------------------ */
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233 /**
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234 * @param showMessageInTitle if true, the error message appears in page title
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235 */
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236 public void setShowMessageInTitle(boolean showMessageInTitle)
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237 {
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238 _showMessageInTitle = showMessageInTitle;
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239 }
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240
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241
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242 /* ------------------------------------------------------------ */
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243 public boolean getShowMessageInTitle()
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244 {
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245 return _showMessageInTitle;
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246 }
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247
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248 /* ------------------------------------------------------------ */
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249 protected void write(Writer writer,String string)
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250 throws IOException
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251 {
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252 if (string==null)
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253 return;
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254
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255 for (int i=0;i<string.length();i++)
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256 {
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257 char c=string.charAt(i);
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258
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259 switch(c)
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260 {
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261 case '&' :
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262 writer.write("&amp;");
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263 break;
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264 case '<' :
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265 writer.write("&lt;");
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266 break;
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267 case '>' :
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268 writer.write("&gt;");
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269 break;
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270
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271 default:
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272 if (Character.isISOControl(c) && !Character.isWhitespace(c))
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273 writer.write('?');
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274 else
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275 writer.write(c);
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276 }
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277 }
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278 }
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279
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280 /* ------------------------------------------------------------ */
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281 public interface ErrorPageMapper
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282 {
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283 String getErrorPage(HttpServletRequest request);
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284 }
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285 }