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annotate src/org/eclipse/jetty/server/handler/ErrorHandler.java @ 882:d850a5e6ff15

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remove UncheckedPrintWriter
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 04 Oct 2016 16:12:50 -0600
parents 0048a843297a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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.Request;
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36 import org.eclipse.jetty.util.ByteArrayISO8859Writer;
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37 import org.slf4j.Logger;
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38 import org.slf4j.LoggerFactory;
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39
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40 /* ------------------------------------------------------------ */
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41 /** Handler for Error pages
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42 * An ErrorHandler is registered with {@link ContextHandler#setErrorHandler(ErrorHandler)} or
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43 * {@link org.eclipse.jetty.server.Server#addBean(Object)}.
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44 * It is called by the HttpResponse.sendError method to write a error page.
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45 *
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46 */
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47 public class ErrorHandler extends AbstractHandler
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48 {
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49 private static final Logger LOG = LoggerFactory.getLogger(ErrorHandler.class);
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50 public final static String ERROR_PAGE="org.eclipse.jetty.server.error_page";
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51
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52 boolean _showStacks=true;
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53 boolean _showMessageInTitle=true;
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54 String _cacheControl="must-revalidate,no-cache,no-store";
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55
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56 /* ------------------------------------------------------------ */
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57 /*
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58 * @see org.eclipse.jetty.server.server.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
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59 */
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60 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException
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61 {
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62 AbstractHttpConnection connection = AbstractHttpConnection.getCurrentConnection();
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63 String method = request.getMethod();
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64 if(!method.equals(HttpMethods.GET) && !method.equals(HttpMethods.POST) && !method.equals(HttpMethods.HEAD))
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65 {
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66 connection.getRequest().setHandled(true);
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67 return;
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68 }
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69
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70 connection.getRequest().setHandled(true);
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71 response.setContentType(MimeTypes.TEXT_HTML_8859_1);
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72 if (_cacheControl!=null)
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73 response.setHeader(HttpHeaders.CACHE_CONTROL, _cacheControl);
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74 ByteArrayISO8859Writer writer= new ByteArrayISO8859Writer(4096);
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75 handleErrorPage(request, writer, connection.getResponse().getStatus(), connection.getResponse().getReason());
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76 writer.flush();
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77 response.setContentLength(writer.size());
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78 writer.writeTo(response.getOutputStream());
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79 writer.destroy();
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80 }
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81
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82 /* ------------------------------------------------------------ */
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83 protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message)
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84 throws IOException
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85 {
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86 writeErrorPage(request, writer, code, message, _showStacks);
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87 }
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88
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89 /* ------------------------------------------------------------ */
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90 protected void writeErrorPage(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
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91 throws IOException
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92 {
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93 if (message == null)
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94 message=HttpStatus.getMessage(code);
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95
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96 writer.write("<html>\n<head>\n");
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97 writeErrorPageHead(request,writer,code,message);
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98 writer.write("</head>\n<body>");
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99 writeErrorPageBody(request,writer,code,message,showStacks);
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100 writer.write("\n</body>\n</html>\n");
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101 }
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102
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103 /* ------------------------------------------------------------ */
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104 protected void writeErrorPageHead(HttpServletRequest request, Writer writer, int code, String message)
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105 throws IOException
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106 {
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107 writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\"/>\n");
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108 writer.write("<title>Error ");
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109 writer.write(Integer.toString(code));
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110
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111 if (_showMessageInTitle)
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112 {
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113 writer.write(' ');
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114 write(writer,message);
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115 }
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116 writer.write("</title>\n");
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117 }
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118
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119 /* ------------------------------------------------------------ */
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120 protected void writeErrorPageBody(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 String uri= request.getRequestURI();
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124
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125 writeErrorPageMessage(request,writer,code,message,uri);
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126 if (showStacks)
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127 writeErrorPageStacks(request,writer);
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128 writer.write("<hr /><i><small>Powered by Jetty://</small></i>");
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129 for (int i= 0; i < 20; i++)
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130 writer.write("<br/> \n");
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131 }
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132
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133 /* ------------------------------------------------------------ */
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134 protected void writeErrorPageMessage(HttpServletRequest request, Writer writer, int code, String message,String uri)
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135 throws IOException
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136 {
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137 writer.write("<h2>HTTP ERROR ");
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138 writer.write(Integer.toString(code));
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139 writer.write("</h2>\n<p>Problem accessing ");
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140 write(writer,uri);
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141 writer.write(". Reason:\n<pre> ");
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142 write(writer,message);
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143 writer.write("</pre></p>");
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144 }
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145
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146 /* ------------------------------------------------------------ */
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147 protected void writeErrorPageStacks(HttpServletRequest request, Writer writer)
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148 throws IOException
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149 {
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150 Throwable th = (Throwable)request.getAttribute("javax.servlet.error.exception");
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151 while(th!=null)
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152 {
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153 writer.write("<h3>Caused by:</h3><pre>");
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154 StringWriter sw = new StringWriter();
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155 PrintWriter pw = new PrintWriter(sw);
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156 th.printStackTrace(pw);
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157 pw.flush();
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158 write(writer,sw.getBuffer().toString());
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159 writer.write("</pre>\n");
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160
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161 th =th.getCause();
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162 }
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163 }
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164
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165
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166 /* ------------------------------------------------------------ */
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167 /** Get the cacheControl.
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168 * @return the cacheControl header to set on error responses.
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169 */
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170 public String getCacheControl()
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171 {
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172 return _cacheControl;
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173 }
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174
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175 /* ------------------------------------------------------------ */
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176 /** Set the cacheControl.
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177 * @param cacheControl the cacheControl header to set on error responses.
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178 */
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179 public void setCacheControl(String cacheControl)
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180 {
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181 _cacheControl = cacheControl;
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182 }
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183
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184 /* ------------------------------------------------------------ */
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185 /**
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186 * @return True if stack traces are shown in the error pages
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187 */
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188 public boolean isShowStacks()
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189 {
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190 return _showStacks;
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191 }
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192
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193 /* ------------------------------------------------------------ */
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194 /**
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195 * @param showStacks True if stack traces are shown in the error pages
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196 */
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197 public void setShowStacks(boolean showStacks)
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198 {
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199 _showStacks = showStacks;
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200 }
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201
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202 /* ------------------------------------------------------------ */
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203 /**
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204 * @param showMessageInTitle if true, the error message appears in page title
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205 */
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206 public void setShowMessageInTitle(boolean showMessageInTitle)
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207 {
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208 _showMessageInTitle = showMessageInTitle;
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209 }
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210
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211
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212 /* ------------------------------------------------------------ */
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213 public boolean getShowMessageInTitle()
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214 {
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215 return _showMessageInTitle;
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216 }
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217
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218 /* ------------------------------------------------------------ */
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219 protected void write(Writer writer,String string)
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220 throws IOException
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221 {
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222 if (string==null)
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223 return;
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224
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225 for (int i=0;i<string.length();i++)
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226 {
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227 char c=string.charAt(i);
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228
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229 switch(c)
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230 {
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231 case '&' :
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232 writer.write("&amp;");
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233 break;
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234 case '<' :
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235 writer.write("&lt;");
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236 break;
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237 case '>' :
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238 writer.write("&gt;");
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239 break;
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240
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241 default:
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242 if (Character.isISOControl(c) && !Character.isWhitespace(c))
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243 writer.write('?');
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244 else
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245 writer.write(c);
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246 }
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247 }
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248 }
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249 }