--- /dev/null
+//
+// ========================================================================
+// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
+// ------------------------------------------------------------------------
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the Eclipse Public License v1.0
+// and Apache License v2.0 which accompanies this distribution.
+//
+// The Eclipse Public License is available at
+// http://www.eclipse.org/legal/epl-v10.html
+//
+// The Apache License v2.0 is available at
+// http://www.opensource.org/licenses/apache2.0.php
+//
+// You may elect to redistribute this code under either of these licenses.
+// ========================================================================
+//
+
+package org.eclipse.jetty.server.handler;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.nio.ByteBuffer;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.eclipse.jetty.http.HttpFields;
+import org.eclipse.jetty.http.HttpHeader;
+import org.eclipse.jetty.http.HttpMethod;
+import org.eclipse.jetty.http.HttpStatus;
+import org.eclipse.jetty.http.MimeTypes;
+import org.eclipse.jetty.server.Dispatcher;
+import org.eclipse.jetty.server.Request;
+import org.eclipse.jetty.server.Response;
+import org.eclipse.jetty.server.Server;
+import org.eclipse.jetty.util.BufferUtil;
+import org.eclipse.jetty.util.ByteArrayISO8859Writer;
+import org.eclipse.jetty.util.log.Log;
+import org.eclipse.jetty.util.log.Logger;
+
+/* ------------------------------------------------------------ */
+/** Handler for Error pages
+ * An ErrorHandler is registered with {@link ContextHandler#setErrorHandler(ErrorHandler)} or
+ * {@link org.eclipse.jetty.server.Server#addBean(Object)}.
+ * It is called by the HttpResponse.sendError method to write a error page via {@link #handle(String, Request, HttpServletRequest, HttpServletResponse)}
+ * or via {@link #badMessageError(int, String, HttpFields)} for bad requests for which a dispatch cannot be done.
+ *
+ */
+public class ErrorHandler extends AbstractHandler
+{
+ private static final Logger LOG = Log.getLogger(ErrorHandler.class);
+ public final static String ERROR_PAGE="org.eclipse.jetty.server.error_page";
+
+ boolean _showStacks=true;
+ boolean _showMessageInTitle=true;
+ String _cacheControl="must-revalidate,no-cache,no-store";
+
+ /* ------------------------------------------------------------ */
+ /*
+ * @see org.eclipse.jetty.server.server.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
+ */
+ @Override
+ public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException
+ {
+ String method = request.getMethod();
+ if (!HttpMethod.GET.is(method) && !HttpMethod.POST.is(method) && !HttpMethod.HEAD.is(method))
+ {
+ baseRequest.setHandled(true);
+ return;
+ }
+
+ if (this instanceof ErrorPageMapper)
+ {
+ String error_page=((ErrorPageMapper)this).getErrorPage(request);
+ if (error_page!=null && request.getServletContext()!=null)
+ {
+ String old_error_page=(String)request.getAttribute(ERROR_PAGE);
+ if (old_error_page==null || !old_error_page.equals(error_page))
+ {
+ request.setAttribute(ERROR_PAGE, error_page);
+
+ Dispatcher dispatcher = (Dispatcher) request.getServletContext().getRequestDispatcher(error_page);
+ try
+ {
+ if(dispatcher!=null)
+ {
+ dispatcher.error(request, response);
+ return;
+ }
+ LOG.warn("No error page "+error_page);
+ }
+ catch (ServletException e)
+ {
+ LOG.warn(Log.EXCEPTION, e);
+ return;
+ }
+ }
+ }
+ }
+
+ baseRequest.setHandled(true);
+ response.setContentType(MimeTypes.Type.TEXT_HTML_8859_1.asString());
+ if (_cacheControl!=null)
+ response.setHeader(HttpHeader.CACHE_CONTROL.asString(), _cacheControl);
+ ByteArrayISO8859Writer writer= new ByteArrayISO8859Writer(4096);
+ String reason=(response instanceof Response)?((Response)response).getReason():null;
+ handleErrorPage(request, writer, response.getStatus(), reason);
+ writer.flush();
+ response.setContentLength(writer.size());
+ writer.writeTo(response.getOutputStream());
+ writer.destroy();
+ }
+
+ /* ------------------------------------------------------------ */
+ protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message)
+ throws IOException
+ {
+ writeErrorPage(request, writer, code, message, _showStacks);
+ }
+
+ /* ------------------------------------------------------------ */
+ protected void writeErrorPage(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
+ throws IOException
+ {
+ if (message == null)
+ message=HttpStatus.getMessage(code);
+
+ writer.write("<html>\n<head>\n");
+ writeErrorPageHead(request,writer,code,message);
+ writer.write("</head>\n<body>");
+ writeErrorPageBody(request,writer,code,message,showStacks);
+ writer.write("\n</body>\n</html>\n");
+ }
+
+ /* ------------------------------------------------------------ */
+ protected void writeErrorPageHead(HttpServletRequest request, Writer writer, int code, String message)
+ throws IOException
+ {
+ writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\"/>\n");
+ writer.write("<title>Error ");
+ writer.write(Integer.toString(code));
+
+ if (_showMessageInTitle)
+ {
+ writer.write(' ');
+ write(writer,message);
+ }
+ writer.write("</title>\n");
+ }
+
+ /* ------------------------------------------------------------ */
+ protected void writeErrorPageBody(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
+ throws IOException
+ {
+ String uri= request.getRequestURI();
+
+ writeErrorPageMessage(request,writer,code,message,uri);
+ if (showStacks)
+ writeErrorPageStacks(request,writer);
+ writer.write("<hr><i><small>Powered by Jetty://</small></i><hr/>\n");
+ }
+
+ /* ------------------------------------------------------------ */
+ protected void writeErrorPageMessage(HttpServletRequest request, Writer writer, int code, String message,String uri)
+ throws IOException
+ {
+ writer.write("<h2>HTTP ERROR ");
+ writer.write(Integer.toString(code));
+ writer.write("</h2>\n<p>Problem accessing ");
+ write(writer,uri);
+ writer.write(". Reason:\n<pre> ");
+ write(writer,message);
+ writer.write("</pre></p>");
+ }
+
+ /* ------------------------------------------------------------ */
+ protected void writeErrorPageStacks(HttpServletRequest request, Writer writer)
+ throws IOException
+ {
+ Throwable th = (Throwable)request.getAttribute("javax.servlet.error.exception");
+ while(th!=null)
+ {
+ writer.write("<h3>Caused by:</h3><pre>");
+ StringWriter sw = new StringWriter();
+ PrintWriter pw = new PrintWriter(sw);
+ th.printStackTrace(pw);
+ pw.flush();
+ write(writer,sw.getBuffer().toString());
+ writer.write("</pre>\n");
+
+ th =th.getCause();
+ }
+ }
+
+ /* ------------------------------------------------------------ */
+ /** Bad Message Error body
+ * <p>Generate a error response body to be sent for a bad message.
+ * In this case there is something wrong with the request, so either
+ * a request cannot be built, or it is not safe to build a request.
+ * This method allows for a simple error page body to be returned
+ * and some response headers to be set.
+ * @param status The error code that will be sent
+ * @param reason The reason for the error code (may be null)
+ * @param fields The header fields that will be sent with the response.
+ * @return The content as a ByteBuffer, or null for no body.
+ */
+ public ByteBuffer badMessageError(int status, String reason, HttpFields fields)
+ {
+ if (reason==null)
+ reason=HttpStatus.getMessage(status);
+ fields.put(HttpHeader.CONTENT_TYPE,MimeTypes.Type.TEXT_HTML_8859_1.asString());
+ return BufferUtil.toBuffer("<h1>Bad Message " + status + "</h1><pre>reason: " + reason + "</pre>");
+ }
+
+ /* ------------------------------------------------------------ */
+ /** Get the cacheControl.
+ * @return the cacheControl header to set on error responses.
+ */
+ public String getCacheControl()
+ {
+ return _cacheControl;
+ }
+
+ /* ------------------------------------------------------------ */
+ /** Set the cacheControl.
+ * @param cacheControl the cacheControl header to set on error responses.
+ */
+ public void setCacheControl(String cacheControl)
+ {
+ _cacheControl = cacheControl;
+ }
+
+ /* ------------------------------------------------------------ */
+ /**
+ * @return True if stack traces are shown in the error pages
+ */
+ public boolean isShowStacks()
+ {
+ return _showStacks;
+ }
+
+ /* ------------------------------------------------------------ */
+ /**
+ * @param showStacks True if stack traces are shown in the error pages
+ */
+ public void setShowStacks(boolean showStacks)
+ {
+ _showStacks = showStacks;
+ }
+
+ /* ------------------------------------------------------------ */
+ /**
+ * @param showMessageInTitle if true, the error message appears in page title
+ */
+ public void setShowMessageInTitle(boolean showMessageInTitle)
+ {
+ _showMessageInTitle = showMessageInTitle;
+ }
+
+
+ /* ------------------------------------------------------------ */
+ public boolean getShowMessageInTitle()
+ {
+ return _showMessageInTitle;
+ }
+
+ /* ------------------------------------------------------------ */
+ protected void write(Writer writer,String string)
+ throws IOException
+ {
+ if (string==null)
+ return;
+
+ for (int i=0;i<string.length();i++)
+ {
+ char c=string.charAt(i);
+
+ switch(c)
+ {
+ case '&' :
+ writer.write("&");
+ break;
+ case '<' :
+ writer.write("<");
+ break;
+ case '>' :
+ writer.write(">");
+ break;
+
+ default:
+ if (Character.isISOControl(c) && !Character.isWhitespace(c))
+ writer.write('?');
+ else
+ writer.write(c);
+ }
+ }
+ }
+
+ /* ------------------------------------------------------------ */
+ public interface ErrorPageMapper
+ {
+ String getErrorPage(HttpServletRequest request);
+ }
+
+ /* ------------------------------------------------------------ */
+ public static ErrorHandler getErrorHandler(Server server, ContextHandler context)
+ {
+ ErrorHandler error_handler=null;
+ if (context!=null)
+ error_handler=context.getErrorHandler();
+ if (error_handler==null && server!=null)
+ error_handler = server.getBean(ErrorHandler.class);
+ return error_handler;
+ }
+}
projects / gigi.git / blobdiff