src/main/java/net/pterodactylus/sone/web/page/PageToadlet.java

   1 /*
   2  * shortener - PageToadlet.java - Copyright © 2010 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.web.page;
  19
  20 import java.io.IOException;
  21 import java.net.URI;
  22 import java.util.Map.Entry;
  23
  24 import freenet.client.HighLevelSimpleClient;
  25 import freenet.clients.http.LinkEnabledCallback;
  26 import freenet.clients.http.Toadlet;
  27 import freenet.clients.http.ToadletContext;
  28 import freenet.clients.http.ToadletContextClosedException;
  29 import freenet.support.MultiValueTable;
  30 import freenet.support.api.Bucket;
  31 import freenet.support.api.HTTPRequest;
  32 import freenet.support.io.BucketTools;
  33 import freenet.support.io.Closer;
  34
  35 /**
  36  * {@link Toadlet} implementation that is wrapped around a {@link Page}.
  37  *
  38  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  39  */
  40 public class PageToadlet extends Toadlet implements LinkEnabledCallback {
  41
  42         /** The name of the menu item. */
  43         private final String menuName;
  44
  45         /** The page that handles processing. */
  46         private final Page page;
  47
  48         /** The path prefix for the page. */
  49         private final String pathPrefix;
  50
  51         /**
  52          * Creates a new toadlet that hands off processing to a {@link Page}.
  53          *
  54          * @param highLevelSimpleClient
  55          * @param menuName
  56          *            The name of the menu item
  57          * @param page
  58          *            The page to handle processing
  59          * @param pathPrefix
  60          *            Prefix that is prepended to all {@link Page#getPath()} return
  61          *            values
  62          */
  63         protected PageToadlet(HighLevelSimpleClient highLevelSimpleClient, String menuName, Page page, String pathPrefix) {
  64                 super(highLevelSimpleClient);
  65                 this.menuName = menuName;
  66                 this.page = page;
  67                 this.pathPrefix = pathPrefix;
  68         }
  69
  70         /**
  71          * Returns the name to display in the menu.
  72          *
  73          * @return The name in the menu
  74          */
  75         public String getMenuName() {
  76                 return menuName;
  77         }
  78
  79         /**
  80          * {@inheritDoc}
  81          */
  82         @Override
  83         public String path() {
  84                 return pathPrefix + page.getPath();
  85         }
  86
  87         /**
  88          * Handles a HTTP GET request.
  89          *
  90          * @param uri
  91          *            The URI of the request
  92          * @param httpRequest
  93          *            The HTTP request
  94          * @param toadletContext
  95          *            The toadlet context
  96          * @throws IOException
  97          *             if an I/O error occurs
  98          * @throws ToadletContextClosedException
  99          *             if the toadlet context is closed
 100          */
 101         public void handleMethodGET(URI uri, HTTPRequest httpRequest, ToadletContext toadletContext) throws IOException, ToadletContextClosedException {
 102                 handleRequest(new Page.Request(uri, "GET", httpRequest, toadletContext));
 103         }
 104
 105         /**
 106          * Handles a HTTP POST request.
 107          *
 108          * @param uri
 109          *            The URI of the request
 110          * @param httpRequest
 111          *            The HTTP request
 112          * @param toadletContext
 113          *            The toadlet context
 114          * @throws IOException
 115          *             if an I/O error occurs
 116          * @throws ToadletContextClosedException
 117          *             if the toadlet context is closed
 118          */
 119         public void handleMethodPOST(URI uri, HTTPRequest httpRequest, ToadletContext toadletContext) throws IOException, ToadletContextClosedException {
 120                 handleRequest(new Page.Request(uri, "POST", httpRequest, toadletContext));
 121         }
 122
 123         /**
 124          * {@inheritDoc}
 125          */
 126         @Override
 127         public String toString() {
 128                 return getClass().getName() + "[path=" + path() + ",page=" + page + "]";
 129         }
 130
 131         /**
 132          * Handles a HTTP request.
 133          *
 134          * @param pageRequest
 135          *            The request to handle
 136          * @throws IOException
 137          *             if an I/O error occurs
 138          * @throws ToadletContextClosedException
 139          *             if the toadlet context is closed
 140          */
 141         private void handleRequest(Page.Request pageRequest) throws IOException, ToadletContextClosedException {
 142                 Bucket data = null;
 143                 try {
 144                         Page.Response pageResponse = page.handleRequest(pageRequest);
 145                         MultiValueTable<String, String> headers = new MultiValueTable<String, String>();
 146                         if (pageResponse.getHeaders() != null) {
 147                                 for (Entry<String, String> headerEntry : pageResponse.getHeaders().entrySet()) {
 148                                         headers.put(headerEntry.getKey(), headerEntry.getValue());
 149                                 }
 150                         }
 151                         data = pageRequest.getToadletContext().getBucketFactory().makeBucket(-1);
 152                         if (pageResponse.getContent() != null) {
 153                                 try {
 154                                         BucketTools.copyFrom(data, pageResponse.getContent(), -1);
 155                                 } finally {
 156                                         Closer.close(pageResponse.getContent());
 157                                 }
 158                         } else {
 159                                 /* get an OutputStream and close it immediately. */
 160                                 Closer.close(data.getOutputStream());
 161                         }
 162                         writeReply(pageRequest.getToadletContext(), pageResponse.getStatusCode(), pageResponse.getContentType(), pageResponse.getStatusText(), headers, data);
 163                 } catch (Throwable t1) {
 164                         writeInternalError(t1, pageRequest.getToadletContext());
 165                 } finally {
 166                         Closer.close(data);
 167                 }
 168         }
 169
 170         /**
 171          * {@inheritDoc}
 172          */
 173         @Override
 174         public boolean isEnabled(ToadletContext toadletContext) {
 175                 return true;
 176         }
 177
 178 }