includes/Feed.php

   1 <?php
   2 # $Id$
   3 # Basic support for outputting syndication feeds in RSS, other formats
   4 #
   5 # Copyright (C) 2004 Brion Vibber <brion@pobox.com>
   6 # http://www.mediawiki.org/
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License along
  19 # with this program; if not, write to the Free Software Foundation, Inc.,
  20 # 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21 # http://www.gnu.org/copyleft/gpl.html
  22
  23 /**
  24  * Contain a feed class as well as classes to build rss / atom ... feeds
  25  * @package MediaWiki
  26  */
  27
  28 /**
  29  * Available feeds objects
  30  */
  31 $wgFeedClasses = array(
  32         'rss' => 'RSSFeed',
  33         'atom' => 'AtomFeed',
  34         );
  35
  36 /**
  37  * @todo document
  38  * @package MediaWiki
  39  */
  40 class FeedItem {
  41         /**#@+
  42          * @var string
  43          * @access private
  44          */
  45         var $Title = 'Wiki';
  46         var $Description = '';
  47         var $Url = '';
  48         var $Date = '';
  49         var $Author = '';
  50         /**#@-*/
  51
  52         /**
  53          * @todo document
  54          */
  55         function FeedItem( $Title, $Description, $Url, $Date = '', $Author = '', $Comments = '' ) {
  56                 $this->Title = $Title;
  57                 $this->Description = $Description;
  58                 $this->Url = $Url;
  59                 $this->Date = $Date;
  60                 $this->Author = $Author;
  61                 $this->Comments = $Comments;
  62         }
  63
  64         /**
  65          * @static
  66          * @todo document
  67          */
  68         function xmlEncode( $string ) {
  69                 global $wgInputEncoding, $wgLang;
  70                 $string = str_replace( "\r\n", "\n", $string );
  71                 if( strcasecmp( $wgInputEncoding, 'utf-8' ) != 0 ) {
  72                         $string = $wgLang->iconv( $wgInputEncoding, 'utf-8', $string );
  73                 }
  74                 return htmlspecialchars( $string );
  75         }
  76
  77         /**
  78          * @todo document
  79          */
  80         function getTitle() { return $this->xmlEncode( $this->Title ); }
  81         /**
  82          * @todo document
  83          */
  84         function getUrl() { return $this->xmlEncode( $this->Url ); }
  85         /**
  86          * @todo document
  87          */
  88         function getDescription() { return $this->xmlEncode( $this->Description ); }
  89         /**
  90          * @todo document
  91          */
  92         function getLanguage() {
  93                 global $wgLanguageCode;
  94                 return $wgLanguageCode;
  95         }
  96         /**
  97          * @todo document
  98          */
  99         function getDate() { return $this->Date; }
 100         /**
 101          * @todo document
 102          */
 103         function getAuthor() { return $this->xmlEncode( $this->Author ); }
 104         /**
 105          * @todo document
 106          */
 107         function getComments() { return $this->xmlEncode( $this->Comments ); }
 108 }
 109
 110 /**
 111  * @todo document
 112  * @package MediaWiki
 113  */
 114 class ChannelFeed extends FeedItem {
 115         /**#@+
 116          * Abstract function, override!
 117          * @abstract
 118          */
 119
 120         /**
 121          * Generate Header of the feed
 122          */
 123         function outHeader() {
 124                 # print "<feed>";
 125         }
 126
 127         /**
 128          * Generate an item
 129          * @param $item
 130          */
 131         function outItem( $item ) {
 132                 # print "<item>...</item>";
 133         }
 134
 135         /**
 136          * Generate Footer of the feed
 137          */
 138         function outFooter() {
 139                 # print "</feed>";
 140         }
 141         /**#@-*/
 142
 143         /**
 144          * @todo document
 145          * @param string $mimetype (optional) type of output
 146          */
 147         function outXmlHeader( $mimetype='application/xml' ) {
 148                 global $wgServer, $wgStylePath, $wgOut;
 149
 150                 # We take over from $wgOut, excepting its cache header info
 151                 $wgOut->disable();
 152                 header( "Content-type: $mimetype; charset=UTF-8" );
 153                 $wgOut->sendCacheControl();
 154
 155                 print '<' . '?xml version="1.0" encoding="utf-8"?' . ">\n";
 156                 print '<' . '?xml-stylesheet type="text/css" href="' .
 157                         htmlspecialchars( "$wgServer$wgStylePath/feed.css" ) . '"?' . ">\n";
 158         }
 159 }
 160
 161 /**
 162  * Generate a RSS feed
 163  * @todo document
 164  * @package MediaWiki
 165  */
 166 class RSSFeed extends ChannelFeed {
 167
 168         /**
 169          * Format a date given a timestamp
 170          * @param integer $ts Timestamp
 171          * @return string Date string
 172          */
 173         function formatTime( $ts ) {
 174                 return gmdate( 'D, d M Y H:i:s \G\M\T', wfTimestamp( TS_UNIX, $ts ) );
 175         }
 176
 177         /**
 178          * Ouput an RSS 2.0 header
 179          */
 180         function outHeader() {
 181                 global $wgVersion;
 182
 183                 $this->outXmlHeader();
 184                 ?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/">
 185         <channel>
 186                 <title><?php print $this->getTitle() ?></title>
 187                 <link><?php print $this->getUrl() ?></link>
 188                 <description><?php print $this->getDescription() ?></description>
 189                 <language><?php print $this->getLanguage() ?></language>
 190                 <generator>MediaWiki <?php print $wgVersion ?></generator>
 191                 <lastBuildDate><?php print $this->formatTime( wfTimestampNow() ) ?></lastBuildDate>
 192 <?php
 193         }
 194
 195         /**
 196          * Output an RSS 2.0 item
 197          * @param FeedItem item to be output
 198          */
 199         function outItem( $item ) {
 200         ?>
 201                 <item>
 202                         <title><?php print $item->getTitle() ?></title>
 203                         <link><?php print $item->getUrl() ?></link>
 204                         <description><?php print $item->getDescription() ?></description>
 205                         <?php if( $item->getDate() ) { ?><pubDate><?php print $this->formatTime( $item->getDate() ) ?></pubDate><?php } ?>
 206                         <?php if( $item->getAuthor() ) { ?><dc:creator><?php print $item->getAuthor() ?></dc:creator><?php }?>
 207                         <?php if( $item->getComments() ) { ?><comments><?php print $item->getComments() ?></comments><?php }?>
 208                 </item>
 209 <?php
 210         }
 211
 212         /**
 213          * Ouput an RSS 2.0 footer
 214          */
 215         function outFooter() {
 216         ?>
 217         </channel>
 218 </rss><?php
 219         }
 220 }
 221
 222 /**
 223  * Generate an Atom feed
 224  * @todo document
 225  * @package MediaWiki
 226  */
 227 class AtomFeed extends ChannelFeed {
 228         /**
 229          * @todo document
 230          */
 231         function formatTime( $ts ) {
 232                 // need to use RFC 822 time format at least for rss2.0
 233                 return gmdate( 'Y-m-d\TH:i:s', wfTimestamp( TS_UNIX, $ts ) );
 234         }
 235
 236         /**
 237          * @todo document
 238          */
 239         function outHeader() {
 240                 global $wgVersion, $wgOut;
 241
 242                 $this->outXmlHeader();
 243                 ?><feed version="0.3" xml:lang="<?php print $this->getLanguage() ?>">
 244                 <title><?php print $this->getTitle() ?></title>
 245                 <link rel="alternate" type="text/html" href="<?php print $this->getUrl() ?>"/>
 246                 <modified><?php print $this->formatTime( wfTimestampNow() ) ?>Z</modified>
 247                 <tagline><?php print $this->getDescription() ?></tagline>
 248                 <generator>MediaWiki <?php print $wgVersion ?></generator>
 249
 250 <?php
 251         }
 252
 253         /**
 254          * @todo document
 255          */
 256         function outItem( $item ) {
 257                 global $wgMimeType;
 258         ?>
 259         <entry>
 260                 <title><?php print $item->getTitle() ?></title>
 261                 <link rel="alternate" type="<?php print $wgMimeType ?>" href="<?php print $item->getUrl() ?>"/>
 262                 <?php if( $item->getDate() ) { ?>
 263                 <modified><?php print $this->formatTime( $item->getDate() ) ?>Z</modified>
 264                 <issued><?php print $this->formatTime( $item->getDate() ) ?></issued>
 265                 <created><?php print $this->formatTime( $item->getDate() ) ?>Z</created><?php } ?>
 266
 267                 <summary type="text/plain"><?php print $item->getDescription() ?></summary>
 268                 <?php if( $item->getAuthor() ) { ?><author><name><?php print $item->getAuthor() ?></name><!-- <url></url><email></email> --></author><?php }?>
 269                 <comment>foobar</comment>
 270         </entry>
 271
 272 <?php /* FIXME need to add comments
 273         <?php if( $item->getComments() ) { ?><dc:comment><?php print $item->getComments() ?></dc:comment><?php }?>
 274       */
 275         }
 276
 277         /**
 278          * @todo document
 279          */
 280         function outFooter() {?>
 281         </feed><?php
 282         }
 283 }
 284
 285 ?>