includes/FeedUtils.php

   1 <?php
   2
   3 /**
   4  * Helper functions for feeds
   5  *
   6  * @ingroup Feed
   7  */
   8 class FeedUtils {
   9
  10         /**
  11          * Check whether feed's cache should be cleared; for changes feeds
  12          * If the feed should be purged; $timekey and $key will be removed from
  13          * $messageMemc
  14          *
  15          * @param $timekey String: cache key of the timestamp of the last item
  16          * @param $key String: cache key of feed's content
  17          */
  18         public static function checkPurge( $timekey, $key ) {
  19                 global $wgRequest, $wgUser, $messageMemc;
  20                 $purge = $wgRequest->getVal( 'action' ) === 'purge';
  21                 if ( $purge && $wgUser->isAllowed('purge') ) {
  22                         $messageMemc->delete( $timekey );
  23                         $messageMemc->delete( $key );
  24                 }
  25         }
  26
  27         /**
  28          * Check whether feeds can be used and that $type is a valid feed type
  29          *
  30          * @param $type String: feed type, as requested by the user
  31          * @return Boolean
  32          */
  33         public static function checkFeedOutput( $type ) {
  34                 global $wgFeed, $wgFeedClasses;
  35
  36                 if ( !$wgFeed ) {
  37                         global $wgOut;
  38                         $wgOut->addWikiMsg( 'feed-unavailable' );
  39                         return false;
  40                 }
  41
  42                 if( !isset( $wgFeedClasses[$type] ) ) {
  43                         wfHttpError( 500, "Internal Server Error", "Unsupported feed type." );
  44                         return false;
  45                 }
  46
  47                 return true;
  48         }
  49
  50         /**
  51          * Format a diff for the newsfeed
  52          *
  53          * @param $row Object: row from the recentchanges table
  54          * @return String
  55          */
  56         public static function formatDiff( $row ) {
  57                 global $wgUser;
  58
  59                 $titleObj = Title::makeTitle( $row->rc_namespace, $row->rc_title );
  60                 $timestamp = wfTimestamp( TS_MW, $row->rc_timestamp );
  61                 $actiontext = '';
  62                 if( $row->rc_type == RC_LOG ) {
  63                         if( $row->rc_deleted & LogPage::DELETED_ACTION ) {
  64                                 $actiontext = wfMsgHtml('rev-deleted-event');
  65                         } else {
  66                                 $actiontext = LogPage::actionText( $row->rc_log_type, $row->rc_log_action,
  67                                         $titleObj, $wgUser->getSkin(), LogPage::extractParams($row->rc_params,true,true) );
  68                         }
  69                 }
  70                 return self::formatDiffRow( $titleObj,
  71                         $row->rc_last_oldid, $row->rc_this_oldid,
  72                         $timestamp,
  73                         ($row->rc_deleted & Revision::DELETED_COMMENT) ? wfMsgHtml('rev-deleted-comment') : $row->rc_comment,
  74                         $actiontext );
  75         }
  76
  77         /**
  78          * Really format a diff for the newsfeed
  79          *
  80          * @param $title Title object
  81          * @param $oldid Integer: old revision's id
  82          * @param $newid Integer: new revision's id
  83          * @param $timestamp Integer: new revision's timestamp
  84          * @param $comment String: new revision's comment
  85          * @param $actiontext String: text of the action; in case of log event
  86          * @return String
  87          */
  88         public static function formatDiffRow( $title, $oldid, $newid, $timestamp, $comment, $actiontext='' ) {
  89                 global $wgFeedDiffCutoff, $wgContLang, $wgUser;
  90                 wfProfileIn( __METHOD__ );
  91
  92                 $skin = $wgUser->getSkin();
  93                 # log enties
  94                 $completeText = '<p>' . implode( ' ',
  95                         array_filter(
  96                                 array(
  97                                         $actiontext,
  98                                         $skin->formatComment( $comment ) ) ) ) . "</p>\n";
  99
 100                 //NOTE: Check permissions for anonymous users, not current user.
 101                 //      No "privileged" version should end up in the cache.
 102                 //      Most feed readers will not log in anway.
 103                 $anon = new User();
 104                 $accErrors = $title->getUserPermissionsErrors( 'read', $anon, true );
 105
 106                 if( $title->getNamespace() >= 0 && !$accErrors && $newid ) {
 107                         if( $oldid ) {
 108                                 wfProfileIn( __METHOD__."-dodiff" );
 109
 110                                 #$diffText = $de->getDiff( wfMsg( 'revisionasof',
 111                                 #       $wgContLang->timeanddate( $timestamp ),
 112                                 #       $wgContLang->date( $timestamp ),
 113                                 #       $wgContLang->time( $timestamp ) ),
 114                                 #       wfMsg( 'currentrev' ) );
 115
 116                                 // Don't bother generating the diff if we won't be able to show it
 117                                 if ( $wgFeedDiffCutoff > 0 ) {
 118                                         $de = new DifferenceEngine( $title, $oldid, $newid );
 119                                         $diffText = $de->getDiff(
 120                                                 wfMsg( 'previousrevision' ), // hack
 121                                                 wfMsg( 'revisionasof',
 122                                                         $wgContLang->timeanddate( $timestamp ),
 123                                                         $wgContLang->date( $timestamp ),
 124                                                         $wgContLang->time( $timestamp ) ) );
 125                                 }
 126
 127                                 if ( ( strlen( $diffText ) > $wgFeedDiffCutoff ) || ( $wgFeedDiffCutoff <= 0 ) ) {
 128                                         // Omit large diffs
 129                                         $diffLink = $title->escapeFullUrl(
 130                                                 'diff=' . $newid .
 131                                                 '&oldid=' . $oldid );
 132                                         $diffText = '<a href="' .
 133                                                 $diffLink .
 134                                                 '">' .
 135                                                 htmlspecialchars( wfMsgForContent( 'showdiff' ) ) .
 136                                                 '</a>';
 137                                 } elseif ( $diffText === false ) {
 138                                         // Error in diff engine, probably a missing revision
 139                                         $diffText = "<p>Can't load revision $newid</p>";
 140                                 } else {
 141                                         // Diff output fine, clean up any illegal UTF-8
 142                                         $diffText = UtfNormal::cleanUp( $diffText );
 143                                         $diffText = self::applyDiffStyle( $diffText );
 144                                 }
 145                                 wfProfileOut( __METHOD__."-dodiff" );
 146                         } else {
 147                                 $rev = Revision::newFromId( $newid );
 148                                 if( is_null( $rev ) ) {
 149                                         $newtext = '';
 150                                 } else {
 151                                         $newtext = $rev->getText();
 152                                 }
 153                                 $diffText = '<p><b>' . wfMsg( 'newpage' ) . '</b></p>' .
 154                                         '<div>' . nl2br( htmlspecialchars( $newtext ) ) . '</div>';
 155                         }
 156                         $completeText .= $diffText;
 157                 }
 158
 159                 wfProfileOut( __METHOD__ );
 160                 return $completeText;
 161         }
 162
 163         /**
 164          * Hacky application of diff styles for the feeds.
 165          * Might be 'cleaner' to use DOM or XSLT or something,
 166          * but *gack* it's a pain in the ass.
 167          *
 168          * @param $text String: diff's HTML output
 169          * @return String: modified HTML
 170          * @private
 171          */
 172         public static function applyDiffStyle( $text ) {
 173                 $styles = array(
 174                         'diff'             => 'background-color: white; color:black;',
 175                         'diff-otitle'      => 'background-color: white; color:black;',
 176                         'diff-ntitle'      => 'background-color: white; color:black;',
 177                         'diff-addedline'   => 'background: #cfc; color:black; font-size: smaller;',
 178                         'diff-deletedline' => 'background: #ffa; color:black; font-size: smaller;',
 179                         'diff-context'     => 'background: #eee; color:black; font-size: smaller;',
 180                         'diffchange'       => 'color: red; font-weight: bold; text-decoration: none;',
 181                 );
 182
 183                 foreach( $styles as $class => $style ) {
 184                         $text = preg_replace( "/(<[^>]+)class=(['\"])$class\\2([^>]*>)/",
 185                                 "\\1style=\"$style\"\\3", $text );
 186                 }
 187
 188                 return $text;
 189         }
 190
 191 }