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-rw-r--r--includes/FeedUtils.php152
1 files changed, 152 insertions, 0 deletions
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+<?php
+
+// TODO: document
+class FeedUtils {
+
+ public static function checkPurge( $timekey, $key ) {
+ global $wgRequest, $wgUser, $messageMemc;
+ $purge = $wgRequest->getVal( 'action' ) === 'purge';
+ if ( $purge && $wgUser->isAllowed('purge') ) {
+ $messageMemc->delete( $timekey );
+ $messageMemc->delete( $key );
+ }
+ }
+
+ public static function checkFeedOutput( $type ) {
+ global $wgFeed, $wgOut, $wgFeedClasses;
+
+ if ( !$wgFeed ) {
+ global $wgOut;
+ $wgOut->addWikiMsg( 'feed-unavailable' );
+ return false;
+ }
+
+ if( !isset( $wgFeedClasses[$type] ) ) {
+ wfHttpError( 500, "Internal Server Error", "Unsupported feed type." );
+ return false;
+ }
+
+ return true;
+ }
+
+ /**
+ * Format a diff for the newsfeed
+ */
+ public static function formatDiff( $row ) {
+ global $wgUser;
+
+ $titleObj = Title::makeTitle( $row->rc_namespace, $row->rc_title );
+ $timestamp = wfTimestamp( TS_MW, $row->rc_timestamp );
+ $actiontext = '';
+ if( $row->rc_type == RC_LOG ) {
+ if( $row->rc_deleted & LogPage::DELETED_ACTION ) {
+ $actiontext = wfMsgHtml('rev-deleted-event');
+ } else {
+ $actiontext = LogPage::actionText( $row->rc_log_type, $row->rc_log_action,
+ $titleObj, $wgUser->getSkin(), LogPage::extractParams($row->rc_params,true,true) );
+ }
+ }
+ return self::formatDiffRow( $titleObj,
+ $row->rc_last_oldid, $row->rc_this_oldid,
+ $timestamp,
+ ($row->rc_deleted & Revision::DELETED_COMMENT) ? wfMsgHtml('rev-deleted-comment') : $row->rc_comment,
+ $actiontext );
+ }
+
+ public static function formatDiffRow( $title, $oldid, $newid, $timestamp, $comment, $actiontext='' ) {
+ global $wgFeedDiffCutoff, $wgContLang, $wgUser;
+ wfProfileIn( __FUNCTION__ );
+
+ $skin = $wgUser->getSkin();
+ # log enties
+ $completeText = '<p>' . implode( ' ',
+ array_filter(
+ array(
+ $actiontext,
+ $skin->formatComment( $comment ) ) ) ) . "</p>\n";
+
+ //NOTE: Check permissions for anonymous users, not current user.
+ // No "privileged" version should end up in the cache.
+ // Most feed readers will not log in anway.
+ $anon = new User();
+ $accErrors = $title->getUserPermissionsErrors( 'read', $anon, true );
+
+ if( $title->getNamespace() >= 0 && !$accErrors ) {
+ if( $oldid ) {
+ wfProfileIn( __FUNCTION__."-dodiff" );
+
+ $de = new DifferenceEngine( $title, $oldid, $newid );
+ #$diffText = $de->getDiff( wfMsg( 'revisionasof',
+ # $wgContLang->timeanddate( $timestamp ) ),
+ # wfMsg( 'currentrev' ) );
+ $diffText = $de->getDiff(
+ wfMsg( 'previousrevision' ), // hack
+ wfMsg( 'revisionasof',
+ $wgContLang->timeanddate( $timestamp ) ) );
+
+
+ if ( strlen( $diffText ) > $wgFeedDiffCutoff ) {
+ // Omit large diffs
+ $diffLink = $title->escapeFullUrl(
+ 'diff=' . $newid .
+ '&oldid=' . $oldid );
+ $diffText = '<a href="' .
+ $diffLink .
+ '">' .
+ htmlspecialchars( wfMsgForContent( 'showdiff' ) ) .
+ '</a>';
+ } elseif ( $diffText === false ) {
+ // Error in diff engine, probably a missing revision
+ $diffText = "<p>Can't load revision $newid</p>";
+ } else {
+ // Diff output fine, clean up any illegal UTF-8
+ $diffText = UtfNormal::cleanUp( $diffText );
+ $diffText = self::applyDiffStyle( $diffText );
+ }
+ wfProfileOut( __FUNCTION__."-dodiff" );
+ } else {
+ $rev = Revision::newFromId( $newid );
+ if( is_null( $rev ) ) {
+ $newtext = '';
+ } else {
+ $newtext = $rev->getText();
+ }
+ $diffText = '<p><b>' . wfMsg( 'newpage' ) . '</b></p>' .
+ '<div>' . nl2br( htmlspecialchars( $newtext ) ) . '</div>';
+ }
+ $completeText .= $diffText;
+ }
+
+ wfProfileOut( __FUNCTION__ );
+ return $completeText;
+ }
+
+ /**
+ * Hacky application of diff styles for the feeds.
+ * Might be 'cleaner' to use DOM or XSLT or something,
+ * but *gack* it's a pain in the ass.
+ *
+ * @param $text String:
+ * @return string
+ * @private
+ */
+ public static function applyDiffStyle( $text ) {
+ $styles = array(
+ 'diff' => 'background-color: white; color:black;',
+ 'diff-otitle' => 'background-color: white; color:black;',
+ 'diff-ntitle' => 'background-color: white; color:black;',
+ 'diff-addedline' => 'background: #cfc; color:black; font-size: smaller;',
+ 'diff-deletedline' => 'background: #ffa; color:black; font-size: smaller;',
+ 'diff-context' => 'background: #eee; color:black; font-size: smaller;',
+ 'diffchange' => 'color: red; font-weight: bold; text-decoration: none;',
+ );
+
+ foreach( $styles as $class => $style ) {
+ $text = preg_replace( "/(<[^>]+)class=(['\"])$class\\2([^>]*>)/",
+ "\\1style=\"$style\"\\3", $text );
+ }
+
+ return $text;
+ }
+
+} \ No newline at end of file