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FeedUtils.php
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FeedUtils.php
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<?php
/**
* Helper functions for feeds.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Feed
*/
namespace MediaWiki\Feed;
use MediaWiki\Content\TextContent;
use MediaWiki\Context\DerivativeContext;
use MediaWiki\Context\RequestContext;
use MediaWiki\Html\Html;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Output\OutputPage;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Revision\SlotRecord;
use MediaWiki\Title\Title;
use UtfNormal;
/**
* Helper functions for feeds
*
* @ingroup Feed
*/
class FeedUtils {
/**
* Check whether feeds can be used and that $type is a valid feed type
*
* @param string $type Feed type, as requested by the user
* @param OutputPage|null $output Null falls back to $wgOut
* @return bool
* @since 1.36 $output parameter added
*
*/
public static function checkFeedOutput( $type, $output = null ) {
$feed = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::Feed );
$feedClasses = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::FeedClasses );
if ( $output === null ) {
// Todo update GoogleNewsSitemap and deprecate
global $wgOut;
$output = $wgOut;
}
if ( !$feed ) {
$output->addWikiMsg( 'feed-unavailable' );
return false;
}
if ( !isset( $feedClasses[$type] ) ) {
$output->addWikiMsg( 'feed-invalid' );
return false;
}
return true;
}
/**
* Format a diff for the newsfeed
*
* @param \stdClass $row Row from the recentchanges table, including fields as
* appropriate for CommentStore
* @param string|null $formattedComment rc_comment in HTML format, or null
* to format it on demand.
* @return string
*/
public static function formatDiff( $row, $formattedComment = null ) {
$titleObj = Title::makeTitle( $row->rc_namespace, $row->rc_title );
$timestamp = wfTimestamp( TS_MW, $row->rc_timestamp );
$actiontext = '';
if ( $row->rc_type == RC_LOG ) {
$rcRow = (array)$row; // newFromRow() only accepts arrays for RC rows
$actiontext = MediaWikiServices::getInstance()->getLogFormatterFactory()
->newFromRow( $rcRow )->getActionText();
}
if ( $row->rc_deleted & RevisionRecord::DELETED_COMMENT ) {
$formattedComment = wfMessage( 'rev-deleted-comment' )->escaped();
} elseif ( $formattedComment === null ) {
$services = MediaWikiServices::getInstance();
$formattedComment = $services->getCommentFormatter()->format(
$services->getCommentStore()->getComment( 'rc_comment', $row )->text );
}
return self::formatDiffRow2( $titleObj,
$row->rc_last_oldid, $row->rc_this_oldid,
$timestamp,
$formattedComment,
$actiontext
);
}
/**
* Really format a diff for the newsfeed
*
* @param Title $title
* @param int $oldid Old revision's id
* @param int $newid New revision's id
* @param string $timestamp New revision's timestamp
* @param string $comment New revision's comment
* @param string $actiontext Text of the action; in case of log event
* @return string
* @deprecated since 1.38 use formatDiffRow2
*
*/
public static function formatDiffRow( $title, $oldid, $newid, $timestamp,
$comment, $actiontext = ''
) {
$formattedComment = MediaWikiServices::getInstance()->getCommentFormatter()
->format( $comment );
return self::formatDiffRow2( $title, $oldid, $newid, $timestamp,
$formattedComment, $actiontext );
}
/**
* Really really format a diff for the newsfeed. Same as formatDiffRow()
* except with preformatted comments.
*
* @param Title $title
* @param int $oldid Old revision's id
* @param int $newid New revision's id
* @param string $timestamp New revision's timestamp
* @param string $formattedComment New revision's comment in HTML format
* @param string $actiontext Text of the action; in case of log event
* @return string
*/
public static function formatDiffRow2(
$title, $oldid, $newid, $timestamp, $formattedComment, $actiontext = ''
) {
$feedDiffCutoff = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::FeedDiffCutoff );
// log entries
$unwrappedText = implode(
' ',
array_filter( [ $actiontext, $formattedComment ] )
);
$completeText = Html::rawElement( 'p', [], $unwrappedText ) . "\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 anyway.
$services = MediaWikiServices::getInstance();
$anon = $services->getUserFactory()->newAnonymous();
$permManager = $services->getPermissionManager();
$userCan = $permManager->userCan(
'read',
$anon,
$title
);
// Can't diff special pages, unreadable pages or pages with no new revision
// to compare against: just return the text.
if ( $title->getNamespace() < 0 || !$userCan || !$newid ) {
return $completeText;
}
$revLookup = $services->getRevisionLookup();
$contentHandlerFactory = $services->getContentHandlerFactory();
if ( $oldid ) {
$diffText = '';
// Don't bother generating the diff if we won't be able to show it
if ( $feedDiffCutoff > 0 ) {
$revRecord = $revLookup->getRevisionById( $oldid );
if ( !$revRecord ) {
$diffText = false;
} else {
$context = new DerivativeContext( RequestContext::getMain() );
$context->setTitle( $title );
$model = $revRecord->getSlot(
SlotRecord::MAIN,
RevisionRecord::RAW
)->getModel();
$contentHandler = $contentHandlerFactory->getContentHandler( $model );
$de = $contentHandler->createDifferenceEngine( $context, $oldid, $newid );
$lang = $context->getLanguage();
$user = $context->getUser();
$diffText = $de->getDiff(
$context->msg( 'previousrevision' )->text(), // hack
$context->msg( 'revisionasof',
$lang->userTimeAndDate( $timestamp, $user ),
$lang->userDate( $timestamp, $user ),
$lang->userTime( $timestamp, $user ) )->text() );
}
}
if ( $feedDiffCutoff <= 0 || ( strlen( $diffText ) > $feedDiffCutoff ) ) {
// Omit large diffs
$diffText = self::getDiffLink( $title, $newid, $oldid );
} elseif ( $diffText === false ) {
// Error in diff engine, probably a missing revision
$diffText = Html::rawElement(
'p',
[],
"Can't load revision $newid"
);
} else {
// Diff output fine, clean up any illegal UTF-8
$diffText = UtfNormal\Validator::cleanUp( $diffText );
$diffText = self::applyDiffStyle( $diffText );
}
} else {
$revRecord = $revLookup->getRevisionById( $newid );
if ( $feedDiffCutoff <= 0 || $revRecord === null ) {
$newContent = $contentHandlerFactory
->getContentHandler( $title->getContentModel() )
->makeEmptyContent();
} else {
$newContent = $revRecord->getContent( SlotRecord::MAIN );
}
if ( $newContent instanceof TextContent ) {
// only textual content has a "source view".
$text = $newContent->getText();
if ( $feedDiffCutoff <= 0 || strlen( $text ) > $feedDiffCutoff ) {
$html = null;
} else {
$html = nl2br( htmlspecialchars( $text ) );
}
} else {
// XXX: we could get an HTML representation of the content via getParserOutput, but that may
// contain JS magic and generally may not be suitable for inclusion in a feed.
// Perhaps Content should have a getDescriptiveHtml method and/or a getSourceText method.
// Compare also ApiFeedContributions::feedItemDesc
$html = null;
}
if ( $html === null ) {
// Omit large new page diffs, T31110
// Also use diff link for non-textual content
$diffText = self::getDiffLink( $title, $newid );
} else {
$diffText = Html::rawElement(
'p',
[],
Html::rawElement( 'b', [], wfMessage( 'newpage' )->text() )
);
$diffText .= Html::rawElement( 'div', [], $html );
}
}
$completeText .= $diffText;
return $completeText;
}
/**
* Generates a diff link. Used when the full diff is not wanted for example
* when $wgFeedDiffCutoff is 0.
*
* @param Title $title Title object: used to generate the diff URL
* @param int $newid Newid for this diff
* @param int|null $oldid Oldid for the diff. Null means it is a new article
* @return string
*/
protected static function getDiffLink( Title $title, $newid, $oldid = null ) {
$queryParameters = [ 'diff' => $newid ];
if ( $oldid != null ) {
$queryParameters['oldid'] = $oldid;
}
$diffUrl = $title->getFullURL( $queryParameters );
$diffLink = Html::element( 'a', [ 'href' => $diffUrl ],
wfMessage( 'showdiff' )->inContentLanguage()->text() );
return $diffLink;
}
/**
* 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 string $text Diff's HTML output
* @return string Modified HTML
*/
public static function applyDiffStyle( $text ) {
$styles = [
'diff' => 'background-color: #fff; color: #202122;',
'diff-otitle' => 'background-color: #fff; color: #202122; text-align: center;',
'diff-ntitle' => 'background-color: #fff; color: #202122; text-align: center;',
'diff-addedline' => 'color: #202122; font-size: 88%; border-style: solid; '
. 'border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; '
. 'vertical-align: top; white-space: pre-wrap;',
'diff-deletedline' => 'color: #202122; font-size: 88%; border-style: solid; '
. 'border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; '
. 'vertical-align: top; white-space: pre-wrap;',
'diff-context' => 'background-color: #f8f9fa; color: #202122; font-size: 88%; '
. 'border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; '
. 'border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;',
'diffchange' => 'font-weight: bold; text-decoration: none;',
];
foreach ( $styles as $class => $style ) {
$text = preg_replace( '/(<\w+\b[^<>]*)\bclass=([\'"])(?:[^\'"]*\s)?' .
preg_quote( $class ) . '(?:\s[^\'"]*)?\2(?=[^<>]*>)/',
'$1style="' . $style . '"', $text );
}
return $text;
}
}
/** @deprecated class alias since 1.40 */
class_alias( FeedUtils::class, 'FeedUtils' );

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