mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/RSS
synced 2024-12-02 19:36:09 +00:00
b3f3afee2b
composer: * mediawiki/mediawiki-codesniffer: 35.0.0 → 36.0.0 * php-parallel-lint/php-parallel-lint: 1.2.0 → 1.3.0 npm: * grunt: 1.3.0 → 1.4.0 * lodash: 4.17.19 → 4.17.21 * https://npmjs.com/advisories/1673 (CVE-2021-23337) Change-Id: Ie2a7289801cab5f79f967abaf0c09c3f9f691de3
685 lines
20 KiB
PHP
685 lines
20 KiB
PHP
<?php
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use MediaWiki\MediaWikiServices;
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class RSSParser {
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protected $maxheads = 32;
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protected $date = "Y-m-d H:i:s";
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protected $ItemMaxLength = 200;
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protected $reversed = false;
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protected $highlight = [];
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protected $filter = [];
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protected $filterOut = [];
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protected $itemTemplate;
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protected $url;
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protected $etag;
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protected $lastModified;
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protected $xml;
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protected $error;
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protected $displayFields = [ 'author', 'title', 'encodedContent', 'description' ];
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protected $stripItems;
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protected $markerString;
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/**
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* @var WANObjectCache
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*/
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private $cache;
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/**
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* @var RSSData
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*/
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public $rss;
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/**
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* @var CurlHttpRequest|PhpHttpRequest
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*/
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public $client;
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/**
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* Convenience function that takes a space-separated string and returns an array of words
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* @param string $str list of words
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* @return array words found
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*/
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private static function explodeOnSpaces( $str ) {
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$found = preg_split( '# +#', $str );
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return is_array( $found ) ? $found : [];
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}
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/**
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* Take a bit of WikiText that looks like
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* <rss max=5>http://example.com/</rss>
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* and return an object that can produce rendered output.
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* @param string $url
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* @param array $args
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*/
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public function __construct( $url, $args ) {
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global $wgRSSDateDefaultFormat,$wgRSSItemMaxLength;
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$this->url = $url;
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$this->markerString = wfRandomString( 32 );
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$this->stripItems = [];
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$this->cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
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# Get max number of headlines from argument-array
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if ( isset( $args['max'] ) ) {
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$this->maxheads = $args['max'];
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}
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# Get reverse flag from argument array
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if ( isset( $args['reverse'] ) ) {
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$this->reversed = true;
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}
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# Get date format from argument array
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# or use a default value
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# @todo FIXME: not used yet
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if ( isset( $args['date'] ) ) {
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$this->date = $args['date'];
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} elseif ( isset( $wgRSSDateDefaultFormat ) ) {
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$this->date = $wgRSSDateDefaultFormat;
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}
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# Get highlight terms from argument array
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if ( isset( $args['highlight'] ) ) {
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# mapping to lowercase here so the regex can be case insensitive below.
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$this->highlight = self::explodeOnSpaces( $args['highlight'] );
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}
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# Get filter terms from argument array
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if ( isset( $args['filter'] ) ) {
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$this->filter = self::explodeOnSpaces( $args['filter'] );
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}
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# Get a maximal length for item texts
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if ( isset( $args['item-max-length'] ) ) {
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$this->ItemMaxLength = $args['item-max-length'];
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} elseif ( is_numeric( $wgRSSItemMaxLength ) ) {
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$this->ItemMaxLength = $wgRSSItemMaxLength;
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}
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if ( isset( $args['filterout'] ) ) {
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$this->filterOut = self::explodeOnSpaces( $args['filterout'] );
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}
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// 'template' is the pagename of a user's itemTemplate including
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// a further pagename for the feedTemplate
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// In that way everything is handled via these two pages
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// and no default pages or templates are used.
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// 'templatename' is an optional pagename of a user's feedTemplate
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// In that way it substitutes $1 (default: RSSPost) in MediaWiki:Rss-item
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if ( isset( $args['template'] ) ) {
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$itemTemplateTitleObject = Title::newFromText( $args['template'], NS_TEMPLATE );
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if ( $itemTemplateTitleObject->exists() ) {
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$itemTemplatePageObject = WikiPage::factory( $itemTemplateTitleObject );
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$itemTemplateContentObject = $itemTemplatePageObject->getContent();
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if ( $itemTemplateContentObject instanceof TextContent ) {
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$this->itemTemplate = $itemTemplateContentObject->getText();
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}
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}
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} else {
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if ( isset( $args['templatename'] ) ) {
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$feedTemplatePagename = $args['templatename'];
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} else {
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// compatibility patch for rss extension
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$feedTemplatePagename = 'RSSPost';
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$feedTemplateTitleObject = Title::newFromText( $feedTemplatePagename, NS_TEMPLATE );
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if ( !$feedTemplateTitleObject->exists() ) {
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$feedTemplatePagename = Title::makeTitleSafe( NS_MEDIAWIKI, 'Rss-feed' );
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}
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}
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// MediaWiki:Rss-item = {{ feedTemplatePagename | title = {{{title}}} | ... }}
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// if the attribute parameter templatename= is not present
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// then it defaults to
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// {{ Template:RSSPost | title = {{{title}}} | ... }}
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// - if Template:RSSPost exists from pre-1.9 versions
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// {{ MediaWiki:Rss-feed | title = {{{title}}} | ... }}
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// - otherwise
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$this->itemTemplate = wfMessage( 'rss-item', $feedTemplatePagename )->plain();
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}
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}
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private function insertStripItem( $item ) {
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$this->stripItems[] = $item;
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$itemIndex = count( $this->stripItems ) - 1;
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return "{$this->markerString}-{$itemIndex}-{$this->markerString}";
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}
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/**
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* Return RSS object for the given URL, maintaining caching.
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*
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* NOTES ON RETRIEVING REMOTE FILES:
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* No attempt will be made to fetch remote files if there is something in cache.
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*
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* NOTES ON FAILED REQUESTS:
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* If there is an HTTP error while fetching an RSS object, the cached version
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* will be returned, if it exists.
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*
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* @return Status object
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*/
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public function fetch() {
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if ( !isset( $this->url ) ) {
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return Status::newFatal( 'rss-fetch-nourl' );
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}
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// Flow
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// 1. check cache
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// 2. if there is a hit, make sure its fresh
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// 3. if cached obj fails freshness check, fetch remote
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// 4. if remote fails, return stale object, or error
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$key = $this->cache->makeKey( 'rss-fetch', $this->url );
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$cachedFeed = $this->loadFromCache( $key );
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if ( $cachedFeed !== false ) {
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wfDebugLog( 'RSS', 'Outputting cached feed for ' . $this->url );
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return Status::newGood();
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}
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wfDebugLog( 'RSS', 'Cache Failed, fetching ' . $this->url . ' from remote.' );
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$status = $this->fetchRemote( $key );
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return $status;
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}
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/**
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* Retrieve the URL from the cache
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* @param string $key lookup key to associate with this item
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* @return bool
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*/
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protected function loadFromCache( $key ) {
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global $wgRSSCacheCompare;
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$data = $this->cache->get( $key );
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if ( !is_array( $data ) ) {
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return false;
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}
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list( $etag, $lastModified, $rss ) = $data;
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if ( !isset( $rss->items ) ) {
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return false;
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}
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wfDebugLog( 'RSS', "Got '$key' from cache" );
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# Now that we've verified that we got useful data, keep it around.
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$this->rss = $rss;
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$this->etag = $etag;
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$this->lastModified = $lastModified;
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// We only care if $wgRSSCacheCompare is > 0
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if ( $wgRSSCacheCompare && time() - $wgRSSCacheCompare > $lastModified ) {
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wfDebugLog( 'RSS', 'Content is old enough that we need to check cached content' );
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return false;
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}
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return true;
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}
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/**
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* Store these objects (i.e. etag, lastModified, and RSS) in the cache.
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* @param string $key lookup key to associate with this item
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* @return bool
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*/
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protected function storeInCache( $key ) {
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global $wgRSSCacheAge;
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if ( !isset( $this->rss ) ) {
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return false;
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}
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$this->cache->set(
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$key,
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[ $this->etag, $this->lastModified, $this->rss ],
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$wgRSSCacheAge
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);
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wfDebugLog( 'RSS', "Stored '$key' as in cache" );
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return true;
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}
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/**
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* Retrieve a feed.
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* @param string $key Cache key
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* @param array $headers headers to send along with the request
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* @return Status object
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*/
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protected function fetchRemote( $key, array $headers = [] ) {
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global $wgRSSFetchTimeout, $wgRSSUserAgent, $wgRSSProxy,
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$wgRSSUrlNumberOfAllowedRedirects;
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if ( $this->etag ) {
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wfDebugLog( 'RSS', 'Used etag: ' . $this->etag );
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$headers['If-None-Match'] = $this->etag;
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}
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if ( $this->lastModified ) {
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$lastModified = gmdate( 'r', $this->lastModified );
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wfDebugLog( 'RSS', "Used last modified: $lastModified" );
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$headers['If-Modified-Since'] = $lastModified;
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}
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/**
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* 'noProxy' can conditionally be set as shown in the commented
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* example below; in HttpRequest 'noProxy' takes precedence over
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* any value of 'proxy' and disables the use of a proxy.
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*
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* This is useful if you run the wiki in an intranet and need to
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* access external feed urls through a proxy but internal feed
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* urls must be accessed without a proxy.
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*
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* The general handling of such cases will be subject of a
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* forthcoming version.
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*/
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$url = $this->url;
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$noProxy = !isset( $wgRSSProxy );
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// Example for disabling proxy use for certain urls
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// $noProxy = preg_match( '!\.internal\.example\.com$!i', parse_url( $url, PHP_URL_HOST ) );
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if ( isset( $wgRSSUrlNumberOfAllowedRedirects )
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&& is_numeric( $wgRSSUrlNumberOfAllowedRedirects ) ) {
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$maxRedirects = $wgRSSUrlNumberOfAllowedRedirects;
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} else {
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$maxRedirects = 0;
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}
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// we set followRedirects intentionally to true to see error messages
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// in cases where the maximum number of redirects is reached
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$client = MediaWikiServices::getInstance()->getHttpRequestFactory()->create( $url,
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[
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'timeout' => $wgRSSFetchTimeout,
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'followRedirects' => true,
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'maxRedirects' => $maxRedirects,
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'proxy' => $wgRSSProxy,
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'noProxy' => $noProxy,
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'userAgent' => $wgRSSUserAgent,
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],
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__METHOD__
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);
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foreach ( $headers as $header => $value ) {
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$client->setHeader( $header, $value );
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}
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$fetch = $client->execute();
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$this->client = $client;
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if ( !$fetch->isGood() ) {
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wfDebug( 'RSS', 'Request Failed: ' . Status::wrap( $fetch )->getWikitext() );
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return $fetch;
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}
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$ret = $this->responseToXML( $key );
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return $ret;
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}
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/**
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* @see https://bugzilla.wikimedia.org/show_bug.cgi?id=34763
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* @param string $wikiText
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* @param Parser $origParser
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* @return string
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*/
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protected function sandboxParse( $wikiText, $origParser ) {
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$myParser = $origParser->getFreshParser();
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$result = $myParser->parse(
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$wikiText,
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$origParser->getTitle(),
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$origParser->getOptions()
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);
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$stripItems = $this->stripItems;
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$text = preg_replace_callback(
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"/{$this->markerString}-(\d+)-{$this->markerString}/",
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static function ( array $matches ) use ( $stripItems ) {
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$markerIndex = (int)$matches[1];
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return $stripItems[$markerIndex];
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},
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$result->getText()
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);
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return $text;
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}
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/**
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* Render the entire feed so that each item is passed to the
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* template which the MediaWiki then displays.
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*
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* @param Parser $parser
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* @param PPFrame $frame The frame param to pass to recursiveTagParse()
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* @return string
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*/
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public function renderFeed( $parser, $frame ) {
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$renderedFeed = '';
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if ( isset( $this->itemTemplate ) && isset( $parser ) && isset( $frame ) ) {
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$headcnt = 0;
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if ( $this->reversed ) {
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$this->rss->items = array_reverse( $this->rss->items );
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}
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foreach ( $this->rss->items as $item ) {
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if ( $this->maxheads > 0 && $headcnt >= $this->maxheads ) {
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continue;
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}
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if ( $this->canDisplay( $item ) ) {
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$renderedFeed .= $this->renderItem( $item, $parser ) . "\n";
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$headcnt++;
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}
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}
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$renderedFeed = $this->sandboxParse( $renderedFeed, $parser );
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}
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$parser->addTrackingCategory( 'rss-tracking-category' );
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return $renderedFeed;
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}
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/**
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* Render each item, filtering it out if necessary, applying any highlighting.
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*
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* @param array $item an array produced by RSSData where keys are the names of the RSS elements
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* @param Parser $parser
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* @return mixed
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*/
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protected function renderItem( $item, $parser ) {
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$renderedItem = $this->itemTemplate;
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// $info will only be an XML element name, so we're safe using it.
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// $item[$info] is handled by the XML parser --
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// and that means bad RSS with stuff like
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// <description><script>alert("hi")</script></description> will find its
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// rogue <script> tags neutered.
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// use the overloaded multi byte wrapper functions in GlobalFunctions.php
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foreach ( array_keys( $item ) as $info ) {
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if ( $item[$info] != "" ) {
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switch ( $info ) {
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// ATOM <id> elements and RSS <link> elements are item link urls
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case 'id':
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$txt = $this->sanitizeUrl( $item['id'] );
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$renderedItem = str_replace( '{{{link}}}', $txt, $renderedItem );
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break;
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case 'link':
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$txt = $this->sanitizeUrl( $item['link'] );
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$renderedItem = str_replace( '{{{link}}}', $txt, $renderedItem );
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break;
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case 'date':
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$tempTimezone = date_default_timezone_get();
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date_default_timezone_set( 'UTC' );
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$txt = date( $this->date,
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strtotime( $this->escapeTemplateParameter( $item['date'] ) ) );
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date_default_timezone_set( $tempTimezone );
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$renderedItem = str_replace( '{{{date}}}', $txt, $renderedItem );
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break;
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default:
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$str = $this->escapeTemplateParameter( $item[$info] );
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$str = $parser->getFunctionLang()->truncateForVisual( $str, $this->ItemMaxLength );
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$str = $this->highlightTerms( $str );
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$renderedItem = str_replace( '{{{' . $info . '}}}',
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$this->insertStripItem( $str ), $renderedItem );
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}
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}
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}
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// nullify all remaining info items in the template
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// without a corresponding info in the current feed item
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$renderedItem = preg_replace( "!{{{[^}]+}}}!U", "", $renderedItem );
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return $renderedItem;
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}
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/**
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* Sanitize a URL for inclusion in wikitext. Escapes characters that have
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* a special meaning in wikitext, replacing them with URL escape codes, so
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* that arbitrary input can be included as a free or bracketed external
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* link and both work and be safe.
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* @param string $url
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* @return string
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*/
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protected function sanitizeUrl( $url ) {
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# Remove control characters
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$url = preg_replace( '/[\000-\037\177]/', '', trim( $url ) );
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# Escape other problematic characters
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$out = '';
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for ( $i = 0, $len = strlen( $url ); $i < $len; $i++ ) {
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$boringLength = strcspn( $url, '<>"[|]\ {', $i );
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if ( $boringLength ) {
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$out .= substr( $url, $i, $boringLength );
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$i += $boringLength;
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}
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if ( $i < $len ) {
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$out .= rawurlencode( $url[$i] );
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}
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}
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return $out;
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}
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/**
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* Sanitize user input for inclusion as a template parameter.
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*
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* Unlike in wfEscapeWikiText() as of r77127, this escapes }} in addition
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* to the other kinds of markup, to avoid user input ending a template
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* invocation.
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*
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* If you want to allow clickable link Urls (HTML <a> tag) in RSS feeds:
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* $wgRSSAllowLinkTag = true;
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*
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* If you want to allow images (HTML <img> tag) in RSS feeds:
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* $wgRSSAllowImageTag = true;
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* @param string $text
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* @return string
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*/
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protected function escapeTemplateParameter( $text ) {
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global $wgRSSAllowLinkTag, $wgRSSAllowImageTag;
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$extraInclude = [];
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$extraExclude = [ "iframe" ];
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if ( isset( $wgRSSAllowLinkTag ) && $wgRSSAllowLinkTag ) {
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$extraInclude[] = "a";
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} else {
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$extraExclude[] = "a";
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}
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if ( isset( $wgRSSAllowImageTag ) && $wgRSSAllowImageTag ) {
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$extraInclude[] = "img";
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} else {
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$extraExclude[] = "img";
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}
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if ( ( isset( $wgRSSAllowLinkTag ) && $wgRSSAllowLinkTag )
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|| ( isset( $wgRSSAllowImageTag ) && $wgRSSAllowImageTag ) ) {
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$ret = Sanitizer::removeHTMLtags( $text, null, [], $extraInclude, $extraExclude );
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} else {
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// use the old escape method for a while
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$text = str_replace(
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[
|
|
'[', '|', ']', '\'', 'ISBN ',
|
|
'RFC ', '://', "\n=", '{{', '}}',
|
|
],
|
|
[
|
|
'[', '|', ']', ''', 'ISBN ',
|
|
'RFC ', '://', "\n=", '{{', '}}',
|
|
],
|
|
htmlspecialchars( str_replace( "\n", "", $text ) )
|
|
);
|
|
|
|
// keep some basic layout tags
|
|
$ret = str_replace(
|
|
[
|
|
'<p>', '</p>',
|
|
'<br/>', '<br>', '</br>',
|
|
'<b>', '</b>',
|
|
'<i>', '</i>',
|
|
'<u>', '</u>',
|
|
'<s>', '</s>',
|
|
],
|
|
[
|
|
"", "<br/>",
|
|
"<br/>", "<br/>", "<br/>",
|
|
"'''", "'''",
|
|
"''", "''",
|
|
"<u>", "</u>",
|
|
"<s>", "</s>",
|
|
],
|
|
$text
|
|
);
|
|
}
|
|
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Parse an HTTP response object into an array of relevant RSS data
|
|
*
|
|
* @param string $key the key to use to store the parsed response in the cache
|
|
* @return Status parsed RSS object (see RSSParse) or false
|
|
*/
|
|
protected function responseToXML( $key ) {
|
|
wfDebugLog( 'RSS', "Got '" . $this->client->getStatus() . "', updating cache for $key" );
|
|
if ( $this->client->getStatus() === 304 ) {
|
|
# Not modified, update cache
|
|
wfDebugLog( 'RSS', "Got 304, updating cache for $key" );
|
|
$this->storeInCache( $key );
|
|
} else {
|
|
$this->xml = new DOMDocument;
|
|
$rawXML = $this->client->getContent();
|
|
|
|
if ( $rawXML == '' ) {
|
|
return Status::newFatal( 'rss-parse-error', 'No XML content' );
|
|
}
|
|
|
|
Wikimedia\suppressWarnings();
|
|
|
|
$oldDisable = false;
|
|
if ( LIBXML_VERSION < 20900 ) {
|
|
// Prevent loading external entities when parsing the XML (bug 46932)
|
|
$oldDisable = libxml_disable_entity_loader( true );
|
|
}
|
|
$this->xml->loadXML( $rawXML );
|
|
if ( LIBXML_VERSION < 20900 ) {
|
|
libxml_disable_entity_loader( $oldDisable );
|
|
}
|
|
|
|
Wikimedia\restoreWarnings();
|
|
|
|
$this->rss = new RSSData( $this->xml );
|
|
|
|
// if RSS parsed successfully
|
|
if ( $this->rss && !$this->rss->error ) {
|
|
$this->etag = $this->client->getResponseHeader( 'Etag' );
|
|
$this->lastModified =
|
|
strtotime( $this->client->getResponseHeader( 'Last-Modified' ) );
|
|
|
|
wfDebugLog( 'RSS', 'Stored etag (' . $this->etag . ') and Last-Modified (' .
|
|
$this->client->getResponseHeader( 'Last-Modified' ) . ') and items (' .
|
|
count( $this->rss->items ) . ')!' );
|
|
$this->storeInCache( $key );
|
|
} else {
|
|
return Status::newFatal( 'rss-parse-error', $this->rss->error );
|
|
}
|
|
}
|
|
return Status::newGood();
|
|
}
|
|
|
|
/**
|
|
* Determine if a given item should or should not be displayed
|
|
*
|
|
* @param array $item associative array that RSSData produced for an <item>
|
|
* @return bool
|
|
*/
|
|
protected function canDisplay( array $item ) {
|
|
$check = '';
|
|
|
|
/* We're only going to check the displayable fields */
|
|
foreach ( $this->displayFields as $field ) {
|
|
if ( isset( $item[$field] ) ) {
|
|
$check .= $item[$field];
|
|
}
|
|
}
|
|
|
|
if ( $this->filter( $check, 'filterOut' ) ) {
|
|
return false;
|
|
}
|
|
if ( $this->filter( $check, 'filter' ) ) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Filters items in or out if the match a string we're looking for.
|
|
*
|
|
* @param string $text the text to examine
|
|
* @param string $filterType "filterOut" to check for matches in the filterOut member list.
|
|
* Otherwise, uses the filter member list.
|
|
* @return bool Decision to filter or not.
|
|
*/
|
|
protected function filter( $text, $filterType ) {
|
|
if ( $filterType === 'filterOut' ) {
|
|
$filter = $this->filterOut;
|
|
} else {
|
|
$filter = $this->filter;
|
|
}
|
|
|
|
if ( count( $filter ) == 0 ) {
|
|
return $filterType !== 'filterOut';
|
|
}
|
|
|
|
/* Using : for delimiter here since it'll be quoted automatically. */
|
|
$match = preg_match( ':(' . implode( '|',
|
|
array_map( 'preg_quote', $filter ) ) . '):i', $text );
|
|
if ( $match ) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Highlight the words we're supposed to be looking for
|
|
*
|
|
* @param string $text the text to look in.
|
|
* @return string with matched text highlighted in a <span> element
|
|
*/
|
|
protected function highlightTerms( $text ) {
|
|
if ( count( $this->highlight ) === 0 ) {
|
|
return $text;
|
|
}
|
|
|
|
$terms = array_flip( array_map( 'strtolower', $this->highlight ) );
|
|
$highlight = ':' . implode( '|',
|
|
array_map( 'preg_quote', array_values( $this->highlight ) ) ) . ':i';
|
|
return preg_replace_callback( $highlight, static function ( $match ) use ( $terms ) {
|
|
$styleStart = "<span style='font-weight: bold; " .
|
|
"background: none repeat scroll 0%% 0%% rgb(%s); color: %s;'>";
|
|
$styleEnd = '</span>';
|
|
|
|
# bg colors cribbed from Google's highlighting of search terms
|
|
$bgcolor = [ '255, 255, 102', '160, 255, 255', '153, 255, 153',
|
|
'255, 153, 153', '255, 102, 255', '136, 0, 0', '0, 170, 0', '136, 104, 0',
|
|
'0, 70, 153', '153, 0, 153' ];
|
|
# Spelling out the fg colors instead of using processing time to create this list
|
|
$color = [ 'black', 'black', 'black', 'black', 'black',
|
|
'white', 'white', 'white', 'white', 'white' ];
|
|
|
|
$index = $terms[strtolower( $match[0] )] % count( $bgcolor );
|
|
|
|
return sprintf( $styleStart, $bgcolor[$index], $color[$index] ) . $match[0] . $styleEnd;
|
|
}, $text );
|
|
}
|
|
}
|