mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/RSS
synced 2024-09-24 18:59:27 +00:00
437 lines
12 KiB
PHP
437 lines
12 KiB
PHP
<?php
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class RSSParser {
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protected $charset;
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protected $maxheads = 32;
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protected $reversed = false;
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protected $highlight = array();
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protected $filter = array();
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protected $filterOut = array();
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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 = array( 'author', 'title', 'encodedContent', 'description' );
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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 $str String: 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 : array();
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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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*/
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function __construct( $url, $args ) {
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$this->url = $url;
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# Get charset from argument array
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# FIXME: not used yet
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if ( isset( $args['charset'] ) ) {
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$this->charset = $args['charset'];
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} else {
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global $wgOutputEncoding;
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$this->charset = $wgOutputEncoding;
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}
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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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# FIXME: not used yet
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if ( isset( $args['date'] ) ) {
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$this->date = $args['date'];
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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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if ( isset( $args['filterout'] ) ) {
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$this->filterOut = self::explodeOnSpaces( $args['filterout'] );
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}
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if ( isset( $args['template'] ) ) {
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$titleObject = Title::newFromText( $args['template'], NS_TEMPLATE );
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$article = new Article( $titleObject, 0 );
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$this->itemTemplate = $article->fetchContent();
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} else {
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$this->itemTemplate = wfMsgNoTrans( 'rss-item' );
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}
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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 (and if $wgRSSCacheFreshOnly is false)
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*
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* @return boolean Status object
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*/
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function fetch() {
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global $wgRSSCacheAge, $wgRSSCacheFreshOnly;
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global $wgRSSCacheDirectory, $wgRSSFetchTimeout;
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global $wgRSSOutputEncoding, $wgRSSInputEncoding;
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global $wgRSSDetectEncoding;
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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 = wfMemcKey( $this->url );
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$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 $key String: lookup key to associate with this item
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* @return boolean
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*/
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protected function loadFromCache( $key ) {
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global $wgMemc, $wgRSSCacheCompare;
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$data = $wgMemc->get( $key );
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if ( $data === false ) {
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return false;
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}
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list( $etag, $lastModified, $rss ) =
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$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 this objects (e.g. etag, lastModified, and RSS) in the cache.
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* @param $key String: lookup key to associate with this item
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* @return boolean
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*/
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protected function storeInCache( $key ) {
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global $wgMemc, $wgRSSCacheAge;
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if ( !isset( $this->rss ) ) {
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return false;
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}
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$r = $wgMemc->set( $key,
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array( $this->etag, $this->lastModified, $this->rss ),
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$wgRSSCacheAge );
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wfDebugLog( 'RSS', "Stored '$key' as in cache? $r");
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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 $key String:
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* @param $headers Array: 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 = array()) {
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global $wgRSSFetchTimeout, $wgRSSUserAgent;
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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 ( $this->lastModified ) {
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$lm = gmdate( 'r', $this->lastModified );
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wfDebugLog( 'RSS', "Used last modified: $lm" );
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$headers['If-Modified-Since'] = $lm;
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}
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$client =
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HttpRequest::factory( $this->url, array( 'timeout' => $wgRSSFetchTimeout ) );
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$client->setUserAgent( $wgRSSUserAgent );
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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: ' . $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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* 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 the parser param to pass to recursiveTagParse()
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* @param $frame the frame param to pass to recursiveTagParse()
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*/
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function renderFeed( $parser, $frame ) {
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$output = '';
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if ( isset( $this->itemTemplate ) ) {
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$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( $item ) ) {
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$output .= $this->renderItem( $item, $parser, $frame );
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$headcnt++;
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}
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}
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}
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return $output;
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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 $item Array: an array produced by RSSData where keys are the
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* names of the RSS elements
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* @param $parser the parser param to pass to recursiveTagParse()
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* @param $frame the frame param to pass to recursiveTagParse()
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*/
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protected function renderItem( $item, $parser, $frame ) {
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$parts = explode( '|', $this->itemTemplate );
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$output = '';
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if ( count( $parts ) > 1 && isset( $parser ) && isset( $frame ) ) {
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$rendered = array();
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foreach ( $this->displayFields as $field ) {
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if ( isset($item[$field] ) ) {
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$item[$field] = $this->highlightTerms( wfEscapeWikiText( $item[$field] ) );
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}
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}
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foreach ( $parts as $part ) {
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$bits = explode( '=', $part );
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$left = null;
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if ( count( $bits ) == 2 ) {
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$left = trim( $bits[0] );
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}
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if ( isset( $item[$left] ) ) {
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$leftValue = str_replace( '{{{' . $left . '}}}', $item[$left], $bits[1] );
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$rendered[] = "$left = $leftValue";
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} else {
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$rendered[] = $part;
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}
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}
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$output .= $parser->recursiveTagParse( implode( ' | ', $rendered ), $frame );
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}
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return $output;
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}
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/**
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* Parse an HTTP response object into an array of relevant RSS data
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*
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* @param $key String: the key to use to store the parsed response in the cache
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* @return parsed RSS object (see RSSParse) or false
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*/
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protected function responseToXML( $key ) {
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wfDebugLog( 'RSS', "Got '" . $this->client->getStatus() . "', updating cache for $key" );
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if ( $this->client->getStatus() === 304 ) {
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# Not modified, update cache
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wfDebugLog( 'RSS', "Got 304, updating cache for $key" );
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$this->storeInCache( $key );
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} else {
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$this->xml = new DOMDocument;
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$raw_xml = $this->client->getContent();
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if( $raw_xml == '' ) {
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return Status::newFatal( 'rss-parse-error', 'No XML content' );
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}
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wfSuppressWarnings();
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$this->xml->loadXML( $raw_xml );
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wfRestoreWarnings();
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$this->rss = new RSSData( $this->xml );
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// if RSS parsed successfully
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if ( $this->rss && !$this->rss->ERROR ) {
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$this->etag = $this->client->getResponseHeader( 'Etag' );
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$this->lastModified =
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strtotime( $this->client->getResponseHeader( 'Last-Modified' ) );
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wfDebugLog( 'RSS', 'Stored etag (' . $this->etag . ') and Last-Modified (' .
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$this->client->getResponseHeader( 'Last-Modified' ) . ') and items (' .
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count( $this->rss->items ) . ')!' );
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$this->storeInCache( $key );
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} else {
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return Status::newFatal( 'rss-parse-error', $this->rss->ERROR );
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}
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}
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return Status::newGood();
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}
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/**
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* Determine if a given item should or should not be displayed
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*
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* @param $item Array: associative array that RSSData produced for an <item>
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* @return boolean
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*/
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protected function canDisplay( array $item ) {
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$check = '';
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/* We're only going to check the displayable fields */
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foreach ( $this->displayFields as $field ) {
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if ( isset( $item[$field] ) ) {
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$check .= $item[$field];
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}
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}
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if ( $this->filter( $check, 'filterOut' ) ) {
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return false;
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}
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if ( $this->filter( $check, 'filter' ) ) {
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return true;
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}
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return false;
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}
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/**
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* Filters items in or out if the match a string we're looking for.
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*
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* @param $text String: the text to examine
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* @param $filterType String: "filterOut" to check for matches in the
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* filterOut member list.
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* Otherwise, uses the filter member list.
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* @return Boolean: decision to filter or not.
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*/
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protected function filter( $text, $filterType ) {
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if ( $filterType === 'filterOut' ) {
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$filter = $this->filterOut;
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} else {
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$filter = $this->filter;
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}
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if ( count( $filter ) == 0 ) {
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return $filterType !== 'filterOut';
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}
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/* Using : for delimiter here since it'll be quoted automatically. */
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$match = preg_match( ':(' . implode( '|', array_map( 'preg_quote', $filter ) ) . '):i', $text ) ;
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if ( $match ) {
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return true;
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}
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return false;
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}
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/**
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* Highlight the words we're supposed to be looking for
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*
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* @param $text String: the text to look in.
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* @return String with matched text highlighted in a <span> element
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*/
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protected function highlightTerms( $text ) {
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if ( count( $this->highlight ) === 0 ) {
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return $text;
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}
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RSSHighlighter::setTerms( $this->highlight );
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$highlight = ':'. implode( '|', array_map( 'preg_quote', array_values( $this->highlight ) ) ) . ':i';
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return preg_replace_callback( $highlight, 'RSSHighlighter::highlightThis', $text );
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}
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}
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class RSSHighlighter {
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static $terms = array();
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/**
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* Set the list of terms to match for the next highlighting session
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* @param $terms Array: list of words to match.
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*/
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static function setTerms( array $terms ) {
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self::$terms = array_flip( array_map( 'strtolower', $terms ) );
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}
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/**
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* Actually replace the supplied list of words with HTML code to highlight the words.
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* @param $match Array: list of matched words to highlight.
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* The words are assigned colors based upon the order
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* they were supplied in setTerms()
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* @return String word wrapped in HTML code.
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*/
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static function highlightThis( $match ) {
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$styleStart = "<span style='font-weight: bold; background: none repeat scroll 0%% 0%% rgb(%s); color: %s;'>";
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$styleEnd = '</span>';
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# bg colors cribbed from Google's highlighting of search teerms
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$bgcolor = array( '255, 255, 102', '160, 255, 255', '153, 255, 153',
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'255, 153, 153', '255, 102, 255', '136, 0, 0', '0, 170, 0', '136, 104, 0',
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'0, 70, 153', '153, 0, 153' );
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# Spelling out the fg colors instead of using processing time to create this list
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$color = array( 'black', 'black', 'black', 'black', 'black',
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'white', 'white', 'white', 'white', 'white' );
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$index = self::$terms[strtolower( $match[0] )] % count( $bgcolor );
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return sprintf( $styleStart, $bgcolor[$index], $color[$index] ) . $match[0] . $styleEnd;
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}
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}
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