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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\RSS; |
| 4 | |
| 5 | use MediaWiki\Hook\ParserFirstCallInitHook; |
| 6 | use MediaWiki\Parser\Parser; |
| 7 | use MediaWiki\Parser\PPFrame; |
| 8 | use MediaWiki\Status\Status; |
| 9 | use MWHttpRequest; |
| 10 | |
| 11 | class Hooks implements ParserFirstCallInitHook { |
| 12 | |
| 13 | /** |
| 14 | * Tell the parser how to handle <rss> elements |
| 15 | * @param Parser $parser Parser Object |
| 16 | */ |
| 17 | public function onParserFirstCallInit( $parser ) { |
| 18 | // Install parser hook for <rss> tags |
| 19 | $parser->setHook( 'rss', [ __CLASS__, 'renderRss' ] ); |
| 20 | } |
| 21 | |
| 22 | /** |
| 23 | * Static function wrapping RSSParser to handle rendering of RSS elements |
| 24 | * @param string $input text inside the tags. |
| 25 | * @param array $args value associative list of the element attributes and |
| 26 | * their values. |
| 27 | * @param Parser $parser |
| 28 | * @param PPFrame $frame parser context |
| 29 | * @return string |
| 30 | */ |
| 31 | public static function renderRss( $input, array $args, Parser $parser, PPFrame $frame ) { |
| 32 | global $wgRSSCacheAge, $wgRSSCacheCompare, $wgRSSNamespaces, |
| 33 | $wgRSSUrlWhitelist, $wgRSSAllowedFeeds; |
| 34 | |
| 35 | if ( is_array( $wgRSSNamespaces ) && count( $wgRSSNamespaces ) ) { |
| 36 | $nsUsed = $parser->getTitle()->getNamespace(); |
| 37 | $authorizedNamespace = array_flip( $wgRSSNamespaces ); |
| 38 | |
| 39 | if ( !isset( $authorizedNamespace[$nsUsed] ) ) { |
| 40 | return Utils::getErrorHtml( 'rss-ns-permission' ); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | if ( isset( $wgRSSAllowedFeeds ) ) { |
| 45 | return Utils::getErrorHtml( 'rss-deprecated-wgrssallowedfeeds-found' ); |
| 46 | } |
| 47 | |
| 48 | # disallow because there is no whitelist at all or an empty whitelist |
| 49 | |
| 50 | if ( !isset( $wgRSSUrlWhitelist ) |
| 51 | || !is_array( $wgRSSUrlWhitelist ) |
| 52 | || ( count( $wgRSSUrlWhitelist ) === 0 ) |
| 53 | ) { |
| 54 | return Utils::getErrorHtml( 'rss-empty-allow-list', |
| 55 | $input |
| 56 | ); |
| 57 | } |
| 58 | |
| 59 | # disallow the feed url because the url is not allowed; or |
| 60 | # disallow because the wildcard joker is not present to allow any feed url |
| 61 | # which can be dangerous |
| 62 | |
| 63 | if ( !( in_array( $input, $wgRSSUrlWhitelist ) ) |
| 64 | && !( in_array( "*", $wgRSSUrlWhitelist ) ) ) { |
| 65 | $listOfAllowed = $parser->getTargetLanguage()->listToText( $wgRSSUrlWhitelist ); |
| 66 | $numberAllowed = $parser->getTargetLanguage()->formatNum( count( $wgRSSUrlWhitelist ) ); |
| 67 | |
| 68 | return Utils::getErrorHtml( 'rss-url-is-not-allowed', |
| 69 | [ $input, $listOfAllowed, $numberAllowed ] |
| 70 | ); |
| 71 | |
| 72 | } |
| 73 | |
| 74 | if ( !MWHttpRequest::isValidURI( $input ) ) { |
| 75 | return Utils::getErrorHtml( 'rss-invalid-url', htmlspecialchars( $input ) ); |
| 76 | } |
| 77 | |
| 78 | if ( $wgRSSCacheCompare ) { |
| 79 | $timeout = $wgRSSCacheCompare; |
| 80 | } else { |
| 81 | $timeout = $wgRSSCacheAge; |
| 82 | } |
| 83 | |
| 84 | $parser->getOutput()->updateCacheExpiry( $timeout ); |
| 85 | |
| 86 | $rss = new RSSParser( $input, $args ); |
| 87 | |
| 88 | $status = $rss->fetch(); |
| 89 | |
| 90 | # Check for errors. |
| 91 | if ( !$status->isGood() ) { |
| 92 | return wfMessage( |
| 93 | 'rss-error', htmlspecialchars( $input ), Status::wrap( $status )->getWikitext() |
| 94 | )->escaped(); |
| 95 | } |
| 96 | |
| 97 | if ( !is_object( $rss->rss ) || !is_array( $rss->rss->items ) ) { |
| 98 | return Utils::getErrorHtml( 'rss-empty', htmlspecialchars( $input ) ); |
| 99 | } |
| 100 | |
| 101 | return $rss->renderFeed( $parser, $frame ); |
| 102 | } |
| 103 | |
| 104 | } |