[YoutubeBridge] Several fixes and switch maintainer (#2115)

- Fix incorrectly working method for querying video info
- Partially fix playlist mode.
At least it works, if playlist has more than 15 videos. But maximum 100 video items are parsed from playlist.

Reason of switching maintainer: #2113 (comment)

bridges/YoutubeBridge.php

@@ -12,7 +12,7 @@ class YoutubeBridge extends BridgeAbstract {
 	const URI = 'https://www.youtube.com/';
 	const CACHE_TIMEOUT = 10800; // 3h
 	const DESCRIPTION = 'Returns the 10 newest videos by username/channel/playlist or search';
-	const MAINTAINER = 'mitsukarenai';
+	const MAINTAINER = 'em92';
 
 	const PARAMETERS = array(
 		'By username' => array(
@@ -68,29 +68,35 @@ private function ytBridgeQueryVideoInfo($vid, &$author, &$desc, &$time){
 		$html = $this->ytGetSimpleHTMLDOM(self::URI . "watch?v=$vid", true);
 
 		// Skip unavailable videos
-		if(!strpos($html->innertext, 'IS_UNAVAILABLE_PAGE')) {
+		if(strpos($html->innertext, 'IS_UNAVAILABLE_PAGE') !== false) {
 			return;
 		}
 
-		foreach($html->find('script') as $script) {
-			$data = trim($script->innertext);
-
-			if(strpos($data, '{') !== 0)
-				continue; // Wrong script
+		$elAuthor = $html->find('span[itemprop=author] > link[itemprop=name]', 0);
+		if (!is_null($elAuthor)) {
+			$author = $elAuthor->getAttribute('content');
+		}
 
-			$json = json_decode($data);
+		$elDatePublished = $html->find('meta[itemprop=datePublished]', 0);
+		if(!is_null($elDatePublished))
+			$time = strtotime($elDatePublished->getAttribute('content'));
 
-			if(!isset($json->itemListElement))
-				continue; // Wrong script
+		$scriptRegex = '/var ytInitialData = (.*);<\/script>/';
+		preg_match($scriptRegex, $html, $matches) or returnServerError('Could not find ytInitialData');
+		$jsonData = json_decode($matches[1]);
+		$jsonData = $jsonData->contents->twoColumnWatchNextResults->results->results->contents;
 
-			$author = $json->itemListElement[0]->item->name;
+		$videoSecondaryInfo = null;
+		foreach($jsonData as $item) {
+			if (isset($item->videoSecondaryInfoRenderer)) {
+				$videoSecondaryInfo = $item->videoSecondaryInfoRenderer;
+				break;
+			}
 		}
-
-		if(!is_null($html->find('#watch-description-text', 0)))
-			$desc = $html->find('#watch-description-text', 0)->innertext;
-
-		if(!is_null($html->find('meta[itemprop=datePublished]', 0)))
-			$time = strtotime($html->find('meta[itemprop=datePublished]', 0)->getAttribute('content'));
+		if (!$videoSecondaryInfo) {
+			returnServerError('Could not find videoSecondaryInfoRenderer');
+		}
+		$desc = nl2br($videoSecondaryInfo->description->runs[0]->text);
 	}
 
 	private function ytBridgeAddItem($vid, $title, $author, $desc, $time){
@@ -241,16 +247,28 @@ public function collectData(){
 				returnServerError("Could not request YouTube. Tried:\n - $url_feed\n - $url_listing");
 			}
 		} elseif($this->getInput('p')) { /* playlist mode */
+			// TODO: this mode makes a lot of excess video query requests.
+			// To make less requests, we need to cache following dictionary "videoId -> datePublished, duration"
+			// This cache will be used to find out, which videos to fetch
+			// to make feed of 15 items or more, if there a lot of videos published on that date.
 			$this->request = $this->getInput('p');
 			$url_feed = self::URI . 'feeds/videos.xml?playlist_id=' . urlencode($this->request);
 			$url_listing = self::URI . 'playlist?list=' . urlencode($this->request);
 			$html = $this->ytGetSimpleHTMLDOM($url_listing)
 				or returnServerError("Could not request YouTube. Tried:\n - $url_listing");
-			$item_count = $this->ytBridgeParseHtmlListing($html, 'tr.pl-video', '.pl-video-title a', false);
+			$scriptRegex = '/var ytInitialData = (.*);<\/script>/';
+			preg_match($scriptRegex, $html, $matches) or returnServerError('Could not find ytInitialData');
+			// TODO: this method returns only first 100 video items
+			// if it has more videos, playlistVideoListRenderer will have continuationItemRenderer as last element
+			$jsonData = json_decode($matches[1]);
+			$jsonData = $jsonData->contents->twoColumnBrowseResultsRenderer->tabs[0];
+			$jsonData = $jsonData->tabRenderer->content->sectionListRenderer->contents[0]->itemSectionRenderer;
+			$jsonData = $jsonData->contents[0]->playlistVideoListRenderer->contents;
+			$item_count = count($jsonData);
 			if ($item_count <= 15 && !$this->skipFeeds() && ($xml = $this->ytGetSimpleHTMLDOM($url_feed))) {
 				$this->ytBridgeParseXmlFeed($xml);
 			} else {
-				$this->ytBridgeParseHtmlListing($html, 'tr.pl-video', '.pl-video-title a');
+				$this->parseJsonPlaylist($jsonData);
 			}
 			$this->feedName = 'Playlist: ' . str_replace(' - YouTube', '', $html->find('title', 0)->plaintext); // feedName will be used by getName()
 			usort($this->items, function ($item1, $item2) {
@@ -284,16 +302,56 @@ private function skipFeeds() {
 		return ($this->getInput('duration_min') || $this->getInput('duration_max'));
 	}
 
+	public function getURI()
+	{
+		if (!is_null($this->getInput('p'))) {
+			return static::URI . 'playlist?list=' . $this->getInput('p');
+		}
+
+		return parent::getURI();
+	}
+
 	public function getName(){
 	  // Name depends on queriedContext:
 		switch($this->queriedContext) {
 		case 'By username':
 		case 'By channel id':
 		case 'By playlist Id':
 		case 'Search result':
-			return $this->feedName . ' - YouTube'; // We already know it's a bridge, right?
+			return htmlspecialchars_decode($this->feedName) . ' - YouTube'; // We already know it's a bridge, right?
 		default:
 			return parent::getName();
 		}
 	}
+
+	private function parseJsonPlaylist($jsonData) {
+		$duration_min = $this->getInput('duration_min') ?: -1;
+		$duration_min = $duration_min * 60;
+
+		$duration_max = $this->getInput('duration_max') ?: INF;
+		$duration_max = $duration_max * 60;
+
+		if($duration_max < $duration_min) {
+			returnClientError('Max duration must be greater than min duration!');
+		}
+
+		foreach($jsonData as $item) {
+			if (!isset($item->playlistVideoRenderer)) {
+				continue;
+			}
+			$vid = $item->playlistVideoRenderer->videoId;
+			$title = $item->playlistVideoRenderer->title->runs[0]->text;
+
+			$author = '';
+			$desc = '';
+			$time = 0;
+			$duration = intval($item->playlistVideoRenderer->lengthSeconds);
+			if($duration < $duration_min || $duration > $duration_max) {
+				continue;
+			}
+
+			$this->ytBridgeQueryVideoInfo($vid, $author, $desc, $time);
+			$this->ytBridgeAddItem($vid, $title, $author, $desc, $time);
+		}
+	}
 }