rss-bridge/bridges/YoutubeBridge.php

<?php
/**
* RssBridgeYoutube 
* Returns the newest videos
*
* @name Youtube Bridge
* @homepage https://www.youtube.com/
* @description Returns the 10 newest videos by username/channel/playlist or search
* @maintainer mitsukarenai
* @update 2014-06-20
* @use1(u="username")
* @use2(c="channel id")
* @use3(p="playlist id")
* @use4(s="search keyword",pa="page")
* 
* WARNING: to parse big playlists (over ~90 videos), you need to edit simple_html_dom.php: 
* change: define('MAX_FILE_SIZE', 600000);
* into:   define('MAX_FILE_SIZE', 900000);  (or more)
*/
class YoutubeBridge extends BridgeAbstract{
    
	private $request;
    
	public function collectData(array $param){

		function getPublishDate($id) {
			// relies on Youtube API; deprecated
			$json = json_decode(file_get_contents("https://gdata.youtube.com/feeds/api/videos/$id?v=2&alt=json"), TRUE);
			$timestamp = strtotime($json['entry']['published']['$t']);
			return $timestamp;
		} 


        	$html = '';
		$limit = 10;
		$count = 0;

		if (isset($param['u'])) {   /* user timeline mode */
			$this->request = $param['u'];
			$html = file_get_html('https://www.youtube.com/user/'.urlencode($this->request).'/videos') or $this->returnError('Could not request Youtube.', 404);

			foreach($html->find('li.channels-content-item') as $element) {
				if($count < $limit) {
					$item = new \Item();
						$videoquery = parse_url($element->find('a',0)->href, PHP_URL_QUERY); parse_str($videoquery, $videoquery);
					$item->id = $videoquery['v'];
					$item->uri = 'https://www.youtube.com/watch?v='.$item->id;
					$item->thumbnailUri = 'https:'.$element->find('img',0)->src;
					$item->title = trim($element->find('h3',0)->plaintext);
					$item->timestamp = getPublishDate($item->id);
					$item->content = '<a href="' . $item->uri . '"><img src="' . $item->thumbnailUri . '" /></a><br><a href="' . $item->uri . '">' . $item->title . '</a>';
					$this->items[] = $item;
					$count++;
				}
			}
		}

		else if (isset($param['c'])) {   /* channel timeline mode */
			$this->request = $param['c'];
			$html = file_get_html('https://www.youtube.com/channel/'.urlencode($this->request).'/videos') or $this->returnError('Could not request Youtube.', 404);

			foreach($html->find('li.channels-content-item') as $element) {
				if($count < $limit) {
					$item = new \Item();
						$videoquery = parse_url($element->find('a',0)->href, PHP_URL_QUERY); parse_str($videoquery, $videoquery);
					$item->id = $videoquery['v'];
					$item->uri = 'https://www.youtube.com/watch?v='.$item->id;
					$item->thumbnailUri = 'https:'.$element->find('img',0)->src;
					$item->title = trim($element->find('h3',0)->plaintext);
					$item->timestamp = getPublishDate($item->id);
					$item->content = '<a href="' . $item->uri . '"><img src="' . $item->thumbnailUri . '" /></a><br><a href="' . $item->uri . '">' . $item->title . '</a>';
					$this->items[] = $item;
					$count++;
				}
			}
		}

		else if (isset($param['p'])) {   /* playlist mode */
			$this->request = $param['p'];
			$html = file_get_html('https://www.youtube.com/playlist?list='.urlencode($this->request).'') or $this->returnError('Could not request Youtube.', 404);

			foreach($html->find('tr.pl-video') as $element) {
				if($count < $limit) {
					$item = new \Item();
					$item->uri = 'https://www.youtube.com'.$element->find('.pl-video-title a',0)->href;
					$item->thumbnailUri = 'https:'.str_replace('/default.','/mqdefault.',$element->find('.pl-video-thumbnail img',0)->src);
					$item->title = trim($element->find('.pl-video-title a',0)->plaintext);
					$item->id = str_replace('/watch?v=', '', $element->find('a',0)->href);
					$item->timestamp = getPublishDate($item->id);
					$item->content = '<a href="' . $item->uri . '"><img src="' . $item->thumbnailUri . '" /></a><br><a href="' . $item->uri . '">' . $item->title . '</a>';
					$this->items[] = $item;
					$count++;
				}
				$this->request = 'Playlist '.trim(str_replace(' - YouTube', '', $html->find('title', 0)->plaintext)).', by '.$html->find('h1', 0)->plaintext;
			}
		}

			else if (isset($param['s'])) {   /* search mode */
				$this->request = $param['s']; $page = 1; if (isset($param['pa'])) $page = (int)preg_replace("/[^0-9]/",'', $param['pa']); 
				$html = file_get_html('https://www.youtube.com/results?search_query='.urlencode($this->request).'&&page='.$page.'&filters=video&search_sort=video_date_uploaded') or $this->returnError('Could not request Youtube.', 404);

				foreach($html->find('li.yt-lockup') as $element) {
					$item = new \Item();
					$item->uri = 'https://www.youtube.com'.$element->find('a',0)->href;
					$checkthumb = $element->find('img', 0)->getAttribute('data-thumb');
					if($checkthumb !== FALSE)
						$item->thumbnailUri = $checkthumb;
					else
						$item->thumbnailUri = ''.$element->find('img',0)->src;
					$item->title = trim($element->find('h3',0)->plaintext);
					$item->id = str_replace('/watch?v=', '', $element->find('a',0)->href);
					//$item->timestamp = getPublishDate($item->id);  /* better not use it here */
					$item->content = '<a href="' . $item->uri . '"><img src="' . $item->thumbnailUri . '" /></a><br><a href="' . $item->uri . '">' . $item->title . '</a>';
					$this->items[] = $item;
				}
				$this->request = 'Search: '.str_replace(' - YouTube', '', $html->find('title', 0)->plaintext);
			}
			else
				$this->returnError('You must either specify a Youtube username (?u=...) or a channel id (?c=...) or a playlist id (?p=...) or search (?s=...)', 400);
		}

	public function getName(){
		return (!empty($this->request) ? $this->request .' - ' : '') .'Youtube Bridge';
	}

	public function getURI(){
		return 'https://www.youtube.com/';
	}

	public function getCacheDuration(){
		return 10800; // 3 hours
	}
}