Source of file SoundCloud.php

<?php

namespace AudioDidact\SupportedSites;

use AudioDidact\Video;

class SoundCloud extends SupportedSite {

	// Setup global variables

	private $streamsBaseURL = "https://api.soundcloud.com/tracks/XYZ/streams?client_id=";

	private $clientID;

	private $invalidURLMessage = "Invalid SoundCloud URL Entered.<br/>Valid URLs look like https://soundcloud.com/user_name/xxxxxxxxxxxx";

	private $thumbnailURL;

	private $audioJSON;

	/**

	 * SoundCloud constructor. Gets the audio information, checks for it in the user's feed.

	 *

	 * @param string $str

	 * @param boolean $isVideo

	 * @throws \Exception

	 */

	public function __construct($str, $isVideo){

		$this->video = new Video();

		// If there is a URL/ID, continue

		if($str != null){

			if(!filter_var($str, FILTER_VALIDATE_URL) || !mb_strpos($str, "soundcloud")){

				throw new \Exception($this->invalidURLMessage);

			}

			$this->video->setURL($str);

			$this->video->setIsVideo(false);

			// Set video ID and time to current time

			$info = $this->getVideoInfo($str);

			if(!$info){

				throw new \Exception($this->invalidURLMessage);

			}

			$this->video->setId($info["ID"]);

			$this->video->setFilename($this->video->getId());

			$this->video->setThumbnailFilename($this->video->getFilename() . ".jpg");

			$this->video->setTime(time());

			$this->video->setTitle($info["title"]);

			$this->video->setAuthor($info["author"]);

			$this->video->setDesc($info["description"]);

		}

	}

	private function cURLHTTPGet($url, $ssl = false){

		$ch = curl_init($url);

		$headers = [

			"User-Agent: curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8h zlib/1.2.3 libssh2/0.15-CVS",

			"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",

			"Accept-Language: en-us;q=0.5,en;q=0.3",

			"Keep-Alive: 115",

			"Connection: keep-alive"

		];

		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

		curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

		curl_setopt($ch, CURLOPT_TIMEOUT, 30);

		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);

		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

		if($ssl){

			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

			curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);

		}

		$response = curl_exec($ch);

		$responseCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

		if($responseCode != 200 && $responseCode != 302 && $responseCode != 304){

			$response = false;

		}

		return $response;

	}

	private function getVideoInfo($str){

		$str = str_replace("http://", "https://", $str);

		$webpage = $this->cURLHTTPGet($str, true);

		// Find javascript URLs to get a client ID

		preg_match_all("/<script.*src=\"(.*app-.*)\"\s*>/i", $webpage, $jsURLs);

		if(!isset($jsURLs[1][0])){

			return false;

		}

		$jsURL = $jsURLs[1][0];

		// Grab the client ID from te javascript

		$jsFile = file_get_contents($jsURL);

		preg_match_all("/\Wclient_id:\"(.*)\"/iU", $jsFile, $clientIDs);

		$this->clientID = $clientIDs[1][0];

		preg_match("/var\s+c\s*=\s*(\[.*\]),/i", $webpage, $matches);

		$brackets = 0;

		$firstRun = true;

		$strlen = mb_strlen($matches[1]);

		for($i = 0; $i < $strlen; $i++){

			if(!$firstRun && $brackets == 0){

				break;

			}

			if($firstRun){

				$firstRun = false;

			}

			$char = $matches[1][$i];

			if($char == "["){

				$brackets += 1;

			}

			else if($char == "]"){

				$brackets -= 1;

			}

		}

		$json = mb_substr($matches[1], 0, $i);

		$this->audioJSON = json_decode($json, true);

		if(empty($this->audioJSON)){

			return false;

		}

		foreach($this->audioJSON as $a){

			$a = $a["data"][0];

			if(isset($a["title"]) && isset($a["uri"]) && isset($a["description"])){

				$id = explode("/", $a["uri"]);

				$videoId = $id[count($id) - 1];

				$description = $a["description"];

				$title = $a["title"];

				$author = $a["user"]["username"];

				if(isset($a["artwork_url"]) && $a["artwork_url"] != null){

					$this->thumbnailURL = str_replace("large.jpg", "t500x500.jpg", $a["artwork_url"]);

				}

				else{

					$this->thumbnailURL = str_replace("large.jpg", "t500x500.jpg", $a["user"]["avatar_url"]);

				}

				return ["ID" => $videoId, "description" => $description, "title" => $title, "author" => $author];

			}

		}

		error_log("SoundCloud failed to parse JSON for URL: " . $str);

		return false;

	}

	/**

	 * Checks if all thumbnail, video, and mp3 are downloaded and have a length (ie. video or audio are not null)

	 *

	 * @return bool

	 */

	public function allDownloaded(){

		$downloadPath = DOWNLOAD_PATH . DIRECTORY_SEPARATOR;

		$fullDownloadPath = $downloadPath . $this->video->getFilename() . $this->video->getFileExtension();

		// If the thumbnail has not been downloaded, go ahead and download it

		if(!file_exists($downloadPath . $this->video->getThumbnailFilename())){

			$this->downloadThumbnail();

		}

		// If the mp3 check if the mp3 has a duration that is not null

		if(file_exists($fullDownloadPath) && SupportedSite::getDuration($fullDownloadPath)){

			// Before returning true, set the duration since convert will not be run

			$this->video->setDuration(SupportedSite::getDurationSeconds($fullDownloadPath));

			return true;

		}

		// If all else fails, return false

		return false;

	}

	/**

	 * Download thumbnail

	 */

	public function downloadThumbnail(){

		$path = getcwd() . DIRECTORY_SEPARATOR . DOWNLOAD_PATH . DIRECTORY_SEPARATOR;

		$thumbnail = $path . $this->video->getThumbnailFilename();

		file_put_contents($thumbnail, fopen($this->thumbnailURL, "r"));

		// Set the thumbnail file as publicly accessible

		@chmod($thumbnail, 0775);

	}

	private function getDownloadURL(){

		$streamsURL = str_replace("/XYZ/", "/" . $this->video->getId() . "/", $this->streamsBaseURL);

		$streamsJSON = file_get_contents($streamsURL.$this->clientID);

		$streamsJSON = json_decode($streamsJSON, true);

		return $streamsJSON["http_mp3_128_url"];

	}

	public function downloadVideo(){

		$path = getcwd() . DIRECTORY_SEPARATOR . DOWNLOAD_PATH . DIRECTORY_SEPARATOR;

		$videoPath = $path . $this->video->getFilename() . $this->video->getFileExtension();

		$url = $this->getDownloadURL();

		if($this->downloadWithPercentage($url, $videoPath)){

			$this->applyArt();

			// Send progress to UI

			$response = ['stage' => 1, 'progress' => 100];

			echo json_encode($response);

			return true;

		}

		return false;

	}

	/**

	 * Since SoundCloud is audio only, we do not convert, but only add the album artwork

	 */

	public function convert(){

	}

	public static function supportsURL($url){

		return mb_strpos($url, "soundcloud.com") > -1;

	}

}