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<?php
namespace YouTube;
// YouTube is capitalized twice because that's how youtube itself does it:
// https://developers.google.com/youtube/v3/code_samples/php
class YouTubeDownloader
{
protected $client;
/** @var string|null */
protected $error;
function __construct()
{
$this->client = new Browser();
}
public function getBrowser()
{
return $this->client;
}
public function getLastError()
{
return $this->error;
}
/**
* Look for a player script URL. E.g:
* <script src="//s.ytimg.com/yts/jsbin/player-fr_FR-vflHVjlC5/base.js" name="player/base"></script>
*
* @param $video_html
* @return null|string
*/
public function getPlayerScriptUrl($video_html)
{
$player_url = null;
// check what player version that video is using
if (preg_match('@<script\s*src="([^"]+player[^"]+js)@', $video_html, $matches)) {
$player_url = $matches[1];
// relative protocol?
if (strpos($player_url, '//') === 0) {
$player_url = 'http://' . substr($player_url, 2);
} elseif (strpos($player_url, '/') === 0) {
// relative path?
$player_url = 'http://www.youtube.com' . $player_url;
}
}
return $player_url;
}
public function getPlayerCode($player_url)
{
$contents = $this->client->getCached($player_url);
return $contents;
}
// extract youtube video_id from any piece of text
public function extractVideoId($str)
{
if (preg_match('/[a-z0-9_-]{11}/i', $str, $matches)) {
return $matches[0];
}
return false;
}
/**
* @param array $links
* @param string $selector mp4, 360, etc...
* @return array
*/
private function selectFirst($links, $selector)
{
$result = array();
$formats = preg_split('/\s*,\s*/', $selector);
// has to be in this order
foreach ($formats as $f) {
foreach ($links as $l) {
if (stripos($l['format'], $f) !== false || $f == 'any') {
$result[] = $l;
}
}
}
return $result;
}
public function getVideoInfo($url)
{
// $this->client->get("https://www.youtube.com/get_video_info?el=embedded&eurl=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D" . urlencode($video_id) . "&video_id={$video_id}");
}
public function getPageHtml($url)
{
$video_id = $this->extractVideoId($url);
return $this->client->get("https://www.youtube.com/watch?v={$video_id}");
}
public function getPlayerResponse($page_html)
{
if (preg_match('/player_response":"(.*?)","/', $page_html, $matches)) {
$match = stripslashes($matches[1]);
$ret = json_decode($match, true);
return $ret;
}
return null;
}
public function parsePlayerResponse($player_response, $js_code)
{
$parser = new Parser();
try {
$formats = array();
if (isset($player_response['streamingData']) && isset($player_response['streamingData']['formats'])) {
$formats = $player_response['streamingData']['formats'];
}
$adaptiveFormats = array();
if (isset($player_response['streamingData']) && isset($player_response['streamingData']['adaptiveFormats'])) {
$adaptiveFormats = $player_response['streamingData']['adaptiveFormats'];
}
if (!is_array($formats)) {
$formats = array();
}
if (!is_array($adaptiveFormats)) {
$adaptiveFormats = array();
}
$formats_combined = array_merge($formats, $adaptiveFormats);
// final response
$return = array();
foreach ($formats_combined as $item) {
$cipher = '';
if (isset($item['cipher']) || isset($item['signatureCipher'])) {
$cipher = isset($item['cipher']) ? $item['cipher'] : $item['signatureCipher'];
}
$itag = $item['itag'];
// some videos do not need to be decrypted!
if (isset($item['url'])) {
$return[] = array(
'url' => $item['url'],
'itag' => $itag,
'format' => $parser->parseItagInfo($itag)
);
continue;
}
parse_str($cipher, $result);
$url = $result['url'];
$sp = $result['sp']; // typically 'sig'
$signature = $result['s'];
$decoded_signature = (new SignatureDecoder())->decode($signature, $js_code);
// redirector.googlevideo.com
$return[] = array(
'url' => $url . '&' . $sp . '=' . $decoded_signature,
'itag' => $itag,
'format' => $parser->parseItagInfo($itag)
);
}
return $return;
} catch (\Exception $exception) {
// do nothing
} catch (\Throwable $throwable) {
// do nothing
}
return null;
}
public function getDownloadLinks($video_id, $selector = false)
{
$this->error = null;
$page_html = $this->getPageHtml($video_id);
if (strpos($page_html, 'We have been receiving a large volume of requests') !== false ||
strpos($page_html, 'systems have detected unusual traffic') !== false) {
$this->error = 'HTTP 429: Too many requests.';
return array();
}
// get JSON encoded parameters that appear on video pages
$json = $this->getPlayerResponse($page_html);
// get player.js location that holds signature function
$url = $this->getPlayerScriptUrl($page_html);
$js = $this->getPlayerCode($url);
$result = $this->parsePlayerResponse($json, $js);
// if error happens
if (!is_array($result)) {
return array();
}
// do we want all links or just select few?
if ($selector) {
return $this->selectFirst($result, $selector);
}
return $result;
}
}