Youtube WatchLater to Playlist Script

ytwll2m3u.php

<?php

/**
 * Youtube Watch Later List To Playlist Script
 * 
 * This script fetches your watch later list and outputs it as an M3U playlist
 *
 * Requirements:
 *   PHP enabled webserver
 *   Google PHP API (https://github.com/google/google-api-php-client)
 *   A YouTube API key (Oauth2, can be registered at https://console.developers.google.com/)
 *   Some kittens to sacrifice
 *
 * Initialization
 *   First ensure your webserver can write a file called "key.php" to the directory
 *   you put this file in. E.g. "touch key.php ; chmod ugo+w key.php"
 *   Next open the appropriate URL in your browser. You will be asked to pair
 *   this script with your YouTube-Account. If you configured everything correctly
 *   it will output the playlist and save your access codes in the key.php mentioned
 *   above. Successive requests do not require additional authentication. You may now
 *   put the URL in your YT-enabled media player like VLC.
 *
 * Based on examples by DomSammut (https://www.domsammut.com/code/php-server-side-youtube-v3-oauth-api-video-upload-guide)
 * 2015 Florian Knodt <yt@adlerweb.info>
 */ 

// Set this to the directory of google api php client
set_include_path('./google-api-php-client/src/');

$OAUTH2_CLIENT_ID = 'YOURID.apps.googleusercontent.com';
$OAUTH2_CLIENT_SECRET = 'YOURSECRET';
$REDIRECT = 'http://localhost/yt/ytwll2m3u.php';
$APPNAME = 'YouTube WLL Import Test';

require_once 'Google/autoload.php';
session_start();

$client = new Google_Client();
$client->setClientId($OAUTH2_CLIENT_ID);
$client->setClientSecret($OAUTH2_CLIENT_SECRET);
$client->setApplicationName($APPNAME);
$client->setAccessType('offline');

if(file_exists('key.php')) {
    require_once 'key.php';
}

if(isset($key)) {
    $client->setAccessToken($key);
    $_SESSION['token'] = $key;
}else{
    $client->setScopes('https://www.googleapis.com/auth/youtube');
    $client->setRedirectUri($REDIRECT);
}

// Define an object that will be used to make all API requests.
$youtube = new Google_Service_YouTube($client);

if (isset($_GET['code'])) {
    if (strval($_SESSION['state']) !== strval($_GET['state'])) {
        die('The session state did not match.');
    }
 
    $client->authenticate($_GET['code']);
    $_SESSION['token'] = $client->getAccessToken();
 
}
 
if (isset($_SESSION['token'])) {
    $client->setAccessToken($_SESSION['token']);
    $keydata = '<?php $key=\''.$_SESSION['token'].'\'; ?>';
    //echo '<code>' . $_SESSION['token'] . '</code>';
   
    if(!is_writable('key.php')) {
        die('key.php can not be written - please put this code into key.php: '.$keydata);
    }
    file_put_contents('key.php', $keydata);
}

// Check to ensure that the access token was successfully acquired.
if ($client->getAccessToken()) {
    try {
        // Call the channels.list method to retrieve information about the
        // currently authenticated user's channel.
        $channelsResponse = $youtube->channels->listChannels('contentDetails', array(
            'mine' => 'true',
        ));
 
        $playlist = '#EXTM3U'."\n";
        foreach ($channelsResponse['items'] as $channel) {
            // Extract the unique playlist ID that identifies the list of videos
            // uploaded to the channel, and then call the playlistItems.list method
            // to retrieve that list.
            $uploadsListId = $channel['contentDetails']['relatedPlaylists']['watchLater'];
 
            $playlistItemsResponse = $youtube->playlistItems->listPlaylistItems('snippet', array(
                'playlistId' => $uploadsListId,
                'maxResults' => 50
            ));
 
            foreach ($playlistItemsResponse['items'] as $playlistItem) {
                $playlist .= '#EXTINF:-1,'.$playlistItem['snippet']['title']."\n".'https://www.youtube.com/watch?v='.$playlistItem['snippet']['resourceId']['videoId']."\n";
            }
            
            while(isset($playlistItemsResponse['nextPageToken'])) {
                $playlistItemsResponse = $youtube->playlistItems->listPlaylistItems('snippet', array(
                    'playlistId' => $uploadsListId,
                    'maxResults' => 50,
                    'nextPageToken' => $playlistItemsResponse['nextPageToken'],
                ));
                foreach ($playlistItemsResponse['items'] as $playlistItem) {
                    //$htmlBody .= sprintf('<li>%s (%s)</li>', $playlistItem['snippet']['title'],
                    //$playlistItem['snippet']['resourceId']['videoId']);
                    $playlist .= '#EXTINF:-1,'.$playlistItem['snippet']['title']."\n".'https://www.youtube.com/watch?v='.$playlistItem['snippet']['resourceId']['videoId']."\n";
                }
            }
        }
    } catch (Google_ServiceException $e) {
        echo sprintf('<p>A service error occurred: <code>%s</code></p>',
            htmlspecialchars($e->getMessage()));
    } catch (Google_Exception $e) {
        echo sprintf('<p>An client error occurred: <code>%s</code></p>',
            htmlspecialchars($e->getMessage()));
    }
 
    $_SESSION['token'] = $client->getAccessToken();
} else {
    $state = mt_rand();
    $client->setState($state);
    $_SESSION['state'] = $state;
 
    $authUrl = $client->createAuthUrl();
    $htmlBody = <<<END
  <h3>Authorization Required</h3>
  <p>You need to <a href="$authUrl">authorise access</a> before proceeding.<p>
END;
}

if(isset($playlist)) die($playlist);
?>
 
<!doctype html>
<html>
<head>
    <title>My Uploads</title>
</head>
<body>
<?php echo $htmlBody?>
</body>
</html>