youtube v3 change banner channel example not working

client_secret.json

// Place your google client_secret.json file here

composer.json

{
    "name": "Example",
    "require": {
        "fkooman/guzzle-bearer-auth-plugin": "dev-master",
        "fkooman/php-oauth-client": "dev-master"
    }
}

index.php

<?php
ini_set('display_errors',1);
error_reporting(-1);
session_start();
use \fkooman\OAuth\Client;

require 'vendor/autoload.php';
require 'youtube.handler.php';


$youtube = new YoutubeHandler();


if( !isset($_GET['action']) )
{
	echo '<link href="css/bootstrap.css" rel="stylesheet"/>';
	echo '<form method="get" name="form">'.
	'<input type="hidden" name="action" value="upload">'.
	'<button type="submit">Upload</button>'.
	'</form>';
}
elseif( $_GET['action']=='upload' || $_GET['action']=='oauth_callback' )
{
	if( $youtube->isAuthenticated()===false )
	{
		$authenticated = $youtube->authenticate();
	}


	if( $youtube->isAuthenticated() || $authenticated )	
	{
		$youtube->uploadBanner( '18H.jpg' );
	}

}

youtube.php

<?php

use \fkooman\OAuth\Client\GoogleClientConfig 	as OauthGoogleClientConfig;
use \fkooman\OAuth\Client\Api 					as OauthApi;
use \fkooman\OAuth\Client\SessionStorage 		as OauthSessionStorage;
use \fkooman\OAuth\Client\Context 				as OauthContext;
use \fkooman\OAuth\Client\Callback 				as OauthCallback;
use \fkooman\OAuth\Client\AuthorizeException	as OauthAuthorizeException;
use fkooman\Guzzle\Plugin\BearerAuth\BearerAuth	as OauthGuzzleBearer;
use \Guzzle\Http\Client as GuzzleClient;
use \Guzzle\Http\Exception\ClientErrorResponseException	as ClientErrorResponseException;


class YoutubeHandler{
	protected $api_uri;

	public function __construct()
	{
		$this->client  = null;
		$this->api_uri = 'https://www.googleapis.com/youtube/v3/';
		$this->clientConfig = new OauthGoogleClientConfig(
			json_decode(file_get_contents("client_secret.json"), true)
		);

		$this->oauth_api     = new OauthApi("foo", $this->clientConfig, new OauthSessionStorage(), new GuzzleClient());
		$this->oauth_context = new OauthContext( 'mycontext', array('https://www.googleapis.com/auth/youtube') );
		$this->accessToken   = $this->oauth_api->getAccessToken( $this->oauth_context );

		if( $this->accessToken===false )
		{
		}
		else
		{
			// OK!!!
		}
	}


	public function isAuthenticated()
	{
		return $this->accessToken!==false;
	}


	public function authenticate( $callback_url=null )
	{
		if( !isset($_GET['action']) || $_GET['action']!='oauth_callback' )
		{
			header( 'Location: ' . $this->oauth_api->getAuthorizeUri( $this->oauth_context ) );
			exit();
		}
		else
		{
			// Come from Google... 
			try
			{
				$this->oauth_callback = new OauthCallback('foo', $this->clientConfig, new OauthSessionStorage(), new GuzzleClient() );
				$this->oauth_callback->handleCallback($_GET);
				return true;
				//header("HTTP/1.1 302 Found");
			    //header("Location: http://localhost:8888/digraf/youtube/index.php");
			    //exit;
			}
			catch( OauthAuthorizeException $e )
			{
				// this exception is thrown by Callback when the OAuth server returns a
				// specific error message for the client, e.g.: the user did not authorize
				// the request
				die(sprintf("ERROR: %s, DESCRIPTION: %s", $e->getMessage(), $e->getDescription()));
			}
			catch( \Exception $e )
			{
				// other error, these should never occur in the normal flow
				die(sprintf("ERROR: %s", $e->getMessage()));
			}
		}
	}




	public function call( $method, $resource, $headers=null, $body=null )
	{
		try
		{
			if( $this->client===null )
			{
				$this->client = new GuzzleClient();
				$bearerAuth   = new OauthGuzzleBearer( $this->accessToken->getAccessToken() );
				$this->client->addSubscriber($bearerAuth);
			}

			$request  = $this->client->createRequest( $method, $resource, $headers, $body );
			$response = $request->send();
		}
		catch( \fkooman\Guzzle\Plugin\BearerAuth\Exception\BearerErrorResponseException $e )
		{
			if ("invalid_token" === $e->getBearerReason())
		    {
		        // the token we used was invalid, possibly revoked, we throw it away
		        $oauth_api->deleteAccessToken($context);
		        $oauth_api->deleteRefreshToken($context);
		        /* no valid access token available, go to authorization server */
		        header("HTTP/1.1 302 Found");
		        header("Location: " . $oauth_api->getAuthorizeUri($context));
		        exit;
		    }
		    throw $e;
		}
		catch (\Exception $e)
		{
		    die(sprintf('ERROR: %s', $e->getMessage()));
		}

		return $response;
	}


	public function uploadBanner( $banner_path )
	{
		$body = '';
		$handle = fopen( $banner_path, "rb" );
		$chunkSizeBytes = 1 * 1024 * 1024;
		while( !feof($handle) )
		{
			$body.= fread($handle,$chunkSizeBytes);
		}

		$r = $this->call(
			'POST',
			'https://www.googleapis.com/upload/youtube/v3/channelBanners/insert', 
			array('content-type'=>'image/jpeg'),		// headers
			$body
		);

		if( $r->getStatusCode()==200 )
		{
			$upload_response = json_decode( $r->getBody(), true );
			echo '<pre>'.print_r($upload_response,true).'</pre>';

			$r = $this->call('GET', $this->api_uri.'channels?part=brandingSettings&mine=true' );
			if( $r->getStatusCode()===200 )
			{
				$response = json_decode( $r->getBody(), true );
				$params = array(
				//	"kind"=> $response['items'][0]['kind'],
				//	"etag"=> $response['items'][0]['etag'],
					"id"  => $response['items'][0]['id'],
					'brandingSettings' => array(
						'bannerExternalUrl' => $upload_response['url']
					)
				);

				try
				{
					$request = $this->client->put( $this->api_uri . 'channels?part=brandingSettings&mine=true' );
					$request->setBody( json_encode($params), 'application/json' );

					$res = $request->send();
					echo $res->getStatusCode().'<br>';
					echo $res;
				}
				catch( ClientErrorResponseException $e )
				{
					echo $e->getResponse()->getBody().'<br>';
					echo $e->getMessage().'<br>';
				}
		
			}

		}

	}
}