Auth tipo para comprobar que alguien pertenece a una organización. Se puede pegar en el config.inc.php de PHPMyadmin

github_oauth.php

<?php
$client_id = CLIENT_ID;
 $redirect_url = REDIRECT_URL;
 $client_secret=CLIENT_SECRET;
$organizacion=ORGANIZATION;


 
if( empty($_COOKIE[$organizacion]) || sha1($_COOKIE[$client_id].$cfg['blowfish_secret'])!=$_COOKIE[$organizacion]) {
 
 $code = $_GET['code'];
  if(empty($code)) {
	 $url = "https://github.com/login/oauth/authorize?client_id=$client_id&redirect_uri=$redirect_url&scope=user";
		            header("Location: $url");
	} else {
		$post = http_build_query(array(
                'client_id' => $client_id ,
                'redirect_uri' => $redirect_url ,
                'client_secret' => $client_secret,
                'code' => $code 
            ));          
            $context = stream_context_create(array("http" => array(
                "method" => "POST",
                "header" => "Content-Type: application/x-www-form-urlencoded\r\n" .
                            "Content-Length: ". strlen($post) . "\r\n".
                            "Accept: application/json" ,  
                "content" => $post,
            ))); 
            
            if($json_data = file_get_contents("https://github.com/login/oauth/access_token", false, $context)) {
            
            $r = json_decode($json_data , true);
            $access_token = $r['access_token'];
        
            if(isset($access_token)) {
    
                    
			    $organizations=file_get_contents("https://api.github.com/user/orgs?access_token=$access_token");
			    $organizations = json_decode($organizations , true);


			                    $orglogin=array();
			                    foreach($organizations as $organization) {
			                        $orglogin[]=$organization['login'];
			                    }
						if(in_array($organizacion,$orglogin)) {
						     setcookie($client_id, $access_token,time()+3600,"/","",1,1);
                                                     setcookie($organizacion, sha1($_COOKIE[$client_id].$cfg['blowfish_secret']),time()+3600,"/","",1,1);

						} else {
						    die ('No autorizado 1');
						}
		                } else {
		                  $url = "https://github.com/login/oauth/authorize?client_id=$client_id&redirect_uri=$redirect_url&scope=user";
				            header("Location: $url");
		                }
		            }
	}
}