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Posted By

khalidity on 02/23/11


Tagged

php facebook OAuth


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Generating Session Parameters from Facebook Access Token

 / Published in: PHP
 

Useful if you want to generate a cookie to be used by facebook PHP-SDK, when you only have an access_token generate from "code" query string

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  1. define('APP_SECRET','XXXXXXXXXXXXXXXXX'); 
  2.  
  3. function generateSessionVars($accessToken)
  4.  {
  5.  $e = explode('|',$accessToken);
  6.    $s = explode('-',$e[1]);
  7.  
  8.  
  9.   $params = array(
  10. 					'uid'=>trim($s[1]),
  11. 					'session_key'=>trim($e[1]),
  12. 					'access_token' => trim($accessToken),
  13. 					'secret' => APP_SECRET,
  14. 				 ); 
  15.   $params['sig'] = generateSignature($params,APP_SECRET);	
  16.  
  17.   return $params;				 
  18.  }
  19.  
  20.  
  21.   function generateSignature($params,$secret) {
  22.  
  23.   // work with sorted data
  24.     ksort($params);
  25.  
  26.     // generate the base string
  27.     $base_string = '';
  28.     foreach($params as $key => $value) {
  29.       $base_string .= $key . '=' . $value;
  30.     }
  31.     $base_string .= $secret;
  32.  
  33.     return md5($base_string);
  34.   }

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