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<?php
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/**
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* Simple oAuth wrapper for Facebook
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* Designed to stream line log in and token exchange
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* By Matt Mecham (Invision Power Services, Inc)
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* http://www.invisionpower.com
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* April 2010
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*
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* Version 0.1
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*/
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class FacebookOAuth
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{
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/**
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* Facebook Application ID
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* @var int
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* @access private
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*/
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private $_appId;
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/**
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* Facebook Application Secret
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* @var string
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* @access private
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*/
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private $_appSecret;
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/**
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* Call back URL
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* URL to redirect oAuth requests to after processing at Facebook
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* @var string
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* @access private
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*/
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private $_callBackUrl;
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/**
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* Permissions scope
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* Array containing required permissions
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* @var array
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* @access private
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*/
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private $_permsScope = array();
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/**
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* Form Factor
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* @link http://developers.facebook.com/docs/authentication/
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* @var string
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* @access private
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*/
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private $_formFactor = '';
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/**
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* Last http code (200, 403, etc)
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* @var string
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* @access public
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*/
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public $httpCode;
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/**
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* Last API call
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* @var string
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* @access public
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*/
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public $lastApiCall;
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/**
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* Timeout
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* @var int
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* @access public
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*/
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public $timeout = 30;
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/**
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* Connect timeout
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* @var int
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* @access public
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*/
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public $connectTimeout = 30;
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/**
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* SSL verify peer
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* @var string
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* @access public
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*/
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public $sslVerifyPeer = FALSE;
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/**
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* Constant for authorize URL
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*/
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const AUTHORIZE_URL = 'https://graph.facebook.com/oauth/authorize';
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/**
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* Constant for access token
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*/
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const ACCESS_TOKEN_URL = 'https://graph.facebook.com/oauth/access_token';
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/**
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* Constructor
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*
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* @access public
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* @param int application id
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* @param string application secret
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* @param string callback URL
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* @param string Form factor
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* @param array Array of permissions array( 'email', 'publish_stream' ), etc
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*/
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public function __construct( $appId, $appSecret, $callBackUrl, $permsScope, $formFactor='page' )
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{
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$this->_appId = $appId;
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$this->_appSecret = $appSecret;
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$this->setCallBackUrl( $callBackUrl );
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$this->setPermissionsScope( $permsScope );
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$this->setFormFactor( $formFactor );
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}
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/**
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* Set FormFactor
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* Although we require this in the contructor, the calling class may wish
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* to change it to add other parameters
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*
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* @access public
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* @param string
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*/
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public function setFormFactor( $formFactor )
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{
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if ( $formFactor )
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{
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$this->_formFactor = $formFactor;
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}
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}
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/**
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* Set Call back URL
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* Although we require this in the contructor, the calling class may wish
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* to change it to add other parameters
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*
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* @access public
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* @param string
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*/
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public function setCallBackUrl( $url )
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{
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if ( $url )
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{
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$this->_callBackUrl = $url;
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}
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}
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/**
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* Set Permissions required for auth token
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* Although we require this in the contructor, the calling class may wish
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* to change it to add other parameters
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*
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* @access public
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* @param string
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*/
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public function setPermissionsScope( $permsScope )
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{
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if ( is_array( $permsScope ) )
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{
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$this->_permsScope = $permsScope;
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}
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else if ( strstr( $permsScope, ',' ) )
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{
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$this->_permsScope = explode( ',', str_replace( ' ', '', $permsScope ) );
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}
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}
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/**
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* Get Authorize URL
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* Returns a full authorize URL
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*
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* @access public
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* @return string URL
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*/
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public function getAuthorizeUrl()
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{
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$_e = ( count( $this->_permsScope ) ) ? '&scope=' . implode( ',', $this->_permsScope ) : '';
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$_f = ( $this->_formFactor ) ? '&display=' . $this->_formFactor : '';
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return self::AUTHORIZE_URL . '?client_id=' . $this->_appId . '&redirect_uri=' . urlencode( $this->_callBackUrl ) . $_e . $_f;
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}
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/**
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* Authorize
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* Accepts a code, uses CURL to return a final access token
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*
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* @access public
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* @param string Code from authorize
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* @return mixed Access token or JSON error
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*/
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public function getAccessToken( $code )
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{
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$url = self::ACCESS_TOKEN_URL . '?client_id=' . $this->_appId . '&redirect_uri=' . urlencode( $this->_callBackUrl ) . '&client_secret=' . $this->_appSecret . '&code=' . rawurlencode( $code );
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/* Send it and hope to receive access_token=blah */
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$result = $this->_send( $url, 'GET' );
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if ( preg_match( "#^access_token=(.*)$#", $result, $match ) )
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{
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return $match[1];
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}
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else
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{
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/* Likely to be an error in json */
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return json_decode( $result );
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}
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}
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/**
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* Make an HTTP request
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*
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* @param private
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* @param string URL
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* @param string Method (post or get)
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* @param array Post data to send
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* @return API results
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*/
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private function _send($url, $method='POST', $postfields=NULL)
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{
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/* Compress post fields */
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if ( is_array( $postfields ) AND count( $postfields ) )
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{
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$_postfields = $postfields;
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$postfields = '';
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foreach( $_postfields as $k => $v )
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{
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$postfields .= $k . '=' . $v . '&';
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}
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$postfields = trim( $postfields, '&' );
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}
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/* Attempt CURL */
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if ( function_exists( 'curl_init' ) AND function_exists("curl_exec") )
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{
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$ci = curl_init();
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/* Curl settings */
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curl_setopt( $ci, CURLOPT_CONNECTTIMEOUT, $this->connectTimeout );
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curl_setopt( $ci, CURLOPT_TIMEOUT, $this->timeout );
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curl_setopt( $ci, CURLOPT_RETURNTRANSFER, TRUE );
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curl_setopt( $ci, CURLOPT_HTTPHEADER, array('Expect:') );
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curl_setopt( $ci, CURLOPT_SSL_VERIFYPEER, $this->sslVerifyPeer );
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switch ($method)
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{
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case 'POST':
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curl_setopt($ci, CURLOPT_POST, TRUE);
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if ( ! empty( $postfields) )
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{
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curl_setopt($ci, CURLOPT_POSTFIELDS, $postfields);
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}
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break;
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case 'DELETE':
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curl_setopt($ci, CURLOPT_CUSTOMREQUEST, 'DELETE');
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if ( ! empty( $postfields ) )
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{
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$url = "{$url}?{$postfields}";
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}
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break;
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}
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curl_setopt( $ci, CURLOPT_URL, $url );
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$response = curl_exec( $ci );
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$this->httpCode = curl_getinfo( $ci, CURLINFO_HTTP_CODE );
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$this->lastApiCall = $url;
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curl_close ($ci);
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if( $response )
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{
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return $response;
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}
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}
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$url_parts = @parse_url($url);
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if ( ! $postfields )
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{
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$postfields = str_replace( '&', '&', $url_parts['query'] );
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}
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/* Use SSL rather than https */
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$url_parts['scheme'] = ( $url_parts['scheme'] == 'https' ) ? 'ssl' : $url_parts['scheme'];
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$host = $url_parts['scheme'] . '://' . $url_parts['host'];
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$port = ( isset($url_parts['port']) ) ? $url_parts['port'] : ( $url_parts['scheme'] == 'https' || $url_parts['scheme'] == 'ssl' ? 443 : 80 );
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if ( !empty( $url_parts["path"] ) )
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{
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$path = $url_parts["path"];
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}
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else
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{
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$path = "/";
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}
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$header = "POST {$path} HTTP/1.0\r\n";
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$header .= "Host: " . str_replace( array( 'http://', 'https://', 'ssl://' ), '', $host ) . "\r\n";
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$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
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$header .= "Content-Length: " . strlen($postfields) . "\r\n\r\n";
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if ( $fp = fsockopen( $host, $port, $errno, $errstr, $this->timeout ) )
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{
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socket_set_timeout($fp, $this->timeout);
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fwrite($fp, $header . $postfields);
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while( ! feof($fp) && ! $status['timed_out'] )
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{
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$data .= fgets ($fp,8192);
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$status = stream_get_meta_data($fp);
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}
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fclose($fp);
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}
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/* Strip headers HTTP/1.1 ### ABCD */
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$this->httpCode = substr( $data, 9, 3 );
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$this->lastApiCall = $url;
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/* Chuncked? */
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$_chunked = false;
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if( preg_match( "/Transfer\-Encoding:\s*chunked/i", $data ) )
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{
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$_chunked = true;
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}
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$tmp = explode("\r\n\r\n", $data, 2);
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$data = trim($tmp[1]);
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if( $_chunked )
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{
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$lines = explode( "\n", $data );
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array_pop($lines);
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array_shift($lines);
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$data = implode( "\n", $lines );
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}
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return $data;
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}
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}
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