<?php
if( !class_exists( 'socialmedia_oauth_connect') ) {
	class socialmedia_oauth_connect
	{
		
	  	public $socialmedia_oauth_connect_version = '1.0';
	
		public $client_id;
		public $client_secret;
		public $scope;
		public $responseType;
		public $nonce;
		public $state;
		public $redirect_uri;
		public $code;
		public $oauth_version;
		public $provider;
		public $accessToken;  
		
		protected $requestUrl;
	  	protected $accessTokenUrl;
	  	protected $dialogUrl;
		protected $userProfileUrl;
		protected $header;
		
	  	public function Initialize(){
	  		$this->nonce = time() . rand();
	  		switch($this->provider)
			{
				case '';
					break;
	
				case 'Foursquare':
					$this->oauth_version="2.0";			
					$this->dialogUrl = 'https://foursquare.com/oauth2/authorize?';
					$this->accessTokenUrl = 'https://foursquare.com/oauth2/access_token';
					$this->responseType="code";
					$this->userProfileUrl = "https://api.foursquare.com/v2/users/self?oauth_token=";
					$this->header="";
					break;
			}
	  	}
	  	
	  	public function Authorize(){
	  	
	  		if($this->oauth_version == "2.0"){
	  	    $dialog_url = $this->dialogUrl
	  	    		."client_id=".$this->client_id
				."&response_type=".$this->responseType
				."&scope=".$this->scope
				/*."&nonce=".$this->nonce*/
				."&state=".$this->state
	        	."&redirect_uri=".urlencode($this->redirect_uri);
	     		//echo("<script> top.location.href='" . $dialog_url . "'</script>");
	     		}else{
	
				$date = new DateTime();
	     			$request_url = $this->requestUrl;
	     			$postvals ="oauth_consumer_key=".$this->client_id
	     					."&oauth_signature_method=HMAC-SHA1"
	     					."&oauth_timestamp=".$date->getTimestamp()
	     					."&oauth_nonce=".$this->nonce
	     					."&oauth_callback=".$this->redirect_uri
	     					."&oauth_signature=".$this->client_secret
	     					."&oauth_version=1.0";
	     			$redirect_url = $request_url."".$postvals;
	     			
	   			
	
	     			$oauth_redirect_value= $this->curl_request($redirect_url,'GET','');
	
	  			$dialog_url = $this->dialogUrl.$oauth_redirect_value;
	     			     			
	     			//echo("<script> top.location.href='" . $dialog_url . "'</script>");
	     		}
			return $dialog_url;
	  	}
	  	
	
	  	public function getAccessToken(){
			$postvals = "client_id=".$this->client_id
				."&client_secret=".$this->client_secret
				."&grant_type=authorization_code"
				."&redirect_uri=".urlencode($this->redirect_uri)
				."&code=".$this->code;
			return $this->curl_request($this->accessTokenUrl,'POST',$postvals);
	  	}
	  	
	  	public function getUserProfile(){
	  		$getAccessToken_value = $this->getAccessToken();
	  		$getatoken = json_decode( stripslashes($getAccessToken_value) );
	
			if( $getatoken === NULL ){
				$atoken=$getAccessToken_value;
	   		}else{
		   		$atoken = $getatoken->access_token;
	   		}   
	   		
	   		if($this->provider=="Yammer"){
	   			$atoken = $getatoken->access_token->token;
	   		}
		  	
	  		$profile_url = $this->userProfileUrl."".$atoken.'&v='.date('Ymd', time());
	  		
			return $this->curl_request($profile_url,"GET",$atoken);
			
	  	}
	  	
	  	public function APIcall($url){
		  	return $this->curl_request($url,"GET",$_SESSION['atoken']);
	  	}
	  	
	  	public function debugJson($data){
	  		echo "<pre>";
	  		print_r($data);
	  		echo "</pre>";
	  	}
	  	
		public function curl_request($url,$method,$postvals){
			
			$ch = curl_init($url);
			if ($method == "POST"){
			   $options = array(
		                CURLOPT_POST => 1,
		                CURLOPT_POSTFIELDS => $postvals,
		                CURLOPT_RETURNTRANSFER => 1,
				);
			
			}else{
			
			   $options = array(
		                CURLOPT_RETURNTRANSFER => 1,
				);
			
			}
			curl_setopt_array( $ch, $options );
			if($this->header){
			
				curl_setopt( $ch, CURLOPT_HTTPHEADER, array( $this->header . $postvals) );
			}
			
			$response = curl_exec($ch);
			curl_close($ch);
			#print_r($response);
			return $response;
		}
	
	}
}
?>