Educaedu Facebook UI

facebook.ui.php

<?php
	require 'facebook.php';
	header('P3P:CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"');
	
	class Facebook_UI extends Facebook {
		// Get secret app secret
		function getSecret() {
			return $this->appSecret;
		}

		// Get Signed Request
		// More info: https://developers.facebook.com/docs/authentication/signed_request/
		function getSignedRequest() {
			if($this->user == 0 || $this->getSecret() == '')
				return 0;

			list($encoded_sig, $payload) = explode('.', $_REQUEST['signed_request'], 2); 
			$sig = base64_decode(strtr($encoded_sig, '-_', '+/'));
			$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
			if (strtoupper($data['algorithm']) !== 'HMAC-SHA256') {
				error_log('Unknown algorithm. Expected HMAC-SHA256');
				return null;
			}
			$expected_sig = hash_hmac('sha256', $payload, $this->getSecret(), $raw = true);
			if ($sig !== $expected_sig) {
				error_log('Bad Signed JSON signature!');
				return null;
			}
			return $data;
		}

		// Get anything
		function get($string = '19292868552') {
			$this->user = $this->getUserFromAvailableData();

			if($this->user == 0)
				return $this->user;

			return $this->api("/$string");
		}

		// Get user (user id, empty for 'me')
		function getUser($userId = 0) {
			$this->user = $this->getUserFromAvailableData();

			if($this->user == 0)
				return $this->user;

			if($userId == 0) {
				return $this->api("/me");
			} else {
				return $this->api("/$userId");
			}
		}

		// Get friends
		function getFriends() {
			$this->user = $this->getUserFromAvailableData();

			if($this->user == 0)
				return $this->user;

			$response = $this->api("/me/friends");
			return $response['data'];
		}

		// Get accepted permissions
		function getPermissions() {
			$this->user = $this->getUserFromAvailableData();

			if($this->user == 0)
				return $this->user;

			$response = $this->api('/me/permissions');
			return $response['data'][0];
		}

		// Send application request
		function sendRequest($users_array, $message) {
			$ids = implode(",", $users_array);
			$message = urlencode($message);

			if($this->user == 0)
				return $this->user;

			$reponse = $this->api("/apprequests/?ids=$ids&message=$message&method=post&access_token=".$this->getAccessToken());
		}

		// Get login status
		function isLogged() {
			$this->user = $this->getUserFromAvailableData();

			if($this->user == 0) {
				return 0;
			} else {
				return 1;
			}
		}

		// Run FQL Query
		function fqlQuery($query) {
			$this->user = $this->getUserFromAvailableData();

			if($this->user != 0 && $query != '') {
				try {
					$fql = urlencode($query);
					$response = $this->api("/fql?q=$fql");
					return $response['data'];
				} catch (FacebookApiException $e) {
					$this->error($e);
				}
			}
		}

		// Throw exception
		function error($error) {
			throw new Exception($error->getMessage());
		}
	}


	// Example
	// ---------------------------------------------------------------------------
	$fbui = new Facebook_UI(array(
		'appId'	=> '357032601034491',
		'secret' => '93bbbc286e43115af9fc4890c885955e',
		'cookie' => true
	));

	echo "<pre>";

	echo "<h3>App id:</h3>";
	echo $fbui->getAppId();

	echo "<h3>App secret:</h3>";
	echo $fbui->getSecret();

	echo "<h3>is logged?:</h3>";
	print_r($fbui->isLogged());

	echo "<h3>Get signed request:</h3>";
	print_r($fbui->getSignedRequest());

	echo "<h3>Login URL:</h3>";
	$loginURL = $fbui->getLoginUrl(array(
		scope => ''
	));
	echo '<a target="_top" href="'.$loginURL.'">'.$loginURL.'</a>';

	echo "<h3>Logout URL:</h3>";
	$loginURL = $fbui->getLogoutUrl(array(
		'next' => 'https://apps.facebook.com/educaedu_fbclass/'
	));
	echo '<a target="_top" href="'.$loginURL.'">'.$loginURL.'</a>';

	echo "<h3>Get:</h3>";
	print_r($fbui->get());

	echo "<h3>Get user (myself):</h3>";
	print_r($fbui->getUser());

	echo "<h3>User user (a friend):</h3>";
	print_r($fbui->getUser('100001271711241'));

	echo "<h3>FQL Query:</h3>";
	print_r($fbui->fqlQuery('SELECT name FROM user WHERE uid = me()'));

	echo "<h3>Get permissions:</h3>";
	print_r($fbui->getPermissions());

	echo "<h3>Get my friends:</h3>";
	print_r($fbui->getFriends());

	echo "<h3>Send app request:</h3>";
	echo ($fbui->sendRequest(array('100002888807310'), 'Mensaje de prueba'));
?>