facebook.php

<?php

class FacebookBase {
	public static $curlOpts = array(
		CURLOPT_CONNECTTIMEOUT => 10,
		CURLOPT_RETURNTRANSFER => true,
		CURLOPT_TIMEOUT        => 60,
		CURLOPT_USERAGENT      => 'facebook-php',
	);

	public function curl($url = '', $get = array(), $post = array()) {
		$opts = self::$curlOpts;

		if (!empty($get)) $url .= '?'.http_build_query($get);

		if (!empty($post)) $opts[CURLOPT_POSTFIELDS] = http_build_query($post, '', '&', PHP_QUERY_RFC3986);

		$opts[CURLOPT_URL] = $url;

		$ch = curl_init();

		curl_setopt_array($ch, $opts);

		$content = curl_exec($ch);

		curl_close($ch);

		return $content;
	}

	public function graph($url = '', $getParams = array(), $postParams = array()) {
		$response = $this->curl('https://graph.facebook.com/'.$url, $getParams, $postParams);

		$responseJSON = json_decode($response, false);

		parse_str($response, $responseParam);

		return (object) (
			!empty($responseJSON) ? $responseJSON : (
				!empty($responseParam) ? $responseParam : array(
					'content' => $response
				)
			)
		);
	}

	public function currentURL() {
		$isHTTPS  = $_SERVER['HTTPS'] === 'on';
		$isPorted = $_SERVER['SERVER_PORT'] !== ($isHTTPS ? '443' : '80');
		$protocol = $isHTTPS ? 'https' : 'http';
		$port     = $isPorted ? ':'.$_SERVER['SERVER_PORT'] : '';

		return $protocol.'://'.$_SERVER['SERVER_NAME'].$port.$_SERVER['REQUEST_URI'];
	}

	public function has($var = '') {
		return !empty($this->{$var});
	}
}

class Facebook extends FacebookBase {
	private $appID;
	private $appSecret;
	private $authCode;
	private $authToken;

	private $accounts = array();
	private $authTokens = array();

	public function __construct($options = array(), $save = false) {
		$this->authCode  = $_GET['code'];
		$this->authToken = $_GET['access_token'];

		foreach ($options as $key => $value) $this->$key = $value;
	}

	public function initAuthCode() {
		if (empty($this->authCode)) {
			header(
				'Location: '.
				sprintf(
					'https://www.facebook.com/dialog/oauth?scope=%s&response_type=%s&client_id=%s&redirect_uri=%s',
					'manage_pages,publish_stream',
					'code',
					$this->appID,
					$this->currentURL()
				)
			);
		}
	}

	public function initAuthToken() {
		if (empty($this->authToken)) {
			$response = $this->graph('oauth/access_token', array(
				'client_id' => $this->appID,
				'client_secret' => $this->appSecret,
				'grant_type' => 'client_credentials'
			));

			if (!$response->error) $this->authToken = $response->access_token;

			return $response;
		}
	}

	public function initActiveAuthToken() {
		if (empty($this->authToken)) {
			$response = $this->graph('oauth/access_token', array(
				'client_id' => $this->appID,
				'client_secret' => $this->appSecret,
				'code' => $this->authCode,
				'redirect_uri' => $this->currentURL()
			));

			if (!$response->error) $this->authToken = $response->access_token;

			return $response;
		}
	}

	public function initProfile() {
		$response = $this->graph('me', array(
			'access_token' => $this->authToken
		));

		if (!$response->error) {
			$this->profile = $response;

			$this->authTokens[$response->id] = $this->authToken;
		}

		return $response;
	}

	public function initAccounts() {
		$response = $this->graph('me/accounts', array(
			'access_token' => $this->authToken
		));

		if (!$response->error) {
			foreach ($response->data as &$account) {
				$this->authTokens[$account->id] = $account->access_token;

				unset($account->access_token);

				$this->accounts[$account->id] = $account;
			}
		}

		return $response;
	}

	public function feed($id = '', $maximum = 10) {
		if (!empty($id)) {
			return $this->graph($id.'/feed', array(
				'access_token' => $this->authToken,
				'limit' => $maximum
			));
		}
	}

	public function post($id = '', $options = array()) {
		if ($id === 'profile') $id = $this->profile->id;

		$authToken = empty($this->authTokens[$id]) ? $this->authToken : $this->authTokens[$id];

		return $this->graph($id . '/feed', null, array_merge(array(
			'access_token' => $authToken
		), $options));
	}
}