Open Graph

gistfile1.aw

<?php 

/**
 * ...
 */
class OpenGraphNode extends OpenGraph
{
	
	public $id;
	public $object;
	private $connections;

	function __construct($id) {
		parent::__construct();
		
		$this -> id = $id;
		
		$tmp = $this -> api($this -> id . '?metadata=1');
		
		$this -> connections = $tmp -> metadata -> connections;
		unset($tmp -> metadata);
		$this -> object = $tmp;
	}
	
	/*
	*	toString magic method (JSON output)
	*/
         public function __toString(){
		return json_encode($this->object);
         }
	
	function __get($name) {
		if (isset($this -> connections -> $name)) {
			return new OpenGraphNodeList($this -> connections -> $name);
		}
		elseif (isset($this -> object -> $name)) {
			return $this -> object -> $name;
		}
		else {
			throw new Exception();
		}
	}
}

/**
 * ...
 */
class OpenGraphNodeList extends OpenGraph implements SeekableIterator
{
	private $pointer = 0;
	public $data;
	public $paging;
	
	function __construct($path) {
		parent::__construct();
		
		$tmp = $this -> api($path);
		if (isset($tmp -> error)) {
			$ExceptionType = $tmp -> error -> type;
			throw new $ExceptionType($tmp -> error -> message, $tmp -> error -> code);
		}
		
		$this -> data = $tmp -> data;
		
		if (isset($tmp -> paging)) {
			$this -> paging = $tmp -> paging;
			$this -> paging -> current = $path;
		}
	}
	
	/*
	*	toString magic method (JSON output)
	*/
        public function __toString(){
		return json_encode($this->data);
        }
	
	public function seek($position) {
		while (!isset($this -> data[$position])) {
			$this -> next();
		}
		$this -> pointer = $position;
		
		return $this -> current();
	}
	
	function rewind() {
		$this -> pointer = 0;
	}

    function current() {
        return new OpenGraphNode($this -> data[$this -> pointer] -> id);
    }

    function key() {
        return $this -> pointer;
    }

    function next() {
        ++$this -> pointer;
        if (!isset($this -> data[$this -> pointer]) && isset($this -> paging -> next)) {
        	$tmp = new OpenGraphNodeList($this -> paging -> next);
        	
        	if (isset($tmp -> data[0])) {
        		foreach ($tmp -> data as $k => $v) {
        			array_push($this -> data, $v);
        		}
        	}
        }
        elseif (!isset($this -> data[$this -> pointer])) {
        	throw new OutOfBoundsException('Invalid next position (' . $this -> pointer . ')');
        }
    }

    function valid() {
        return isset($this -> data[$this -> pointer]);
    }
}

/**
 * ...
 */
class OpenGraph
{
	private $curl;
	public $access_token = 'AAACfS1ZAM1AwBAHYg9XMWWsz0nvSepgvgB6Np8U5sC2TqY9Ey4KyeR2nm2ZAWPZAbCbsHIfgUbb0IqeBr4qSavdPZAJ9QqHOGe2I8qLPKrxavKzmcZCH6';
	
	function __construct() {
		$this -> curl = curl_init();
		curl_setopt($this -> curl, CURLOPT_HEADER, 0);
		curl_setopt($this -> curl, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($this -> curl, CURLOPT_SSL_VERIFYPEER, 0); 
	}
	
	function __destruct() {
		curl_close($this -> curl);
	}
	
	protected function api($path) {
		if (!filter_var($path, FILTER_VALIDATE_URL)) {
			$path = 'http://graph.facebook.com/' . $path;
		}
		
		$parsed_url = parse_url($path);
		$parsed_url['scheme'] = 'https';
		
		parse_str((isset($parsed_url['query']) ? $parsed_url['query'] : ''), $parsed_str);
		if (!isset($parsed_str['access_token'])) {
			$parsed_str['access_token'] = $this -> access_token;
		}
		$parsed_url['query'] = http_build_query($parsed_str);
		
		$path = $parsed_url['scheme'] . '://' . $parsed_url['host'] . $parsed_url['path'] . '?' . $parsed_url['query'];
		
		curl_setopt($this -> curl, CURLOPT_URL, $path);
		return json_decode(curl_exec($this -> curl));
	}
}