FacebookService.php

<?php

/**
 * @author Marcus Nyeholt <marcus@silverstripe.com.au>
 */
class FacebookService {
	
	static $api_urls = array(
		'object'	=> 'https://graph.facebook.com/%s',
		'auth'		=> 'https://graph.facebook.com/oauth/access_token?client_id=%s&client_secret=%s&grant_type=client_credentials',
		'feed'		=> 'https://graph.facebook.com/%s/feed',
		'albums'	=> 'https://graph.facebook.com/%s/albums',
		'photos'	=> 'https://graph.facebook.com/%s/photos',
	);
	
	static $app_id;
	static $app_secret;
	
	static $default_id;
	
	private $cache;
	
	public function webEnabledMethods() {
		return array(
			'getPhotos'		=> 'GET',
			'getObject'		=> 'GET',
		);
	}
	
	public function publicWebMethods() {
		return array(
			'getPhotos'		=> true,
			'getObject'		=> true
		);
	}
	
	public function __construct() {
		$this->cache = SimpleCache::get_cache();
	}
	
	/**
	 *
	 * @param type $id
	 * @param type $limit 
	 */
	public function getFeed($id = null, $limit = 0, $mine = null) {
		if (!$id) {
			$id = self::$default_id;
		}
		
		$token = $this->getAuthToken();
		$key = 'feed-' . $id . '-' . $limit;
		
		if ($token && !($data = $this->cache->get($key))) {
			$url = sprintf(self::$api_urls['feed'], $id) . '?access_token=' . $token;
			if ($limit) {
				$url .= '&limit=' . $limit;
			}
			$data = file_get_contents($url);
			if ($data) {
				$this->cache->store($key, $data, 1800);
			}
		}
		
		if (function_exists('json_decode')) {
			$data = json_decode($data);
		} else {
			$data = Convert::json2obj($data);
		}
		
		$result = new ArrayList();
		if ($data && $data->data) {
			foreach ($data->data as $item) {
				if ($mine) {
					if ($item->from && $item->from->id != $mine) {
						continue;
					}
				}
				$objType = 'FacebookStatus';
				if ($item->type && $item->type == 'photo') {
					
					$item->Photo = new FacebookPhoto($this->getObject($item->object_id));
					
				}
				$result->push(new $objType($item));
			}
			return $result;
		}
	}
	
	/**
	 *
	 * @param type $id
	 * @param type $limit 
	 */
	public function getPhotos($id = null, $limit = 0, $mine = null) {
		if (!$id) {
			$id = self::$default_id;
		}
		
		$token = $this->getAuthToken();
		$key = 'photos-' . $id . '-' . $limit;
		
		if ($token && !($data = $this->cache->get($key))) {
			$url = sprintf(self::$api_urls['photos'], $id) . '?access_token=' . $token;
			if ($limit) {
				$url .= '&limit=' . $limit;
			}
			$data = file_get_contents($url);
			if ($data) {
				$this->cache->store($key, $data, 1800);
			}
		}

		if (function_exists('json_decode')) {
			$data = json_decode($data);
		} else {
			$data = Convert::json2obj($data);
		}
		
		$result = new ArrayList();
		if ($data && $data->data) {
			foreach ($data->data as $item) {
				if ($mine) {
					if ($item->from && $item->from->id != $mine) {
						continue;
					}
				}
				$objType = 'FacebookPhoto';
				$result->push(new $objType($item));
			}
			return $result;
		}
	}
	
	public function getObject($id, $cacheLength = 3600) {
		$key = 'object-' . $id;

		$token = $this->getAuthToken();
		if ($token && !($data = $this->cache->get($key))) {
			$url = sprintf(self::$api_urls['object'], $id) . '?access_token=' . $token;
			$data = file_get_contents($url);
			if ($data) {
				$this->cache->store($key, $data, $cacheLength);
			}
		}

		if (function_exists('json_decode')) {
			$data = json_decode($data);
		} else {
			$data = Convert::json2obj($data);
		}
		return $data;
	}
	
	protected function getAuthToken() {
		$token = Session::get('facebook_token');
		if (!$token) {
			$content = file_get_contents(sprintf(self::$api_urls['auth'], self::$app_id, self::$app_secret));
			if ($content && strpos($content, '=')) {
				list($junk, $token) = explode('=', $content);
				Session::set('facebook_token', $token);
			}
		}
		return $token;
	}
	
}


class FacebookObject extends ViewableData {
	protected $data;
	
	public function __construct($data) {
		$this->data = $data;
	}
	
	public function toMap() {
		return $this->data;
	}
	
	public function __get($field) {
		if (isset($this->data->$field)) {
			return $this->data->$field;
		}
	}

	public function NiceTime($field, $format = 'jS F') {
		return date($format, strtotime($this->$field));
	}
}

class FacebookPhoto extends FacebookObject {
	public function getThumb($index=3) {
		$imgs = $this->images;
		for ($i = $index; $i >= 0; $i--) {
			if (isset($imgs[$i])) {
				return $imgs[$i]->source;
			}
		}
	}
}

class FacebookStatus extends FacebookObject {
	
}