<?php
/*
TODO :
- factorize the annotation system
- factorize to adapter : Format, Bridge, Cache(actually code is almost the same)
- implement annotation cache for entrance page
- Cache : I think logic must be change as least to avoid to reconvert object from json in FileCache case.
- add namespace to avoid futur problem ?
- see FIXME mentions in the code
- implement header('X-Cached-Version: '.date(DATE_ATOM, filemtime($cachefile)));
*/

//define('PROXY_URL', 'tcp://192.168.0.0:28');
// Set to true if you allow users to disable proxy usage for specific bridges
define('PROXY_BYBRIDGE', false);
// Comment this line or keep PROXY_NAME empty to display PROXY_URL instead
define('PROXY_NAME', 'Hidden Proxy Name');

date_default_timezone_set('UTC');
error_reporting(0);

/*
  Create a file named 'DEBUG' for enabling debug mode.
  For further security, you may put whitelisted IP addresses
  in the 'DEBUG' file, one IP per line. Empty file allows anyone(!).
  Debugging allows displaying PHP error messages and bypasses the cache: this can allow a malicious
  client to retrieve data about your server and hammer a provider throught your rss-bridge instance.
*/
if(file_exists('DEBUG')){
	$debug_enabled = true;
	$debug_whitelist = trim(file_get_contents('DEBUG'));
	if(strlen($debug_whitelist) > 0){
		$debug_enabled = false;
		foreach(explode("\n", $debug_whitelist) as $allowed_ip){
			if(trim($allowed_ip) === $_SERVER['REMOTE_ADDR']){
				$debug_enabled = true;
				break;
			}
		}
	}
	if($debug_enabled){
		ini_set('display_errors', '1');
		error_reporting(E_ALL);
		define('DEBUG', 'true');
	}
}

require_once __DIR__ . '/lib/RssBridge.php';

// extensions check
if(!extension_loaded('openssl'))
	die('"openssl" extension not loaded. Please check "php.ini"');

// FIXME : beta test UA spoofing, please report any blacklisting by PHP-fopen-unfriendly websites
ini_set('user_agent', 'Mozilla/5.0(X11; Linux x86_64; rv:30.0)
 Gecko/20121202 Firefox/30.0(rss-bridge/0.1;
 +https://github.com/sebsauvage/rss-bridge)');

// default whitelist
$whitelist_file = './whitelist.txt';
$whitelist_default = array(
	"BandcampBridge",
	"CryptomeBridge",
	"DansTonChatBridge",
	"DuckDuckGoBridge",
	"FacebookBridge",
	"FlickrExploreBridge",
	"GooglePlusPostBridge",
	"GoogleSearchBridge",
	"IdenticaBridge",
	"InstagramBridge",
	"OpenClassroomsBridge",
	"PinterestBridge",
	"ScmbBridge",
	"TwitterBridge",
	"WikipediaBridge",
	"YoutubeBridge");

if(!file_exists($whitelist_file)){
	$whitelist_selection = $whitelist_default;
	$whitelist_write = implode("\n", $whitelist_default);
	file_put_contents($whitelist_file, $whitelist_write);
} else {
	$whitelist_selection = explode("\n", file_get_contents($whitelist_file));
}

Cache::purge();

try {

	Bridge::setDir(__DIR__ . '/bridges/');
	Format::setDir(__DIR__ . '/formats/');
	Cache::setDir(__DIR__ . '/caches/');

	$action = filter_input(INPUT_GET, 'action');
	$bridge = filter_input(INPUT_GET, 'bridge');

	if($action === 'display' && !empty($bridge)){
		// DEPRECATED: 'nameBridge' scheme is replaced by 'name' in bridge parameter values
		//             this is to keep compatibility until futher complete removal
		if(($pos = strpos($bridge, 'Bridge')) === (strlen($bridge) - strlen('Bridge'))){
			$bridge = substr($bridge, 0, $pos);
		}

		$format = filter_input(INPUT_GET, 'format');

		// DEPRECATED: 'nameFormat' scheme is replaced by 'name' in format parameter values
		//             this is to keep compatibility until futher complete removal
		if(($pos = strpos($format, 'Format')) === (strlen($format) - strlen('Format'))){
			$format = substr($format, 0, $pos);
		}

		// whitelist control
		if(!Bridge::isWhitelisted($whitelist_selection, $bridge)){
			throw new \HttpException('This bridge is not whitelisted', 401);
			die;
		}

		$cache = Cache::create('FileCache');

		// Data retrieval
		$bridge = Bridge::create($bridge);
		if(!defined("DEBUG"))
			$bridge->setCache($cache);

		$noproxy = filter_input(INPUT_GET, '_noproxy', FILTER_VALIDATE_BOOLEAN);
		if(defined('PROXY_URL') && PROXY_BYBRIDGE && $noproxy)
			$bridge->useProxy = false;

		$params = $_GET;
		unset($params['action']);
		unset($params['bridge']);
		unset($params['format']);
		unset($params['_noproxy']);
		$bridge->setDatas($params);

		// Data transformation
		try {
			$format = Format::create($format);
			$format
				->setItems($bridge->getItems())
				->setExtraInfos(array(
					'name' => $bridge->getName(),
					'uri' => $bridge->getURI(),
				))
				->display();
		} catch(Exception $e){
			echo "The bridge has crashed. You should report this to the bridges maintainer";
		}
		die;
	}
}

catch(HttpException $e){
	header('HTTP/1.1 ' . $e->getCode() . ' ' . Http::getMessageForCode($e->getCode()));
	header('Content-Type: text/plain');
	die($e->getMessage());
}

catch(\Exception $e){
	die($e->getMessage());
}

$formats = Format::searchInformation();

?>
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<meta name="description" content="Rss-bridge" />
	<title>RSS-Bridge</title>
	<link href="css/style.css" rel="stylesheet">
</head>

<body>

	<header>
		<h1>RSS-Bridge</h1>
		<h2>·Reconnecting the Web·</h2>
	</header>
	<?php
		$activeFoundBridgeCount = 0;
		$showInactive = filter_input(INPUT_GET, 'show_inactive', FILTER_VALIDATE_BOOLEAN);
		$inactiveBridges = '';
		$bridgeList = Bridge::listBridges();
		foreach($bridgeList as $bridgeName){
			if(Bridge::isWhitelisted($whitelist_selection, $bridgeName)){
				echo HTMLUtils::displayBridgeCard($bridgeName, $formats);
						$activeFoundBridgeCount++;
			} elseif($showInactive) {
				// inactive bridges
				$inactiveBridges .= HTMLUtils::displayBridgeCard($bridgeName, $formats, false) . PHP_EOL;
			}
		}
		echo $inactiveBridges;
	?>
	<section>
		<a href="https://github.com/sebsauvage/rss-bridge">RSS-Bridge alpha 0.2 ~ Public Domain</a><br />
		<?= $activeFoundBridgeCount; ?>/<?= count($bridgeList) ?> active bridges. <br />
		<?php
			if($activeFoundBridgeCount !== count($bridgeList)){
				// FIXME: This should be done in pure CSS
				if(!$showInactive)
					echo '<a href="?show_inactive=1"><button class="small">Show inactive bridges</button></a><br />';
				else
					echo '<a href="?show_inactive=0"><button class="small">Hide inactive bridges</button></a><br />';
			}
		?>
	</section>
	</body>
</html>