CN/server.php at master · andy94077/CN · GitHub

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<?php
	ob_start();
   	session_start();
	ini_set('display_errors', 1);
	ini_set('display_startup_errors', 1);

	if(!$_SESSION['valid'])
		header('Location: index.php');

	if(file_exists('passwd'))
		$dict = json_decode(file_get_contents('passwd'), true);
	else
		$dict = array();

	if ($_POST['from_user'] !== $_SESSION['username'] || !array_key_exists($_POST['to_user'], $dict))
		return;

	if(strcmp($_POST['from_user'], $_POST['to_user']) < 0)
		$chat_file_path = 'chat/'.$_POST['from_user'].'|'.$_POST['to_user'];
	else
		$chat_file_path = 'chat/'.$_POST['to_user'].'|'.$_POST['from_user'];


	if (!file_exists($chat_file_path)){
		echo '';
		return;
	}

	if(file_exists('new_message/'.$_POST['from_user'].'/'.$_POST['to_user']))
		unlink('new_message/'.$_POST['from_user'].'/'.$_POST['to_user']);

	$f = fopen($chat_file_path, 'rb');
	fseek($f, 0, SEEK_END);
	$tail = ftell($f);

	$_POST['pos'] = intval($_POST['pos']);
	if($tail === $_POST['pos'])
		http_response_code(304);
	else{
		fseek($f, $_POST['pos'], SEEK_SET);
		$data = fread($f, $tail - $_POST['pos']);
		$json = array('pos' => $tail, 'message' => $data);
		echo json_encode($json);
	}
?>