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<?php
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// $Id: chatroomread.php,v 1.29.4.7 2009/10/29 18:04:12 justinrandell Exp $
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/**
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* @file
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* Process chatroom polling requests.
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*
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* This file is a performance hack, aimed at making moderately sized rooms
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* possible with this module.
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*
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* The intent is to handle the polling requests from chatrooms without doing
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* a full Drupal bootstrap unless absolutely necessary. All simple polling
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* requests are handled by this script, as they are by far the most common
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* type of request, and are very easy to check against a cache.
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*
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* First, we check to see if the last message seen in a given chat client-side
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* is older than the latest message in that chat server-side.
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*
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* Only if the chat being polled has messages newer than what the requesting
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* client has seen do we bootstrap Drupal.
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*/
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// We need the $last_msg_id, $chat_id and $chat_cache_file to check the
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// cache for this chat.
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if (!isset($_POST['latest_msg_id']) || !preg_match('/^\d+$/', $_POST['latest_msg_id'])) {
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exit;
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}
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$client_latest_msg_id = $_POST['latest_msg_id'];
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if (!isset($_POST['chat_id']) || !preg_match('/^\d+$/', $_POST['chat_id'])) {
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exit;
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}
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$chat_id = $_POST['chat_id'];
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if (!isset($_POST['chat_cache_directory']) || !is_dir($_POST['chat_cache_directory'])) {
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exit;
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}
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$chat_cache_file = $_POST['chat_cache_directory'] . '/chatroom.chat.' . $chat_id . '.cache';
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if (!isset($_POST['skip_cache'])) {
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exit;
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}
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$skip_cache = $_POST['skip_cache'] == 1 ? TRUE : FALSE;
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// We let the client signal that we should skip the cache. Right now we're
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// using this to make sure user's last-seen time is updated, and there may
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// be more uses for it down the track.
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if (!$skip_cache && file_exists($chat_cache_file)) {
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// Do a quick DoS check - we don't validate the path, so we have to make
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// sure we're not reading arbitrarily big files into memory. Our cache file
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// should contain a single numeric id. So, if the file is bigger than 25
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// bytes, something is fishy, and we should just bail out.
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$file_stats = stat($chat_cache_file);
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if ($file_stats['size'] > 25) {
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exit;
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}
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$server_latest_msg_id = trim(file_get_contents($chat_cache_file));
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if ($server_latest_msg_id == $client_latest_msg_id) {
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print json_encode(array('data' => array('cacheHit' => 1, 'messages' => array())));
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exit;
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}
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}
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// Make this look like a normal request to Drupal, then execute index.php.
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$_GET['q'] = "chatroom/chat/get/latest/messages/$chat_id/$client_latest_msg_id";
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require_once './index.php';
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