Initial commit: delta-chat-bot

2026-06-13 15:53:05 +08:00 · 2026-06-13 15:53:05 +08:00 · 8f47610133
commit 8f47610133
10 changed files with 3603 additions and 0 deletions
--- a/php-proxy/rss.php
+++ b/php-proxy/rss.php
@ -0,0 +1,99 @@
+<?php
+/**
+ * Telegram RSS Proxy with cache
+ *
+ * GET /rss.php?channel=CHANNEL&limit=N
+ * or via .htaccess rewrite: /rss/CHANNEL?limit=N
+ *
+ * Returns RSS XML from local cache (if fresh) or proxies from tg.i-c-a.su.
+ * Enclosure URLs are rewritten to go through media.php for local caching.
+ * Cache files are pre-rewritten so cache hits avoid DOMDocument entirely.
+ */
+
+define('CACHE_DIR', __DIR__ . '/cache');
+define('TG_BASE', 'https://tg.i-c-a.su');
+define('PROXY_BASE', 'https://proxy.budaev.org');
+define('UA', 'Mozilla/5.0 (compatible; ProxyBot/1.0)');
+define('CACHE_TTL', 600);
+
+$channel = preg_replace('/[^a-zA-Z0-9_]/', '', $_GET['channel'] ?? '');
+if (!$channel) {
+    header('HTTP/1.1 400 Bad Request');
+    echo 'Missing channel parameter';
+    exit;
+}
+
+$limit = min(max((int)($_GET['limit'] ?? 10), 1), 100);
+
+// Staggered TTL: vary per channel to avoid mass expiration
+$stagger = crc32($channel) % 300;
+$ttl = CACHE_TTL + $stagger;
+
+// Non-standard limits: fetch directly, no caching
+if ($limit !== 10) {
+    $xml = fetchFeed($channel, $limit, true);
+    if ($xml === null) {
+        header('HTTP/1.1 502 Bad Gateway');
+        echo 'Failed to fetch feed';
+        exit;
+    }
+    header('Content-Type: application/rss+xml; charset=utf-8');
+    echo $xml;
+    exit;
+}
+
+$cacheFile = CACHE_DIR . '/' . $channel . '.xml';
+
+// Cache hit — pre-rewritten, no DOMDocument needed
+if (file_exists($cacheFile) && filemtime($cacheFile) > time() - $ttl) {
+    header('Content-Type: application/rss+xml; charset=utf-8');
+    readfile($cacheFile);
+    exit;
+}
+
+// Cache miss or stale — fetch and rewrite in one DOMDocument pass
+$xml = fetchFeed($channel, $limit, false);
+if ($xml === null) {
+    // Serve stale cache if available
+    if (file_exists($cacheFile)) {
+        header('Content-Type: application/rss+xml; charset=utf-8');
+        readfile($cacheFile);
+        exit;
+    }
+    // No cache at all — return empty feed so bot doesn't fall back to tg.i-c-a.su
+    header('Content-Type: application/rss+xml; charset=utf-8');
+    echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"><channel><title>' . htmlspecialchars($channel) . '</title></channel></rss>';
+    exit;
+}
+
+// Save pre-rewritten XML to cache
+file_put_contents($cacheFile, $xml);
+
+header('Content-Type: application/rss+xml; charset=utf-8');
+echo $xml;
+
+
+function fetchFeed(string $channel, int $limit, bool $skipRewrite): ?string {
+    $url = TG_BASE . '/rss/' . $channel . '?limit=' . $limit;
+    $ctx = stream_context_create(['http' => ['timeout' => 30, 'user_agent' => UA, 'follow_location' => true]]);
+    $raw = @file_get_contents($url, false, $ctx);
+    if (!$raw) return null;
+
+    if ($skipRewrite) {
+        return $raw;
+    }
+
+    // Parse DOM once, rewrite enclosures, return pre-rewritten XML
+    $doc = new DOMDocument();
+    @$doc->loadXML($raw);
+    if (!$doc->documentElement) return null;
+
+    foreach ($doc->getElementsByTagName('enclosure') as $enc) {
+        $encUrl = $enc->getAttribute('url');
+        if (strpos($encUrl, TG_BASE) !== false) {
+            $enc->setAttribute('url', PROXY_BASE . '/media.php?url=' . urlencode($encUrl));
+        }
+    }
+
+    return $doc->saveXML();
+}