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/media.php
+++ b/php-proxy/media.php
@ -0,0 +1,120 @@
+<?php
+/**
+ * Telegram Media Proxy with cache
+ *
+ * GET /media.php?url=https://tg.i-c-a.su/media/CHANNEL/POSTID/HASH.ext
+ *
+ * Returns cached image or proxies from tg.i-c-a.su.
+ * Old cache files are cleaned up probabilistically (~2% of requests).
+ */
+
+define('IMG_DIR', __DIR__ . '/cache/img');
+define('TG_BASE', 'https://tg.i-c-a.su');
+define('UA', 'Mozilla/5.0 (compatible; ProxyBot/1.0)');
+define('MEDIA_TTL', 86400);
+
+$url = $_GET['url'] ?? '';
+if (!$url || strpos($url, TG_BASE) !== 0) {
+    header('HTTP/1.1 400 Bad Request');
+    echo 'Invalid URL';
+    exit;
+}
+
+if (!is_dir(IMG_DIR)) mkdir(IMG_DIR, 0755, true);
+
+// Determine cache path from URL
+$path = parse_url($url, PHP_URL_PATH);
+$basename = basename($path);
+if (!preg_match('/\.\w+$/', $basename)) {
+    $basename .= '.jpg';
+}
+$cacheFile = IMG_DIR . '/' . $basename;
+
+// Content type map
+$extToType = [
+    'jpg'  => 'image/jpeg',
+    'jpeg' => 'image/jpeg',
+    'png'  => 'image/png',
+    'gif'  => 'image/gif',
+    'webp' => 'image/webp',
+];
+$ext = strtolower(pathinfo($basename, PATHINFO_EXTENSION));
+$contentType = $extToType[$ext] ?? 'image/jpeg';
+
+// Periodic cleanup (~2% of requests)
+maybeCleanOldCache();
+
+// Serve from cache if fresh
+if (file_exists($cacheFile) && filemtime($cacheFile) > time() - MEDIA_TTL) {
+    header('Content-Type: ' . $contentType);
+    header('Content-Length: ' . filesize($cacheFile));
+    header('Cache-Control: public, max-age=' . MEDIA_TTL);
+    header('X-Cache: HIT');
+    readfile($cacheFile);
+    exit;
+}
+
+// Fetch from tg.i-c-a.su
+$ctx = stream_context_create(['http' => ['timeout' => 60, 'user_agent' => UA, 'follow_location' => true]]);
+$data = @file_get_contents($url, false, $ctx);
+
+if (!$data) {
+    header('HTTP/1.1 502 Bad Gateway');
+    echo 'Failed to fetch media';
+    exit;
+}
+
+// Verify it's actually an image before caching
+$imageSignatures = [
+    "\xff\xd8\xff",     // JPEG
+    "\x89\x50\x4e\x47", // PNG
+    "GIF87a",           // GIF
+    "GIF89a",           // GIF
+    "RIFF",             // WebP
+];
+$isImage = false;
+foreach ($imageSignatures as $sig) {
+    if (strncmp($data, $sig, strlen($sig)) === 0) {
+        $isImage = true;
+        break;
+    }
+}
+
+if (!$isImage) {
+    header('HTTP/1.1 415 Unsupported Media Type');
+    header('Content-Type: text/plain');
+    echo 'Not an image';
+    exit;
+}
+
+// Save to cache
+file_put_contents($cacheFile, $data);
+
+// Return
+header('Content-Type: ' . $contentType);
+header('Content-Length: ' . strlen($data));
+header('Cache-Control: public, max-age=' . MEDIA_TTL);
+header('X-Cache: MISS');
+echo $data;
+
+// Clean files older than TTL, runs ~2% of requests
+function maybeCleanOldCache(): void {
+    if (rand(1, 50) !== 1) return;
+    $dir = IMG_DIR;
+    if (!is_dir($dir)) return;
+    $cutoff = time() - MEDIA_TTL;
+    $imgExts = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
+    $dh = opendir($dir);
+    if (!$dh) return;
+    while (($f = readdir($dh)) !== false) {
+        if ($f === '.' || $f === '..') continue;
+        $fp = $dir . '/' . $f;
+        if (!is_file($fp)) continue;
+        $ext = strtolower(pathinfo($fp, PATHINFO_EXTENSION));
+        // Remove non-image files and files older than TTL
+        if (!in_array($ext, $imgExts) || filemtime($fp) < $cutoff) {
+            unlink($fp);
+        }
+    }
+    closedir($dh);
+}