Replace media proxy with cPanel-compatible PHP implementation
This commit is contained in:
Jage9
@@ -1,25 +1,40 @@
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<?php
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/**
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* Lightweight audio/media proxy for Chat Grid radio streams.
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/*
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* Chat Grid media proxy (compat-focused).
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*
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* Usage:
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* /chgrid/media_proxy.php?url=<urlencoded-remote-stream-url>
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* /chgrid/media_proxy.php?url=<urlencoded-remote-url>
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*
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* Notes:
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* - Supports upstream http/https URLs.
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* - Intended for same-origin browser playback to avoid client-side CORS limits.
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* - Includes simple SSRF protections (scheme checks + private/reserved IP blocking).
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* - Optional host allowlist via env CHGRID_MEDIA_PROXY_ALLOWLIST, comma-separated.
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* Goals:
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* - Works on older cPanel PHP web handlers.
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* - Supports http/https upstreams.
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* - Provides same-origin endpoint for browser playback.
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*/
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header('Access-Control-Allow-Origin: *');
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header('Access-Control-Allow-Methods: GET, HEAD, OPTIONS');
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header('Access-Control-Allow-Headers: Range');
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function set_status($code)
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{
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$map = array(
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200 => 'OK',
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204 => 'No Content',
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400 => 'Bad Request',
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403 => 'Forbidden',
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405 => 'Method Not Allowed',
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500 => 'Internal Server Error',
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502 => 'Bad Gateway'
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);
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$text = isset($map[$code]) ? $map[$code] : 'OK';
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header('HTTP/1.1 ' . (int) $code . ' ' . $text);
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}
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function send_text($code, $message)
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{
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set_status($code);
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header('Content-Type: text/plain; charset=utf-8');
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echo $message . "\n";
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exit;
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}
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/**
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* PHP-version-safe suffix check (avoid str_ends_with dependency).
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*/
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function host_matches_suffix($host, $suffix)
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{
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if ($suffix === '') {
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@@ -35,67 +50,46 @@ function host_matches_suffix($host, $suffix)
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return substr($host, -strlen($needle)) === $needle;
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}
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if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
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http_response_code(204);
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header('Access-Control-Allow-Origin: *');
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header('Access-Control-Allow-Methods: GET, HEAD, OPTIONS');
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header('Access-Control-Allow-Headers: Range');
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$method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';
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if ($method === 'OPTIONS') {
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set_status(204);
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exit;
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}
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if (!in_array($_SERVER['REQUEST_METHOD'], ['GET', 'HEAD'], true)) {
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http_response_code(405);
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header('Content-Type: text/plain; charset=utf-8');
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echo "method not allowed\n";
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exit;
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if ($method !== 'GET' && $method !== 'HEAD') {
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send_text(405, 'method not allowed');
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}
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$rawUrl = isset($_GET['url']) ? trim((string) $_GET['url']) : '';
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if ($rawUrl === '') {
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http_response_code(400);
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header('Content-Type: text/plain; charset=utf-8');
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echo "missing url query param\n";
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exit;
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send_text(400, 'missing url query param');
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}
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$parsed = parse_url($rawUrl);
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if ($parsed === false || !isset($parsed['scheme'], $parsed['host'])) {
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http_response_code(400);
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header('Content-Type: text/plain; charset=utf-8');
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echo "invalid url\n";
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exit;
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if ($parsed === false || !isset($parsed['scheme']) || !isset($parsed['host'])) {
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send_text(400, 'invalid url');
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}
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$scheme = strtolower((string) $parsed['scheme']);
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if ($scheme !== 'http' && $scheme !== 'https') {
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http_response_code(400);
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header('Content-Type: text/plain; charset=utf-8');
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echo "unsupported scheme\n";
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exit;
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send_text(400, 'unsupported scheme');
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}
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$host = strtolower((string) $parsed['host']);
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if ($host === 'localhost' || $host === '127.0.0.1' || $host === '::1') {
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http_response_code(403);
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header('Content-Type: text/plain; charset=utf-8');
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echo "forbidden host\n";
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exit;
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send_text(403, 'forbidden host');
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}
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/**
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* Optional host allowlist, comma-separated suffixes.
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* Example:
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* CHGRID_MEDIA_PROXY_ALLOWLIST=dropbox.com,dropboxusercontent.com,stream0.wfmu.org
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*/
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// Optional allowlist env var: CHGRID_MEDIA_PROXY_ALLOWLIST=dropbox.com,example.com
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$allowlistEnv = getenv('CHGRID_MEDIA_PROXY_ALLOWLIST');
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if ($allowlistEnv !== false && trim($allowlistEnv) !== '') {
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$allowlist = array();
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$rawAllowlist = explode(',', (string) $allowlistEnv);
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foreach ($rawAllowlist as $entry) {
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$normalized = strtolower(trim((string) $entry));
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if ($normalized !== '') {
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$allowlist[] = $normalized;
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}
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}
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$allowed = false;
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foreach ($allowlist as $suffix) {
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$parts = explode(',', (string) $allowlistEnv);
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foreach ($parts as $part) {
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$suffix = strtolower(trim((string) $part));
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if ($suffix === '') {
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continue;
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}
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@@ -105,159 +99,117 @@ if ($allowlistEnv !== false && trim($allowlistEnv) !== '') {
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}
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}
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if (!$allowed) {
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http_response_code(403);
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header('Content-Type: text/plain; charset=utf-8');
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echo "host not allowed\n";
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exit;
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send_text(403, 'host not allowed');
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}
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}
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// Resolve and block private/reserved targets (basic SSRF guard).
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// Basic SSRF guard for IPv4.
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$resolved = @gethostbynamel($host);
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if ($resolved === false || count($resolved) === 0) {
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http_response_code(502);
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header('Content-Type: text/plain; charset=utf-8');
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echo "dns resolution failed\n";
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exit;
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send_text(502, 'dns resolution failed');
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}
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foreach ($resolved as $ip) {
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$ok = filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE);
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if ($ok === false) {
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http_response_code(403);
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header('Content-Type: text/plain; charset=utf-8');
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echo "resolved ip not allowed\n";
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exit;
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send_text(403, 'resolved ip not allowed');
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}
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}
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if (!function_exists('curl_init')) {
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http_response_code(500);
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header('Content-Type: text/plain; charset=utf-8');
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echo "curl extension is required\n";
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exit;
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send_text(500, 'curl extension is required');
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}
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$ch = curl_init($rawUrl);
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if ($ch === false) {
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http_response_code(500);
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header('Content-Type: text/plain; charset=utf-8');
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echo "proxy init failed\n";
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exit;
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$ch = curl_init();
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if (!$ch) {
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send_text(500, 'proxy init failed');
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}
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$upstreamHeaders = [];
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$statusCode = 200;
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$sentContentType = false;
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$headersSent = false;
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curl_setopt_array($ch, [
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CURLOPT_FOLLOWLOCATION => true,
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CURLOPT_MAXREDIRS => 5,
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CURLOPT_CONNECTTIMEOUT => 10,
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CURLOPT_TIMEOUT => 30,
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CURLOPT_HTTPGET => true,
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CURLOPT_RETURNTRANSFER => false,
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CURLOPT_HEADER => false,
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CURLOPT_NOSIGNAL => true,
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CURLOPT_USERAGENT => 'ChatGridMediaProxy/1.0',
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CURLOPT_HTTPHEADER => [
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'Accept: */*',
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'Connection: keep-alive',
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],
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CURLOPT_HEADERFUNCTION => function ($curl, $headerLine) use (&$upstreamHeaders, &$statusCode, &$sentContentType) {
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$trimmed = trim($headerLine);
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$length = strlen($headerLine);
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if ($trimmed === '') {
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return $length;
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}
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if (stripos($trimmed, 'HTTP/') === 0) {
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$parts = explode(' ', $trimmed);
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if (isset($parts[1]) && ctype_digit($parts[1])) {
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$statusCode = (int) $parts[1];
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}
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return $length;
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}
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$split = explode(':', $trimmed, 2);
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if (count($split) !== 2) {
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return $length;
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}
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$name = strtolower(trim($split[0]));
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$value = trim($split[1]);
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$upstreamHeaders[$name] = $value;
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if ($name === 'content-type') {
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$sentContentType = true;
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}
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return $length;
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},
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]);
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if (isset($_SERVER['HTTP_RANGE']) && $_SERVER['HTTP_RANGE'] !== '') {
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curl_setopt($ch, CURLOPT_RANGE, (string) $_SERVER['HTTP_RANGE']);
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$requestHeaders = array('Accept: */*', 'Connection: keep-alive');
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$range = isset($_SERVER['HTTP_RANGE']) ? trim((string) $_SERVER['HTTP_RANGE']) : '';
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if ($range !== '') {
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$requestHeaders[] = 'Range: ' . $range;
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}
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if ($_SERVER['REQUEST_METHOD'] === 'HEAD') {
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curl_setopt($ch, CURLOPT_URL, $rawUrl);
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curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
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curl_setopt($ch, CURLOPT_MAXREDIRS, 5);
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curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
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curl_setopt($ch, CURLOPT_TIMEOUT, 45);
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curl_setopt($ch, CURLOPT_HEADER, true);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($ch, CURLOPT_NOSIGNAL, true);
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curl_setopt($ch, CURLOPT_USERAGENT, 'ChatGridMediaProxy/1.0');
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curl_setopt($ch, CURLOPT_HTTPHEADER, $requestHeaders);
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if ($method === 'HEAD') {
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curl_setopt($ch, CURLOPT_NOBODY, true);
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}
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/**
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* Emit downstream headers exactly once (before body bytes).
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*/
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$emitHeaders = function () use (&$headersSent, &$statusCode, &$upstreamHeaders, &$sentContentType, $ch) {
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if ($headersSent) {
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return;
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}
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if ($statusCode < 200 || $statusCode >= 600) {
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$statusCode = (int) curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
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if ($statusCode < 200 || $statusCode >= 600) {
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$statusCode = 200;
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}
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}
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http_response_code($statusCode);
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if ($sentContentType && isset($upstreamHeaders['content-type'])) {
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header('Content-Type: ' . $upstreamHeaders['content-type']);
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} else {
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header('Content-Type: application/octet-stream');
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}
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if (isset($upstreamHeaders['content-length'])) {
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header('Content-Length: ' . $upstreamHeaders['content-length']);
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}
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if (isset($upstreamHeaders['accept-ranges'])) {
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header('Accept-Ranges: ' . $upstreamHeaders['accept-ranges']);
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}
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if (isset($upstreamHeaders['content-range'])) {
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header('Content-Range: ' . $upstreamHeaders['content-range']);
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}
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if (isset($upstreamHeaders['cache-control'])) {
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header('Cache-Control: ' . $upstreamHeaders['cache-control']);
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} else {
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header('Cache-Control: no-store');
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}
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$headersSent = true;
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};
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// Stream output incrementally.
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curl_setopt($ch, CURLOPT_WRITEFUNCTION, function ($curl, $chunk) use ($emitHeaders) {
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$emitHeaders();
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$len = strlen($chunk);
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if ($len > 0) {
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echo $chunk;
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flush();
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}
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return $len;
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});
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$ok = curl_exec($ch);
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if ($ok === false) {
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$response = curl_exec($ch);
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if ($response === false) {
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$err = curl_error($ch);
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curl_close($ch);
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http_response_code(502);
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header('Content-Type: text/plain; charset=utf-8');
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echo "upstream fetch failed: " . $err . "\n";
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exit;
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send_text(502, 'upstream fetch failed: ' . $err);
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}
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$emitHeaders();
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$status = (int) curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
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if ($status < 100 || $status > 599) {
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$status = 200;
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}
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$headerSize = (int) curl_getinfo($ch, CURLINFO_HEADER_SIZE);
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curl_close($ch);
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$rawHeaders = substr($response, 0, $headerSize);
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$body = substr($response, $headerSize);
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$headerBlocks = preg_split("/\r\n\r\n|\n\n/", trim($rawHeaders));
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$lastHeaderBlock = '';
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if (is_array($headerBlocks) && count($headerBlocks) > 0) {
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$lastHeaderBlock = $headerBlocks[count($headerBlocks) - 1];
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}
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set_status($status);
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$contentType = '';
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$contentLength = '';
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$acceptRanges = '';
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$contentRange = '';
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$cacheControl = '';
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$lines = preg_split("/\r\n|\n/", $lastHeaderBlock);
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if (is_array($lines)) {
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foreach ($lines as $line) {
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$line = trim($line);
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if ($line === '' || stripos($line, 'HTTP/') === 0) {
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continue;
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}
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$split = explode(':', $line, 2);
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if (count($split) !== 2) {
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continue;
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}
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$name = strtolower(trim($split[0]));
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$value = trim($split[1]);
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if ($name === 'content-type') $contentType = $value;
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if ($name === 'content-length') $contentLength = $value;
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if ($name === 'accept-ranges') $acceptRanges = $value;
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if ($name === 'content-range') $contentRange = $value;
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if ($name === 'cache-control') $cacheControl = $value;
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}
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}
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if ($contentType !== '') {
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header('Content-Type: ' . $contentType);
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} else {
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header('Content-Type: application/octet-stream');
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}
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if ($contentLength !== '') header('Content-Length: ' . $contentLength);
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if ($acceptRanges !== '') header('Accept-Ranges: ' . $acceptRanges);
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if ($contentRange !== '') header('Content-Range: ' . $contentRange);
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if ($cacheControl !== '') {
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header('Cache-Control: ' . $cacheControl);
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} else {
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header('Cache-Control: no-store');
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}
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if ($method !== 'HEAD') {
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echo $body;
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}
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Block a user