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https://github.com/therealaleph/MasterHttpRelayVPN-RUST.git
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Euvel
657 lines
22 KiB
JavaScript
657 lines
22 KiB
JavaScript
/**
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* DomainFront Relay — Google Apps Script
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*
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* TWO modes:
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* 1. Single: POST { k, m, u, h, b, ct, r } → { s, h, b }
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* 2. Batch: POST { k, q: [{m,u,h,b,ct,r}, ...] } → { q: [{s,h,b}, ...] }
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* Uses UrlFetchApp.fetchAll() — all URLs fetched IN PARALLEL.
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*
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* OPTIONAL SPREADSHEET-BACKED RESPONSE CACHE:
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* Set CACHE_SPREADSHEET_ID to a valid Google Sheet ID (must be owned by
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* the same account). When enabled, public GET requests are stored in the
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* sheet and served from there on repeat visits, reducing UrlFetchApp
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* quota consumption. The cache is Vary-aware (Accept-Encoding and
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* Accept-Language are hashed into the compound cache key). Leave
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* CACHE_SPREADSHEET_ID as-is to disable caching entirely — zero overhead.
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*
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* DEPLOYMENT:
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* 1. Go to https://script.google.com → New project
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* 2. Delete the default code, paste THIS entire file
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* 3. Change AUTH_KEY below to your own secret
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* 4. (Optional) Set CACHE_SPREADSHEET_ID to enable caching
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* 5. Click Deploy → New deployment
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* 6. Type: Web app | Execute as: Me | Who has access: Anyone
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* 7. Copy the Deployment ID into config.json as "script_id"
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*
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* CHANGE THE AUTH KEY BELOW TO YOUR OWN SECRET!
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*/
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const AUTH_KEY = "CHANGE_ME_TO_A_STRONG_SECRET";
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// Active-probing defense. When false (production default), bad AUTH_KEY
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// requests get a decoy HTML page that looks like a placeholder Apps
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// Script web app instead of the JSON `{"e":"unauthorized"}` body. This
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// makes the deployment indistinguishable from a forgotten-but-public
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// Apps Script project to active scanners that POST malformed payloads
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// looking for proxy endpoints.
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//
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// Set to `true` during initial setup if a misconfigured client is
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// hitting "unauthorized" and you want the explicit JSON error to debug
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// — then flip back to false before the deployment is widely shared.
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// (Inspired by #365 Section 3, mhrv-rs v1.8.0+.)
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const DIAGNOSTIC_MODE = false;
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// ── Optional Spreadsheet Cache ──────────────────────────────
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// Set to a valid Spreadsheet ID to enable response caching.
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// Leave as-is to disable caching entirely (zero overhead).
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const CACHE_SPREADSHEET_ID = "CHANGE_ME_TO_CACHE_SPREADSHEET_ID";
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const CACHE_SHEET_NAME = "RelayCache";
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const CACHE_META_SHEET_NAME = "RelayMeta";
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const CACHE_META_CURSOR_CELL = "A1";
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// ── Cache Tuning ────────────────────────────────────────────
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const CACHE_MAX_ROWS = 5000; // circular buffer capacity
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const CACHE_MAX_BODY_BYTES = 35000; // skip responses larger than ~35 KB
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const CACHE_DEFAULT_TTL_SECONDS = 86400; // 24-hour fallback when no Cache-Control
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// ── Vary-Aware Cache Key ────────────────────────────────────
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// These request headers are hashed into the compound cache key
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// alongside the URL so that responses with different encodings
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// or languages never collide in the cache. Covers ~95 % of
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// real-world Vary usage without inspecting the response.
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const VARY_KEY_HEADERS = ["accept-encoding", "accept-language"];
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// Keep browser capability headers (sec-ch-ua*, sec-fetch-*) intact.
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// Some modern apps, notably Google Meet, use them for browser gating.
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const SKIP_HEADERS = {
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host: 1, connection: 1, "content-length": 1,
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"transfer-encoding": 1, "proxy-connection": 1, "proxy-authorization": 1,
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"priority": 1, te: 1,
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};
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// Headers that disqualify a request from the cache path.
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const CACHE_BUSTING_HEADERS = {
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authorization: 1, cookie: 1, "x-api-key": 1,
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"proxy-authorization": 1, "set-cookie": 1,
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};
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// HTML body for the bad-auth decoy. Mimics a minimal Apps Script-style
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// placeholder page — no proxy-shaped JSON, nothing distinctive enough
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// for a probe to fingerprint as a tunnel endpoint.
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const DECOY_HTML =
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'<!DOCTYPE html><html><head><title>Web App</title></head>' +
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'<body><p>The script completed but did not return anything.</p>' +
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'</body></html>';
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// ── Request Handlers ────────────────────────────────────────
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function _decoyOrError(jsonBody) {
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if (DIAGNOSTIC_MODE) return _json(jsonBody);
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return ContentService
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.createTextOutput(DECOY_HTML)
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.setMimeType(ContentService.MimeType.HTML);
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}
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function doPost(e) {
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try {
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var req = JSON.parse(e.postData.contents);
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if (req.k !== AUTH_KEY) return _decoyOrError({ e: "unauthorized" });
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// Batch mode: { k, q: [...] }
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if (Array.isArray(req.q)) return _doBatch(req.q);
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// Single mode
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return _doSingle(req);
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} catch (err) {
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// Parse failures of the request body are also probe-shaped — a real
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// mhrv-rs client never sends invalid JSON. Decoy for the same reason.
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return _decoyOrError({ e: String(err) });
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}
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}
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// `doGet` is what active scanners hit first (HTTP GET probes are cheaper
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// than POSTs). Apps Script defaults to a "Script function not found" page
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// here which is a fine-enough decoy on its own, but explicitly returning
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// the same harmless placeholder makes the response identical to the
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// bad-auth POST decoy — one less fingerprint vector.
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function doGet(e) {
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return ContentService
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.createTextOutput(DECOY_HTML)
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.setMimeType(ContentService.MimeType.HTML);
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}
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// ── Single Request ─────────────────────────────────────────
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function _doSingle(req) {
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if (!req.u || typeof req.u !== "string" || !req.u.match(/^https?:\/\//i)) {
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return _json({ e: "bad url" });
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}
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// ── Optional cache path ────────────────────────────────
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// Only entered when CACHE_SPREADSHEET_ID is configured and
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// the request qualifies as a public, cachable GET.
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if (_canUseCache(req)) {
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var cached = _getFromCache(req.u, req.h);
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if (cached) {
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return _json({
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s: cached.status,
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h: JSON.parse(cached.headers),
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b: cached.body,
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cached: true,
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});
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}
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var fetchResult = _fetchAndCache(req.u, req.h);
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if (fetchResult) {
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return _json({
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s: fetchResult.status,
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h: JSON.parse(fetchResult.headers),
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b: fetchResult.body,
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cached: false,
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});
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}
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// If _fetchAndCache returns null (spreadsheet unavailable),
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// fall through to the normal relay path below.
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}
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// ── Normal relay (cache disabled or unavailable) ────────
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var opts = _buildOpts(req);
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var resp = UrlFetchApp.fetch(req.u, opts);
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return _json({
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s: resp.getResponseCode(),
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h: _respHeaders(resp),
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b: Utilities.base64Encode(resp.getContent()),
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});
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}
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// ── Batch Request ──────────────────────────────────────────
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function _doBatch(items) {
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var fetchArgs = [];
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var errorMap = {};
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for (var i = 0; i < items.length; i++) {
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var item = items[i];
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if (!item.u || typeof item.u !== "string" || !item.u.match(/^https?:\/\//i)) {
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errorMap[i] = "bad url";
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continue;
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}
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var opts = _buildOpts(item);
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opts.url = item.u;
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fetchArgs.push({ _i: i, _o: opts });
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}
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// fetchAll() processes all requests in parallel inside Google
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var responses = [];
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if (fetchArgs.length > 0) {
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responses = UrlFetchApp.fetchAll(fetchArgs.map(function(x) { return x._o; }));
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}
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var results = [];
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var rIdx = 0;
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for (var i = 0; i < items.length; i++) {
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if (errorMap.hasOwnProperty(i)) {
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results.push({ e: errorMap[i] });
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} else {
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var resp = responses[rIdx++];
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results.push({
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s: resp.getResponseCode(),
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h: _respHeaders(resp),
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b: Utilities.base64Encode(resp.getContent()),
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});
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}
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}
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return _json({ q: results });
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}
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// ── Request Building ───────────────────────────────────────
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function _buildOpts(req) {
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var opts = {
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method: (req.m || "GET").toLowerCase(),
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muteHttpExceptions: true,
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followRedirects: req.r !== false,
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validateHttpsCertificates: true,
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escaping: false,
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};
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if (req.h && typeof req.h === "object") {
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var headers = {};
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for (var k in req.h) {
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if (req.h.hasOwnProperty(k) && !SKIP_HEADERS[k.toLowerCase()]) {
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headers[k] = req.h[k];
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}
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}
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opts.headers = headers;
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}
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if (req.b) {
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opts.payload = Utilities.base64Decode(req.b);
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if (req.ct) opts.contentType = req.ct;
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}
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return opts;
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}
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function _respHeaders(resp) {
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try {
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if (typeof resp.getAllHeaders === "function") {
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return resp.getAllHeaders();
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}
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} catch (err) {}
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return resp.getHeaders();
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}
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function doGet(e) {
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return HtmlService.createHtmlOutput(
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"<!DOCTYPE html><html><head><title>My App</title></head>" +
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'<body style="font-family:sans-serif;max-width:600px;margin:40px auto">' +
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"<h1>Welcome</h1><p>This application is running normally.</p>" +
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"</body></html>"
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);
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}
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function _json(obj) {
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return ContentService.createTextOutput(JSON.stringify(obj)).setMimeType(
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ContentService.MimeType.JSON
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);
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}
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// ═══════════════════════════════════════════════════════════
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// SPREADSHEET CACHE — SHEET MANAGEMENT
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// ═══════════════════════════════════════════════════════════
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function _initCacheSheet() {
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if (CACHE_SPREADSHEET_ID === "CHANGE_ME_TO_CACHE_SPREADSHEET_ID") {
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return null;
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}
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try {
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var ss = SpreadsheetApp.openById(CACHE_SPREADSHEET_ID);
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var sheet = ss.getSheetByName(CACHE_SHEET_NAME);
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if (!sheet) {
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sheet = ss.insertSheet(CACHE_SHEET_NAME);
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// Schema: URL_Hash | URL | Status | Headers | Body | Timestamp | Expires_At
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sheet.getRange(1, 1, 1, 7).setValues([[
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"URL_Hash", "URL", "Status", "Headers", "Body", "Timestamp", "Expires_At"
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]]);
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}
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return sheet;
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} catch (e) {
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return null;
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}
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}
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function _getMetaSheet() {
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if (CACHE_SPREADSHEET_ID === "CHANGE_ME_TO_CACHE_SPREADSHEET_ID") {
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return null;
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}
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try {
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var ss = SpreadsheetApp.openById(CACHE_SPREADSHEET_ID);
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var sheet = ss.getSheetByName(CACHE_META_SHEET_NAME);
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if (!sheet) {
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sheet = ss.insertSheet(CACHE_META_SHEET_NAME);
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sheet.getRange(CACHE_META_CURSOR_CELL).setValue(2);
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sheet.hideSheet();
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}
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return sheet;
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} catch (e) {
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return null;
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}
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}
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function _getNextCursor(sheet, metaSheet) {
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var cursorRange = metaSheet.getRange(CACHE_META_CURSOR_CELL);
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var cursor = cursorRange.getValue();
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if (typeof cursor !== "number" || cursor < 2) cursor = 2;
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var totalRows = sheet.getDataRange().getNumRows();
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if (totalRows < CACHE_MAX_ROWS + 1) {
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return totalRows + 1;
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}
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return cursor;
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}
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function _advanceCursor(metaSheet, currentRow) {
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var nextRow = currentRow + 1;
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if (nextRow > CACHE_MAX_ROWS + 1) nextRow = 2;
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metaSheet.getRange(CACHE_META_CURSOR_CELL).setValue(nextRow);
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}
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function _ensureRowsAllocated(sheet) {
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var totalRows = sheet.getDataRange().getNumRows();
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if (totalRows < CACHE_MAX_ROWS + 1) {
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var needed = CACHE_MAX_ROWS + 1 - totalRows;
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sheet.insertRowsAfter(totalRows, needed);
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}
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}
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// ═══════════════════════════════════════════════════════════
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// SPREADSHEET CACHE — VARY-AWARE COMPOUND KEY
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// ═══════════════════════════════════════════════════════════
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/**
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* Case-insensitive header lookup.
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* HTTP header names are case-insensitive per RFC 7230 § 3.2.
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*/
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function _getHeaderCaseInsensitive(headers, targetKey) {
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var target = targetKey.toLowerCase();
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for (var k in headers) {
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if (headers.hasOwnProperty(k) && k.toLowerCase() === target) {
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return headers[k];
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}
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}
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return null;
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}
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/**
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* Compute a compound cache key:
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* MD5(URL | header1:value1 | header2:value2 | ...)
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*
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* Instead of reading the response Vary header (which would require
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* fetching first — circular), we preemptively include the request
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* headers that are known to cause response variation. This handles
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* Vary: Accept-Encoding and Vary: Accept-Language without ever
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* inspecting the response.
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*
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* Values are lowercased and whitespace-stripped so semantically
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* identical requests from different clients produce the same hash.
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* Missing and empty headers both map to "<none>" (same semantic).
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*/
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function _getCacheKey(url, reqHeaders) {
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var parts = [url];
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if (reqHeaders && typeof reqHeaders === "object") {
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for (var i = 0; i < VARY_KEY_HEADERS.length; i++) {
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var headerName = VARY_KEY_HEADERS[i];
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var rawValue = _getHeaderCaseInsensitive(reqHeaders, headerName);
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if (rawValue && String(rawValue).trim() !== "") {
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parts.push(headerName + ":" + rawValue.toLowerCase().replace(/\s/g, ""));
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} else {
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parts.push(headerName + ":<none>");
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}
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}
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} else {
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for (var j = 0; j < VARY_KEY_HEADERS.length; j++) {
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parts.push(VARY_KEY_HEADERS[j] + ":<none>");
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}
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}
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var compoundKey = parts.join("|");
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return _md5Hex(compoundKey);
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}
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function _md5Hex(input) {
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var rawHash = Utilities.computeDigest(Utilities.DigestAlgorithm.MD5, input);
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return rawHash
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.map(function (byte) {
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var v = (byte < 0) ? 256 + byte : byte;
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return ("0" + v.toString(16)).slice(-2);
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})
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.join("");
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}
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// ═══════════════════════════════════════════════════════════
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// SPREADSHEET CACHE — CORE LOGIC
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// ═══════════════════════════════════════════════════════════
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/**
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* Returns true if the request is eligible for the cache path:
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* public GET, no body, no auth/cookie headers, cache configured.
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*/
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function _canUseCache(req) {
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if ((req.m || "GET") !== "GET") return false;
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if (req.b) return false;
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if (!req.u || !req.u.match(/^https?:\/\//i)) return false;
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if (CACHE_SPREADSHEET_ID === "CHANGE_ME_TO_CACHE_SPREADSHEET_ID") return false;
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if (req.h && typeof req.h === "object") {
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for (var k in req.h) {
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if (req.h.hasOwnProperty(k) && CACHE_BUSTING_HEADERS[k.toLowerCase()]) {
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return false;
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}
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}
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}
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return true;
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}
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/**
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* Extract max-age (seconds) from a Cache-Control header value.
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* Returns 0 if the directive forbids caching (no-cache / no-store /
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* private). Falls back to CACHE_DEFAULT_TTL_SECONDS when no header
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* is present. Clamped to [60, 2592000] (1 min – 30 days).
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*/
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function _parseMaxAge(cacheControlHeader) {
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if (!cacheControlHeader) return CACHE_DEFAULT_TTL_SECONDS;
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var lower = cacheControlHeader.toLowerCase();
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if (
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lower.indexOf("no-cache") !== -1 ||
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lower.indexOf("no-store") !== -1 ||
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lower.indexOf("private") !== -1
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) {
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return 0;
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}
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var match = lower.match(/max-age=(\d+)/);
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if (match) {
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var ttl = parseInt(match[1], 10);
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return Math.max(60, Math.min(ttl, 2592000));
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}
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return CACHE_DEFAULT_TTL_SECONDS;
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}
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/**
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* Rewrite time-sensitive headers so the client sees accurate
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* Date, Age, and Cache-Control values reflecting cache age.
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*/
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function _refreshCachedHeaders(headersJson, timestamp) {
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var headers = JSON.parse(headersJson);
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var cachedAt = new Date(timestamp);
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var now = new Date();
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var ageSeconds = Math.floor((now.getTime() - cachedAt.getTime()) / 1000);
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if (ageSeconds < 0) ageSeconds = 0;
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headers["Date"] = now.toUTCString();
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headers["Age"] = String(ageSeconds);
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var originalCc = headers["Cache-Control"] || headers["cache-control"];
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if (originalCc) {
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headers["X-Original-Cache-Control"] = originalCc;
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}
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var remainingMaxAge = Math.max(0, _parseMaxAge(originalCc) - ageSeconds);
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headers["Cache-Control"] = "public, max-age=" + remainingMaxAge;
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headers["X-Cache"] = "HIT from relay-spreadsheet";
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headers["X-Cached-At"] = cachedAt.toUTCString();
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return JSON.stringify(headers);
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}
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/**
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* Retrieve a cached response by compound cache key.
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* Uses TextFinder for O(log n) lookup. Skips expired entries.
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* Returns null on miss, expired entry, or unavailable sheet.
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*/
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function _getFromCache(url, reqHeaders) {
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var sheet = _initCacheSheet();
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if (!sheet) return null;
|
||
|
||
var hash = _getCacheKey(url, reqHeaders);
|
||
var finder = sheet.createTextFinder(hash).matchEntireCell(true);
|
||
var found = finder.findNext();
|
||
|
||
if (found) {
|
||
var row = sheet.getRange(found.getRow(), 1, 1, 7).getValues()[0];
|
||
|
||
var expiresAt = row[6];
|
||
if (expiresAt && expiresAt instanceof Date && expiresAt < new Date()) {
|
||
return null;
|
||
}
|
||
|
||
return {
|
||
status: row[2],
|
||
headers: _refreshCachedHeaders(row[3], row[5]),
|
||
body: row[4],
|
||
};
|
||
}
|
||
return null;
|
||
}
|
||
|
||
/**
|
||
* Fetch a URL and store the response in the spreadsheet cache
|
||
* using a circular buffer (O(1) writes). Skips storage when the
|
||
* encoded body exceeds CACHE_MAX_BODY_BYTES or when Cache-Control
|
||
* forbids caching. Returns the fetch result regardless.
|
||
*/
|
||
function _fetchAndCache(url, reqHeaders) {
|
||
var sheet = _initCacheSheet();
|
||
if (!sheet) return null;
|
||
|
||
try {
|
||
var response = UrlFetchApp.fetch(url, { muteHttpExceptions: true });
|
||
var status = response.getResponseCode();
|
||
var headers = _respHeaders(response);
|
||
var body = Utilities.base64Encode(response.getContent());
|
||
|
||
// Cell-size safety gate
|
||
if (body.length > CACHE_MAX_BODY_BYTES) {
|
||
return { status: status, headers: JSON.stringify(headers), body: body };
|
||
}
|
||
|
||
// TTL extraction
|
||
var cacheControl =
|
||
headers["Cache-Control"] || headers["cache-control"] || null;
|
||
var ttlSeconds = _parseMaxAge(cacheControl);
|
||
|
||
if (ttlSeconds === 0) {
|
||
return { status: status, headers: JSON.stringify(headers), body: body };
|
||
}
|
||
|
||
var hash = _getCacheKey(url, reqHeaders);
|
||
var timestamp = new Date();
|
||
var expiresAt = new Date(timestamp.getTime() + ttlSeconds * 1000);
|
||
|
||
// Safety: fallback if Date math produces invalid result
|
||
if (isNaN(expiresAt.getTime())) {
|
||
expiresAt = new Date(timestamp.getTime() + CACHE_DEFAULT_TTL_SECONDS * 1000);
|
||
}
|
||
|
||
var rowData = [
|
||
hash,
|
||
url,
|
||
status,
|
||
JSON.stringify(headers),
|
||
body,
|
||
timestamp.toISOString(),
|
||
expiresAt,
|
||
];
|
||
|
||
// Circular buffer write (O(1))
|
||
var metaSheet = _getMetaSheet();
|
||
if (metaSheet) {
|
||
_ensureRowsAllocated(sheet);
|
||
var writeRow = _getNextCursor(sheet, metaSheet);
|
||
sheet.getRange(writeRow, 1, 1, 7).setValues([rowData]);
|
||
_advanceCursor(metaSheet, writeRow);
|
||
} else {
|
||
// Fallback: simple append if meta sheet is unavailable
|
||
sheet.appendRow(rowData);
|
||
}
|
||
|
||
return { status: status, headers: JSON.stringify(headers), body: body };
|
||
} catch (e) {
|
||
return null;
|
||
}
|
||
}
|
||
|
||
// ═══════════════════════════════════════════════════════════
|
||
// SPREADSHEET CACHE — DIAGNOSTICS
|
||
// ═══════════════════════════════════════════════════════════
|
||
|
||
function getCacheStats() {
|
||
var sheet = _initCacheSheet();
|
||
if (!sheet) {
|
||
console.log("Cache is not enabled or spreadsheet unavailable.");
|
||
return;
|
||
}
|
||
|
||
var data = sheet.getDataRange().getValues();
|
||
var totalEntries = data.length - 1;
|
||
var now = new Date();
|
||
var expiredCount = 0;
|
||
|
||
for (var i = 1; i < data.length; i++) {
|
||
var expiresAt = data[i][6];
|
||
if (expiresAt && expiresAt instanceof Date && expiresAt < now) {
|
||
expiredCount++;
|
||
}
|
||
}
|
||
|
||
var metaSheet = _getMetaSheet();
|
||
var cursorInfo = "N/A";
|
||
if (metaSheet) {
|
||
cursorInfo = String(metaSheet.getRange(CACHE_META_CURSOR_CELL).getValue());
|
||
}
|
||
|
||
console.log("=== CACHE STATS ===");
|
||
console.log("Total rows used: " + totalEntries + " / " + CACHE_MAX_ROWS);
|
||
console.log("Active entries: " + (totalEntries - expiredCount));
|
||
console.log("Expired entries: " + expiredCount);
|
||
console.log("Cursor position: " + cursorInfo);
|
||
console.log("Max body size: " + CACHE_MAX_BODY_BYTES + " chars");
|
||
console.log("Default TTL: " + CACHE_DEFAULT_TTL_SECONDS + " sec");
|
||
console.log("Vary key headers: " + VARY_KEY_HEADERS.join(", "));
|
||
if (totalEntries > 0) {
|
||
console.log("Oldest entry: " + data[1][5]);
|
||
console.log("Newest entry: " + data[data.length - 1][5]);
|
||
}
|
||
}
|
||
|
||
function clearExpiredCache() {
|
||
var sheet = _initCacheSheet();
|
||
if (!sheet) {
|
||
console.log("Cache is not enabled.");
|
||
return;
|
||
}
|
||
|
||
var data = sheet.getDataRange().getValues();
|
||
var now = new Date();
|
||
var rowsToClear = [];
|
||
|
||
for (var i = 1; i < data.length; i++) {
|
||
var expiresAt = data[i][6];
|
||
if (expiresAt && expiresAt instanceof Date && expiresAt < now) {
|
||
rowsToClear.push(i + 1);
|
||
}
|
||
}
|
||
|
||
for (var j = 0; j < rowsToClear.length; j++) {
|
||
sheet.getRange(rowsToClear[j], 1, 1, 7).clearContent();
|
||
}
|
||
|
||
console.log("Cleared " + rowsToClear.length + " expired entries (" +
|
||
(data.length - 1 - rowsToClear.length) + " remaining).");
|
||
}
|
||
|
||
function clearEntireCache() {
|
||
var sheet = _initCacheSheet();
|
||
if (sheet) {
|
||
var totalRows = sheet.getDataRange().getNumRows();
|
||
if (totalRows > 1) {
|
||
sheet.getRange(2, 1, totalRows - 1, 7).clearContent();
|
||
}
|
||
}
|
||
|
||
var metaSheet = _getMetaSheet();
|
||
if (metaSheet) {
|
||
metaSheet.getRange(CACHE_META_CURSOR_CELL).setValue(2);
|
||
}
|
||
|
||
console.log("Cache wiped. Cursor reset to row 2.");
|
||
}
|