407 lines
14 KiB
TypeScript
407 lines
14 KiB
TypeScript
/**
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* HTTP + WebSocket server bootstrap for remote-control.
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*
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* Responsible for:
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* - Creating and configuring the HTTP server (middleware, TLS in future T-1.3)
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* - Wiring up the WebSocket upgrade handler (see upgrade.ts)
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* - Serving LEGACY routes for the browser HTML client (html.ts)
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* - Managing the connected-client set and the broadcast helper
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* - Returning a RemoteServer handle to the extension entry point (index.ts)
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*
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* LEGACY routes (kept until Phase 2 ships and html.ts is retired):
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* GET / — serves the browser HTML UI (buildHTML from html.ts)
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* GET /index.html — same as /
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* GET /manifest.json — PWA manifest
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* GET /icon.svg — PWA icon
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* WS /ws — WebSocket endpoint for the browser client
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*
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* Future route modules live under routes/ and are wired here once they
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* land in T-1.5, T-1.6, T-1.7.
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*/
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import { randomBytes } from "node:crypto";
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import type { IncomingMessage } from "node:http";
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import { createServer } from "node:http";
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import { createRequire } from "node:module";
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import type { AddressInfo } from "node:net";
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import type {
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ExtensionAPI,
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ExtensionContext,
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} from "@earendil-works/pi-coding-agent";
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import { validateBearer } from "../auth/tokens.js";
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import {
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generateSessionId,
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loadOrCreateToken,
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parseCookies,
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SESSION_COOKIE,
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validateToken,
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} from "../auth.js";
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import { parseBindAddress, readRemoteControlConfig } from "../config.js";
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import { buildHTML } from "../html.js"; // LEGACY: browser HTML client
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import { buildSyncMessage } from "../messages.js";
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import { handleCommands } from "./routes/commands.js";
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import { handleHealth } from "./routes/health.js";
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import { handleInput } from "./routes/input.js";
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import { handleSessions } from "./routes/sessions.js";
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import type { RemoteServer, WsClient, WsServer } from "./types.js";
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import { createUpgradeHandler } from "./upgrade.js";
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import { extractBearer } from "./util.js";
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// ---------------------------------------------------------------------------
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// Load ws (bundled with pi) without needing @types/ws installed locally
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// ---------------------------------------------------------------------------
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const _require = createRequire(import.meta.url);
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const wsModule = _require("ws") as {
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WebSocketServer: new (opts: { noServer: boolean }) => WsServer;
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OPEN: number;
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};
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const { WebSocketServer, OPEN } = wsModule;
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// ---------------------------------------------------------------------------
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// startServer
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// ---------------------------------------------------------------------------
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export async function startServer(
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pi: ExtensionAPI,
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ctx: ExtensionContext,
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): Promise<RemoteServer> {
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const config = await readRemoteControlConfig();
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const bindAddr = config.bindAddress ?? "";
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const { host: bindHost, port: bindPort } = bindAddr
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? parseBindAddress(bindAddr)
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: { host: "127.0.0.1", port: 0 };
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const clientChangeListeners: Array<() => void> = [];
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const clients = new Set<WsClient>();
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const token = await loadOrCreateToken();
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// Map of valid session IDs → expiry timestamp (ms since epoch)
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const SESSION_TTL_MS = 86_400_000; // 24 h — matches cookie Max-Age
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const validSessions = new Map<string, number>();
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const pruneExpiredSessions = (): void => {
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const now = Date.now();
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for (const [id, expiresAt] of validSessions) {
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if (expiresAt <= now) validSessions.delete(id);
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}
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};
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/** Check if a request is authenticated (valid token query param OR valid session cookie) */
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function isAuthenticated(req: IncomingMessage): boolean {
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// Check session cookie first
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const cookies = parseCookies(req.headers.cookie);
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const sessionId = cookies[SESSION_COOKIE];
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const sessionExpiry = sessionId ? validSessions.get(sessionId) : undefined;
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if (sessionExpiry !== undefined && sessionExpiry > Date.now()) return true;
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// Check token query param
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const url = new URL(req.url ?? "/", "http://localhost");
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const providedToken = url.searchParams.get("token");
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if (providedToken && validateToken(providedToken, token)) return true;
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return false;
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}
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function broadcast(msg: object): void {
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const data = JSON.stringify(msg);
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for (const client of clients) {
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if (client.readyState === OPEN) {
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try {
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client.send(data);
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} catch {
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/* ignore */
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}
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}
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}
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}
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function sync(currentCtx: ExtensionContext): void {
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broadcast(buildSyncMessage(currentCtx));
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}
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// ── HTTP server ─────────────────────────────────────────────────────────
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const httpServer = createServer((req, res) => {
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const url = new URL(req.url ?? "/", "http://localhost");
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const pathname = url.pathname;
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// LEGACY: PWA manifest — served for the browser HTML client
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if (pathname === "/manifest.json") {
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res.writeHead(200, {
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"Content-Type": "application/manifest+json; charset=utf-8",
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});
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res.end(
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JSON.stringify({
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name: "Pi Remote",
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short_name: "Pi",
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description: "Remote control for Pi sessions",
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start_url: "/",
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display: "standalone",
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background_color: "#0d1117",
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theme_color: "#0d1117",
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icons: [{ src: "/icon.svg", sizes: "any", type: "image/svg+xml" }],
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}),
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);
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return;
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}
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// LEGACY: PWA icon — served for the browser HTML client
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if (pathname === "/icon.svg") {
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res.writeHead(200, {
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"Content-Type": "image/svg+xml",
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"Cache-Control": "public, max-age=86400",
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});
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res.end(
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`<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 180 180"><rect width="180" height="180" rx="40" fill="#0d1117"/><text x="90" y="133" font-family="-apple-system,Helvetica,Arial,sans-serif" font-size="110" text-anchor="middle" fill="#3fb950">π</text></svg>`,
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);
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return;
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}
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// LEGACY: browser HTML client root route
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if (pathname === "/" || pathname === "/index.html") {
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const cookies = parseCookies(req.headers.cookie);
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const sc = cookies[SESSION_COOKIE];
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const hasValidSession =
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sc !== undefined && (validSessions.get(sc) ?? 0) > Date.now();
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const providedToken = url.searchParams.get("token");
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const hasValidToken =
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providedToken && validateToken(providedToken, token);
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if (!hasValidSession && !hasValidToken) {
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res.writeHead(403, { "Content-Type": "text/plain; charset=utf-8" });
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res.end(
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"Forbidden — valid token required. Use the URL shown in the pi terminal.",
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);
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return;
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}
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// If authenticated via token (first visit), issue a session cookie and redirect to clean URL
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if (!hasValidSession && hasValidToken) {
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pruneExpiredSessions();
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const sessionId = generateSessionId();
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validSessions.set(sessionId, Date.now() + SESSION_TTL_MS);
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res.writeHead(302, {
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"Set-Cookie": `${SESSION_COOKIE}=${sessionId}; Path=/; HttpOnly; SameSite=Strict; Max-Age=86400`,
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Location: "/",
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});
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res.end();
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return;
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}
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// Valid session cookie — serve the browser HTML UI
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const nonce = randomBytes(16).toString("base64");
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res.writeHead(200, {
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"Content-Type": "text/html; charset=utf-8",
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"X-Frame-Options": "DENY",
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"X-Content-Type-Options": "nosniff",
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"Referrer-Policy": "no-referrer",
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"Content-Security-Policy": `default-src 'none'; script-src 'nonce-${nonce}'; style-src 'nonce-${nonce}'; connect-src 'self'; manifest-src 'self'; base-uri 'none'`,
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});
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res.end(buildHTML(nonce)); // LEGACY: renders the browser HTML client
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return;
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}
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// New API routes (IC-2) — bearer token auth
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const asyncHandler = async (): Promise<boolean> => {
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// Auth check for API routes
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const bearer = extractBearer(req);
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const isApiAuthed =
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(bearer && validateToken(bearer, token)) ||
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(bearer ? !!(await validateBearer(bearer).catch(() => null)) : false);
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if (!isApiAuthed) return false;
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// GET /health
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if (pathname === "/health" && req.method === "GET") {
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await handleHealth(req, res);
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return true;
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}
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// /sessions — list + create
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if (pathname === "/sessions") {
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await handleSessions(req, res);
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return true;
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}
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// /sessions/:id — PATCH, DELETE
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const sessMatch = pathname.match(/^\/sessions\/([^/]+)$/);
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if (sessMatch) {
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await handleSessions(req, res, decodeURIComponent(sessMatch[1]));
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return true;
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}
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// /sessions/:id/thumbnail
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const thumbMatch = pathname.match(/^\/sessions\/([^/]+)\/thumbnail$/);
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if (thumbMatch) {
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await handleSessions(
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req,
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res,
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decodeURIComponent(thumbMatch[1]),
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"thumbnail",
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);
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return true;
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}
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// /sessions/:id/commands
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const cmdMatch = pathname.match(/^\/sessions\/([^/]+)\/commands$/);
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if (cmdMatch) {
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await handleCommands(req, res, decodeURIComponent(cmdMatch[1]), pi);
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return true;
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}
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// /sessions/:id/input
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const inputMatch = pathname.match(/^\/sessions\/([^/]+)\/input$/);
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if (inputMatch) {
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await handleInput(req, res, decodeURIComponent(inputMatch[1]));
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return true;
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}
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return false;
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};
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asyncHandler()
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.then((handled) => {
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if (!handled) {
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res.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
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res.end("Not found");
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}
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})
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.catch((err: Error) => {
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res.writeHead(500, { "Content-Type": "text/plain; charset=utf-8" });
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res.end(err.message);
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});
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});
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// ── WebSocket server ────────────────────────────────────────────────────
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const wss = new WebSocketServer({ noServer: true });
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httpServer.on("error", (err: Error) => {
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console.error("[remote-control] httpServer error:", err.message);
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});
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wss.on("error", (err: Error) => {
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console.error("[remote-control] wss error:", err.message);
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});
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// Wire upgrade handler (see upgrade.ts for path routing)
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httpServer.on("upgrade", createUpgradeHandler(wss, isAuthenticated));
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// ── LEGACY: browser HTML client WebSocket connection handling ───────────
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wss.on("connection", (ws: WsClient) => {
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clients.add(ws);
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for (const cb of clientChangeListeners) cb();
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// Send full state snapshot to the new client
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try {
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ws.send(JSON.stringify(buildSyncMessage(ctx)));
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} catch {
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/* client disconnected before first send */
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}
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// Per-connection rate limiting: max 30 prompts per 60 seconds
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const RATE_WINDOW_MS = 60_000;
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const RATE_MAX = 30;
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const MAX_MSG_BYTES = 64 * 1024;
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const recentPrompts: number[] = [];
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ws.on("message", (data: Buffer) => {
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if (data.length > MAX_MSG_BYTES) return;
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let msg: { type?: string; text?: string };
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try {
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const parsed: unknown = JSON.parse(data.toString());
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if (typeof parsed !== "object" || parsed === null) return;
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msg = parsed as { type?: string; text?: string };
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} catch {
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return;
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}
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if (msg.type === "stop") {
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if (!ctx.isIdle()) {
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ctx.abort();
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}
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return;
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}
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if (
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msg.type === "prompt" &&
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typeof msg.text === "string" &&
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msg.text.trim()
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) {
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const text = msg.text.trim();
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// Sliding-window rate limit
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const now = Date.now();
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const cutoff = now - RATE_WINDOW_MS;
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while (recentPrompts.length > 0 && recentPrompts[0] < cutoff)
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recentPrompts.shift();
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if (recentPrompts.length >= RATE_MAX) return;
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recentPrompts.push(now);
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if (ctx.isIdle()) {
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pi.sendUserMessage(text);
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} else {
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pi.sendUserMessage(text, { deliverAs: "followUp" });
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}
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}
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});
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const onClose = (): void => {
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clients.delete(ws);
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broadcast({ type: "status", clientCount: clients.size });
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for (const cb of clientChangeListeners) cb();
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};
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ws.on("close", onClose);
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ws.on("error", onClose);
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});
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// ── Listen ───────────────────────────────────────────────────────────────
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return new Promise((resolve) => {
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httpServer.listen(bindPort, bindHost, () => {
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resolve({
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broadcast,
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sync,
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stop: () =>
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new Promise<void>((res) => {
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// Forcefully kill all WebSocket clients — terminate() sends no
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// close frame and doesn't wait for the remote end to acknowledge,
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// so it can't hang on an unresponsive client.
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for (const client of clients) {
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try {
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client.terminate();
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} catch {
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/* ignore */
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}
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}
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clients.clear();
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// Safety timeout — if wss/http shutdown callbacks never fire
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// (e.g. lingering keep-alive sockets), resolve anyway so the
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// session_shutdown handler doesn't block pi from exiting.
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const timeout = setTimeout(() => {
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httpServer.close(() => {});
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httpServer.closeAllConnections?.();
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res();
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}, 2000);
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wss.close(() =>
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httpServer.close(() => {
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clearTimeout(timeout);
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res();
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}),
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);
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}),
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clientCount: () => clients.size,
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onClientChange: (cb: () => void) => {
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clientChangeListeners.push(cb);
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},
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get port() {
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return (httpServer.address() as AddressInfo | null)?.port ?? 0;
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},
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get token() {
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return token;
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},
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});
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});
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});
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}
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