Add local ADB web remote for Android TV

Node/Express server shells out to adb (connect/pair/keyevent/text/app launch) and serves a mobile-first installable PWA remote: power, mute, input switch, volume/channel rockers, D-pad, media transport, text entry, and one-tap streaming app launch. Supports multiple saved TVs and the Android 11+ wireless-debugging pairing flow. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RSVyYcrjrbmrMKT85G4fyn
2026-09-26 12:40:01 +00:00
commit 6db1db70a0
18 changed files with 2246 additions and 0 deletions
@@ -0,0 +1,835 @@
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4.0"
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+    },
+    "node_modules/vary": {
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+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
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+      "license": "MIT",
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+    }
+  }
+}
@@ -0,0 +1,17 @@
+{
+  "name": "tv-adb-remote-server",
+  "version": "1.0.0",
+  "description": "Local server that bridges a web/PWA remote control to Android TV over ADB",
+  "type": "module",
+  "main": "src/index.js",
+  "scripts": {
+    "start": "node src/index.js",
+    "test": "node --test test/*.test.js"
+  },
+  "dependencies": {
+    "express": "^4.19.2"
+  },
+  "engines": {
+    "node": ">=18"
+  }
+}
@@ -0,0 +1,111 @@
+import { execFile } from "node:child_process";
+import { promisify } from "node:util";
+
+const execFileAsync = promisify(execFile);
+
+const ADB_BIN = process.env.ADB_BIN || "adb";
+const EXEC_TIMEOUT_MS = 8000;
+
+class AdbError extends Error {
+  constructor(message, { code, stderr } = {}) {
+    super(message);
+    this.name = "AdbError";
+    this.code = code;
+    this.stderr = stderr;
+  }
+}
+
+function run(args) {
+  return execFileAsync(ADB_BIN, args, { timeout: EXEC_TIMEOUT_MS }).catch((err) => {
+    if (err.code === "ENOENT") {
+      throw new AdbError(
+        "adb binary not found on this machine. Install Android platform-tools and make sure `adb` is on PATH.",
+        { code: "ADB_NOT_FOUND" }
+      );
+    }
+    throw new AdbError(err.stderr?.trim() || err.message, {
+      code: "ADB_COMMAND_FAILED",
+      stderr: err.stderr,
+    });
+  });
+}
+
+// Accepts "host" or "host:port" and rejects anything that isn't a plausible
+// address, since this value is passed straight to execFile as a single arg
+// (no shell involved, but we still don't want to hand adb garbage).
+const HOST_PORT_RE = /^[a-zA-Z0-9.\-]+(:\d{1,5})?$/;
+
+export function normalizeTarget(hostOrHostPort) {
+  const trimmed = String(hostOrHostPort || "").trim();
+  if (!HOST_PORT_RE.test(trimmed)) {
+    throw new AdbError(`"${hostOrHostPort}" doesn't look like a valid host or host:port`, {
+      code: "INVALID_TARGET",
+    });
+  }
+  return trimmed.includes(":") ? trimmed : `${trimmed}:5555`;
+}
+
+export async function connect(hostOrHostPort) {
+  const target = normalizeTarget(hostOrHostPort);
+  const { stdout } = await run(["connect", target]);
+  const text = stdout.trim();
+  // adb prints "failed to connect..." on stdout with exit code 0, so we
+  // have to sniff the message instead of relying on the exit status.
+  if (/failed|unable|cannot/i.test(text)) {
+    throw new AdbError(text, { code: "CONNECT_FAILED" });
+  }
+  return { target, message: text };
+}
+
+export async function disconnect(hostOrHostPort) {
+  const target = normalizeTarget(hostOrHostPort);
+  const { stdout } = await run(["disconnect", target]);
+  return { target, message: stdout.trim() };
+}
+
+export async function pair(hostAndPort, code) {
+  if (!/^\d{6}$/.test(String(code))) {
+    throw new AdbError("Pairing code must be exactly 6 digits", { code: "INVALID_PAIR_CODE" });
+  }
+  const target = normalizeTarget(hostAndPort);
+  const { stdout } = await run(["pair", target, String(code)]);
+  const text = stdout.trim();
+  if (/failed|unable|cannot/i.test(text)) {
+    throw new AdbError(text, { code: "PAIR_FAILED" });
+  }
+  return { target, message: text };
+}
+
+export async function listDevices() {
+  const { stdout } = await run(["devices", "-l"]);
+  return stdout
+    .split("\n")
+    .slice(1)
+    .map((line) => line.trim())
+    .filter(Boolean)
+    .map((line) => {
+      const [serial, state, ...rest] = line.split(/\s+/);
+      return { serial, state, details: rest.join(" ") };
+    });
+}
+
+export async function shell(serial, ...shellArgs) {
+  const target = normalizeTarget(serial);
+  return run(["-s", target, "shell", ...shellArgs]);
+}
+
+export async function keyevent(serial, code) {
+  await shell(serial, "input", "keyevent", String(code));
+}
+
+export async function sendText(serial, text) {
+  // Android's `input text` treats spaces specially; %s is the documented escape.
+  const escaped = String(text).replace(/ /g, "%s");
+  await shell(serial, "input", "text", escaped);
+}
+
+export async function launchApp(serial, packageName) {
+  await shell(serial, "monkey", "-p", packageName, "-c", "android.intent.category.LAUNCHER", "1");
+}
+
+export { AdbError };
@@ -0,0 +1,49 @@
+import { readFile, writeFile, mkdir } from "node:fs/promises";
+import { dirname } from "node:path";
+import { randomUUID } from "node:crypto";
+
+const DATA_FILE = process.env.DEVICES_FILE || new URL("../../data/devices.json", import.meta.url).pathname;
+
+async function load() {
+  try {
+    const raw = await readFile(DATA_FILE, "utf8");
+    const parsed = JSON.parse(raw);
+    return Array.isArray(parsed.devices) ? parsed.devices : [];
+  } catch (err) {
+    if (err.code === "ENOENT") return [];
+    throw err;
+  }
+}
+
+async function save(devices) {
+  await mkdir(dirname(DATA_FILE), { recursive: true });
+  await writeFile(DATA_FILE, JSON.stringify({ devices }, null, 2), "utf8");
+}
+
+export async function listSavedDevices() {
+  return load();
+}
+
+export async function addSavedDevice({ name, host }) {
+  const devices = await load();
+  const device = { id: randomUUID(), name: name || host, host };
+  devices.push(device);
+  await save(devices);
+  return device;
+}
+
+export async function removeSavedDevice(id) {
+  const devices = await load();
+  const next = devices.filter((d) => d.id !== id);
+  await save(next);
+  return next.length !== devices.length;
+}
+
+export async function updateSavedDevice(id, patch) {
+  const devices = await load();
+  const idx = devices.findIndex((d) => d.id === id);
+  if (idx === -1) return null;
+  devices[idx] = { ...devices[idx], ...patch };
+  await save(devices);
+  return devices[idx];
+}
@@ -0,0 +1,179 @@
+import express from "express";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+
+import * as adb from "./adb.js";
+import { KEYCODES, isValidKeycodeName } from "./keycodes.js";
+import {
+  listSavedDevices,
+  addSavedDevice,
+  removeSavedDevice,
+  updateSavedDevice,
+} from "./deviceStore.js";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const PUBLIC_DIR = join(__dirname, "..", "..", "public");
+const PORT = process.env.PORT || 8787;
+
+const app = express();
+app.use(express.json());
+app.use(express.static(PUBLIC_DIR));
+
+function handle(fn) {
+  return async (req, res) => {
+    try {
+      await fn(req, res);
+    } catch (err) {
+      const status = err.name === "AdbError" ? 502 : 400;
+      res.status(status).json({ error: err.message, code: err.code });
+    }
+  };
+}
+
+async function requireDevice(req) {
+  const devices = await listSavedDevices();
+  const device = devices.find((d) => d.id === req.params.id);
+  if (!device) {
+    const err = new Error("Unknown device id");
+    err.code = "DEVICE_NOT_FOUND";
+    throw err;
+  }
+  return device;
+}
+
+app.get("/api/health", (req, res) => res.json({ ok: true }));
+
+app.get("/api/keycodes", (req, res) => res.json({ keycodes: Object.keys(KEYCODES) }));
+
+app.get(
+  "/api/devices",
+  handle(async (req, res) => {
+    const [saved, live] = await Promise.all([listSavedDevices(), adb.listDevices().catch(() => [])]);
+    const liveBySerial = new Map(live.map((d) => [d.serial, d]));
+    const merged = saved.map((d) => {
+      const port = d.host.includes(":") ? d.host : `${d.host}:5555`;
+      const liveMatch = liveBySerial.get(port);
+      return { ...d, status: liveMatch?.state || "disconnected" };
+    });
+    res.json({ devices: merged });
+  })
+);
+
+app.post(
+  "/api/devices",
+  handle(async (req, res) => {
+    const { name, host } = req.body || {};
+    if (!host) {
+      const err = new Error("host is required");
+      err.code = "MISSING_HOST";
+      throw err;
+    }
+    adb.normalizeTarget(host); // validate early with a clear error
+    const device = await addSavedDevice({ name, host });
+    res.status(201).json({ device });
+  })
+);
+
+app.delete(
+  "/api/devices/:id",
+  handle(async (req, res) => {
+    const removed = await removeSavedDevice(req.params.id);
+    if (!removed) return res.status(404).json({ error: "Unknown device id" });
+    res.json({ ok: true });
+  })
+);
+
+app.post(
+  "/api/devices/:id/connect",
+  handle(async (req, res) => {
+    const device = await requireDevice(req);
+    const result = await adb.connect(device.host);
+    res.json(result);
+  })
+);
+
+app.post(
+  "/api/devices/:id/disconnect",
+  handle(async (req, res) => {
+    const device = await requireDevice(req);
+    const result = await adb.disconnect(device.host);
+    res.json(result);
+  })
+);
+
+app.post(
+  "/api/devices/:id/pair",
+  handle(async (req, res) => {
+    const device = await requireDevice(req);
+    const { pairHost, code } = req.body || {};
+    if (!pairHost || !code) {
+      const err = new Error("pairHost and code are required");
+      err.code = "MISSING_PAIR_INFO";
+      throw err;
+    }
+    const result = await adb.pair(pairHost, code);
+    // Once paired, Android TV also opens the normal debugging port, so try
+    // connecting on the device's saved host right after.
+    await adb.connect(device.host).catch(() => {});
+    res.json(result);
+  })
+);
+
+app.post(
+  "/api/devices/:id/key",
+  handle(async (req, res) => {
+    const device = await requireDevice(req);
+    const { key } = req.body || {};
+    if (!isValidKeycodeName(key)) {
+      const err = new Error(`Unknown key "${key}"`);
+      err.code = "UNKNOWN_KEY";
+      throw err;
+    }
+    await adb.keyevent(device.host, KEYCODES[key]);
+    res.json({ ok: true, key });
+  })
+);
+
+app.post(
+  "/api/devices/:id/text",
+  handle(async (req, res) => {
+    const device = await requireDevice(req);
+    const { text } = req.body || {};
+    if (typeof text !== "string" || !text.length) {
+      const err = new Error("text is required");
+      err.code = "MISSING_TEXT";
+      throw err;
+    }
+    await adb.sendText(device.host, text);
+    res.json({ ok: true });
+  })
+);
+
+app.post(
+  "/api/devices/:id/app",
+  handle(async (req, res) => {
+    const device = await requireDevice(req);
+    const { package: packageName } = req.body || {};
+    if (!packageName) {
+      const err = new Error("package is required");
+      err.code = "MISSING_PACKAGE";
+      throw err;
+    }
+    await adb.launchApp(device.host, packageName);
+    res.json({ ok: true });
+  })
+);
+
+app.patch(
+  "/api/devices/:id",
+  handle(async (req, res) => {
+    const { name } = req.body || {};
+    const updated = await updateSavedDevice(req.params.id, { name });
+    if (!updated) return res.status(404).json({ error: "Unknown device id" });
+    res.json({ device: updated });
+  })
+);
+
+app.listen(PORT, () => {
+  console.log(`TV ADB Remote server listening on http://0.0.0.0:${PORT}`);
+});
@@ -0,0 +1,33 @@
+// Android KeyEvent codes used by `adb shell input keyevent <code>`.
+// Reference: https://developer.android.com/reference/android/view/KeyEvent
+export const KEYCODES = {
+  POWER: 26,
+  SLEEP: 223,
+  WAKEUP: 224,
+  HOME: 3,
+  BACK: 4,
+  MENU: 82,
+  DPAD_UP: 19,
+  DPAD_DOWN: 20,
+  DPAD_LEFT: 21,
+  DPAD_RIGHT: 22,
+  DPAD_CENTER: 23,
+  VOLUME_UP: 24,
+  VOLUME_DOWN: 25,
+  VOLUME_MUTE: 164,
+  CHANNEL_UP: 166,
+  CHANNEL_DOWN: 167,
+  TV_INPUT: 178,
+  TV_INPUT_HDMI_1: 243,
+  TV_INPUT_HDMI_2: 244,
+  TV_INPUT_HDMI_3: 245,
+  MEDIA_PLAY_PAUSE: 85,
+  MEDIA_REWIND: 89,
+  MEDIA_FAST_FORWARD: 90,
+  SETTINGS: 176,
+  INFO: 165,
+};
+
+export function isValidKeycodeName(name) {
+  return Object.prototype.hasOwnProperty.call(KEYCODES, name);
+}
@@ -0,0 +1,36 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import * as adb from "../src/adb.js";
+
+test("normalizeTarget adds default port 5555", () => {
+  assert.equal(adb.normalizeTarget("192.168.1.50"), "192.168.1.50:5555");
+});
+
+test("normalizeTarget keeps an explicit port", () => {
+  assert.equal(adb.normalizeTarget("192.168.1.50:5556"), "192.168.1.50:5556");
+});
+
+test("normalizeTarget trims whitespace", () => {
+  assert.equal(adb.normalizeTarget("  192.168.1.50  "), "192.168.1.50:5555");
+});
+
+test("normalizeTarget rejects shell-hostile input", () => {
+  assert.throws(() => adb.normalizeTarget("1.2.3.4; rm -rf /"), /doesn't look like/);
+});
+
+test("normalizeTarget rejects empty input", () => {
+  assert.throws(() => adb.normalizeTarget(""), /doesn't look like/);
+});
+
+test("connect() rejects cleanly against a closed local port instead of hanging", async () => {
+  // Nothing listens on 5599 locally, so `adb connect` should fail fast with
+  // a normal error rather than the process throwing an unhandled exception.
+  await assert.rejects(adb.connect("127.0.0.1:5599"), (err) => {
+    assert.equal(err.name, "AdbError");
+    return true;
+  });
+});
+
+test("pair() rejects a non-6-digit code before touching adb", async () => {
+  await assert.rejects(adb.pair("127.0.0.1:5599", "12"), /6 digits/);
+});
@@ -0,0 +1,34 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { mkdtemp, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+test("deviceStore add/list/update/remove roundtrip", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "tv-remote-test-"));
+  process.env.DEVICES_FILE = join(dir, "devices.json");
+
+  // Import fresh so it picks up the env var above.
+  const store = await import(`../src/deviceStore.js?t=${Date.now()}`);
+
+  assert.deepEqual(await store.listSavedDevices(), []);
+
+  const device = await store.addSavedDevice({ name: "Living Room", host: "192.168.1.50" });
+  assert.equal(device.name, "Living Room");
+  assert.ok(device.id);
+
+  let list = await store.listSavedDevices();
+  assert.equal(list.length, 1);
+
+  const updated = await store.updateSavedDevice(device.id, { name: "Lounge" });
+  assert.equal(updated.name, "Lounge");
+
+  const removed = await store.removeSavedDevice(device.id);
+  assert.equal(removed, true);
+
+  list = await store.listSavedDevices();
+  assert.equal(list.length, 0);
+
+  await rm(dir, { recursive: true, force: true });
+  delete process.env.DEVICES_FILE;
+});