Wrong password.
" MSG_OK = "Signal sent to computer.
" MSG_EXPIRED = "Session expired, please reload the page.
" def _new_nonce() -> str: global _nonce, _nonce_ts _nonce = ubinascii.hexlify(os.urandom(16)).decode() _nonce_ts = utime.ticks_ms() return _nonce def _nonce_valid(received: str) -> bool: expired = utime.ticks_diff(utime.ticks_ms(), _nonce_ts) > NONCE_TTL_MS return (not expired) and (_nonce != "") and (received == _nonce) def _invalidate_nonce(): global _nonce, _nonce_ts _nonce = "" _nonce_ts = 0 def hmac_sha256(key: str, message: str) -> str: BLOCK = 64 k = key.encode() if isinstance(key, str) else key m = message.encode() if isinstance(message, str) else message if len(k) > BLOCK: k = uhashlib.sha256(k).digest() k = k + b'\x00' * (BLOCK - len(k)) ipad = bytes(b ^ 0x36 for b in k) opad = bytes(b ^ 0x5c for b in k) ih = uhashlib.sha256() ih.update(ipad) ih.update(m) oh = uhashlib.sha256() oh.update(opad) oh.update(ih.digest()) return ubinascii.hexlify(oh.digest()).decode() def ct_equal(a: str, b: str) -> bool: if len(a) != len(b): return False result = 0 for x, y in zip(a.encode(), b.encode()): result |= x ^ y return result == 0 def url_decode(s): s = s.replace("+", " ") out = [] i = 0 while i < len(s): if s[i] == "%" and i + 2 < len(s): out.append(chr(int(s[i + 1:i + 3], 16))) i += 3 else: out.append(s[i]) i += 1 return "".join(out) def parse_form(body): params = {} for pair in body.split("&"): if "=" in pair: k, v = pair.split("=", 1) params[url_decode(k)] = url_decode(v) return params async def toggleComputer(): led.value(1) computer.value(1) await asyncio.sleep(0.5) led.value(0) computer.value(0) def _do_connect(): wlan.active(True) wlan.config(pm = 0xa11140) # disable power-save mode wlan.connect(WIFI_SSID, WIFI_PASSWORD) for _ in range(10): status = wlan.status() if status == network.STAT_GOT_IP: print("Wi-Fi connected:", wlan.ifconfig()[0]) return True if status < 0: break time.sleep(1) print("Connection failed (status=%d)" % wlan.status()) return False def connect_wifi(): while True: print("Connecting to Wi-Fi…") if _do_connect(): return wlan.disconnect() time.sleep(3) async def wifi_watchdog(): while True: await asyncio.sleep(5) if wlan.status() != network.STAT_GOT_IP: print("Wi-Fi lost - reconnecting…") wlan.disconnect() await asyncio.sleep(1) while not _do_connect(): wlan.disconnect() await asyncio.sleep(3) print("Wi-Fi restored:", wlan.ifconfig()[0]) async def serve_client(reader, writer): try: HEADER_TIMEOUT_MS = 5000 start = utime.ticks_ms() try: request_line = await asyncio.wait_for(reader.readline(), 5) except asyncio.TimeoutError: return if utime.ticks_diff(utime.ticks_ms(), start) > HEADER_TIMEOUT_MS: return if not request_line: return print("Request:", request_line.strip()) parts = request_line.decode().split() method = parts[0] if parts else "GET" path = parts[1] if len(parts) > 1 else "/" content_length = 0 while True: if utime.ticks_diff(utime.ticks_ms(), start) > HEADER_TIMEOUT_MS: return try: header = await asyncio.wait_for(reader.readline(), 5) except asyncio.TimeoutError: return if header == b"\r\n": break if header.lower().startswith(b"content-length:"): content_length = int(header.split(b":")[1].strip()) message = "" if content_length > 256: writer.write( "HTTP/1.0 413 Payload Too Large\r\n" "Connection: close\r\n\r\n" ) await writer.drain() return if method == "GET" and path == "/crypto-js.min.js": with open("crypto-js.min.js", "rb") as f: js = f.read() writer.write( "HTTP/1.0 200 OK\r\n" "Content-Type: application/javascript\r\n" "Content-Length: %d\r\n\r\n" % len(js) ) writer.write(js) await writer.drain() return if method == "GET" and path == "/favicon.ico": writer.write( "HTTP/1.0 204 No Content\r\n" "Connection: close\r\n" "\r\n" ) await writer.drain() return if method == "POST" and path == "/computer" and content_length > 0: body = await reader.read(content_length) params = parse_form(body.decode()) received_nonce = params.get("nonce", "") received_hmac = params.get("hmac", "") if not _nonce_valid(received_nonce): message = MSG_EXPIRED else: expected = hmac_sha256(PASSWORD, received_nonce) _invalidate_nonce() if ct_equal(expected, received_hmac): asyncio.create_task(toggleComputer()) message = MSG_OK else: message = MSG_WRONG nonce = _new_nonce() writer.write("HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n") writer.write(HTML % (message, nonce)) await writer.drain() except OSError as e: print("Client disconnected unexpectedly:", e) finally: await writer.wait_closed() async def main(): print("Connecting to network…") connect_wifi() print("Starting web server on port 80…") asyncio.create_task(asyncio.start_server(serve_client, "0.0.0.0", 80)) asyncio.create_task(wifi_watchdog()) while True: await asyncio.sleep(60) try: asyncio.run(main()) finally: asyncio.new_event_loop()