mirror of
https://github.com/Gabi-Zar/Pico-2W-Computer-Power-Controller.git
synced 2026-08-02 23:36:23 +02:00
242 lines
6.6 KiB
Python
242 lines
6.6 KiB
Python
import os
|
|
import time
|
|
import network
|
|
import utime
|
|
import ubinascii
|
|
import uhashlib
|
|
import uasyncio as asyncio
|
|
|
|
from machine import Pin
|
|
from config import WIFI_SSID, WIFI_PASSWORD, PASSWORD
|
|
|
|
led = Pin("LED", Pin.OUT, value=0)
|
|
computer = Pin(2, Pin.OUT)
|
|
|
|
wlan = network.WLAN(network.STA_IF)
|
|
|
|
_nonce = ""
|
|
_nonce_ts = 0
|
|
NONCE_TTL_MS = 5 * 60 * 1000
|
|
|
|
HTML = """\
|
|
<!DOCTYPE html>
|
|
<html>
|
|
<head><title>Pico W</title></head>
|
|
<body>
|
|
<h1>Pico W - Computer Management</h1>
|
|
%s
|
|
<form id="form" method="POST" action="/computer">
|
|
<input type="hidden" id="nonce" name="nonce" value="%s">
|
|
<input type="hidden" id="hmac" name="hmac">
|
|
<input type="password" id="pwd" placeholder="Password" required>
|
|
<button type="submit">Turn On/Off</button>
|
|
</form>
|
|
<script src="/crypto-js.min.js"></script>
|
|
<script>
|
|
document.getElementById('form').addEventListener('submit', async function(event) {
|
|
event.preventDefault();
|
|
const pwd = document.getElementById('pwd').value;
|
|
const nonce = document.getElementById('nonce').value;
|
|
const hmac = CryptoJS.HmacSHA256(nonce, pwd).toString(CryptoJS.enc.Hex);
|
|
|
|
document.getElementById('hmac').value = hmac;
|
|
document.getElementById('pwd').value = '';
|
|
this.submit();
|
|
});
|
|
</script>
|
|
</body>
|
|
</html>
|
|
"""
|
|
|
|
MSG_WRONG = "<p><strong>Wrong password.</strong></p>"
|
|
MSG_OK = "<p>Signal sent to computer.</p>"
|
|
MSG_EXPIRED = "<p><strong>Session expired, please reload the page.</strong></p>"
|
|
|
|
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:
|
|
request_line = await reader.readline()
|
|
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:
|
|
header = await reader.readline()
|
|
if header == b"\r\n":
|
|
break
|
|
if header.lower().startswith(b"content-length:"):
|
|
content_length = int(header.split(b":")[1].strip())
|
|
|
|
message = ""
|
|
|
|
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 == "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() |