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from typing import Optional, Dict, Union, List
from urllib.request import build_opener
from urllib.request import (
HTTPDigestAuthHandler, HTTPPasswordMgrWithDefaultRealm
)
from urllib.parse import urlencode
from urllib.error import HTTPError, URLError
from hashlib import sha256
import json
from .....base import Device
from .....exceptions import (
UnauthorizedException,
InvalidRequestException,
ConnectionRefusedException,
)
PARA_TYPE = Optional[
Dict[
str,
Union[
str,
int,
float,
bool,
List[str]
]
]
]
EXC_DATA_LIMIT = 0xF
_PAYLOAD_COUNTER = 0
# Default urllib digest handler does not support SHA-256
class ShellyDigestAuthHandler(HTTPDigestAuthHandler):
def get_algorithm_impls(self, algorithm):
if algorithm == "SHA-256":
H = lambda x: sha256(x.encode("ascii")).hexdigest()
else:
return super().get_algorithm_impls(algorithm)
KD = lambda s, d: H("%s:%s" % (s, d))
return H, KD
class Request:
def __init__(self, device: Device):
self.auth = None
self.device = device
@staticmethod
def get_payload_id():
global _PAYLOAD_COUNTER
_PAYLOAD_COUNTER += 1
return _PAYLOAD_COUNTER
@staticmethod
def sha256(inp: str) -> str:
return sha256(str.encode()).hexdigest()
def post(self, method: str, params: PARA_TYPE = None):
hostname = self.device.hostname
port = self.device.port or "80"
url = f"http://{hostname}:{port}/rpc"
payload_id = self.get_payload_id()
payload = {
"jsonrpc": "2.0",
"id": payload_id,
"method": method,
}
if params is not None:
payload["params"] = params
if self.device._debug:
str_params = ", ".join([f"{k}={v}" for k,v in params.items()])
print(f"[DEBUG] {method}({str_params})")
opener = build_opener()
raw_payload = json.dumps(payload)
raw_payload_bytes = raw_payload.encode('utf-8') # needs to be bytes
opener.addheaders = [
('Content-Type', 'application/json; charset=utf-8'),
('Content-Length', len(raw_payload_bytes))
]
try:
if not self.device._credentials:
raise ValueError()
username, password = "admin", self.device._credentials[1]
passman = HTTPPasswordMgrWithDefaultRealm()
passman.add_password(None, url, username, password)
authhandler = ShellyDigestAuthHandler(passman)
opener.add_handler(authhandler)
except (TypeError, IndexError):
# can't unpack
pass
try:
with opener.open(url, data=raw_payload_bytes, timeout=self.device.timeout) as f:
result = f.read().decode()
try:
data = json.loads(result)
except Exception as e:
data = json.dumps(result)
if (len(data) > EXC_DATA_LIMIT):
data = f"{data[:EXC_DATA_LIMIT]}..."
raise ValueError(f"Expected JSON, received {data}") from None
if (data["id"] != payload_id):
raise ValueError("Invalid payload ID")
try:
return data["result"]
except KeyError:
raise InvalidRequestException(data["error"]["message"])
except HTTPError as e:
if e.status == 401:
raise UnauthorizedException() from None
raise InvalidRequestException()
except URLError as e:
raise ConnectionRefusedException(e.reason) from None
def json_post(self, *args, **kwargs):
return self.post(*args, **kwargs)
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