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import json
from calendar import timegm
from collections.abc import Iterable, Mapping
from datetime import datetime, timedelta, timezone
from typing import Any, Dict, List, Optional, Type, Union
from . import api_jws
from .exceptions import (
DecodeError,
ExpiredSignatureError,
ImmatureSignatureError,
InvalidAudienceError,
InvalidIssuedAtError,
InvalidIssuerError,
MissingRequiredClaimError,
)
class PyJWT:
def __init__(self, options=None):
if options is None:
options = {}
self.options = {**self._get_default_options(), **options}
@staticmethod
def _get_default_options() -> Dict[str, Union[bool, List[str]]]:
return {
"verify_signature": True,
"verify_exp": True,
"verify_nbf": True,
"verify_iat": True,
"verify_aud": True,
"verify_iss": True,
"require": [],
}
def encode(
self,
payload: Dict[str, Any],
key: str,
algorithm: Optional[str] = "HS256",
headers: Optional[Dict] = None,
json_encoder: Optional[Type[json.JSONEncoder]] = None,
) -> str:
# Check that we get a mapping
if not isinstance(payload, Mapping):
raise TypeError(
"Expecting a mapping object, as JWT only supports "
"JSON objects as payloads."
)
# Payload
payload = payload.copy()
for time_claim in ["exp", "iat", "nbf"]:
# Convert datetime to a intDate value in known time-format claims
if isinstance(payload.get(time_claim), datetime):
payload[time_claim] = timegm(payload[time_claim].utctimetuple())
json_payload = json.dumps(
payload, separators=(",", ":"), cls=json_encoder
).encode("utf-8")
return api_jws.encode(json_payload, key, algorithm, headers, json_encoder)
def decode_complete(
self,
jwt: str,
key: str = "",
algorithms: List[str] = None,
options: Dict = None,
**kwargs,
) -> Dict[str, Any]:
if options is None:
options = {"verify_signature": True}
else:
options.setdefault("verify_signature", True)
if not options["verify_signature"]:
options.setdefault("verify_exp", False)
options.setdefault("verify_nbf", False)
options.setdefault("verify_iat", False)
options.setdefault("verify_aud", False)
options.setdefault("verify_iss", False)
if options["verify_signature"] and not algorithms:
raise DecodeError(
'It is required that you pass in a value for the "algorithms" argument when calling decode().'
)
decoded = api_jws.decode_complete(
jwt,
key=key,
algorithms=algorithms,
options=options,
**kwargs,
)
try:
payload = json.loads(decoded["payload"])
except ValueError as e:
raise DecodeError("Invalid payload string: %s" % e)
if not isinstance(payload, dict):
raise DecodeError("Invalid payload string: must be a json object")
merged_options = {**self.options, **options}
self._validate_claims(payload, merged_options, **kwargs)
decoded["payload"] = payload
return decoded
def decode(
self,
jwt: str,
key: str = "",
algorithms: List[str] = None,
options: Dict = None,
**kwargs,
) -> Dict[str, Any]:
decoded = self.decode_complete(jwt, key, algorithms, options, **kwargs)
return decoded["payload"]
def _validate_claims(
self, payload, options, audience=None, issuer=None, leeway=0, **kwargs
):
if isinstance(leeway, timedelta):
leeway = leeway.total_seconds()
if not isinstance(audience, (bytes, str, type(None), Iterable)):
raise TypeError("audience must be a string, iterable, or None")
self._validate_required_claims(payload, options)
now = timegm(datetime.now(tz=timezone.utc).utctimetuple())
if "iat" in payload and options["verify_iat"]:
self._validate_iat(payload, now, leeway)
if "nbf" in payload and options["verify_nbf"]:
self._validate_nbf(payload, now, leeway)
if "exp" in payload and options["verify_exp"]:
self._validate_exp(payload, now, leeway)
if options["verify_iss"]:
self._validate_iss(payload, issuer)
if options["verify_aud"]:
self._validate_aud(payload, audience)
def _validate_required_claims(self, payload, options):
for claim in options["require"]:
if payload.get(claim) is None:
raise MissingRequiredClaimError(claim)
def _validate_iat(self, payload, now, leeway):
try:
int(payload["iat"])
except ValueError:
raise InvalidIssuedAtError("Issued At claim (iat) must be an integer.")
def _validate_nbf(self, payload, now, leeway):
try:
nbf = int(payload["nbf"])
except ValueError:
raise DecodeError("Not Before claim (nbf) must be an integer.")
if nbf > (now + leeway):
raise ImmatureSignatureError("The token is not yet valid (nbf)")
def _validate_exp(self, payload, now, leeway):
try:
exp = int(payload["exp"])
except ValueError:
raise DecodeError("Expiration Time claim (exp) must be an" " integer.")
if exp < (now - leeway):
raise ExpiredSignatureError("Signature has expired")
def _validate_aud(self, payload, audience):
if audience is None:
if "aud" not in payload or not payload["aud"]:
return
# Application did not specify an audience, but
# the token has the 'aud' claim
raise InvalidAudienceError("Invalid audience")
if "aud" not in payload or not payload["aud"]:
# Application specified an audience, but it could not be
# verified since the token does not contain a claim.
raise MissingRequiredClaimError("aud")
audience_claims = payload["aud"]
if isinstance(audience_claims, str):
audience_claims = [audience_claims]
if not isinstance(audience_claims, list):
raise InvalidAudienceError("Invalid claim format in token")
if any(not isinstance(c, str) for c in audience_claims):
raise InvalidAudienceError("Invalid claim format in token")
if isinstance(audience, str):
audience = [audience]
if all(aud not in audience_claims for aud in audience):
raise InvalidAudienceError("Invalid audience")
def _validate_iss(self, payload, issuer):
if issuer is None:
return
if "iss" not in payload:
raise MissingRequiredClaimError("iss")
if payload["iss"] != issuer:
raise InvalidIssuerError("Invalid issuer")
_jwt_global_obj = PyJWT()
encode = _jwt_global_obj.encode
decode_complete = _jwt_global_obj.decode_complete
decode = _jwt_global_obj.decode
|
