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from __future__ import annotations
import json
import warnings
from calendar import timegm
from collections.abc import Iterable
from datetime import datetime, timedelta, timezone
from typing import TYPE_CHECKING, Any
from . import api_jws
from .exceptions import (
DecodeError,
ExpiredSignatureError,
ImmatureSignatureError,
InvalidAudienceError,
InvalidIssuedAtError,
InvalidIssuerError,
MissingRequiredClaimError,
)
from .warnings import RemovedInPyjwt3Warning
if TYPE_CHECKING:
from .algorithms import AllowedPrivateKeys, AllowedPublicKeys
class PyJWT:
def __init__(self, options: dict[str, Any] | None = None) -> None:
if options is None:
options = {}
self.options: dict[str, Any] = {**self._get_default_options(), **options}
@staticmethod
def _get_default_options() -> dict[str, 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: AllowedPrivateKeys | str | bytes,
algorithm: str | None = "HS256",
headers: dict[str, Any] | None = None,
json_encoder: type[json.JSONEncoder] | None = None,
sort_headers: bool = True,
) -> str:
# Check that we get a dict
if not isinstance(payload, dict):
raise TypeError(
"Expecting a dict 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 = self._encode_payload(
payload,
headers=headers,
json_encoder=json_encoder,
)
return api_jws.encode(
json_payload,
key,
algorithm,
headers,
json_encoder,
sort_headers=sort_headers,
)
def _encode_payload(
self,
payload: dict[str, Any],
headers: dict[str, Any] | None = None,
json_encoder: type[json.JSONEncoder] | None = None,
) -> bytes:
"""
Encode a given payload to the bytes to be signed.
This method is intended to be overridden by subclasses that need to
encode the payload in a different way, e.g. compress the payload.
"""
return json.dumps(
payload,
separators=(",", ":"),
cls=json_encoder,
).encode("utf-8")
def decode_complete(
self,
jwt: str | bytes,
key: AllowedPublicKeys | str | bytes = "",
algorithms: list[str] | None = None,
options: dict[str, Any] | None = None,
# deprecated arg, remove in pyjwt3
verify: bool | None = None,
# could be used as passthrough to api_jws, consider removal in pyjwt3
detached_payload: bytes | None = None,
# passthrough arguments to _validate_claims
# consider putting in options
audience: str | Iterable[str] | None = None,
issuer: str | None = None,
leeway: float | timedelta = 0,
# kwargs
**kwargs: Any,
) -> dict[str, Any]:
if kwargs:
warnings.warn(
"passing additional kwargs to decode_complete() is deprecated "
"and will be removed in pyjwt version 3. "
f"Unsupported kwargs: {tuple(kwargs.keys())}",
RemovedInPyjwt3Warning,
)
options = dict(options or {}) # shallow-copy or initialize an empty dict
options.setdefault("verify_signature", True)
# If the user has set the legacy `verify` argument, and it doesn't match
# what the relevant `options` entry for the argument is, inform the user
# that they're likely making a mistake.
if verify is not None and verify != options["verify_signature"]:
warnings.warn(
"The `verify` argument to `decode` does nothing in PyJWT 2.0 and newer. "
"The equivalent is setting `verify_signature` to False in the `options` dictionary. "
"This invocation has a mismatch between the kwarg and the option entry.",
category=DeprecationWarning,
)
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,
detached_payload=detached_payload,
)
payload = self._decode_payload(decoded)
merged_options = {**self.options, **options}
self._validate_claims(
payload, merged_options, audience=audience, issuer=issuer, leeway=leeway
)
decoded["payload"] = payload
return decoded
def _decode_payload(self, decoded: dict[str, Any]) -> Any:
"""
Decode the payload from a JWS dictionary (payload, signature, header).
This method is intended to be overridden by subclasses that need to
decode the payload in a different way, e.g. decompress compressed
payloads.
"""
try:
payload = json.loads(decoded["payload"])
except ValueError as e:
raise DecodeError(f"Invalid payload string: {e}")
if not isinstance(payload, dict):
raise DecodeError("Invalid payload string: must be a json object")
return payload
def decode(
self,
jwt: str | bytes,
key: AllowedPublicKeys | str | bytes = "",
algorithms: list[str] | None = None,
options: dict[str, Any] | None = None,
# deprecated arg, remove in pyjwt3
verify: bool | None = None,
# could be used as passthrough to api_jws, consider removal in pyjwt3
detached_payload: bytes | None = None,
# passthrough arguments to _validate_claims
# consider putting in options
audience: str | Iterable[str] | None = None,
issuer: str | None = None,
leeway: float | timedelta = 0,
# kwargs
**kwargs: Any,
) -> Any:
if kwargs:
warnings.warn(
"passing additional kwargs to decode() is deprecated "
"and will be removed in pyjwt version 3. "
f"Unsupported kwargs: {tuple(kwargs.keys())}",
RemovedInPyjwt3Warning,
)
decoded = self.decode_complete(
jwt,
key,
algorithms,
options,
verify=verify,
detached_payload=detached_payload,
audience=audience,
issuer=issuer,
leeway=leeway,
)
return decoded["payload"]
def _validate_claims(
self,
payload: dict[str, Any],
options: dict[str, Any],
audience=None,
issuer=None,
leeway: float | timedelta = 0,
) -> None:
if isinstance(leeway, timedelta):
leeway = leeway.total_seconds()
if audience is not None and not isinstance(audience, (str, Iterable)):
raise TypeError("audience must be a string, iterable or None")
self._validate_required_claims(payload, options)
now = datetime.now(tz=timezone.utc).timestamp()
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, strict=options.get("strict_aud", False)
)
def _validate_required_claims(
self,
payload: dict[str, Any],
options: dict[str, Any],
) -> None:
for claim in options["require"]:
if payload.get(claim) is None:
raise MissingRequiredClaimError(claim)
def _validate_iat(
self,
payload: dict[str, Any],
now: float,
leeway: float,
) -> None:
try:
iat = int(payload["iat"])
except ValueError:
raise InvalidIssuedAtError("Issued At claim (iat) must be an integer.")
if iat > (now + leeway):
raise ImmatureSignatureError("The token is not yet valid (iat)")
def _validate_nbf(
self,
payload: dict[str, Any],
now: float,
leeway: float,
) -> None:
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: dict[str, Any],
now: float,
leeway: float,
) -> None:
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: dict[str, Any],
audience: str | Iterable[str] | None,
*,
strict: bool = False,
) -> None:
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"]
# In strict mode, we forbid list matching: the supplied audience
# must be a string, and it must exactly match the audience claim.
if strict:
# Only a single audience is allowed in strict mode.
if not isinstance(audience, str):
raise InvalidAudienceError("Invalid audience (strict)")
# Only a single audience claim is allowed in strict mode.
if not isinstance(audience_claims, str):
raise InvalidAudienceError("Invalid claim format in token (strict)")
if audience != audience_claims:
raise InvalidAudienceError("Audience doesn't match (strict)")
return
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("Audience doesn't match")
def _validate_iss(self, payload: dict[str, Any], issuer: Any) -> None:
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