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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

Youez - 2016 - github.com/yon3zu
LinuXploit