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/usr/lib/python3/dist-packages/jwt/

Edit File: api_jws.py

from __future__ import annotations

import binascii
import json
import warnings
from typing import TYPE_CHECKING, Any

from .algorithms import (
    Algorithm,
    get_default_algorithms,
    has_crypto,
    requires_cryptography,
)
from .exceptions import (
    DecodeError,
    InvalidAlgorithmError,
    InvalidSignatureError,
    InvalidTokenError,
)
from .utils import base64url_decode, base64url_encode
from .warnings import RemovedInPyjwt3Warning

if TYPE_CHECKING:
    from .algorithms import AllowedPrivateKeys, AllowedPublicKeys

class PyJWS:
    header_typ = "JWT"

def __init__(
        self,
        algorithms: list[str] | None = None,
        options: dict[str, Any] | None = None,
    ) -> None:
        self._algorithms = get_default_algorithms()
        self._valid_algs = (
            set(algorithms) if algorithms is not None else set(self._algorithms)
        )

# Remove algorithms that aren't on the whitelist
        for key in list(self._algorithms.keys()):
            if key not in self._valid_algs:
                del self._algorithms[key]

if options is None:
            options = {}
        self.options = {**self._get_default_options(), **options}

@staticmethod
    def _get_default_options() -> dict[str, bool]:
        return {"verify_signature": True}

def register_algorithm(self, alg_id: str, alg_obj: Algorithm) -> None:
        """
        Registers a new Algorithm for use when creating and verifying tokens.
        """
        if alg_id in self._algorithms:
            raise ValueError("Algorithm already has a handler.")

if not isinstance(alg_obj, Algorithm):
            raise TypeError("Object is not of type `Algorithm`")

self._algorithms[alg_id] = alg_obj
        self._valid_algs.add(alg_id)

def unregister_algorithm(self, alg_id: str) -> None:
        """
        Unregisters an Algorithm for use when creating and verifying tokens
        Throws KeyError if algorithm is not registered.
        """
        if alg_id not in self._algorithms:
            raise KeyError(
                "The specified algorithm could not be removed"
                " because it is not registered."
            )

del self._algorithms[alg_id]
        self._valid_algs.remove(alg_id)

def get_algorithms(self) -> list[str]:
        """
        Returns a list of supported values for the 'alg' parameter.
        """
        return list(self._valid_algs)

def get_algorithm_by_name(self, alg_name: str) -> Algorithm:
        """
        For a given string name, return the matching Algorithm object.

Example usage:

>>> jws_obj.get_algorithm_by_name("RS256")
        """
        try:
            return self._algorithms[alg_name]
        except KeyError as e:
            if not has_crypto and alg_name in requires_cryptography:
                raise NotImplementedError(
                    f"Algorithm '{alg_name}' could not be found. Do you have cryptography installed?"
                ) from e
            raise NotImplementedError("Algorithm not supported") from e

def encode(
        self,
        payload: bytes,
        key: AllowedPrivateKeys | str | bytes,
        algorithm: str | None = "HS256",
        headers: dict[str, Any] | None = None,
        json_encoder: type[json.JSONEncoder] | None = None,
        is_payload_detached: bool = False,
        sort_headers: bool = True,
    ) -> str:
        segments = []

# declare a new var to narrow the type for type checkers
        algorithm_: str = algorithm if algorithm is not None else "none"

# Prefer headers values if present to function parameters.
        if headers:
            headers_alg = headers.get("alg")
            if headers_alg:
                algorithm_ = headers["alg"]

headers_b64 = headers.get("b64")
            if headers_b64 is False:
                is_payload_detached = True

# Header
        header: dict[str, Any] = {"typ": self.header_typ, "alg": algorithm_}

if headers:
            self._validate_headers(headers, encoding=True)
            header.update(headers)

if not header["typ"]:
            del header["typ"]

if is_payload_detached:
            header["b64"] = False
        elif "b64" in header:
            # True is the standard value for b64, so no need for it
            del header["b64"]

json_header = json.dumps(
            header, separators=(",", ":"), cls=json_encoder, sort_keys=sort_headers
        ).encode()

segments.append(base64url_encode(json_header))

if is_payload_detached:
            msg_payload = payload
        else:
            msg_payload = base64url_encode(payload)
        segments.append(msg_payload)

# Segments
        signing_input = b".".join(segments)

alg_obj = self.get_algorithm_by_name(algorithm_)
        key = alg_obj.prepare_key(key)
        signature = alg_obj.sign(signing_input, key)

segments.append(base64url_encode(signature))

# Don't put the payload content inside the encoded token when detached
        if is_payload_detached:
            segments[1] = b""
        encoded_string = b".".join(segments)

return encoded_string.decode("utf-8")

def decode_complete(
        self,
        jwt: str | bytes,
        key: AllowedPublicKeys | str | bytes = "",
        algorithms: list[str] | None = None,
        options: dict[str, Any] | None = None,
        detached_payload: bytes | None = None,
        **kwargs,
    ) -> 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,
            )
        if options is None:
            options = {}
        merged_options = {**self.options, **options}
        verify_signature = merged_options["verify_signature"]

if verify_signature and not algorithms:
            raise DecodeError(
                'It is required that you pass in a value for the "algorithms" argument when calling decode().'
            )

payload, signing_input, header, signature = self._load(jwt)

self._validate_headers(header)

if header.get("b64", True) is False:
            if detached_payload is None:
                raise DecodeError(
                    'It is required that you pass in a value for the "detached_payload" argument to decode a message having the b64 header set to false.'
                )
            payload = detached_payload
            signing_input = b".".join([signing_input.rsplit(b".", 1)[0], payload])

if verify_signature:
            self._verify_signature(signing_input, header, signature, key, algorithms)

return {
            "payload": payload,
            "header": header,
            "signature": signature,
        }

def decode(
        self,
        jwt: str | bytes,
        key: AllowedPublicKeys | str | bytes = "",
        algorithms: list[str] | None = None,
        options: dict[str, Any] | None = None,
        detached_payload: bytes | None = None,
        **kwargs,
    ) -> 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, detached_payload=detached_payload
        )
        return decoded["payload"]

def get_unverified_header(self, jwt: str | bytes) -> dict[str, Any]:
        """Returns back the JWT header parameters as a dict()

Note: The signature is not verified so the header parameters
        should not be fully trusted until signature verification is complete
        """
        headers = self._load(jwt)[2]
        self._validate_headers(headers)

return headers

def _load(self, jwt: str | bytes) -> tuple[bytes, bytes, dict[str, Any], bytes]:
        if isinstance(jwt, str):
            jwt = jwt.encode("utf-8")

if not isinstance(jwt, bytes):
            raise DecodeError(f"Invalid token type. Token must be a {bytes}")

try:
            signing_input, crypto_segment = jwt.rsplit(b".", 1)
            header_segment, payload_segment = signing_input.split(b".", 1)
        except ValueError as err:
            raise DecodeError("Not enough segments") from err

try:
            header_data = base64url_decode(header_segment)
        except (TypeError, binascii.Error) as err:
            raise DecodeError("Invalid header padding") from err

try:
            header = json.loads(header_data)
        except ValueError as e:
            raise DecodeError(f"Invalid header string: {e}") from e

if not isinstance(header, dict):
            raise DecodeError("Invalid header string: must be a json object")

try:
            payload = base64url_decode(payload_segment)
        except (TypeError, binascii.Error) as err:
            raise DecodeError("Invalid payload padding") from err

try:
            signature = base64url_decode(crypto_segment)
        except (TypeError, binascii.Error) as err:
            raise DecodeError("Invalid crypto padding") from err

return (payload, signing_input, header, signature)

def _verify_signature(
        self,
        signing_input: bytes,
        header: dict[str, Any],
        signature: bytes,
        key: AllowedPublicKeys | str | bytes = "",
        algorithms: list[str] | None = None,
    ) -> None:
        try:
            alg = header["alg"]
        except KeyError:
            raise InvalidAlgorithmError("Algorithm not specified")

if not alg or (algorithms is not None and alg not in algorithms):
            raise InvalidAlgorithmError("The specified alg value is not allowed")

try:
            alg_obj = self.get_algorithm_by_name(alg)
        except NotImplementedError as e:
            raise InvalidAlgorithmError("Algorithm not supported") from e
        prepared_key = alg_obj.prepare_key(key)

if not alg_obj.verify(signing_input, prepared_key, signature):
            raise InvalidSignatureError("Signature verification failed")

# Extensions that PyJWT actually understands and supports
    _supported_crit: set[str] = {"b64"}

def _validate_headers(
        self, headers: dict[str, Any], *, encoding: bool = False
    ) -> None:
        if "kid" in headers:
            self._validate_kid(headers["kid"])
        if not encoding and "crit" in headers:
            self._validate_crit(headers)

def _validate_kid(self, kid: Any) -> None:
        if not isinstance(kid, str):
            raise InvalidTokenError("Key ID header parameter must be a string")

def _validate_crit(self, headers: dict[str, Any]) -> None:
        crit = headers["crit"]
        if not isinstance(crit, list) or len(crit) == 0:
            raise InvalidTokenError("Invalid 'crit' header: must be a non-empty list")
        for ext in crit:
            if not isinstance(ext, str):
                raise InvalidTokenError("Invalid 'crit' header: values must be strings")
            if ext not in self._supported_crit:
                raise InvalidTokenError(f"Unsupported critical extension: {ext}")
            if ext not in headers:
                raise InvalidTokenError(
                    f"Critical extension '{ext}' is missing from headers"
                )

_jws_global_obj = PyJWS()
encode = _jws_global_obj.encode
decode_complete = _jws_global_obj.decode_complete
decode = _jws_global_obj.decode
register_algorithm = _jws_global_obj.register_algorithm
unregister_algorithm = _jws_global_obj.unregister_algorithm
get_algorithm_by_name = _jws_global_obj.get_algorithm_by_name
get_unverified_header = _jws_global_obj.get_unverified_header

Cancel

Listing directory:

Name	Size	Modify	Owner/Group	Perms	Action	Select
__init__.py	1.57 KB	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
__pycache__	DIR	01.05.2026 06:36:11	0/0	drwxr-xr-x	Edit Rename
algorithms.py	29.1 KB	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
api_jwk.py	4.1 KB	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
api_jws.py	11.79 KB	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
api_jwt.py	11.55 KB	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
exceptions.py	1.02 KB	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
help.py	1.71 KB	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
jwk_set_cache.py	959 B	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
jwks_client.py	3.96 KB	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
py.typed	0 B	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
types.py	99 B	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
utils.py	3.81 KB	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download
warnings.py	59 B	26.03.2026 13:14:41	0/0	-rw-r--r--	Edit Rename Download

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