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from __future__ import annotations
import typing as t
from datetime import datetime
class BadData(Exception):
"""Raised if bad data of any sort was encountered. This is the base
for all exceptions that ItsDangerous defines.
.. versionadded:: 0.15
"""
def __init__(self, message: str):
super().__init__(message)
self.message = message
def __str__(self) -> str:
return self.message
class BadSignature(BadData):
"""Raised if a signature does not match."""
def __init__(self, message: str, payload: t.Any | None = None):
super().__init__(message)
#: The payload that failed the signature test. In some
#: situations you might still want to inspect this, even if
#: you know it was tampered with.
#:
#: .. versionadded:: 0.14
self.payload: t.Any | None = payload
class BadTimeSignature(BadSignature):
"""Raised if a time-based signature is invalid. This is a subclass
of :class:`BadSignature`.
"""
def __init__(
self,
message: str,
payload: t.Any | None = None,
date_signed: datetime | None = None,
):
super().__init__(message, payload)
#: If the signature expired this exposes the date of when the
#: signature was created. This can be helpful in order to
#: tell the user how long a link has been gone stale.
#:
#: .. versionchanged:: 2.0
#: The datetime value is timezone-aware rather than naive.
#:
#: .. versionadded:: 0.14
self.date_signed = date_signed
class SignatureExpired(BadTimeSignature):
"""Raised if a signature timestamp is older than ``max_age``. This
is a subclass of :exc:`BadTimeSignature`.
"""
class BadHeader(BadSignature):
"""Raised if a signed header is invalid in some form. This only
happens for serializers that have a header that goes with the
signature.
.. versionadded:: 0.24
"""
def __init__(
self,
message: str,
payload: t.Any | None = None,
header: t.Any | None = None,
original_error: Exception | None = None,
):
super().__init__(message, payload)
#: If the header is actually available but just malformed it
#: might be stored here.
self.header: t.Any | None = header
#: If available, the error that indicates why the payload was
#: not valid. This might be ``None``.
self.original_error: Exception | None = original_error
class BadPayload(BadData):
"""Raised if a payload is invalid. This could happen if the payload
is loaded despite an invalid signature, or if there is a mismatch
between the serializer and deserializer. The original exception
that occurred during loading is stored on as :attr:`original_error`.
.. versionadded:: 0.15
"""
def __init__(self, message: str, original_error: Exception | None = None):
super().__init__(message)
#: If available, the error that indicates why the payload was
#: not valid. This might be ``None``.
self.original_error: Exception | None = original_error