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