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c3f55be7dd
When attempting to base64-decode a payload of invalid length (1 mod 4), properly recognize and handle it. The given data will be returned as-is, i.e. not decoded, along with a new defect, InvalidBase64LengthDefect.
110 lines
3.6 KiB
Python
110 lines
3.6 KiB
Python
# Copyright (C) 2001-2006 Python Software Foundation
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# Author: Barry Warsaw
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# Contact: email-sig@python.org
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"""email package exception classes."""
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class MessageError(Exception):
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"""Base class for errors in the email package."""
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class MessageParseError(MessageError):
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"""Base class for message parsing errors."""
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class HeaderParseError(MessageParseError):
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"""Error while parsing headers."""
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class BoundaryError(MessageParseError):
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"""Couldn't find terminating boundary."""
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class MultipartConversionError(MessageError, TypeError):
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"""Conversion to a multipart is prohibited."""
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class CharsetError(MessageError):
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"""An illegal charset was given."""
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# These are parsing defects which the parser was able to work around.
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class MessageDefect(ValueError):
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"""Base class for a message defect."""
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def __init__(self, line=None):
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if line is not None:
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super().__init__(line)
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self.line = line
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class NoBoundaryInMultipartDefect(MessageDefect):
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"""A message claimed to be a multipart but had no boundary parameter."""
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class StartBoundaryNotFoundDefect(MessageDefect):
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"""The claimed start boundary was never found."""
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class CloseBoundaryNotFoundDefect(MessageDefect):
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"""A start boundary was found, but not the corresponding close boundary."""
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class FirstHeaderLineIsContinuationDefect(MessageDefect):
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"""A message had a continuation line as its first header line."""
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class MisplacedEnvelopeHeaderDefect(MessageDefect):
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"""A 'Unix-from' header was found in the middle of a header block."""
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class MissingHeaderBodySeparatorDefect(MessageDefect):
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"""Found line with no leading whitespace and no colon before blank line."""
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# XXX: backward compatibility, just in case (it was never emitted).
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MalformedHeaderDefect = MissingHeaderBodySeparatorDefect
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class MultipartInvariantViolationDefect(MessageDefect):
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"""A message claimed to be a multipart but no subparts were found."""
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class InvalidMultipartContentTransferEncodingDefect(MessageDefect):
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"""An invalid content transfer encoding was set on the multipart itself."""
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class UndecodableBytesDefect(MessageDefect):
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"""Header contained bytes that could not be decoded"""
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class InvalidBase64PaddingDefect(MessageDefect):
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"""base64 encoded sequence had an incorrect length"""
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class InvalidBase64CharactersDefect(MessageDefect):
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"""base64 encoded sequence had characters not in base64 alphabet"""
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class InvalidBase64LengthDefect(MessageDefect):
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"""base64 encoded sequence had invalid length (1 mod 4)"""
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# These errors are specific to header parsing.
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class HeaderDefect(MessageDefect):
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"""Base class for a header defect."""
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def __init__(self, *args, **kw):
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super().__init__(*args, **kw)
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class InvalidHeaderDefect(HeaderDefect):
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"""Header is not valid, message gives details."""
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class HeaderMissingRequiredValue(HeaderDefect):
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"""A header that must have a value had none"""
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class NonPrintableDefect(HeaderDefect):
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"""ASCII characters outside the ascii-printable range found"""
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def __init__(self, non_printables):
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super().__init__(non_printables)
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self.non_printables = non_printables
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def __str__(self):
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return ("the following ASCII non-printables found in header: "
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"{}".format(self.non_printables))
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class ObsoleteHeaderDefect(HeaderDefect):
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"""Header uses syntax declared obsolete by RFC 5322"""
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class NonASCIILocalPartDefect(HeaderDefect):
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"""local_part contains non-ASCII characters"""
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# This defect only occurs during unicode parsing, not when
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# parsing messages decoded from binary.
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