# 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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class HeaderWriteError(MessageError):

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"""Error while writing headers."""

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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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