# Copyright (C) 2001-2006 Python Software Foundation
# Author: Barry Warsaw
# Contact: [email protected]

"""email package exception classes."""


class MessageError(Exception):
"""Base class for errors in the email package."""


class MessageParseError(MessageError):
"""Base class for message parsing errors."""


class HeaderParseError(MessageParseError):
"""Error while parsing headers."""


class BoundaryError(MessageParseError):
"""Couldn't find terminating boundary."""


class MultipartConversionError(MessageError, TypeError):
"""Conversion to a multipart is prohibited."""


class CharsetError(MessageError):
"""An illegal charset was given."""


# These are parsing defects which the parser was able to work around.
class MessageDefect(ValueError):
"""Base class for a message defect."""

def __init__(self, line=None):
if line is not None:
super().__init__(line)
self.line = line

class NoBoundaryInMultipartDefect(MessageDefect):
"""A message claimed to be a multipart but had no boundary parameter."""

class StartBoundaryNotFoundDefect(MessageDefect):
"""The claimed start boundary was never found."""

class CloseBoundaryNotFoundDefect(MessageDefect):
"""A start boundary was found, but not the corresponding close boundary."""

class FirstHeaderLineIsContinuationDefect(MessageDefect):
"""A message had a continuation line as its first header line."""

class MisplacedEnvelopeHeaderDefect(MessageDefect):
"""A 'Unix-from' header was found in the middle of a header block."""

class MissingHeaderBodySeparatorDefect(MessageDefect):
"""Found line with no leading whitespace and no colon before blank line."""
# XXX: backward compatibility, just in case (it was never emitted).
MalformedHeaderDefect = MissingHeaderBodySeparatorDefect

class MultipartInvariantViolationDefect(MessageDefect):
"""A message claimed to be a multipart but no subparts were found."""

class InvalidMultipartContentTransferEncodingDefect(MessageDefect):
"""An invalid content transfer encoding was set on the multipart itself."""

class UndecodableBytesDefect(MessageDefect):
"""Header contained bytes that could not be decoded"""

class InvalidBase64PaddingDefect(MessageDefect):
"""base64 encoded sequence had an incorrect length"""

class InvalidBase64CharactersDefect(MessageDefect):
"""base64 encoded sequence had characters not in base64 alphabet"""

# These errors are specific to header parsing.

class HeaderDefect(MessageDefect):
"""Base class for a header defect."""

def __init__(self, *args, **kw):
super().__init__(*args, **kw)

class InvalidHeaderDefect(HeaderDefect):
"""Header is not valid, message gives details."""

class HeaderMissingRequiredValue(HeaderDefect):
"""A header that must have a value had none"""

class NonPrintableDefect(HeaderDefect):
"""ASCII characters outside the ascii-printable range found"""

def __init__(self, non_printables):
super().__init__(non_printables)
self.non_printables = non_printables

def __str__(self):
return ("the following ASCII non-printables found in header: "
"{}".format(self.non_printables))

class ObsoleteHeaderDefect(HeaderDefect):
"""Header uses syntax declared obsolete by RFC 5322"""

class NonASCIILocalPartDefect(HeaderDefect):
"""local_part contains non-ASCII characters"""
# This defect only occurs during unicode parsing, not when
# parsing messages decoded from binary.