• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1# Copyright (C) 2001-2006 Python Software Foundation
2# Author: Barry Warsaw
3# Contact: email-sig@python.org
4
5"""email package exception classes."""
6
7
8class MessageError(Exception):
9    """Base class for errors in the email package."""
10
11
12class MessageParseError(MessageError):
13    """Base class for message parsing errors."""
14
15
16class HeaderParseError(MessageParseError):
17    """Error while parsing headers."""
18
19
20class BoundaryError(MessageParseError):
21    """Couldn't find terminating boundary."""
22
23
24class MultipartConversionError(MessageError, TypeError):
25    """Conversion to a multipart is prohibited."""
26
27
28class CharsetError(MessageError):
29    """An illegal charset was given."""
30
31
32class HeaderWriteError(MessageError):
33    """Error while writing headers."""
34
35
36# These are parsing defects which the parser was able to work around.
37class MessageDefect(ValueError):
38    """Base class for a message defect."""
39
40    def __init__(self, line=None):
41        if line is not None:
42            super().__init__(line)
43        self.line = line
44
45class NoBoundaryInMultipartDefect(MessageDefect):
46    """A message claimed to be a multipart but had no boundary parameter."""
47
48class StartBoundaryNotFoundDefect(MessageDefect):
49    """The claimed start boundary was never found."""
50
51class CloseBoundaryNotFoundDefect(MessageDefect):
52    """A start boundary was found, but not the corresponding close boundary."""
53
54class FirstHeaderLineIsContinuationDefect(MessageDefect):
55    """A message had a continuation line as its first header line."""
56
57class MisplacedEnvelopeHeaderDefect(MessageDefect):
58    """A 'Unix-from' header was found in the middle of a header block."""
59
60class MissingHeaderBodySeparatorDefect(MessageDefect):
61    """Found line with no leading whitespace and no colon before blank line."""
62# XXX: backward compatibility, just in case (it was never emitted).
63MalformedHeaderDefect = MissingHeaderBodySeparatorDefect
64
65class MultipartInvariantViolationDefect(MessageDefect):
66    """A message claimed to be a multipart but no subparts were found."""
67
68class InvalidMultipartContentTransferEncodingDefect(MessageDefect):
69    """An invalid content transfer encoding was set on the multipart itself."""
70
71class UndecodableBytesDefect(MessageDefect):
72    """Header contained bytes that could not be decoded"""
73
74class InvalidBase64PaddingDefect(MessageDefect):
75    """base64 encoded sequence had an incorrect length"""
76
77class InvalidBase64CharactersDefect(MessageDefect):
78    """base64 encoded sequence had characters not in base64 alphabet"""
79
80class InvalidBase64LengthDefect(MessageDefect):
81    """base64 encoded sequence had invalid length (1 mod 4)"""
82
83# These errors are specific to header parsing.
84
85class HeaderDefect(MessageDefect):
86    """Base class for a header defect."""
87
88    def __init__(self, *args, **kw):
89        super().__init__(*args, **kw)
90
91class InvalidHeaderDefect(HeaderDefect):
92    """Header is not valid, message gives details."""
93
94class HeaderMissingRequiredValue(HeaderDefect):
95    """A header that must have a value had none"""
96
97class NonPrintableDefect(HeaderDefect):
98    """ASCII characters outside the ascii-printable range found"""
99
100    def __init__(self, non_printables):
101        super().__init__(non_printables)
102        self.non_printables = non_printables
103
104    def __str__(self):
105        return ("the following ASCII non-printables found in header: "
106            "{}".format(self.non_printables))
107
108class ObsoleteHeaderDefect(HeaderDefect):
109    """Header uses syntax declared obsolete by RFC 5322"""
110
111class NonASCIILocalPartDefect(HeaderDefect):
112    """local_part contains non-ASCII characters"""
113    # This defect only occurs during unicode parsing, not when
114    # parsing messages decoded from binary.
115
116class InvalidDateDefect(HeaderDefect):
117    """Header has unparsable or invalid date"""
118