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errors.py
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# Copyright (C) 2016-2017 g10 Code GmbH
# Copyright (C) 2004 Igor Belyi <belyi@users.sourceforge.net>
# Copyright (C) 2002 John Goerzen <jgoerzen@complete.org>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
from __future__ import absolute_import, print_function, unicode_literals
from . import gpgme
from . import util
del absolute_import, print_function, unicode_literals
# To appease static analysis tools, we define some constants here.
# They are overwritten with the proper values by process_constants.
NO_ERROR = None
EOF = None
util.process_constants('GPG_ERR_', globals())
del util
class GpgError(Exception):
"""A GPG Error
This is the base of all errors thrown by this library.
If the error originated from GPGME, then additional information
can be found by looking at 'code' for the error code, and 'source'
for the errors origin. Suitable constants for comparison are
defined in this module. 'code_str' and 'source_str' are
human-readable versions of the former two properties.
If 'context' is not None, then it contains a human-readable hint
as to where the error originated from.
If 'results' is not None, it is a tuple containing results of the
operation that failed. The tuples elements are the results of the
function that raised the error. Some operations return results
even though they signal an error. Of course this information must
be taken with a grain of salt. But often, this information is
useful for diagnostic uses or to give the user feedback. Since
the normal control flow is disrupted by the exception, the callee
can no longer return results, hence we attach them to the
exception objects.
"""
def __init__(self, error=None, context=None, results=None):
self.error = error
self.context = context
self.results = results
@property
def code(self):
if self.error is None:
return None
return gpgme.gpgme_err_code(self.error)
@property
def code_str(self):
if self.error is None:
return None
return gpgme.gpgme_strerror(self.error)
@property
def source(self):
if self.error is None:
return None
return gpgme.gpgme_err_source(self.error)
@property
def source_str(self):
if self.error is None:
return None
return gpgme.gpgme_strsource(self.error)
def __str__(self):
msgs = []
if self.context is not None:
msgs.append(self.context)
if self.error is not None:
msgs.append(self.source_str)
msgs.append(self.code_str)
return ': '.join(msgs)
class GPGMEError(GpgError):
'''Generic error
This is a generic error that wraps the underlying libraries native
error type. It is thrown when the low-level API is invoked and
returns an error. This is the error that was used in PyME.
'''
@classmethod
def fromSyserror(cls):
return cls(gpgme.gpgme_err_code_from_syserror())
@property
def message(self):
return self.context
def getstring(self):
return str(self)
def getcode(self):
return self.code
def getsource(self):
return self.source
def errorcheck(retval, extradata=None):
if retval:
raise GPGMEError(retval, extradata)
class KeyNotFound(GPGMEError, KeyError):
"""Raised if a key was not found
GPGME indicates this condition with EOF, which is not very
idiomatic. We raise this error that is both a GPGMEError
indicating EOF, and a KeyError.
"""
def __init__(self, keystr):
self.keystr = keystr
GPGMEError.__init__(self, EOF)
def __str__(self):
return self.keystr
# These errors are raised in the idiomatic interface code.
class EncryptionError(GpgError):
pass
class InvalidRecipients(EncryptionError):
def __init__(self, recipients, **kwargs):
EncryptionError.__init__(self, **kwargs)
self.recipients = recipients
def __str__(self):
return ", ".join("{}: {}".format(r.fpr, gpgme.gpgme_strerror(r.reason))
for r in self.recipients)
class DecryptionError(GpgError):
pass
class UnsupportedAlgorithm(DecryptionError):
def __init__(self, algorithm, **kwargs):
DecryptionError.__init__(self, **kwargs)
self.algorithm = algorithm
def __str__(self):
return self.algorithm
class SigningError(GpgError):
pass
class InvalidSigners(SigningError):
def __init__(self, signers, **kwargs):
SigningError.__init__(self, **kwargs)
self.signers = signers
def __str__(self):
return ", ".join("{}: {}".format(s.fpr, gpgme.gpgme_strerror(s.reason))
for s in self.signers)
class VerificationError(GpgError):
def __init__(self, result, **kwargs):
GpgError.__init__(self, **kwargs)
self.result = result
class BadSignatures(VerificationError):
def __str__(self):
return ", ".join("{}: {}".format(s.fpr, gpgme.gpgme_strerror(s.status))
for s in self.result.signatures
if s.status != NO_ERROR)
class MissingSignatures(VerificationError):
def __init__(self, result, missing, **kwargs):
VerificationError.__init__(self, result, **kwargs)
self.missing = missing
def __str__(self):
return ", ".join(k.subkeys[0].fpr for k in self.missing)

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