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# Copyright 2012 OpenStack LLC.

# All Rights Reserved.

#

# Licensed under the Apache License, Version 2.0 (the "License"); you may

# not use this file except in compliance with the License. You may obtain

# a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

# License for the specific language governing permissions and limitations

# under the License.

#

# vim: tabstop=4 shiftwidth=4 softtabstop=4

"""

Exception definitions.

"""

class CommandError(Exception):

pass

class AuthorizationFailure(Exception):

pass

class NoTokenLookupException(Exception):

"""This form of authentication does not support looking up

endpoints from an existing token."""

pass

class EndpointNotFound(Exception):

"""Could not find Service or Region in Service Catalog."""

pass

class UnsupportedVersion(Exception):

"""Indicates that the user is trying to use an unsupported

version of the API"""

pass

class ClientException(Exception):

"""

The base exception class for all exceptions this library raises.

"""

def __init__(self, code, message=None, details=None):

self.code = code

self.message = message or self.__class__.message

self.details = details

def __str__(self):

return "%s (HTTP %s)" % (self.message, self.code)

class BadRequest(ClientException):

"""

HTTP 400 - Bad request: you sent some malformed data.

"""

http_status = 400

message = "Bad request"

class Unauthorized(ClientException):

"""

HTTP 401 - Unauthorized: bad credentials.

"""

http_status = 401

message = "Unauthorized"

class Forbidden(ClientException):

"""

HTTP 403 - Forbidden: your credentials don't give you access to this

resource.

"""

http_status = 403

message = "Forbidden"

class NotFound(ClientException):

"""

HTTP 404 - Not found

"""

http_status = 404

message = "Not found"

class Conflict(ClientException):

"""

HTTP 409 - Conflict

"""

http_status = 409

message = "Conflict"

class OverLimit(ClientException):

"""

HTTP 413 - Over limit: you're over the API limits for this time period.

"""

http_status = 413

message = "Over limit"

# NotImplemented is a python keyword.

class HTTPNotImplemented(ClientException):

"""

HTTP 501 - Not Implemented: the server does not support this operation.

"""

http_status = 501

message = "Not Implemented"

# In Python 2.4 Exception is old-style and thus doesn't have a __subclasses__()

# so we can do this:

# _code_map = dict((c.http_status, c)

# for c in ClientException.__subclasses__())

#

# Instead, we have to hardcode it:

_code_map = dict((c.http_status, c) for c in [BadRequest, Unauthorized,

Forbidden, NotFound, OverLimit, HTTPNotImplemented])

def from_response(response, body):

"""

Return an instance of a ClientException or subclass

based on an httplib2 response.

Usage::

resp, body = http.request(...)

if resp.status != 200:

raise exception_from_response(resp, body)

"""

cls = _code_map.get(response.status, ClientException)

if body:

if hasattr(body, 'keys'):

error = body[body.keys()[0]]

message = error.get('message', None)

details = error.get('details', None)

else:

# If we didn't get back a properly formed error message we

# probably couldn't communicate with Keystone at all.

message = "Unable to communicate with image service: %s." % body

details = None

return cls(code=response.status, message=message, details=details)

else:

return cls(code=response.status)