Mini Shell

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.

import base64

from libcloud.common.base import JsonResponse
from libcloud.common.base import ConnectionUserAndKey
from libcloud.utils.py3 import b
from libcloud.common.types import ProviderError


__all__ = [
    'API_HOST',
    'LiquidWebException',
    'LiquidWebResponse',
    'LiquidWebConnection',
]


# Endpoint for liquidweb api.
API_HOST = 'api.stormondemand.com'


class LiquidWebException(ProviderError):
    """The base class for other Liquidweb exceptions"""

    def __init__(self, value, http_code, extra=None):
        """
        :param value: message contained in error
        :type  value: ``str``

        :param http_code: error code
        :type  http_code: ``int``

        :param extra: extra fields specific to error type
        :type  extra: ``list``
        """
        self.extra = extra
        super(LiquidWebException, self).__init__(value, http_code, driver=None)

    def __str__(self):
        return "%s  %s" % (self.http_code, self.value)

    def __repr__(self):
        return "LiquidWebException %s %s" % (self.http_code, self.value)


class APIException(LiquidWebException):

    def __init__(self, error_class, full_msg, http_code, extra=None):
        self.error_class = error_class
        super(APIException, self).__init__(full_msg, http_code, extra=extra)

    def __str__(self):
        return "%s: %s" % (self.error_class, self.value)

    def __repr__(self):
        return "%s: %s" % (self.error_class, self.value)


EXCEPTIONS_FIELDS = {
    'LW::Exception::API::Internal': {
        'fields': []
    },
    'LW::Exception::API::InvalidEncoding': {
        'fields': ['encoding']
    },
    'LW::Exception::API::InvalidMethod': {
        'fields': ['method']
    },
    'LW::Exception::API::Maintenance': {
        'fields': []
    },
    'LW::Exception::API::RateLimit': {
        'fields': ['account', 'ip', 'method']
    },
    'LW::Exception::Authorization': {
        'fields': ['username']
    },
    'LW::Exception::DNS::NoResponse': {
        'fields': ['nameservers']
    },
    'LW::Exception::DNS::Servfail': {
        'fields': ['nameservers']
    },
    'LW::Exception::Deserialize': {
        'fields': ['data', 'encoding']
    },
    'LW::Exception::DuplicateRecord': {
        'fields': ['field', 'input', 'statement']
    },
    'LW::Exception::Forbidden': {
        'fields': []
    },
    'LW::Exception::Incapable': {
        'fields': ['capability', 'thing']
    },
    'LW::Exception::Input': {
        'fields': ['field']
    },
    'LW::Exception::Input::Disallowed': {
        'fields': ['field']
    },
    'LW::Exception::Input::Multiple': {
        'fields': ['errors', 'field', 'type']
    },
    'LW::Exception::Input::NotInRealm': {
        'fields': ['field', 'valid', 'value']
    },
    'LW::Exception::Input::OutOfBounds': {
        'fields': ['field', 'max', 'min', 'value']
    },
    'LW::Exception::Input::Required': {
        'fields': ['field', 'position']
    },
    'LW::Exception::Input::Unknown': {
        'fields': ['field', 'value']
    },
    'LW::Exception::Input::Validation': {
        'fields': ['field', 'type', 'value']
    },
    'LW::Exception::Permission': {
        'fields': ['account', 'identifier']
    },
    'LW::Exception::RecordNotFound': {
        'fields': ['field', 'input']
    },
    'LW::Exception::RemoteService::Authorization': {
        'fields': ['url']
    },
    'LW::Exception::Resource': {
        'fields': ['resource']
    },
    'LW::Exception::Resource::Insufficient': {
        'fields': ['available', 'requested', 'resource']
    },
    'LW::Exception::Resource::Unavailable': {
        'fields': ['resource']
    },
    'LW::Exception::Serialize': {
        'fields': ['data', 'encoding']
    },
    'LW::Exception::Workflow::Conflict': {
        'fields': ['conflict', 'workflow']
    }
}


class LiquidWebResponse(JsonResponse):
    objects = None
    errors = None

    def __init__(self, response, connection):
        self.errors = []
        super(LiquidWebResponse, self).__init__(response=response,
                                                connection=connection)
        self.objects, self.errors = self.parse_body_and_errors()
        if self.errors:
            error = self.errors.pop()
            raise self._make_excp(error, self.status)

    def parse_body_and_errors(self):
        data = []
        errors = []
        js = super(LiquidWebResponse, self).parse_body()
        if 'items' in js:
            data.append(js['items'])

        if 'name' in js:
            data.append(js)

        if 'deleted' in js:
            data.append(js['deleted'])

        if 'error_class' in js:
            errors.append(js)

        return (data, errors)

    def success(self):
        """
        Returns ``True`` if our request is successful.
        """
        return (len(self.errors) == 0)

    def _make_excp(self, error, status):
        """
        Raise LiquidWebException.
        """
        exc_type = error.get('error_class')
        message = error.get('full_message')
        try:
            _type = EXCEPTIONS_FIELDS[exc_type]
            fields = _type.get('fields')
            extra = {}
        except KeyError:
            fields = []

        for field in fields:
            extra[field] = error.get(field)
        return APIException(exc_type, message, status, extra=extra)


class LiquidWebConnection(ConnectionUserAndKey):
    host = API_HOST
    responseCls = LiquidWebResponse

    def add_default_headers(self, headers):
        b64string = b('%s:%s' % (self.user_id, self.key))
        encoded = base64.b64encode(b64string).decode('utf-8')
        authorization = 'Basic ' + encoded

        headers['Authorization'] = authorization
        headers['Content-Type'] = 'application/json'

        return headers