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Filename : cloudstack.py
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# 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 copy
import hmac
import base64
import hashlib

from libcloud.utils.py3 import b, httplib, urlquote, urlencode
from libcloud.common.base import JsonResponse, PollingConnection, ConnectionUserAndKey
from libcloud.common.types import ProviderError, MalformedResponseError
from libcloud.compute.types import InvalidCredsError


class CloudStackResponse(JsonResponse):
    def parse_error(self):
        if self.status == httplib.UNAUTHORIZED:
            raise InvalidCredsError("Invalid provider credentials")

        value = None
        body = self.parse_body()
        if hasattr(body, "values"):
            values = list(body.values())[0]
            if "errortext" in values:
                value = values["errortext"]
        if value is None:
            value = self.body

        if not value:
            value = "WARNING: error message text sent by provider was empty."

        error = ProviderError(value=value, http_code=self.status, driver=self.connection.driver)
        raise error


class CloudStackConnection(ConnectionUserAndKey, PollingConnection):
    responseCls = CloudStackResponse
    poll_interval = 1
    request_method = "_sync_request"
    timeout = 600

    ASYNC_PENDING = 0
    ASYNC_SUCCESS = 1
    ASYNC_FAILURE = 2

    def encode_data(self, data):
        """
        Must of the data is sent as part of query params (eeww),
        but in newer versions, userdata argument can be sent as a
        urlencoded data in the request body.
        """
        if data:
            data = urlencode(data)

        return data

    def _make_signature(self, params):
        signature = [(k.lower(), v) for k, v in list(params.items())]
        signature.sort(key=lambda x: x[0])

        pairs = []
        for pair in signature:
            key = urlquote(str(pair[0]), safe="[]")
            value = urlquote(str(pair[1]), safe="[]*")
            item = "{}={}".format(key, value)
            pairs.append(item)

        signature = "&".join(pairs)

        signature = signature.lower().replace("+", "%20")
        signature = hmac.new(b(self.key), msg=b(signature), digestmod=hashlib.sha1)
        return base64.b64encode(b(signature.digest()))

    def add_default_params(self, params):
        params["apiKey"] = self.user_id
        params["response"] = "json"

        return params

    def pre_connect_hook(self, params, headers):
        params["signature"] = self._make_signature(params)

        return params, headers

    def _async_request(
        self,
        command,
        action=None,
        params=None,
        data=None,
        headers=None,
        method="GET",
        context=None,
    ):
        if params:
            context = copy.deepcopy(params)
        else:
            context = {}

        # Command is specified as part of GET call
        context["command"] = command
        result = super().async_request(
            action=action,
            params=params,
            data=data,
            headers=headers,
            method=method,
            context=context,
        )
        return result["jobresult"]

    def get_request_kwargs(
        self, action, params=None, data="", headers=None, method="GET", context=None
    ):
        command = context["command"]
        request_kwargs = {
            "command": command,
            "action": action,
            "params": params,
            "data": data,
            "headers": headers,
            "method": method,
        }
        return request_kwargs

    def get_poll_request_kwargs(self, response, context, request_kwargs):
        job_id = response["jobid"]
        params = {"jobid": job_id}
        kwargs = {"command": "queryAsyncJobResult", "params": params}
        return kwargs

    def has_completed(self, response):
        status = response.get("jobstatus", self.ASYNC_PENDING)

        if status == self.ASYNC_FAILURE:
            msg = response.get("jobresult", {}).get("errortext", status)
            raise Exception(msg)

        return status == self.ASYNC_SUCCESS

    def _sync_request(
        self, command, action=None, params=None, data=None, headers=None, method="GET"
    ):
        """
        This method handles synchronous calls which are generally fast
        information retrieval requests and thus return 'quickly'.
        """
        # command is always sent as part of "command" query parameter
        if params:
            params = copy.deepcopy(params)
        else:
            params = {}

        params["command"] = command
        # pylint: disable=maybe-no-member
        result = self.request(
            action=self.driver.path,
            params=params,
            data=data,
            headers=headers,
            method=method,
        )

        command = command.lower()

        # Work around for older versions which don't return "response" suffix
        # in delete ingress rule response command name
        if (
            command == "revokesecuritygroupingress"
            and "revokesecuritygroupingressresponse" not in result.object
        ):
            command = command
        elif command == "restorevirtualmachine" and "restorevmresponse" in result.object:
            command = "restorevmresponse"
        else:
            command = command + "response"

        if command not in result.object:
            raise MalformedResponseError(
                "Unknown response format {}".format(command),
                body=result.body,
                driver=self.driver,
            )
        result = result.object[command]
        return result


class CloudStackDriverMixIn:
    host = None
    path = None

    connectionCls = CloudStackConnection

    def __init__(self, key, secret=None, secure=True, host=None, port=None):
        host = host or self.host
        super().__init__(key, secret, secure, host, port)

    def _sync_request(
        self, command, action=None, params=None, data=None, headers=None, method="GET"
    ):
        return self.connection._sync_request(  # pylint: disable=maybe-no-member
            command=command,
            action=action,
            params=params,
            data=data,
            headers=headers,
            method=method,
        )

    def _async_request(
        self,
        command,
        action=None,
        params=None,
        data=None,
        headers=None,
        method="GET",
        context=None,
    ):
        return self.connection._async_request(  # pylint: disable=maybe-no-member
            command=command,
            action=action,
            params=params,
            data=data,
            headers=headers,
            method=method,
            context=context,
        )