{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric      #-}
{-# LANGUAGE OverloadedStrings  #-}
{-# LANGUAGE RecordWildCards    #-}
{-# LANGUAGE TypeFamilies       #-}

{-# OPTIONS_GHC -fno-warn-unused-imports #-}
{-# OPTIONS_GHC -fno-warn-unused-binds   #-}
{-# OPTIONS_GHC -fno-warn-unused-matches #-}

-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- |
-- Module      : Network.AWS.IAM.GetPolicy
-- Copyright   : (c) 2013-2018 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay <brendan.g.hay+amazonka@gmail.com>
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Retrieves information about the specified managed policy, including the policy's default version and the total number of IAM users, groups, and roles to which the policy is attached. To retrieve the list of the specific users, groups, and roles that the policy is attached to, use the 'ListEntitiesForPolicy' API. This API returns metadata about the policy. To retrieve the actual policy document for a specific version of the policy, use 'GetPolicyVersion' .
--
--
-- This API retrieves information about managed policies. To retrieve information about an inline policy that is embedded with an IAM user, group, or role, use the 'GetUserPolicy' , 'GetGroupPolicy' , or 'GetRolePolicy' API.
--
-- For more information about policies, see <http://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-vs-inline.html Managed Policies and Inline Policies> in the /IAM User Guide/ .
--
module Network.AWS.IAM.GetPolicy
    (
    -- * Creating a Request
      getPolicy
    , GetPolicy
    -- * Request Lenses
    , gpPolicyARN

    -- * Destructuring the Response
    , getPolicyResponse
    , GetPolicyResponse
    -- * Response Lenses
    , gprsPolicy
    , gprsResponseStatus
    ) where

import Network.AWS.IAM.Types
import Network.AWS.IAM.Types.Product
import Network.AWS.Lens
import Network.AWS.Prelude
import Network.AWS.Request
import Network.AWS.Response

-- | /See:/ 'getPolicy' smart constructor.
newtype GetPolicy = GetPolicy'
  { _gpPolicyARN :: Text
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'GetPolicy' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'gpPolicyARN' - The Amazon Resource Name (ARN) of the managed policy that you want information about. For more information about ARNs, see <http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html Amazon Resource Names (ARNs) and AWS Service Namespaces> in the /AWS General Reference/ .
getPolicy
    :: Text -- ^ 'gpPolicyARN'
    -> GetPolicy
getPolicy pPolicyARN_ = GetPolicy' {_gpPolicyARN = pPolicyARN_}


-- | The Amazon Resource Name (ARN) of the managed policy that you want information about. For more information about ARNs, see <http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html Amazon Resource Names (ARNs) and AWS Service Namespaces> in the /AWS General Reference/ .
gpPolicyARN :: Lens' GetPolicy Text
gpPolicyARN = lens _gpPolicyARN (\ s a -> s{_gpPolicyARN = a})

instance AWSRequest GetPolicy where
        type Rs GetPolicy = GetPolicyResponse
        request = postQuery iam
        response
          = receiveXMLWrapper "GetPolicyResult"
              (\ s h x ->
                 GetPolicyResponse' <$>
                   (x .@? "Policy") <*> (pure (fromEnum s)))

instance Hashable GetPolicy where

instance NFData GetPolicy where

instance ToHeaders GetPolicy where
        toHeaders = const mempty

instance ToPath GetPolicy where
        toPath = const "/"

instance ToQuery GetPolicy where
        toQuery GetPolicy'{..}
          = mconcat
              ["Action" =: ("GetPolicy" :: ByteString),
               "Version" =: ("2010-05-08" :: ByteString),
               "PolicyArn" =: _gpPolicyARN]

-- | Contains the response to a successful 'GetPolicy' request.
--
--
--
-- /See:/ 'getPolicyResponse' smart constructor.
data GetPolicyResponse = GetPolicyResponse'
  { _gprsPolicy         :: !(Maybe Policy)
  , _gprsResponseStatus :: !Int
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'GetPolicyResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'gprsPolicy' - A structure containing details about the policy.
--
-- * 'gprsResponseStatus' - -- | The response status code.
getPolicyResponse
    :: Int -- ^ 'gprsResponseStatus'
    -> GetPolicyResponse
getPolicyResponse pResponseStatus_ =
  GetPolicyResponse'
    {_gprsPolicy = Nothing, _gprsResponseStatus = pResponseStatus_}


-- | A structure containing details about the policy.
gprsPolicy :: Lens' GetPolicyResponse (Maybe Policy)
gprsPolicy = lens _gprsPolicy (\ s a -> s{_gprsPolicy = a})

-- | -- | The response status code.
gprsResponseStatus :: Lens' GetPolicyResponse Int
gprsResponseStatus = lens _gprsResponseStatus (\ s a -> s{_gprsResponseStatus = a})

instance NFData GetPolicyResponse where