{-# LANGUAGE DataKinds                   #-}
{-# LANGUAGE DeriveGeneric               #-}
{-# LANGUAGE FlexibleInstances           #-}
{-# LANGUAGE GeneralizedNewtypeDeriving  #-}
{-# LANGUAGE LambdaCase                  #-}
{-# LANGUAGE NoImplicitPrelude           #-}
{-# LANGUAGE OverloadedStrings           #-}
{-# LANGUAGE RecordWildCards             #-}
{-# LANGUAGE TypeFamilies                #-}

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

-- Module      : Network.AWS.OpsWorks.DescribePermissions
-- Copyright   : (c) 2013-2014 Brendan Hay <brendan.g.hay@gmail.com>
-- License     : This Source Code Form is subject to the terms of
--               the Mozilla Public License, v. 2.0.
--               A copy of the MPL can be found in the LICENSE file or
--               you can obtain it at http://mozilla.org/MPL/2.0/.
-- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
-- Stability   : experimental
-- Portability : non-portable (GHC extensions)
--
-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- | Describes the permissions for a specified stack.
--
-- Required Permissions: To use this action, an IAM user must have a Manage
-- permissions level for the stack, or an attached policy that explicitly grants
-- permissions. For more information on user permissions, see <http://docs.aws.amazon.com/opsworks/latest/userguide/opsworks-security-users.html Managing UserPermissions>.
--
-- <http://docs.aws.amazon.com/opsworks/latest/APIReference/API_DescribePermissions.html>
module Network.AWS.OpsWorks.DescribePermissions
    (
    -- * Request
      DescribePermissions
    -- ** Request constructor
    , describePermissions
    -- ** Request lenses
    , dpIamUserArn
    , dpStackId

    -- * Response
    , DescribePermissionsResponse
    -- ** Response constructor
    , describePermissionsResponse
    -- ** Response lenses
    , dprPermissions
    ) where

import Network.AWS.Data (Object)
import Network.AWS.Prelude
import Network.AWS.Request.JSON
import Network.AWS.OpsWorks.Types
import qualified GHC.Exts

data DescribePermissions = DescribePermissions
    { _dpIamUserArn :: Maybe Text
    , _dpStackId    :: Maybe Text
    } deriving (Eq, Ord, Read, Show)

-- | 'DescribePermissions' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'dpIamUserArn' @::@ 'Maybe' 'Text'
--
-- * 'dpStackId' @::@ 'Maybe' 'Text'
--
describePermissions :: DescribePermissions
describePermissions = DescribePermissions
    { _dpIamUserArn = Nothing
    , _dpStackId    = Nothing
    }

-- | The user's IAM ARN. For more information about IAM ARNs, see <http://docs.aws.amazon.com/IAM/latest/UserGuide/Using_Identifiers.html Using Identifiers>
-- .
dpIamUserArn :: Lens' DescribePermissions (Maybe Text)
dpIamUserArn = lens _dpIamUserArn (\s a -> s { _dpIamUserArn = a })

-- | The stack ID.
dpStackId :: Lens' DescribePermissions (Maybe Text)
dpStackId = lens _dpStackId (\s a -> s { _dpStackId = a })

newtype DescribePermissionsResponse = DescribePermissionsResponse
    { _dprPermissions :: List "Permissions" Permission
    } deriving (Eq, Read, Show, Monoid, Semigroup)

instance GHC.Exts.IsList DescribePermissionsResponse where
    type Item DescribePermissionsResponse = Permission

    fromList = DescribePermissionsResponse . GHC.Exts.fromList
    toList   = GHC.Exts.toList . _dprPermissions

-- | 'DescribePermissionsResponse' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'dprPermissions' @::@ ['Permission']
--
describePermissionsResponse :: DescribePermissionsResponse
describePermissionsResponse = DescribePermissionsResponse
    { _dprPermissions = mempty
    }

-- | An array of 'Permission' objects that describe the stack permissions.
--
-- If the request object contains only a stack ID, the array contains a 'Permission' object with permissions for each of the stack IAM ARNs. If the request
-- object contains only an IAM ARN, the array contains a 'Permission' object with
-- permissions for each of the user's stack IDs. If the request contains a stack
-- ID and an IAM ARN, the array contains a single 'Permission' object with
-- permissions for the specified stack and IAM ARN.
dprPermissions :: Lens' DescribePermissionsResponse [Permission]
dprPermissions = lens _dprPermissions (\s a -> s { _dprPermissions = a }) . _List

instance ToPath DescribePermissions where
    toPath = const "/"

instance ToQuery DescribePermissions where
    toQuery = const mempty

instance ToHeaders DescribePermissions

instance ToJSON DescribePermissions where
    toJSON DescribePermissions{..} = object
        [ "IamUserArn" .= _dpIamUserArn
        , "StackId"    .= _dpStackId
        ]

instance AWSRequest DescribePermissions where
    type Sv DescribePermissions = OpsWorks
    type Rs DescribePermissions = DescribePermissionsResponse

    request  = post "DescribePermissions"
    response = jsonResponse

instance FromJSON DescribePermissionsResponse where
    parseJSON = withObject "DescribePermissionsResponse" $ \o -> DescribePermissionsResponse
        <$> o .:? "Permissions" .!= mempty
