{-# 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.KMS.ListGrants
-- 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.

-- | List the grants for a specified key.
--
-- <http://docs.aws.amazon.com/kms/latest/APIReference/API_ListGrants.html>
module Network.AWS.KMS.ListGrants
    (
    -- * Request
      ListGrants
    -- ** Request constructor
    , listGrants
    -- ** Request lenses
    , lgKeyId
    , lgLimit
    , lgMarker

    -- * Response
    , ListGrantsResponse
    -- ** Response constructor
    , listGrantsResponse
    -- ** Response lenses
    , lgrGrants
    , lgrNextMarker
    , lgrTruncated
    ) where

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

data ListGrants = ListGrants
    { _lgKeyId  :: Text
    , _lgLimit  :: Maybe Nat
    , _lgMarker :: Maybe Text
    } deriving (Eq, Ord, Read, Show)

-- | 'ListGrants' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'lgKeyId' @::@ 'Text'
--
-- * 'lgLimit' @::@ 'Maybe' 'Natural'
--
-- * 'lgMarker' @::@ 'Maybe' 'Text'
--
listGrants :: Text -- ^ 'lgKeyId'
           -> ListGrants
listGrants p1 = ListGrants
    { _lgKeyId  = p1
    , _lgLimit  = Nothing
    , _lgMarker = Nothing
    }

-- | A unique identifier for the customer master key. This value can be a globally
-- unique identifier or the fully specified ARN to a key.  Key ARN Example -
-- arn:aws:kms:us-east-1:123456789012:key/12345678-1234-1234-1234-123456789012 Globally Unique Key ID Example - 12345678-1234-1234-1234-123456789012
--
lgKeyId :: Lens' ListGrants Text
lgKeyId = lens _lgKeyId (\s a -> s { _lgKeyId = a })

-- | Specify this parameter only when paginating results to indicate the maximum
-- number of grants you want listed in the response. If there are additional
-- grants beyond the maximum you specify, the 'Truncated' response element will be
-- set to 'true.'
lgLimit :: Lens' ListGrants (Maybe Natural)
lgLimit = lens _lgLimit (\s a -> s { _lgLimit = a }) . mapping _Nat

-- | Use this parameter only when paginating results, and only in a subsequent
-- request after you've received a response where the results are truncated. Set
-- it to the value of the 'NextMarker' in the response you just received.
lgMarker :: Lens' ListGrants (Maybe Text)
lgMarker = lens _lgMarker (\s a -> s { _lgMarker = a })

data ListGrantsResponse = ListGrantsResponse
    { _lgrGrants     :: List "Grants" GrantListEntry
    , _lgrNextMarker :: Maybe Text
    , _lgrTruncated  :: Maybe Bool
    } deriving (Eq, Read, Show)

-- | 'ListGrantsResponse' constructor.
--
-- The fields accessible through corresponding lenses are:
--
-- * 'lgrGrants' @::@ ['GrantListEntry']
--
-- * 'lgrNextMarker' @::@ 'Maybe' 'Text'
--
-- * 'lgrTruncated' @::@ 'Maybe' 'Bool'
--
listGrantsResponse :: ListGrantsResponse
listGrantsResponse = ListGrantsResponse
    { _lgrGrants     = mempty
    , _lgrNextMarker = Nothing
    , _lgrTruncated  = Nothing
    }

-- | A list of grants.
lgrGrants :: Lens' ListGrantsResponse [GrantListEntry]
lgrGrants = lens _lgrGrants (\s a -> s { _lgrGrants = a }) . _List

-- | If 'Truncated' is true, this value is present and contains the value to use for
-- the 'Marker' request parameter in a subsequent pagination request.
lgrNextMarker :: Lens' ListGrantsResponse (Maybe Text)
lgrNextMarker = lens _lgrNextMarker (\s a -> s { _lgrNextMarker = a })

-- | A flag that indicates whether there are more items in the list. If your
-- results were truncated, you can make a subsequent pagination request using
-- the 'Marker' request parameter to retrieve more grants in the list.
lgrTruncated :: Lens' ListGrantsResponse (Maybe Bool)
lgrTruncated = lens _lgrTruncated (\s a -> s { _lgrTruncated = a })

instance ToPath ListGrants where
    toPath = const "/"

instance ToQuery ListGrants where
    toQuery = const mempty

instance ToHeaders ListGrants

instance ToJSON ListGrants where
    toJSON ListGrants{..} = object
        [ "KeyId"  .= _lgKeyId
        , "Limit"  .= _lgLimit
        , "Marker" .= _lgMarker
        ]

instance AWSRequest ListGrants where
    type Sv ListGrants = KMS
    type Rs ListGrants = ListGrantsResponse

    request  = post "ListGrants"
    response = jsonResponse

instance FromJSON ListGrantsResponse where
    parseJSON = withObject "ListGrantsResponse" $ \o -> ListGrantsResponse
        <$> o .:? "Grants" .!= mempty
        <*> o .:? "NextMarker"
        <*> o .:? "Truncated"