{-# 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.Lambda.GetPolicy
-- Copyright   : (c) 2013-2016 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Returns the resource policy associated with the specified Lambda
-- function.
--
-- If you are using the versioning feature, you can get the resource policy
-- associated with the specific Lambda function version or alias by
-- specifying the version or alias name using the 'Qualifier' parameter.
-- For more information about versioning, see
-- <http://docs.aws.amazon.com/lambda/latest/dg/versioning-aliases.html AWS Lambda Function Versioning and Aliases>.
--
-- For information about adding permissions, see < AddPermission>.
--
-- You need permission for the 'lambda:GetPolicy action.'
module Network.AWS.Lambda.GetPolicy
    (
    -- * Creating a Request
      getPolicy
    , GetPolicy
    -- * Request Lenses
    , gpQualifier
    , gpFunctionName

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

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

-- | /See:/ 'getPolicy' smart constructor.
data GetPolicy = GetPolicy'
    { _gpQualifier    :: !(Maybe Text)
    , _gpFunctionName :: !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:
--
-- * 'gpQualifier'
--
-- * 'gpFunctionName'
getPolicy
    :: Text -- ^ 'gpFunctionName'
    -> GetPolicy
getPolicy pFunctionName_ =
    GetPolicy'
    { _gpQualifier = Nothing
    , _gpFunctionName = pFunctionName_
    }

-- | You can specify this optional query parameter to specify a function
-- version or an alias name in which case this API will return all
-- permissions associated with the specific qualified ARN. If you don\'t
-- provide this parameter, the API will return permissions that apply to
-- the unqualified function ARN.
gpQualifier :: Lens' GetPolicy (Maybe Text)
gpQualifier = lens _gpQualifier (\ s a -> s{_gpQualifier = a});

-- | Function name whose resource policy you want to retrieve.
--
-- You can specify the function name (for example, 'Thumbnail') or you can
-- specify Amazon Resource Name (ARN) of the function (for example,
-- 'arn:aws:lambda:us-west-2:account-id:function:ThumbNail'). If you are
-- using versioning, you can also provide a qualified function ARN (ARN
-- that is qualified with function version or alias name as suffix). AWS
-- Lambda also allows you to specify only the function name with the
-- account ID qualifier (for example, 'account-id:Thumbnail'). Note that
-- the length constraint applies only to the ARN. If you specify only the
-- function name, it is limited to 64 character in length.
gpFunctionName :: Lens' GetPolicy Text
gpFunctionName = lens _gpFunctionName (\ s a -> s{_gpFunctionName = a});

instance AWSRequest GetPolicy where
        type Rs GetPolicy = GetPolicyResponse
        request = get lambda
        response
          = receiveJSON
              (\ s h x ->
                 GetPolicyResponse' <$>
                   (x .?> "Policy") <*> (pure (fromEnum s)))

instance Hashable GetPolicy

instance NFData GetPolicy

instance ToHeaders GetPolicy where
        toHeaders = const mempty

instance ToPath GetPolicy where
        toPath GetPolicy'{..}
          = mconcat
              ["/2015-03-31/functions/", toBS _gpFunctionName,
               "/policy"]

instance ToQuery GetPolicy where
        toQuery GetPolicy'{..}
          = mconcat ["Qualifier" =: _gpQualifier]

-- | /See:/ 'getPolicyResponse' smart constructor.
data GetPolicyResponse = GetPolicyResponse'
    { _gprsPolicy         :: !(Maybe Text)
    , _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'
--
-- * 'gprsResponseStatus'
getPolicyResponse
    :: Int -- ^ 'gprsResponseStatus'
    -> GetPolicyResponse
getPolicyResponse pResponseStatus_ =
    GetPolicyResponse'
    { _gprsPolicy = Nothing
    , _gprsResponseStatus = pResponseStatus_
    }

-- | The resource policy associated with the specified function. The response
-- returns the same as a string using a backslash (\"\\\") as an escape
-- character in the JSON.
gprsPolicy :: Lens' GetPolicyResponse (Maybe Text)
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