{-# 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.WAF.UpdateRule
-- Copyright   : (c) 2013-2015 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)
--
-- Inserts or deletes Predicate objects in a 'Rule'. Each 'Predicate'
-- object identifies a predicate, such as a ByteMatchSet or an IPSet, that
-- specifies the web requests that you want to allow, block, or count. If
-- you add more than one predicate to a 'Rule', a request must match all of
-- the specifications to be allowed, blocked, or counted. For example,
-- suppose you add the following to a 'Rule':
--
-- -   A 'ByteMatchSet' that matches the value 'BadBot' in the 'User-Agent'
--     header
-- -   An 'IPSet' that matches the IP address '192.0.2.44'
--
-- You then add the 'Rule' to a 'WebACL' and specify that you want to block
-- requests that satisfy the 'Rule'. For a request to be blocked, the
-- 'User-Agent' header in the request must contain the value 'BadBot' /and/
-- the request must originate from the IP address 192.0.2.44.
--
-- To create and configure a 'Rule', perform the following steps:
--
-- 1.  Create and update the predicates that you want to include in the
--     'Rule'.
-- 2.  Create the 'Rule'. See CreateRule.
-- 3.  Use 'GetChangeToken' to get the change token that you provide in the
--     'ChangeToken' parameter of an UpdateRule request.
-- 4.  Submit an 'UpdateRule' request to add predicates to the 'Rule'.
-- 5.  Create and update a 'WebACL' that contains the 'Rule'. See
--     CreateWebACL.
--
-- If you want to replace one 'ByteMatchSet' or 'IPSet' with another, you
-- delete the existing one and add the new one.
--
-- For more information about how to use the AWS WAF API to allow or block
-- HTTP requests, see the
-- <http://docs.aws.amazon.com/waf/latest/developerguide/ AWS WAF Developer Guide>.
--
-- /See:/ <http://docs.aws.amazon.com/waf/latest/APIReference/API_UpdateRule.html AWS API Reference> for UpdateRule.
module Network.AWS.WAF.UpdateRule
    (
    -- * Creating a Request
      updateRule
    , UpdateRule
    -- * Request Lenses
    , urRuleId
    , urChangeToken
    , urUpdates

    -- * Destructuring the Response
    , updateRuleResponse
    , UpdateRuleResponse
    -- * Response Lenses
    , urrsChangeToken
    , urrsResponseStatus
    ) where

import           Network.AWS.Prelude
import           Network.AWS.Request
import           Network.AWS.Response
import           Network.AWS.WAF.Types
import           Network.AWS.WAF.Types.Product

-- | /See:/ 'updateRule' smart constructor.
data UpdateRule = UpdateRule'
    { _urRuleId      :: !Text
    , _urChangeToken :: !Text
    , _urUpdates     :: ![RuleUpdate]
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'UpdateRule' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'urRuleId'
--
-- * 'urChangeToken'
--
-- * 'urUpdates'
updateRule
    :: Text -- ^ 'urRuleId'
    -> Text -- ^ 'urChangeToken'
    -> UpdateRule
updateRule pRuleId_ pChangeToken_ =
    UpdateRule'
    { _urRuleId = pRuleId_
    , _urChangeToken = pChangeToken_
    , _urUpdates = mempty
    }

-- | The 'RuleId' of the 'Rule' that you want to update. 'RuleId' is returned
-- by 'CreateRule' and by ListRules.
urRuleId :: Lens' UpdateRule Text
urRuleId = lens _urRuleId (\ s a -> s{_urRuleId = a});

-- | The value returned by the most recent call to GetChangeToken.
urChangeToken :: Lens' UpdateRule Text
urChangeToken = lens _urChangeToken (\ s a -> s{_urChangeToken = a});

-- | An array of 'RuleUpdate' objects that you want to insert into or delete
-- from a Rule. For more information, see the applicable data types:
--
-- -   RuleUpdate: Contains 'Action' and 'Predicate'
-- -   Predicate: Contains 'DataId', 'Negated', and 'Type'
-- -   FieldToMatch: Contains 'Data' and 'Type'
urUpdates :: Lens' UpdateRule [RuleUpdate]
urUpdates = lens _urUpdates (\ s a -> s{_urUpdates = a}) . _Coerce;

instance AWSRequest UpdateRule where
        type Rs UpdateRule = UpdateRuleResponse
        request = postJSON wAF
        response
          = receiveJSON
              (\ s h x ->
                 UpdateRuleResponse' <$>
                   (x .?> "ChangeToken") <*> (pure (fromEnum s)))

instance ToHeaders UpdateRule where
        toHeaders
          = const
              (mconcat
                 ["X-Amz-Target" =#
                    ("AWSWAF_20150824.UpdateRule" :: ByteString),
                  "Content-Type" =#
                    ("application/x-amz-json-1.1" :: ByteString)])

instance ToJSON UpdateRule where
        toJSON UpdateRule'{..}
          = object
              (catMaybes
                 [Just ("RuleId" .= _urRuleId),
                  Just ("ChangeToken" .= _urChangeToken),
                  Just ("Updates" .= _urUpdates)])

instance ToPath UpdateRule where
        toPath = const "/"

instance ToQuery UpdateRule where
        toQuery = const mempty

-- | /See:/ 'updateRuleResponse' smart constructor.
data UpdateRuleResponse = UpdateRuleResponse'
    { _urrsChangeToken    :: !(Maybe Text)
    , _urrsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'UpdateRuleResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'urrsChangeToken'
--
-- * 'urrsResponseStatus'
updateRuleResponse
    :: Int -- ^ 'urrsResponseStatus'
    -> UpdateRuleResponse
updateRuleResponse pResponseStatus_ =
    UpdateRuleResponse'
    { _urrsChangeToken = Nothing
    , _urrsResponseStatus = pResponseStatus_
    }

-- | The 'ChangeToken' that you used to submit the 'UpdateRule' request. You
-- can also use this value to query the status of the request. For more
-- information, see GetChangeTokenStatus.
urrsChangeToken :: Lens' UpdateRuleResponse (Maybe Text)
urrsChangeToken = lens _urrsChangeToken (\ s a -> s{_urrsChangeToken = a});

-- | The response status code.
urrsResponseStatus :: Lens' UpdateRuleResponse Int
urrsResponseStatus = lens _urrsResponseStatus (\ s a -> s{_urrsResponseStatus = a});