{-# 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.SSM.GetParametersByPath
-- 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)
--
-- Retrieve parameters in a specific hierarchy. For more information, see <http://docs.aws.amazon.com/systems-manager/latest/userguide/sysman-paramstore-working.html Working with Systems Manager Parameters> .
--
--
-- Request results are returned on a best-effort basis. If you specify @MaxResults@ in the request, the response includes information up to the limit specified. The number of items returned, however, can be between zero and the value of @MaxResults@ . If the service reaches an internal limit while processing the results, it stops the operation and returns the matching values up to that point and a @NextToken@ . You can specify the @NextToken@ in a subsequent call to get the next set of results.
--
--
-- This operation returns paginated results.
module Network.AWS.SSM.GetParametersByPath
    (
    -- * Creating a Request
      getParametersByPath
    , GetParametersByPath
    -- * Request Lenses
    , gpbpWithDecryption
    , gpbpParameterFilters
    , gpbpNextToken
    , gpbpRecursive
    , gpbpMaxResults
    , gpbpPath

    -- * Destructuring the Response
    , getParametersByPathResponse
    , GetParametersByPathResponse
    -- * Response Lenses
    , gpbprsNextToken
    , gpbprsParameters
    , gpbprsResponseStatus
    ) where

import Network.AWS.Lens
import Network.AWS.Pager
import Network.AWS.Prelude
import Network.AWS.Request
import Network.AWS.Response
import Network.AWS.SSM.Types
import Network.AWS.SSM.Types.Product

-- | /See:/ 'getParametersByPath' smart constructor.
data GetParametersByPath = GetParametersByPath'
  { _gpbpWithDecryption   :: !(Maybe Bool)
  , _gpbpParameterFilters :: !(Maybe [ParameterStringFilter])
  , _gpbpNextToken        :: !(Maybe Text)
  , _gpbpRecursive        :: !(Maybe Bool)
  , _gpbpMaxResults       :: !(Maybe Nat)
  , _gpbpPath             :: !Text
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'GetParametersByPath' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'gpbpWithDecryption' - Retrieve all parameters in a hierarchy with their value decrypted.
--
-- * 'gpbpParameterFilters' - Filters to limit the request results.
--
-- * 'gpbpNextToken' - A token to start the list. Use this token to get the next set of results.
--
-- * 'gpbpRecursive' - Retrieve all parameters within a hierarchy. /Important:/ If a user has access to a path, then the user can access all levels of that path. For example, if a user has permission to access path /a, then the user can also access /a/b. Even if a user has explicitly been denied access in IAM for parameter /a, they can still call the GetParametersByPath API action recursively and view /a/b.
--
-- * 'gpbpMaxResults' - The maximum number of items to return for this call. The call also returns a token that you can specify in a subsequent call to get the next set of results.
--
-- * 'gpbpPath' - The hierarchy for the parameter. Hierarchies start with a forward slash (/) and end with the parameter name. A hierarchy can have a maximum of 15 levels. Here is an example of a hierarchy: @/Finance/Prod/IAD/WinServ2016/license33@
getParametersByPath
    :: Text -- ^ 'gpbpPath'
    -> GetParametersByPath
getParametersByPath pPath_ =
  GetParametersByPath'
    { _gpbpWithDecryption = Nothing
    , _gpbpParameterFilters = Nothing
    , _gpbpNextToken = Nothing
    , _gpbpRecursive = Nothing
    , _gpbpMaxResults = Nothing
    , _gpbpPath = pPath_
    }


-- | Retrieve all parameters in a hierarchy with their value decrypted.
gpbpWithDecryption :: Lens' GetParametersByPath (Maybe Bool)
gpbpWithDecryption = lens _gpbpWithDecryption (\ s a -> s{_gpbpWithDecryption = a})

-- | Filters to limit the request results.
gpbpParameterFilters :: Lens' GetParametersByPath [ParameterStringFilter]
gpbpParameterFilters = lens _gpbpParameterFilters (\ s a -> s{_gpbpParameterFilters = a}) . _Default . _Coerce

-- | A token to start the list. Use this token to get the next set of results.
gpbpNextToken :: Lens' GetParametersByPath (Maybe Text)
gpbpNextToken = lens _gpbpNextToken (\ s a -> s{_gpbpNextToken = a})

-- | Retrieve all parameters within a hierarchy. /Important:/ If a user has access to a path, then the user can access all levels of that path. For example, if a user has permission to access path /a, then the user can also access /a/b. Even if a user has explicitly been denied access in IAM for parameter /a, they can still call the GetParametersByPath API action recursively and view /a/b.
gpbpRecursive :: Lens' GetParametersByPath (Maybe Bool)
gpbpRecursive = lens _gpbpRecursive (\ s a -> s{_gpbpRecursive = a})

-- | The maximum number of items to return for this call. The call also returns a token that you can specify in a subsequent call to get the next set of results.
gpbpMaxResults :: Lens' GetParametersByPath (Maybe Natural)
gpbpMaxResults = lens _gpbpMaxResults (\ s a -> s{_gpbpMaxResults = a}) . mapping _Nat

-- | The hierarchy for the parameter. Hierarchies start with a forward slash (/) and end with the parameter name. A hierarchy can have a maximum of 15 levels. Here is an example of a hierarchy: @/Finance/Prod/IAD/WinServ2016/license33@
gpbpPath :: Lens' GetParametersByPath Text
gpbpPath = lens _gpbpPath (\ s a -> s{_gpbpPath = a})

instance AWSPager GetParametersByPath where
        page rq rs
          | stop (rs ^. gpbprsNextToken) = Nothing
          | stop (rs ^. gpbprsParameters) = Nothing
          | otherwise =
            Just $ rq & gpbpNextToken .~ rs ^. gpbprsNextToken

instance AWSRequest GetParametersByPath where
        type Rs GetParametersByPath =
             GetParametersByPathResponse
        request = postJSON ssm
        response
          = receiveJSON
              (\ s h x ->
                 GetParametersByPathResponse' <$>
                   (x .?> "NextToken") <*>
                     (x .?> "Parameters" .!@ mempty)
                     <*> (pure (fromEnum s)))

instance Hashable GetParametersByPath where

instance NFData GetParametersByPath where

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

instance ToJSON GetParametersByPath where
        toJSON GetParametersByPath'{..}
          = object
              (catMaybes
                 [("WithDecryption" .=) <$> _gpbpWithDecryption,
                  ("ParameterFilters" .=) <$> _gpbpParameterFilters,
                  ("NextToken" .=) <$> _gpbpNextToken,
                  ("Recursive" .=) <$> _gpbpRecursive,
                  ("MaxResults" .=) <$> _gpbpMaxResults,
                  Just ("Path" .= _gpbpPath)])

instance ToPath GetParametersByPath where
        toPath = const "/"

instance ToQuery GetParametersByPath where
        toQuery = const mempty

-- | /See:/ 'getParametersByPathResponse' smart constructor.
data GetParametersByPathResponse = GetParametersByPathResponse'
  { _gpbprsNextToken      :: !(Maybe Text)
  , _gpbprsParameters     :: !(Maybe [Parameter])
  , _gpbprsResponseStatus :: !Int
  } deriving (Eq, Read, Show, Data, Typeable, Generic)


-- | Creates a value of 'GetParametersByPathResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'gpbprsNextToken' - The token for the next set of items to return. Use this token to get the next set of results.
--
-- * 'gpbprsParameters' - A list of parameters found in the specified hierarchy.
--
-- * 'gpbprsResponseStatus' - -- | The response status code.
getParametersByPathResponse
    :: Int -- ^ 'gpbprsResponseStatus'
    -> GetParametersByPathResponse
getParametersByPathResponse pResponseStatus_ =
  GetParametersByPathResponse'
    { _gpbprsNextToken = Nothing
    , _gpbprsParameters = Nothing
    , _gpbprsResponseStatus = pResponseStatus_
    }


-- | The token for the next set of items to return. Use this token to get the next set of results.
gpbprsNextToken :: Lens' GetParametersByPathResponse (Maybe Text)
gpbprsNextToken = lens _gpbprsNextToken (\ s a -> s{_gpbprsNextToken = a})

-- | A list of parameters found in the specified hierarchy.
gpbprsParameters :: Lens' GetParametersByPathResponse [Parameter]
gpbprsParameters = lens _gpbprsParameters (\ s a -> s{_gpbprsParameters = a}) . _Default . _Coerce

-- | -- | The response status code.
gpbprsResponseStatus :: Lens' GetParametersByPathResponse Int
gpbprsResponseStatus = lens _gpbprsResponseStatus (\ s a -> s{_gpbprsResponseStatus = a})

instance NFData GetParametersByPathResponse where