{-# 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.IAM.ListPolicies
-- 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)
--
-- Lists all the managed policies that are available in your AWS account, including your own customer-defined managed policies and all AWS managed policies.
--
-- You can filter the list of policies that is returned using the optional 'OnlyAttached', 'Scope', and 'PathPrefix' parameters. For example, to list only the customer managed policies in your AWS account, set 'Scope' to 'Local'. To list only AWS managed policies, set 'Scope' to 'AWS'.
--
-- You can paginate the results using the 'MaxItems' and 'Marker' parameters.
--
-- For more information about managed policies, see <http://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-vs-inline.html Managed Policies and Inline Policies> in the /IAM User Guide/.
--
-- This operation returns paginated results.
module Network.AWS.IAM.ListPolicies
    (
    -- * Creating a Request
      listPolicies
    , ListPolicies
    -- * Request Lenses
    , lpPathPrefix
    , lpOnlyAttached
    , lpMarker
    , lpScope
    , lpMaxItems

    -- * Destructuring the Response
    , listPoliciesResponse
    , ListPoliciesResponse
    -- * Response Lenses
    , lprsMarker
    , lprsIsTruncated
    , lprsPolicies
    , lprsResponseStatus
    ) where

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

-- | /See:/ 'listPolicies' smart constructor.
data ListPolicies = ListPolicies'
    { _lpPathPrefix   :: !(Maybe Text)
    , _lpOnlyAttached :: !(Maybe Bool)
    , _lpMarker       :: !(Maybe Text)
    , _lpScope        :: !(Maybe PolicyScopeType)
    , _lpMaxItems     :: !(Maybe Nat)
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'ListPolicies' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'lpPathPrefix'
--
-- * 'lpOnlyAttached'
--
-- * 'lpMarker'
--
-- * 'lpScope'
--
-- * 'lpMaxItems'
listPolicies
    :: ListPolicies
listPolicies =
    ListPolicies'
    { _lpPathPrefix = Nothing
    , _lpOnlyAttached = Nothing
    , _lpMarker = Nothing
    , _lpScope = Nothing
    , _lpMaxItems = Nothing
    }

-- | The path prefix for filtering the results. This parameter is optional. If it is not included, it defaults to a slash (\/), listing all policies. The <http://wikipedia.org/wiki/regex regex pattern> for this parameter is a string of characters consisting of either a forward slash (\/) by itself or a string that must begin and end with forward slashes, containing any ASCII character from the ! (\\u0021) thru the DEL character (\\u007F), including most punctuation characters, digits, and upper and lowercased letters.
lpPathPrefix :: Lens' ListPolicies (Maybe Text)
lpPathPrefix = lens _lpPathPrefix (\ s a -> s{_lpPathPrefix = a});

-- | A flag to filter the results to only the attached policies.
--
-- When 'OnlyAttached' is 'true', the returned list contains only the policies that are attached to an IAM user, group, or role. When 'OnlyAttached' is 'false', or when the parameter is not included, all policies are returned.
lpOnlyAttached :: Lens' ListPolicies (Maybe Bool)
lpOnlyAttached = lens _lpOnlyAttached (\ s a -> s{_lpOnlyAttached = a});

-- | Use this parameter only when paginating results and only after you receive a response indicating that the results are truncated. Set it to the value of the 'Marker' element in the response that you received to indicate where the next call should start.
lpMarker :: Lens' ListPolicies (Maybe Text)
lpMarker = lens _lpMarker (\ s a -> s{_lpMarker = a});

-- | The scope to use for filtering the results.
--
-- To list only AWS managed policies, set 'Scope' to 'AWS'. To list only the customer managed policies in your AWS account, set 'Scope' to 'Local'.
--
-- This parameter is optional. If it is not included, or if it is set to 'All', all policies are returned.
lpScope :: Lens' ListPolicies (Maybe PolicyScopeType)
lpScope = lens _lpScope (\ s a -> s{_lpScope = a});

-- | Use this only when paginating results to indicate the maximum number of items you want in the response. If additional items exist beyond the maximum you specify, the 'IsTruncated' response element is 'true'.
--
-- This parameter is optional. If you do not include it, it defaults to 100. Note that IAM might return fewer results, even when there are more results available. In that case, the 'IsTruncated' response element returns 'true' and 'Marker' contains a value to include in the subsequent call that tells the service where to continue from.
lpMaxItems :: Lens' ListPolicies (Maybe Natural)
lpMaxItems = lens _lpMaxItems (\ s a -> s{_lpMaxItems = a}) . mapping _Nat;

instance AWSPager ListPolicies where
        page rq rs
          | stop (rs ^. lprsIsTruncated) = Nothing
          | isNothing (rs ^. lprsMarker) = Nothing
          | otherwise =
            Just $ rq & lpMarker .~ rs ^. lprsMarker

instance AWSRequest ListPolicies where
        type Rs ListPolicies = ListPoliciesResponse
        request = postQuery iam
        response
          = receiveXMLWrapper "ListPoliciesResult"
              (\ s h x ->
                 ListPoliciesResponse' <$>
                   (x .@? "Marker") <*> (x .@? "IsTruncated") <*>
                     (x .@? "Policies" .!@ mempty >>=
                        may (parseXMLList "member"))
                     <*> (pure (fromEnum s)))

instance Hashable ListPolicies

instance NFData ListPolicies

instance ToHeaders ListPolicies where
        toHeaders = const mempty

instance ToPath ListPolicies where
        toPath = const "/"

instance ToQuery ListPolicies where
        toQuery ListPolicies'{..}
          = mconcat
              ["Action" =: ("ListPolicies" :: ByteString),
               "Version" =: ("2010-05-08" :: ByteString),
               "PathPrefix" =: _lpPathPrefix,
               "OnlyAttached" =: _lpOnlyAttached,
               "Marker" =: _lpMarker, "Scope" =: _lpScope,
               "MaxItems" =: _lpMaxItems]

-- | Contains the response to a successful < ListPolicies> request.
--
-- /See:/ 'listPoliciesResponse' smart constructor.
data ListPoliciesResponse = ListPoliciesResponse'
    { _lprsMarker         :: !(Maybe Text)
    , _lprsIsTruncated    :: !(Maybe Bool)
    , _lprsPolicies       :: !(Maybe [Policy])
    , _lprsResponseStatus :: !Int
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'ListPoliciesResponse' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'lprsMarker'
--
-- * 'lprsIsTruncated'
--
-- * 'lprsPolicies'
--
-- * 'lprsResponseStatus'
listPoliciesResponse
    :: Int -- ^ 'lprsResponseStatus'
    -> ListPoliciesResponse
listPoliciesResponse pResponseStatus_ =
    ListPoliciesResponse'
    { _lprsMarker = Nothing
    , _lprsIsTruncated = Nothing
    , _lprsPolicies = Nothing
    , _lprsResponseStatus = pResponseStatus_
    }

-- | When 'IsTruncated' is 'true', this element is present and contains the value to use for the 'Marker' parameter in a subsequent pagination request.
lprsMarker :: Lens' ListPoliciesResponse (Maybe Text)
lprsMarker = lens _lprsMarker (\ s a -> s{_lprsMarker = a});

-- | A flag that indicates whether there are more items to return. If your results were truncated, you can make a subsequent pagination request using the 'Marker' request parameter to retrieve more items. Note that IAM might return fewer than the 'MaxItems' number of results even when there are more results available. We recommend that you check 'IsTruncated' after every call to ensure that you receive all of your results.
lprsIsTruncated :: Lens' ListPoliciesResponse (Maybe Bool)
lprsIsTruncated = lens _lprsIsTruncated (\ s a -> s{_lprsIsTruncated = a});

-- | A list of policies.
lprsPolicies :: Lens' ListPoliciesResponse [Policy]
lprsPolicies = lens _lprsPolicies (\ s a -> s{_lprsPolicies = a}) . _Default . _Coerce;

-- | The response status code.
lprsResponseStatus :: Lens' ListPoliciesResponse Int
lprsResponseStatus = lens _lprsResponseStatus (\ s a -> s{_lprsResponseStatus = a});

instance NFData ListPoliciesResponse