{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE StrictData #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# OPTIONS_GHC -fno-warn-unused-binds #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}
{-# OPTIONS_GHC -fno-warn-unused-matches #-}

-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- |
-- Module      : Amazonka.IAM.GetPolicy
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Retrieves information about the specified managed policy, including the
-- policy\'s default version and the total number of IAM users, groups, and
-- roles to which the policy is attached. To retrieve the list of the
-- specific users, groups, and roles that the policy is attached to, use
-- ListEntitiesForPolicy. This operation returns metadata about the policy.
-- To retrieve the actual policy document for a specific version of the
-- policy, use GetPolicyVersion.
--
-- This operation retrieves information about managed policies. To retrieve
-- information about an inline policy that is embedded with an IAM user,
-- group, or role, use GetUserPolicy, GetGroupPolicy, or GetRolePolicy.
--
-- For more information about policies, see
-- <https://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-vs-inline.html Managed policies and inline policies>
-- in the /IAM User Guide/.
module Amazonka.IAM.GetPolicy
  ( -- * Creating a Request
    GetPolicy (..),
    newGetPolicy,

    -- * Request Lenses
    getPolicy_policyArn,

    -- * Destructuring the Response
    GetPolicyResponse (..),
    newGetPolicyResponse,

    -- * Response Lenses
    getPolicyResponse_policy,
    getPolicyResponse_httpStatus,
  )
where

import qualified Amazonka.Core as Core
import qualified Amazonka.Core.Lens.Internal as Lens
import qualified Amazonka.Data as Data
import Amazonka.IAM.Types
import qualified Amazonka.Prelude as Prelude
import qualified Amazonka.Request as Request
import qualified Amazonka.Response as Response

-- | /See:/ 'newGetPolicy' smart constructor.
data GetPolicy = GetPolicy'
  { -- | The Amazon Resource Name (ARN) of the managed policy that you want
    -- information about.
    --
    -- For more information about ARNs, see
    -- <https://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html Amazon Resource Names (ARNs)>
    -- in the /Amazon Web Services General Reference/.
    policyArn :: Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'GetPolicy' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'policyArn', 'getPolicy_policyArn' - The Amazon Resource Name (ARN) of the managed policy that you want
-- information about.
--
-- For more information about ARNs, see
-- <https://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html Amazon Resource Names (ARNs)>
-- in the /Amazon Web Services General Reference/.
newGetPolicy ::
  -- | 'policyArn'
  Prelude.Text ->
  GetPolicy
newGetPolicy pPolicyArn_ =
  GetPolicy' {policyArn = pPolicyArn_}

-- | The Amazon Resource Name (ARN) of the managed policy that you want
-- information about.
--
-- For more information about ARNs, see
-- <https://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html Amazon Resource Names (ARNs)>
-- in the /Amazon Web Services General Reference/.
getPolicy_policyArn :: Lens.Lens' GetPolicy Prelude.Text
getPolicy_policyArn = Lens.lens (\GetPolicy' {policyArn} -> policyArn) (\s@GetPolicy' {} a -> s {policyArn = a} :: GetPolicy)

instance Core.AWSRequest GetPolicy where
  type AWSResponse GetPolicy = GetPolicyResponse
  request overrides =
    Request.postQuery (overrides defaultService)
  response =
    Response.receiveXMLWrapper
      "GetPolicyResult"
      ( \s h x ->
          GetPolicyResponse'
            Prelude.<$> (x Data..@? "Policy")
            Prelude.<*> (Prelude.pure (Prelude.fromEnum s))
      )

instance Prelude.Hashable GetPolicy where
  hashWithSalt _salt GetPolicy' {..} =
    _salt `Prelude.hashWithSalt` policyArn

instance Prelude.NFData GetPolicy where
  rnf GetPolicy' {..} = Prelude.rnf policyArn

instance Data.ToHeaders GetPolicy where
  toHeaders = Prelude.const Prelude.mempty

instance Data.ToPath GetPolicy where
  toPath = Prelude.const "/"

instance Data.ToQuery GetPolicy where
  toQuery GetPolicy' {..} =
    Prelude.mconcat
      [ "Action"
          Data.=: ("GetPolicy" :: Prelude.ByteString),
        "Version"
          Data.=: ("2010-05-08" :: Prelude.ByteString),
        "PolicyArn" Data.=: policyArn
      ]

-- | Contains the response to a successful GetPolicy request.
--
-- /See:/ 'newGetPolicyResponse' smart constructor.
data GetPolicyResponse = GetPolicyResponse'
  { -- | A structure containing details about the policy.
    policy :: Prelude.Maybe Policy,
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'GetPolicyResponse' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'policy', 'getPolicyResponse_policy' - A structure containing details about the policy.
--
-- 'httpStatus', 'getPolicyResponse_httpStatus' - The response's http status code.
newGetPolicyResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  GetPolicyResponse
newGetPolicyResponse pHttpStatus_ =
  GetPolicyResponse'
    { policy = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | A structure containing details about the policy.
getPolicyResponse_policy :: Lens.Lens' GetPolicyResponse (Prelude.Maybe Policy)
getPolicyResponse_policy = Lens.lens (\GetPolicyResponse' {policy} -> policy) (\s@GetPolicyResponse' {} a -> s {policy = a} :: GetPolicyResponse)

-- | The response's http status code.
getPolicyResponse_httpStatus :: Lens.Lens' GetPolicyResponse Prelude.Int
getPolicyResponse_httpStatus = Lens.lens (\GetPolicyResponse' {httpStatus} -> httpStatus) (\s@GetPolicyResponse' {} a -> s {httpStatus = a} :: GetPolicyResponse)

instance Prelude.NFData GetPolicyResponse where
  rnf GetPolicyResponse' {..} =
    Prelude.rnf policy
      `Prelude.seq` Prelude.rnf httpStatus