content: -- This file is part of the Wire Server implementation.
  --
  -- Copyright (C) 2022 Wire Swiss GmbH <opensource@wire.com>
  --
  -- This program is free software: you can redistribute it and/or modify it under
  -- the terms of the GNU Affero General Public License as published by the Free
  -- Software Foundation, either version 3 of the License, or (at your option) any
  -- later version.
  --
  -- This program is distributed in the hope that it will be useful, but WITHOUT
  -- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  -- FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
  -- details.
  --
  -- You should have received a copy of the GNU Affero General Public License along
  -- with this program. If not, see <https://www.gnu.org/licenses/>.
  
  module Galley.API.MLS.Enabled where
  
  import Control.Lens (view)
  import Galley.Env
  import Imports hiding (getFirst)
  import Polysemy
  import Polysemy.Input
  import Wire.API.Error
  import Wire.API.Error.Galley
  import Wire.API.MLS.Keys
  
  isMLSEnabled :: (Member (Input Env) r) => Sem r Bool
  isMLSEnabled = inputs (isJust . view mlsKeys)
  
  -- | Fail if MLS is not enabled. Only use this function at the beginning of an
  -- MLS endpoint, NOT in utility functions.
  assertMLSEnabled ::
    ( Member (Input Env) r,
      Member (ErrorS 'MLSNotEnabled) r
    ) =>
    Sem r ()
  assertMLSEnabled = void getMLSPrivateKeys
  
  getMLSPrivateKeys ::
    ( Member (Input Env) r,
      Member (ErrorS 'MLSNotEnabled) r
    ) =>
    Sem r (MLSKeysByPurpose MLSPrivateKeys)
  getMLSPrivateKeys = noteS @'MLSNotEnabled =<< inputs (view mlsKeys)
  