Armor.hs

{-# LANGUAGE RecordWildCards #-}

-- Armor.hs: hOpenPGP-tools common ASCII de-Armor function
-- Copyright © 2012-2020  Clint Adams
--
-- vim: softtabstop=4:shiftwidth=4:expandtab
--
-- 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 <http://www.gnu.org/licenses/>.
module HOpenPGP.Tools.Armor
  ( doDeArmor
  ) where

import qualified Codec.Encryption.OpenPGP.ASCIIArmor as AA
import Codec.Encryption.OpenPGP.ASCIIArmor.Types (Armor(..))
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as BL
import Data.Conduit ((.|), runConduitRes)
import qualified Data.Conduit.Binary as CB
import qualified Data.Conduit.List as CL
import System.IO (hPutStrLn, stderr, stdin)

doDeArmor :: IO ()
doDeArmor = do
  a <- runConduitRes $ CB.sourceHandle stdin .| CL.consume
  case AA.decode (B.concat a) of
    Left e -> hPutStrLn stderr $ "Failure to decode ASCII Armor:" ++ e
    Right msgs -> BL.putStr $ BL.concat (map (\(Armor _ _ bs) -> bs) msgs)