From f609499402160aa908e6435b8a61f7cb1f258cfe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Thu, 16 May 2019 20:31:51 +0200
Subject: Key storage interface

---
 src/Storage/Key.hs | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 src/Storage/Key.hs

(limited to 'src/Storage/Key.hs')

diff --git a/src/Storage/Key.hs b/src/Storage/Key.hs
new file mode 100644
index 0000000..3ed4a66
--- /dev/null
+++ b/src/Storage/Key.hs
@@ -0,0 +1,36 @@
+module Storage.Key (
+    KeyPair(..),
+    storeKey, loadKey,
+) where
+
+import Data.ByteArray
+import qualified Data.ByteString.Char8 as BC
+import qualified Data.ByteString.Lazy as BL
+
+import System.FilePath
+import System.IO.Error
+
+import Storage
+import Storage.Internal
+
+class Storable pub => KeyPair sec pub | sec -> pub, pub -> sec where
+    generateKeys :: Storage -> IO (sec, Stored pub)
+    keyGetPublic :: sec -> Stored pub
+    keyGetData :: sec -> ScrubbedBytes
+    keyFromData :: ScrubbedBytes -> Stored pub -> Maybe sec
+
+
+keyStorage :: Storage -> FilePath
+keyStorage (Storage base) = base </> "keys"
+
+keyFilePath :: KeyPair sec pub => Stored pub -> FilePath
+keyFilePath pkey = keyStorage (storedStorage pkey) </> (BC.unpack $ showRef $ storedRef pkey)
+
+storeKey :: KeyPair sec pub => sec -> IO ()
+storeKey key = writeFileOnce (keyFilePath $ keyGetPublic key) (BL.fromStrict $ convert $ keyGetData key)
+
+loadKey :: KeyPair sec pub => Stored pub -> IO (Maybe sec)
+loadKey spub = do
+    tryIOError (BC.readFile (keyFilePath spub)) >>= \case
+        Right kdata -> return $ keyFromData (convert kdata) spub
+        Left _ -> return Nothing
-- 
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