From ec42d7bb3ba7374b3d0afcd6e2c9e9b616679105 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Mon, 31 Mar 2025 20:27:34 +0200
Subject: Replace uuid package with custom module

Avoids transitive denpednecies not buildable with wasm backend.
---
 src/Erebos/UUID.hs | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 src/Erebos/UUID.hs

(limited to 'src/Erebos/UUID.hs')

diff --git a/src/Erebos/UUID.hs b/src/Erebos/UUID.hs
new file mode 100644
index 0000000..353cc0e
--- /dev/null
+++ b/src/Erebos/UUID.hs
@@ -0,0 +1,78 @@
+module Erebos.UUID (
+    UUID,
+    toString, fromString,
+    toText, fromText,
+    toASCIIBytes, fromASCIIBytes,
+    nextRandom,
+) where
+
+import Control.Monad
+
+import Crypto.Random.Entropy
+
+import Data.Bits
+import Data.ByteString (ByteString)
+import Data.ByteString qualified as BS
+import Data.ByteString.Char8 qualified as BSC
+import Data.Text (Text)
+import Data.Text.Encoding
+
+import Erebos.Util
+
+
+newtype UUID = UUID ByteString
+    deriving (Eq, Ord)
+
+instance Show UUID where
+    show = toString
+
+
+toString :: UUID -> String
+toString = BSC.unpack . toASCIIBytes
+
+fromString :: String -> Maybe UUID
+fromString = fromASCIIBytes . BSC.pack
+
+toText :: UUID -> Text
+toText = decodeUtf8 . toASCIIBytes
+
+fromText :: Text -> Maybe UUID
+fromText = fromASCIIBytes . encodeUtf8
+
+toASCIIBytes :: UUID -> ByteString
+toASCIIBytes (UUID uuid) = BS.concat
+    [ showHex $ BS.take 4 $            uuid
+    , BSC.singleton '-'
+    , showHex $ BS.take 2 $ BS.drop  4 uuid
+    , BSC.singleton '-'
+    , showHex $ BS.take 2 $ BS.drop  6 uuid
+    , BSC.singleton '-'
+    , showHex $ BS.take 2 $ BS.drop  8 uuid
+    , BSC.singleton '-'
+    , showHex             $ BS.drop 10 uuid
+    ]
+
+fromASCIIBytes :: ByteString -> Maybe UUID
+fromASCIIBytes bs = do
+    guard $ BS.length bs == 36
+    guard $ BSC.index bs 8 == '-'
+    guard $ BSC.index bs 13 == '-'
+    guard $ BSC.index bs 18 == '-'
+    guard $ BSC.index bs 23 == '-'
+    UUID . BS.concat <$> sequence
+        [ readHex $ BS.take 8 $            bs
+        , readHex $ BS.take 4 $ BS.drop 9  bs
+        , readHex $ BS.take 4 $ BS.drop 14 bs
+        , readHex $ BS.take 4 $ BS.drop 19 bs
+        , readHex             $ BS.drop 24 bs
+        ]
+
+
+nextRandom :: IO UUID
+nextRandom = do
+    [ b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, ba, bb, bc, bd, be, bf ]
+        <- BS.unpack <$> getEntropy 16
+    let version = 4
+        b6' = b6 .&. 0x0f .|. (version `shiftL` 4)
+        b8' = b8 .&. 0x3f .|. 0x80
+    return $ UUID $ BS.pack [ b0, b1, b2, b3, b4, b5, b6', b7, b8', b9, ba, bb, bc, bd, be, bf ]
-- 
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