Add constants to library

Reviewed-on: #20

src/ZcashHaskell/Transparent.hs

@@ -26,19 +26,12 @@ import ZcashHaskell.Types
   ( TransparentAddress(..)
   , TransparentType(..)
   , ZcashNet(..)
+  , getTransparentPrefix
   )
 
 encodeTransparent :: TransparentAddress -> T.Text
 encodeTransparent t =
-  case ta_type t of
+  encodeTransparent' (getTransparentPrefix (ta_net t) (ta_type t)) $ ta_bytes t
-    P2SH ->
-      case ta_net t of
-        MainNet -> encodeTransparent' (0x1c, 0xbd) $ ta_bytes t
-        _ -> encodeTransparent' (0x1c, 0xba) $ ta_bytes t
-    P2PKH ->
-      case ta_net t of
-        MainNet -> encodeTransparent' (0x1c, 0xb8) $ ta_bytes t
-        _ -> encodeTransparent' (0x1d, 0x25) $ ta_bytes t
   where
     encodeTransparent' :: (Word8, Word8) -> BS.ByteString -> T.Text
     encodeTransparent' (a, b) h =

src/ZcashHaskell/Types.hs

@@ -64,7 +64,7 @@ data ZcashNet
 type AccountId = Int
 
 -- ** Constants
--- | Types for coin types on the different networks
+-- | Type for coin types on the different networks
 data CoinType
   = MainNetCoin
   | TestNetCoin
@@ -77,6 +77,57 @@ getValue c =
     TestNetCoin -> 1
     RegTestNetCoin -> 1
 
+-- | Type for Sapling Human-readable part
+data SaplingHrp
+  = SapExtSpendingKey
+  | SapExtFullViewingKey
+  | SapPaymentAddress
+  | SapTestExtSpendingKey
+  | SapTestExtFullViewingKey
+  | SapTestPaymentAddress
+
+getSaplingHrp :: SaplingHrp -> String
+getSaplingHrp s =
+  case s of
+    SapExtSpendingKey -> "secret-extended-key-main"
+    SapExtFullViewingKey -> "zxviews"
+    SapPaymentAddress -> "zs"
+    SapTestExtSpendingKey -> "secret-extended-key-test"
+    SapTestExtFullViewingKey -> "zxviewtestsapling"
+    SapTestPaymentAddress -> "ztestsapling"
+
+-- | Type for Unified Human-readable part
+data UnifiedHrp
+  = UniPaymentAddress
+  | UniFullViewingKey
+  | UniIncomingViewingKey
+  | UniTestPaymentAddress
+  | UniTestFullViewingKey
+  | UniTestIncomingViewingKey
+
+getUnifiedHrp :: UnifiedHrp -> String
+getUnifiedHrp s =
+  case s of
+    UniPaymentAddress -> "u"
+    UniFullViewingKey -> "uview"
+    UniIncomingViewingKey -> "uivk"
+    UniTestPaymentAddress -> "utest"
+    UniTestFullViewingKey -> "uviewtest"
+    UniTestIncomingViewingKey -> "uivktest"
+
+-- | Function to get the Base58 prefix for encoding a 'TransparentAddress'
+getTransparentPrefix :: ZcashNet -> TransparentType -> (Word8, Word8)
+getTransparentPrefix n t =
+  case t of
+    P2SH ->
+      case n of
+        MainNet -> (0x1c, 0xbd)
+        _ -> (0x1c, 0xba)
+    P2PKH ->
+      case n of
+        MainNet -> (0x1c, 0xb8)
+        _ -> (0x1d, 0x25)
+
 -- * RPC
 -- | A type to model Zcash RPC calls
 data RpcCall = RpcCall