feat(wallet): coin selection, tx factory, wallet loader

2026-06-11 10:47:40 +02:00
parent 4d2ae1fd13
commit 3d6597a3b2
3 changed files with 213 additions and 0 deletions
@@ -0,0 +1,59 @@
+using NBitcoin;
+using PalladiumWallet.Core.Chain;
+using PalladiumWallet.Core.Crypto;
+using PalladiumWallet.Core.Storage;
+
+namespace PalladiumWallet.Core.Wallet;
+
+/// <summary>
+/// Ponte documento wallet ↔ dominio (blueprint §4.5): dal file ricostruisce
+/// l'HdAccount giusto (da seed o watch-only da xpub). È l'embrione della
+/// factory dei tipi di wallet; crescerà con multisig e importati.
+/// </summary>
+public static class WalletLoader
+{
+    public static ChainProfile ProfileOf(WalletDocument doc) =>
+        ChainProfiles.For(Enum.Parse<NetKind>(doc.Network, ignoreCase: true));
+
+    public static HdAccount ToAccount(WalletDocument doc)
+    {
+        var profile = ProfileOf(doc);
+        var kind = Enum.Parse<ScriptKind>(doc.ScriptKind);
+        var path = KeyPath.Parse(doc.AccountPath);
+
+        if (doc.Mnemonic is { } words)
+        {
+            if (!Bip39.TryParse(words, out var mnemonic))
+                throw new InvalidDataException("Mnemonica del file wallet non valida.");
+            return HdAccount.FromSeed(Bip39.ToSeed(mnemonic!, doc.Passphrase), kind, profile, path);
+        }
+
+        if (!Slip132.TryDecodePublic(doc.AccountXpub, profile, out var xpub, out _))
+            throw new InvalidDataException("Xpub del file wallet non valida per questa rete.");
+        return HdAccount.FromAccountXpub(xpub!, kind, profile, path);
+    }
+
+    /// <summary>Crea il documento per un nuovo wallet da seed.</summary>
+    public static (WalletDocument Doc, HdAccount Account) NewFromMnemonic(
+        string words, string? passphrase, ScriptKind kind, ChainProfile profile, KeyPath? customPath = null)
+    {
+        if (!Bip39.TryParse(words, out var mnemonic))
+            throw new InvalidDataException("Mnemonica non valida (parole o checksum errati).");
+
+        var account = customPath is null
+            ? HdAccount.FromMnemonic(mnemonic!, passphrase, kind, profile)
+            : HdAccount.FromSeed(Bip39.ToSeed(mnemonic!, passphrase), kind, profile, customPath);
+
+        var doc = new WalletDocument
+        {
+            Network = profile.NetName,
+            ScriptKind = kind.ToString(),
+            Mnemonic = words.Trim(),
+            Passphrase = passphrase,
+            AccountPath = account.AccountPath.ToString(),
+            AccountXpub = account.ToSlip132(),
+            MasterFingerprint = Convert.ToHexString(account.MasterFingerprint.ToBytes()).ToLowerInvariant(),
+        };
+        return (doc, account);
+    }
+}