From f223d2e00c10148bb03c145ca2f971a2de9c0f72 Mon Sep 17 00:00:00 2001
From: Dennis Reimann <mail@dennisreimann.de>
Date: Wed, 3 Feb 2021 16:33:47 +0100
Subject: [PATCH] Add Specter wallet file import

Closes #2223.
---
 BTCPayServer.Tests/UnitTest1.cs               | 12 +++++++++-
 BTCPayServer/DerivationSchemeSettings.cs      | 23 +++++++++++++++++--
 ...vationSchemes_HardwareWalletDialogs.cshtml |  4 ++++
 3 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/BTCPayServer.Tests/UnitTest1.cs b/BTCPayServer.Tests/UnitTest1.cs
index c3fb9f0b9..dd2315fb9 100644
--- a/BTCPayServer.Tests/UnitTest1.cs
+++ b/BTCPayServer.Tests/UnitTest1.cs
@@ -3195,6 +3195,8 @@ namespace BTCPayServer.Tests
             var root = new Mnemonic(
                     "usage fever hen zero slide mammal silent heavy donate budget pulse say brain thank sausage brand craft about save attract muffin advance illegal cabbage")
                 .DeriveExtKey();
+
+            // ColdCard
             Assert.True(DerivationSchemeSettings.TryParseFromWalletFile(
                 "{\"keystore\": {\"ckcc_xpub\": \"xpub661MyMwAqRbcGVBsTGeNZN6QGVHmMHLdSA4FteGsRrEriu4pnVZMZWnruFFFXkMnyoBjyHndD3Qwcfz4MPzBUxjSevweNFQx7SAYZATtcDw\", \"xpub\": \"ypub6WWc2gWwHbdnAAyJDnR4SPL1phRh7REqrPBfZeizaQ1EmTshieRXJC3Z5YoU4wkcdKHEjQGkh6AYEzCQC1Kz3DNaWSwdc1pc8416hAjzqyD\", \"label\": \"Coldcard Import 0x60d1af8b\", \"ckcc_xfp\": 1624354699, \"type\": \"hardware\", \"hw_type\": \"coldcard\", \"derivation\": \"m/49'/0'/0'\"}, \"wallet_type\": \"standard\", \"use_encryption\": false, \"seed_version\": 17}",
                 mainnet, out var settings));
@@ -3208,7 +3210,6 @@ namespace BTCPayServer.Tests
                 settings.AccountOriginal);
             Assert.Equal(root.Derive(new KeyPath("m/49'/0'/0'")).Neuter().PubKey.WitHash.ScriptPubKey.Hash.ScriptPubKey,
                 settings.AccountDerivation.GetDerivation().ScriptPubKey);
-
             var testnet = new BTCPayNetworkProvider(ChainName.Testnet).GetNetwork<BTCPayNetwork>("BTC");
 
             // Should be legacy
@@ -3229,6 +3230,15 @@ namespace BTCPayServer.Tests
                 "{\"keystore\": {\"ckcc_xpub\": \"tpubD6NzVbkrYhZ4YHNiuTdTmHRmbcPRLfqgyneZFCL1mkzkUBjXriQShxTh9HL34FK2mhieasJVk9EzJrUfkFqRNQBjiXgx3n5BhPkxKBoFmaS\", \"xpub\": \"vpub5YjYxTemJ39tFRnuAhwduyxG2tKGjoEpmvqVQRPqdYrqa6YGoeSzBtHXaJUYB19zDbXs3JjbEcVWERjQBPf9bEfUUMZNMv1QnMyHV8JPqyf\", \"label\": \"Coldcard Import 0x60d1af8b\", \"ckcc_xfp\": 1624354699, \"type\": \"hardware\", \"hw_type\": \"coldcard\", \"derivation\": \"m/84'/1'/0'\"}, \"wallet_type\": \"standard\", \"use_encryption\": false, \"seed_version\": 17}",
                 testnet, out settings));
             Assert.True(settings.AccountDerivation is DirectDerivationStrategy s3 && s3.Segwit);
+
+            // Specter
+            Assert.True(DerivationSchemeSettings.TryParseFromWalletFile(
+                "{\"label\": \"Specter\", \"blockheight\": 123456, \"descriptor\": \"wpkh([8bafd160/49h/0h/0h]xpub661MyMwAqRbcGVBsTGeNZN6QGVHmMHLdSA4FteGsRrEriu4pnVZMZWnruFFFXkMnyoBjyHndD3Qwcfz4MPzBUxjSevweNFQx7SAYZATtcDw/0/*)#9x4vkw48\"}",
+                mainnet, out var specter));
+            Assert.Equal(root.GetPublicKey().GetHDFingerPrint(), specter.AccountKeySettings[0].RootFingerprint);
+            Assert.Equal(specter.AccountKeySettings[0].RootFingerprint, hd);
+            Assert.Equal("49'/0'/0'", specter.AccountKeySettings[0].AccountKeyPath.ToString());
+            Assert.Equal("Specter", specter.Label);
         }
 
 
diff --git a/BTCPayServer/DerivationSchemeSettings.cs b/BTCPayServer/DerivationSchemeSettings.cs
index 3124ef79f..ae7b0103e 100644
--- a/BTCPayServer/DerivationSchemeSettings.cs
+++ b/BTCPayServer/DerivationSchemeSettings.cs
@@ -114,7 +114,7 @@ namespace BTCPayServer
                 return false;
             }
 
-            //electrum
+            // Electrum
             if (jobj.ContainsKey("keystore"))
             {
                 result.Source = "ElectrumFile";
@@ -153,10 +153,29 @@ namespace BTCPayServer
                     catch { return false; }
                 }
             }
+            // Specter
+            else if (jobj.ContainsKey("descriptor") && jobj.ContainsKey("blockheight"))
+            {
+                result.Source = "SpecterFile";
+
+                if (!TryParseXpub(jobj["descriptor"].Value<string>(), derivationSchemeParser, ref result, false))
+                {
+                    return false;
+                }
+
+                if (jobj.ContainsKey("label"))
+                {
+                    try
+                    {
+                        result.Label = jobj["label"].Value<string>();
+                    }
+                    catch { return false; }
+                }
+            }
+            // Wasabi
             else
             {
                 result.Source = "WasabiFile";
-                //wasabi format 
                 if (!jobj.ContainsKey("ExtPubKey") ||
                     !TryParseXpub(jobj["ExtPubKey"].Value<string>(), derivationSchemeParser, ref result, false))
                 {
diff --git a/BTCPayServer/Views/Stores/AddDerivationSchemes_HardwareWalletDialogs.cshtml b/BTCPayServer/Views/Stores/AddDerivationSchemes_HardwareWalletDialogs.cshtml
index 1c04f7df3..b292c899b 100644
--- a/BTCPayServer/Views/Stores/AddDerivationSchemes_HardwareWalletDialogs.cshtml
+++ b/BTCPayServer/Views/Stores/AddDerivationSchemes_HardwareWalletDialogs.cshtml
@@ -48,6 +48,10 @@
                             <td>Wasabi</td>
                             <td><kbd>Tools ❯ Wallet Manager ❯ Open Wallets Folder</kbd></td>
                         </tr>
+                        <tr>
+                            <td>Specter</td>
+                            <td><kbd>Wallet ❯ Settings ❯ Export ❯ Export To Wallet Software ❯ Save wallet file</kbd></td>
+                        </tr>
                     </tbody>
                 </table>
                 <div class="form-group">