Merge bitcoin/bitcoin#23721: wallet, refactor: Move restorewallet() logic to the wallet section

62fa61fa4a33ff4d108a65d656ffe2cac4330824 refactor: remove the wallet folder if the restore fails (w0xlt)
abbb7eccef3fc1c36f34756458d2792f6661e29f refactor: Move restorewallet() RPC logic to the wallet section (w0xlt)
4807f73f48f4ff1084fcf7aee94e5b14592bfda8 refactor: Implement restorewallet() logic in the wallet section (w0xlt)

Pull request description:

  Currently `restorewallet()` logic is written in the RPC layer and it can´t be reused by GUI. So it moves this to the wallet section and then, GUI can access it.

  This is necessary to implement the "Restore Wallet" menu item in the GUI (which is already implemented  in https://github.com/bitcoin-core/gui/pull/471 ).

  This commit also simplifies error handling and adds a new behavior: if the restore fails, the invalid wallet folder is removed.

ACKs for top commit:
  achow101:
    ACK 62fa61fa4a33ff4d108a65d656ffe2cac4330824
  shaavan:
    crACK 62fa61fa4a33ff4d108a65d656ffe2cac4330824

Tree-SHA512: 7ccfbad5943f38616ba0c2dd443c97a4b5bc1f6612dbf5a9e7a0263100aba36671fae929a2e7688442667be394645f44484af137a4802f204a33c4689eb27c39

1 files changed, 32 insertions, 0 deletions

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index c79e917c69..decdbc7090 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -357,6 +357,38 @@ std::shared_ptr<CWallet> CreateWallet(WalletContext& context, const std::string&
     return wallet;
 }
 
+std::shared_ptr<CWallet> RestoreWallet(WalletContext& context, const std::string& backup_file, const std::string& wallet_name, std::optional<bool> load_on_start, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings)
+{
+    DatabaseOptions options;
+    options.require_existing = true;
+
+    if (!fs::exists(fs::u8path(backup_file))) {
+        error = Untranslated("Backup file does not exist");
+        status = DatabaseStatus::FAILED_INVALID_BACKUP_FILE;
+        return nullptr;
+    }
+
+    const fs::path wallet_path = fsbridge::AbsPathJoin(GetWalletDir(), fs::u8path(wallet_name));
+
+    if (fs::exists(wallet_path) || !TryCreateDirectories(wallet_path)) {
+        error = Untranslated(strprintf("Failed to create database path '%s'. Database already exists.", fs::PathToString(wallet_path)));
+        status = DatabaseStatus::FAILED_ALREADY_EXISTS;
+        return nullptr;
+    }
+
+    auto wallet_file = wallet_path / "wallet.dat";
+    fs::copy_file(backup_file, wallet_file, fs::copy_option::fail_if_exists);
+
+    auto wallet = LoadWallet(context, wallet_name, load_on_start, options, status, error, warnings);
+
+    if (!wallet) {
+        fs::remove(wallet_file);
+        fs::remove(wallet_path);
+    }
+
+    return wallet;
+}
+
 /** @defgroup mapWallet
  *
  * @{