wallet: add support for initiating from seed file

app/Cargo.toml

@@ -6,6 +6,7 @@ publish.workspace = true
 version.workspace = true
 
 [dependencies]
+bdk_wallet = { workspace = true }
 bip300301 = { workspace = true }
 bip300301_enforcer_lib = { path = "../lib", default-features = false }
 bitcoin = { workspace = true }

app/main.rs

@@ -1,5 +1,6 @@
 use std::{future::Future, net::SocketAddr, path::Path, time::Duration};
 
+use bdk_wallet::bip39::{Language, Mnemonic};
 use bip300301::MainClient;
 use clap::Parser;
 use either::Either;
@@ -539,11 +540,28 @@ async fn main() -> Result<()> {
         )
         .await?;
 
-        if !wallet.is_initialized().await && cli.wallet_opts.auto_create {
+        let (mnemonic, auto_create) = match (
+            cli.wallet_opts.mnemonic_path.clone(),
+            cli.wallet_opts.auto_create,
+        ) {
+            (Some(mnemonic_path), _) => {
+                tracing::debug!("Reading mnemonic from file: {}", mnemonic_path.display());
+
+                let mnemonic_str = std::fs::read_to_string(mnemonic_path)
+                    .map_err(|err| miette!("failed to read mnemonic file: {}", err))?;
+
+                let mnemonic = Mnemonic::parse_in(Language::English, &mnemonic_str)
+                    .map_err(|err| miette!("invalid mnemonic: {}", err))?;
+
+                (Some(mnemonic), true)
+            }
+            (_, true) => (None, true),
+            _ => (None, false),
+        };
+
+        if !wallet.is_initialized().await && auto_create {
             tracing::info!("auto-creating new wallet");
-            let mnemonic = None;
-            let password = None;
-            wallet.create_wallet(mnemonic, password).await?;
+            wallet.create_wallet(mnemonic, None).await?;
         }
 
         Either::Right(wallet)

lib/cli.rs

@@ -243,7 +243,11 @@ pub enum WalletSyncSource {
 pub struct WalletConfig {
     /// If no existing wallet is found, automatically create and load
     /// a new, unencrypted wallet from a randomly generated BIP39 mnemonic.
-    #[arg(long = "wallet-auto-create", default_value_t = false)]
+    #[arg(
+        long = "wallet-auto-create",
+        default_value_t = false,
+        conflicts_with = "wallet-seed-file"
+    )]
     pub auto_create: bool,
     /// URL of the Esplora server to use for the wallet.
     ///
@@ -271,6 +275,10 @@ pub struct WalletConfig {
     /// The source of the wallet sync.
     #[arg(long = "wallet-sync-source", default_value_t = WalletSyncSource::Electrum, value_enum)]
     pub sync_source: WalletSyncSource,
+
+    /// Path to a file containing exactly 12 space-separated BIP39 mnemonic words.
+    #[arg(long = "wallet-seed-file", conflicts_with = "wallet-auto-create")]
+    pub mnemonic_path: Option<PathBuf>,
 }
 
 const DEFAULT_SERVE_RPC_ADDR: SocketAddr =

lib/wallet/mod.rs

@@ -60,7 +60,7 @@ use crate::{
 mod cusf_block_producer;
 pub mod error;
 mod mine;
-mod mnemonic;
+pub mod mnemonic;
 mod sync;
 mod util;