Recover wallet from 256bit string through REST endpoint

The choice of using a 256 bit string is temporary. This will be replaced
in favour of a 24 word seed phrase which will be used to create the
seed (BIP39).

daemon/src/lib.rs

@@ -332,7 +332,8 @@ where
     W: xtra::Handler<wallet::BuildPartyParams>
         + xtra::Handler<wallet::Sign>
         + xtra::Handler<wallet::TryBroadcastTransaction>
-        + xtra::Handler<wallet::Withdraw>,
+        + xtra::Handler<wallet::Withdraw>
+        + xtra::Handler<wallet::Reinitialise>,
 {
     #[allow(clippy::too_many_arguments)]
     pub async fn new<FM, FO>(
@@ -456,4 +457,12 @@ where
             })
             .await?
     }
+
+    pub async fn reinitialise_wallet(&self, seed_words: &str) -> Result<()> {
+        self.wallet_actor_addr
+            .send(wallet::Reinitialise {
+                seed_words: seed_words.to_string(),
+            })
+            .await?
+    }
 }

daemon/src/routes_taker.rs

@@ -158,6 +158,28 @@ pub async fn post_cfd_action(
     Ok(status::Accepted(None))
 }
 
+#[derive(Debug, Clone, Deserialize)]
+pub struct WalletReinitialiseRequest {
+    pub seed_words: String,
+}
+
+#[rocket::post("/wallet/reinitialise", data = "<wallet_reinitialise_request>")]
+pub async fn post_wallet_reinitialise(
+    wallet_reinitialise_request: Json<WalletReinitialiseRequest>,
+    taker: &State<Taker>,
+) -> Result<status::Accepted<()>, HttpApiProblem> {
+    taker
+        .reinitialise_wallet(&wallet_reinitialise_request.seed_words)
+        .await
+        .map_err(|e| {
+            HttpApiProblem::new(StatusCode::INTERNAL_SERVER_ERROR)
+                .title("Wallet recover request failed")
+                .detail(e.to_string())
+        })?;
+
+    Ok(status::Accepted(None))
+}
+
 #[rocket::get("/alive")]
 pub fn get_health_check() {}
 

daemon/src/taker.rs

@@ -289,6 +289,7 @@ async fn main() -> Result<()> {
                 routes_taker::margin_calc,
                 routes_taker::post_cfd_action,
                 routes_taker::post_withdraw_request,
+                routes_taker::post_wallet_reinitialise,
             ],
         )
         .mount(

daemon/src/wallet.rs

@@ -1,5 +1,6 @@
 use crate::model::Timestamp;
 use crate::model::WalletInfo;
+use crate::tokio_ext::spawn_fallible;
 use crate::Tasks;
 use anyhow::bail;
 use anyhow::Context;
@@ -40,6 +41,7 @@ pub struct Actor {
     used_utxos: HashSet<OutPoint>,
     tasks: Tasks,
     sender: watch::Sender<Option<WalletInfo>>,
+    electrum_rpc_url: String,
 }
 
 #[derive(thiserror::Error, Debug, Clone, Copy)]
@@ -70,6 +72,7 @@ impl Actor {
             tasks: Tasks::default(),
             sender,
             used_utxos: HashSet::default(),
+            electrum_rpc_url: electrum_rpc_url.to_string(),
         };
 
         Ok((actor, receiver))
@@ -131,6 +134,41 @@ impl Actor {
 
 #[xtra_productivity]
 impl Actor {
+    pub fn handle_reinitialise(
+        &mut self,
+        msg: Reinitialise,
+        ctx: &mut xtra::Context<Self>,
+    ) -> Result<()> {
+        let client = bdk::electrum_client::Client::new(&self.electrum_rpc_url)
+            .context("Failed to initialize Electrum RPC client")?;
+
+        let ext_priv_key =
+            ExtendedPrivKey::new_master(self.wallet.network(), msg.seed_words.as_bytes())?;
+
+        let db = bdk::database::MemoryDatabase::new();
+
+        let wallet = bdk::Wallet::new(
+            bdk::template::Bip84(ext_priv_key, KeychainKind::External),
+            Some(bdk::template::Bip84(ext_priv_key, KeychainKind::Internal)),
+            ext_priv_key.network,
+            db,
+            ElectrumBlockchain::from(client),
+        )?;
+
+        self.wallet = wallet;
+
+        self.used_utxos.clear();
+
+        let this = ctx.address().expect("self to be alive");
+
+        spawn_fallible::<_, anyhow::Error>(async move {
+            let _ = this.send(Sync).await?;
+            Ok(())
+        });
+
+        Ok(())
+    }
+
     pub fn handle_sync(&mut self, _msg: Sync) -> Result<()> {
         let wallet_info_update = match self.sync_internal() {
             Ok(wallet_info) => Some(wallet_info),
@@ -304,6 +342,10 @@ pub struct BuildPartyParams {
 /// Private message to trigger a sync.
 struct Sync;
 
+pub struct Reinitialise {
+    pub seed_words: String,
+}
+
 pub struct Sign {
     pub psbt: PartiallySignedTransaction,
 }

daemon/tests/harness/mocks/wallet.rs

@@ -41,6 +41,9 @@ impl WalletActor {
     async fn handle(&mut self, msg: wallet::Withdraw) -> Result<Txid> {
         self.mock.lock().await.withdraw(msg)
     }
+    async fn handle(&mut self, msg: wallet::Reinitialise) -> Result<()> {
+        self.mock.lock().await.reinitialise(msg)
+    }
 }
 
 #[automock]
@@ -60,6 +63,10 @@ pub trait Wallet {
     fn withdraw(&mut self, _msg: wallet::Withdraw) -> Result<Txid> {
         unreachable!("mockall will reimplement this method")
     }
+
+    fn reinitialise(&mut self, _msg: wallet::Reinitialise) -> Result<()> {
+        unreachable!("mockall will reimplement this method")
+    }
 }
 
 #[allow(dead_code)]