feat(tap-aggregator): allow argument for key derive path to be used with mnemonic

Signed-off-by: Bryan Cole <[email protected]>

Author: ColePBryan

tap_aggregator/src/main.rs

@@ -24,10 +24,14 @@ struct Args {
     #[arg(long, default_value_t = 8080, env = "TAP_PORT")]
     port: u16,
 
-    /// Gateway mnemonic to be used to sign Receipt Aggregate Vouchers.
+    /// Gateway mnemonic to be used to generate key for signing Receipt Aggregate Vouchers.
     #[arg(long, env = "TAP_MNEMONIC")]
     mnemonic: String,
 
+    /// Gateway key derive path to be used to generate key for signing Receipt Aggregate Vouchers.
+    #[arg(long, env = "TAP_KEY_DERIVE_PATH")]
+    key_derive_path: Option<String>,
+
     /// Maximum request body size in bytes.
     /// Defaults to 10MB.
     #[arg(long, default_value_t = 10 * 1024 * 1024, env = "TAP_MAX_REQUEST_BODY_SIZE")]
@@ -86,9 +90,18 @@ async fn main() -> Result<()> {
     tokio::spawn(metrics::run_server(args.metrics_port));
 
     // Create a wallet from the mnemonic.
-    let wallet = MnemonicBuilder::<English>::default()
-        .phrase(args.mnemonic.as_str())
-        .build()?;
+    let wallet = if let Some(key_derive_path) = args.key_derive_path.as_deref() {
+        info!("Creating wallet from mnemonic and key derive path...");
+        MnemonicBuilder::<English>::default()
+            .phrase(args.mnemonic.as_str())
+            .derivation_path(key_derive_path)?
+            .build()?
+    } else {
+        info!("Creating wallet from mnemonic...");
+        MnemonicBuilder::<English>::default()
+            .phrase(args.mnemonic.as_str())
+            .build()?
+    };
 
     // Create the EIP-712 domain separator.
     let domain_separator = create_eip712_domain(&args)?;