feat!: replace aggregator mnemonic with private key (#201)

* feat: replace aggregator mnemonic with private key

Signed-off-by: Theo Butler <theodusbutler@gmail.com>

* refactor: Remove deprecated key_derive_path

Signed-off-by: Alexis Asseman <alexis@semiotic.ai>

---------

Signed-off-by: Theo Butler <theodusbutler@gmail.com>
Signed-off-by: Alexis Asseman <alexis@semiotic.ai>
Co-authored-by: Alexis Asseman <alexis@semiotic.ai>

tap_aggregator/README.md

@@ -8,13 +8,13 @@ A stateless JSON-RPC service that lets clients request an aggregate receipt from
 A JSON-RPC service for the Timeline Aggregation Protocol that lets clients request an aggregate receipt from a list of
 individual receipts.
 
-Usage: tap_aggregator [OPTIONS] --mnemonic <MNEMONIC>
+Usage: tap_aggregator [OPTIONS] --private-key <PRIVATE_KEY>
 
 Options:
       --port <PORT>
           Port to listen on for JSON-RPC requests [env: TAP_PORT=] [default: 8080]
-      --mnemonic <MNEMONIC>
-          Sender mnemonic to be used to sign Receipt Aggregate Vouchers [env: TAP_MNEMONIC=]
+      --private-key <PRIVATE_KEY>
+          Sender private key for signing Receipt Aggregate Vouchers, as a hex string [env: TAP_PRIVATE_KEY=]
       --max-request-body-size <MAX_REQUEST_BODY_SIZE>
           Maximum request body size in bytes. Defaults to 10MB [env: TAP_MAX_REQUEST_BODY_SIZE=] [default: 10485760]
       --max-response-body-size <MAX_RESPONSE_BODY_SIZE>
@@ -98,7 +98,7 @@ Warning object format (similar to the standard JSON-RPC error object):
 We define these warning codes:
 
 - `-32051` API version deprecation
-  
+
   Also returns an object containing the method's supported versions in the `data` field. Example:
 
   ```json
@@ -134,7 +134,7 @@ If the call fails, the error response format is as described in
 In addition to the official spec, we define a few special errors:
 
 - `-32001` Invalid API version.
-  
+
   Also returns an object containing the method's supported versions in the `data` field. Example:
 
   ```json
@@ -158,7 +158,7 @@ In addition to the official spec, we define a few special errors:
   ```
 
 - `-32002` Aggregation error.
-  
+
   The aggregation function returned an error. Example:
 
   ```json

tap_aggregator/src/aggregator.rs

@@ -118,18 +118,18 @@ mod tests {
 
     use alloy_primitives::Address;
     use alloy_sol_types::{eip712_domain, Eip712Domain};
-    use ethers_signers::{coins_bip39::English, LocalWallet, MnemonicBuilder, Signer};
+    use ethers_signers::{LocalWallet, Signer};
     use rstest::*;
 
     use crate::aggregator;
     use tap_core::{eip_712_signed_message::EIP712SignedMessage, tap_receipt::Receipt};
 
     #[fixture]
     fn keys() -> (LocalWallet, Address) {
-        let wallet: LocalWallet = MnemonicBuilder::<English>::default()
-         .phrase("abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about")
-         .build()
-         .unwrap();
+        let wallet = LocalWallet::from_str(
+            "1ab42cc412b618bdea3a599e3c9bae199ebf030895b039e9db1e30dafb12b727",
+        )
+        .unwrap();
         let address: [u8; 20] = wallet.address().into();
         (wallet, address.into())
     }

tap_aggregator/src/main.rs

@@ -4,12 +4,13 @@
 #![doc = include_str!("../README.md")]
 
 use std::borrow::Cow;
+use std::str::FromStr;
 
 use alloy_primitives::{Address, FixedBytes, U256};
 use alloy_sol_types::Eip712Domain;
 use anyhow::Result;
 use clap::Parser;
-use ethers_signers::{coins_bip39::English, MnemonicBuilder, Signer};
+use ethers_signers::{LocalWallet, Signer};
 use tokio::signal::unix::{signal, SignalKind};
 
 use log::{debug, info};
@@ -24,13 +25,9 @@ struct Args {
     #[arg(long, default_value_t = 8080, env = "TAP_PORT")]
     port: u16,
 
-    /// Sender mnemonic to be used to generate key for signing Receipt Aggregate Vouchers.
-    #[arg(long, env = "TAP_MNEMONIC")]
-    mnemonic: String,
-
-    /// Sender key derive path to be used to generate key for signing Receipt Aggregate Vouchers.
-    #[arg(long, default_value = "m/44'/60'/0'/0/0", env = "TAP_KEY_DERIVE_PATH")]
-    key_derive_path: String,
+    /// Sender private key for signing Receipt Aggregate Vouchers, as a hex string.
+    #[arg(long, env = "TAP_PRIVATE_KEY")]
+    private_key: String,
 
     /// Maximum request body size in bytes.
     /// Defaults to 10MB.
@@ -90,10 +87,7 @@ 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())
-        .derivation_path(&args.key_derive_path)?
-        .build()?;
+    let wallet = LocalWallet::from_str(&args.private_key)?;
 
     info!("Wallet address: {:#40x}", wallet.address());