[kms] Add feature to sign ethereum transaction

kms/Cargo.toml

@@ -21,18 +21,27 @@ serde_json = "1.0"
 thiserror = "1.0"
 prost-types = "0.12"
 
+# ethereum
+ethers-core = { version = "2.0", optional = true}
+ethers-signers = { version = "2.0", optional = true}
+async-trait = { version = "0.1", optional = true }
+k256 = { version = "0.13", features = ["pem"], optional = true}
+
 [dev-dependencies]
 tokio = { version="1.32", features=["rt-multi-thread"] }
 serial_test = "3.1"
 tracing-subscriber = { version="0.3.17", features=["env-filter"]}
 ctor = "0.1"
 tokio-util =  {version ="0.7", features = ["codec"] }
 google-cloud-auth = { path = "../foundation/auth", default-features=false }
+hex-literal = "0.4"
+ethers = "2.0"
 
 [features]
 default = ["default-tls", "auth"]
 default-tls = ["google-cloud-auth?/default-tls"]
 rustls-tls = ["google-cloud-auth?/rustls-tls"]
 trace = []
 auth = ["google-cloud-auth"]
-external-account = ["google-cloud-auth?/external-account"]
+external-account = ["google-cloud-auth?/external-account"]
+eth = ["ethers-core", "ethers-signers", "async-trait", "k256"]

kms/README.md

@@ -84,7 +84,7 @@ google-cloud-kms = "version"
 
      // list
      match client
-        .list_key_rings(
+         .list_key_rings(
              ListKeyRingsRequest {
                  parent: "projects/qovery-gcp-tests/locations/europe-west9".to_string(),
                  page_size: 5,
@@ -121,3 +121,45 @@ google-cloud-kms = "version"
          }
          Err(err) => panic!("err: {:?}", err),
      }
+ }
+```
+
+### Ethereum Integration
+
+Enable 'eth' feature.
+
+```toml
+[dependencies]
+google-cloud-kms = { version="version", features=["eth"] }
+```
+
+ ```rust
+ use ethers::prelude::SignerMiddleware;
+ use ethers::providers::{Http, Middleware, Provider};
+ use ethers_core::types::{TransactionReceipt, TransactionRequest};
+ use ethers_signers::Signer as EthSigner;
+ use google_cloud_kms::client::Client;
+ use google_cloud_kms::signer::ethereum::{Error, Signer};
+
+ pub async fn send_bnb(client: Client, key_name: &str, rpc_node: &str) {
+
+     // BSC testnet
+     let chain_id = 97;
+
+     let signer = Signer::new(client, key_name, chain_id, None).await.unwrap();
+     let provider = Provider::<Http>::try_from(rpc_node).unwrap();
+
+     let signer_address = signer.address();
+     let eth_client = SignerMiddleware::new_with_provider_chain(provider, signer).await.unwrap();
+
+     let tx = TransactionRequest::new()
+             .to(signer_address)
+             .value(100_000_000_000_000_u128)
+             .gas(1_500_000_u64)
+             .gas_price(4_000_000_000_u64)
+             .chain_id(chain_id); 
+
+     let res = eth_client.send_transaction(tx, None).await.unwrap();
+     let receipt: TransactionReceipt = res.confirmations(3).await.unwrap().unwrap();
+ }
+```

kms/src/client.rs

@@ -62,7 +62,7 @@ impl Default for ClientConfig {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct Client {
     kms_client: KmsGrpcClient,
 }
@@ -93,7 +93,6 @@ impl Deref for Client {
 
 #[cfg(test)]
 mod tests {
-
     use serial_test::serial;
 
     use crate::grpc::kms::v1::{

kms/src/grpc/apiv1/kms_client.rs

@@ -40,7 +40,7 @@ fn default_setting() -> RetrySetting {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct Client {
     cm: Arc<ConnectionManager>,
 }

kms/src/lib.rs

@@ -43,7 +43,7 @@
 //!
 //! #### Key ring operations
 //!
-//! ```rust
+//! ```
 //! use std::collections::HashMap;
 //! use prost_types::FieldMask;
 //! use google_cloud_googleapis::cloud::kms::v1::{CreateKeyRingRequest, GetKeyRingRequest, ListKeyRingsRequest};
@@ -111,5 +111,43 @@
 //!         Err(err) => panic!("err: {:?}", err),
 //!     }
 //!}
+//!```
+//!
+//! ### Ethereum Integration
+//!
+//! Enable 'eth' feature.
+//! google-cloud-kms = { version="version", features=["eth"] }
+//!
+//! ```
+//! use ethers::prelude::SignerMiddleware;
+//! use ethers::providers::{Http, Middleware, Provider};
+//! use ethers_core::types::{TransactionReceipt, TransactionRequest};
+//! use ethers_signers::Signer as EthSigner;
+//! use google_cloud_kms::client::Client;
+//! use google_cloud_kms::signer::ethereum::{Error, Signer};
+//!
+//! pub async fn send_bnb(client: Client, key_name: &str, rpc_node: &str) {
+//!
+//!     // BSC testnet
+//!     let chain_id = 97;
+//!
+//!     let signer = Signer::new(client, key_name, chain_id, None).await.unwrap();
+//!     let provider = Provider::<Http>::try_from(rpc_node).unwrap();
+//!     let signer_address = signer.address();
+//!
+//!     let eth_client = SignerMiddleware::new_with_provider_chain(provider, signer).await.unwrap();
+//!
+//!     let tx = TransactionRequest::new()
+//!             .to(signer_address)
+//!             .value(100_000_000_000_000_u128)
+//!             .gas(1_500_000_u64)
+//!             .gas_price(4_000_000_000_u64)
+//!             .chain_id(chain_id);
+//!
+//!     let res = eth_client.send_transaction(tx, None).await.unwrap();
+//!     let receipt: TransactionReceipt = res.confirmations(3).await.unwrap().unwrap();
+//! }
+//! ```
 pub mod client;
 pub mod grpc;
+pub mod signer;