Enhance Solana transaction support and add new dependencies

server/Cargo.toml

@@ -13,6 +13,7 @@ vault-sdk = { workspace = true }
 vault-types = { workspace = true }
 engine-core = { path = "../core" }
 engine-aa-core = { path = "../aa-core" }
+engine-solana-core = { path = "../solana-core" }
 engine-executors = { path = "../executors" }
 twmq = { path = "../twmq" }
 thirdweb-core = { path = "../thirdweb-core" }
@@ -24,6 +25,10 @@ tracing-subscriber = { workspace = true, features = ["env-filter", "json"] }
 rand = { workspace = true }
 futures = { workspace = true }
 serde-bool = { workspace = true }
+base64 = { workspace = true }
+bincode = { workspace = true }
+solana-sdk = { workspace = true }
+solana-client = { workspace = true }
 aide = { workspace = true, features = [
     "axum",
     "axum-json",

server/src/http/routes/mod.rs

@@ -4,6 +4,7 @@ pub mod contract_read;
 pub mod contract_write;
 
 pub mod sign_message;
+pub mod sign_solana_transaction;
 pub mod sign_typed_data;
 pub mod solana_transaction;
 pub mod transaction;

server/src/http/routes/sign_solana_transaction.rs

@@ -0,0 +1,149 @@
+use axum::{
+    extract::State,
+    http::StatusCode,
+    response::{IntoResponse, Json},
+};
+use base64::{Engine, engine::general_purpose::STANDARD as Base64Engine};
+use bincode::config::standard as bincode_standard;
+use engine_core::{
+    error::EngineError,
+    execution_options::solana::SolanaChainId,
+};
+use engine_solana_core::transaction::SolanaTransaction;
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+use solana_client::nonblocking::rpc_client::RpcClient;
+
+use crate::http::{
+    error::ApiEngineError,
+    extractors::{EngineJson, SigningCredentialsExtractor},
+    server::EngineServerState,
+    types::SuccessResponse,
+};
+
+// ===== REQUEST/RESPONSE TYPES =====
+
+/// Request to sign a Solana transaction
+#[derive(Debug, Clone, Serialize, Deserialize, utoipa::ToSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct SignSolanaTransactionRequest {
+    /// Transaction input (instructions or serialized transaction)
+    #[serde(flatten)]
+    pub input: engine_solana_core::transaction::SolanaTransactionInput,
+
+    /// Solana execution options
+    pub execution_options: engine_core::execution_options::solana::SolanaExecutionOptions,
+}
+
+/// Data returned from successful signing
+#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema, utoipa::ToSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct SignSolanaTransactionResponse {
+    /// The signature (base58-encoded)
+    pub signature: String,
+    /// The signed serialized transaction (base64-encoded)
+    pub signed_transaction: String,
+}
+
+// ===== ROUTE HANDLER =====
+
+#[utoipa::path(
+    post,
+    operation_id = "signSolanaTransaction",
+    path = "/solana/sign/transaction",
+    tag = "Solana",
+    request_body(content = SignSolanaTransactionRequest, description = "Sign Solana transaction request", content_type = "application/json"),
+    responses(
+        (status = 200, description = "Successfully signed Solana transaction", body = SuccessResponse<SignSolanaTransactionResponse>, content_type = "application/json"),
+    ),
+    params(
+        ("x-vault-access-token" = Option<String>, Header, description = "Vault access token"),
+    )
+)]
+/// Sign Solana Transaction
+///
+/// Sign a Solana transaction without broadcasting it
+pub async fn sign_solana_transaction(
+    State(state): State<EngineServerState>,
+    SigningCredentialsExtractor(signing_credential): SigningCredentialsExtractor,
+    EngineJson(request): EngineJson<SignSolanaTransactionRequest>,
+) -> Result<impl IntoResponse, ApiEngineError> {
+    let chain_id = request.execution_options.chain_id;
+    let signer_address = request.execution_options.signer_address;
+
+    tracing::info!(
+        chain_id = %chain_id.as_str(),
+        signer = %signer_address,
+        "Processing Solana transaction signing request"
+    );
+
+    // Get RPC URL for the chain
+    let rpc_url = get_rpc_url(chain_id);
+
+    // Create RPC client
+    let rpc_client = RpcClient::new(rpc_url.to_string());
+
+    // Get recent blockhash
+    let recent_blockhash = rpc_client
+        .get_latest_blockhash()
+        .await
+        .map_err(|e| {
+            ApiEngineError(EngineError::ValidationError {
+                message: format!("Failed to get recent blockhash: {}", e),
+            })
+        })?;
+
+    // Build the transaction
+    let solana_tx = SolanaTransaction {
+        input: request.input,
+        compute_unit_limit: request.execution_options.compute_unit_limit,
+        compute_unit_price: None, // Will be set if priority fee is configured
+    };
+
+    // Convert to versioned transaction
+    let versioned_tx = solana_tx
+        .to_versioned_transaction(signer_address, recent_blockhash)
+        .map_err(|e| {
+            ApiEngineError(EngineError::ValidationError {
+                message: format!("Failed to build transaction: {}", e),
+            })
+        })?;
+
+    // Sign the transaction
+    let signed_tx = state
+        .solana_signer
+        .sign_transaction(versioned_tx, signer_address, &signing_credential)
+        .await
+        .map_err(ApiEngineError)?;
+
+    // Get the signature (first signature in the transaction)
+    let signature = signed_tx.signatures[0];
+
+    // Serialize the signed transaction to base64
+    let signed_tx_bytes = bincode::serde::encode_to_vec(&signed_tx, bincode_standard()).map_err(
+        |e| {
+            ApiEngineError(EngineError::ValidationError {
+                message: format!("Failed to serialize signed transaction: {}", e),
+            })
+        },
+    )?;
+    let signed_tx_base64 = Base64Engine.encode(&signed_tx_bytes);
+
+    let response = SignSolanaTransactionResponse {
+        signature: signature.to_string(),
+        signed_transaction: signed_tx_base64,
+    };
+
+    tracing::info!(
+        chain_id = %chain_id.as_str(),
+        signature = %signature,
+        "Solana transaction signed successfully"
+    );
+
+    Ok((StatusCode::OK, Json(SuccessResponse::new(response))))
+}
+
+/// Get RPC URL for a Solana chain
+fn get_rpc_url(chain_id: SolanaChainId) -> &'static str {
+    chain_id.default_rpc_url()
+}

server/src/http/server.rs

@@ -1,7 +1,7 @@
 use std::sync::Arc;
 
 use axum::{Json, Router, routing::get};
-use engine_core::{signer::EoaSigner, userop::UserOpSigner, credentials::KmsClientCache};
+use engine_core::{signer::{EoaSigner, SolanaSigner}, userop::UserOpSigner, credentials::KmsClientCache};
 use serde_json::json;
 use thirdweb_core::abi::ThirdwebAbiService;
 use tokio::{sync::watch, task::JoinHandle};
@@ -24,6 +24,7 @@ pub struct EngineServerState {
     pub chains: Arc<ThirdwebChainService>,
     pub userop_signer: Arc<UserOpSigner>,
     pub eoa_signer: Arc<EoaSigner>,
+    pub solana_signer: Arc<SolanaSigner>,
     pub abi_service: Arc<ThirdwebAbiService>,
     pub vault_client: Arc<VaultClient>,
 
@@ -66,6 +67,9 @@ impl EngineServer {
             .routes(routes!(
                 crate::http::routes::solana_transaction::send_solana_transaction
             ))
+            .routes(routes!(
+                crate::http::routes::sign_solana_transaction::sign_solana_transaction
+            ))
             .routes(routes!(
                 crate::http::routes::transaction::cancel_transaction
             ))

server/src/main.rs

@@ -1,6 +1,6 @@
 use std::{sync::Arc, time::Duration};
 
-use engine_core::{signer::EoaSigner, userop::UserOpSigner, credentials::KmsClientCache};
+use engine_core::{signer::{EoaSigner, SolanaSigner}, userop::UserOpSigner, credentials::KmsClientCache};
 use engine_executors::{eoa::authorization_cache::EoaAuthorizationCache, metrics::{ExecutorMetrics, initialize_metrics}};
 use thirdweb_core::{abi::ThirdwebAbiServiceBuilder, auth::ThirdwebAuth, iaw::IAWClient};
 use thirdweb_engine::{
@@ -60,7 +60,8 @@ async fn main() -> anyhow::Result<()> {
         vault_client: vault_client.clone(),
         iaw_client: iaw_client.clone(),
     });
-    let eoa_signer = Arc::new(EoaSigner::new(vault_client.clone(), iaw_client));
+    let eoa_signer = Arc::new(EoaSigner::new(vault_client.clone(), iaw_client.clone()));
+    let solana_signer = Arc::new(SolanaSigner::new(vault_client.clone(), iaw_client));
     let redis_client = twmq::redis::Client::open(config.redis.url.as_str())?;
 
     let authorization_cache = EoaAuthorizationCache::new(
@@ -124,6 +125,7 @@ async fn main() -> anyhow::Result<()> {
     let mut server = EngineServer::new(EngineServerState {
         userop_signer: signer.clone(),
         eoa_signer: eoa_signer.clone(),
+        solana_signer: solana_signer.clone(),
         abi_service: Arc::new(abi_service),
         vault_client: Arc::new(vault_client),
         chains,