Support the gcp option in cast wallet list

crates/cast/Cargo.toml

@@ -42,7 +42,7 @@ alloy-provider = { workspace = true, features = [
     "ws",
     "ipc",
     "trace-api",
-    "txpool-api"
+    "txpool-api",
 ] }
 alloy-rlp.workspace = true
 alloy-rpc-types = { workspace = true, features = ["eth", "trace"] }
@@ -63,6 +63,9 @@ serde.workspace = true
 # aws-kms
 aws-sdk-kms = { workspace = true, default-features = false, optional = true }
 
+# gcp-kms
+gcloud-sdk = { version = "0.26.4", default-features = false, optional = true }
+
 # bin
 foundry-cli.workspace = true
 
@@ -93,4 +96,5 @@ default = ["jemalloc"]
 asm-keccak = ["alloy-primitives/asm-keccak"]
 jemalloc = ["dep:tikv-jemallocator"]
 aws-kms = ["foundry-wallets/aws-kms", "dep:aws-sdk-kms"]
+gcp-kms = ["foundry-wallets/gcp-kms", "dep:gcloud-sdk"]
 isolate-by-default = ["foundry-config/isolate-by-default"]

crates/cast/src/cmd/wallet/list.rs

@@ -1,5 +1,6 @@
 use clap::Parser;
 use eyre::Result;
+use std::env;
 
 use foundry_common::{fs, sh_err, sh_println};
 use foundry_config::Config;
@@ -25,6 +26,10 @@ pub struct ListArgs {
     #[arg(long, hide = !cfg!(feature = "aws-kms"))]
     aws: bool,
 
+    /// List accounts from Google Cloud KMS.
+    #[arg(long, hide = !cfg!(feature = "gcp-kms"))]
+    gcp: bool,
+
     /// List all configured accounts.
     #[arg(long, group = "hw-wallets")]
     all: bool,
@@ -37,7 +42,10 @@ pub struct ListArgs {
 impl ListArgs {
     pub async fn run(self) -> Result<()> {
         // list local accounts as files in keystore dir, no need to unlock / provide password
-        if self.dir.is_some() || self.all || (!self.ledger && !self.trezor && !self.aws) {
+        if self.dir.is_some() ||
+            self.all ||
+            (!self.ledger && !self.trezor && !self.aws && !self.gcp)
+        {
             let _ = self.list_local_senders();
         }
 
@@ -47,6 +55,7 @@ impl ListArgs {
             .mnemonic_indexes(Some(vec![0]))
             .trezor(self.trezor || self.all)
             .aws(self.aws || self.all)
+            .gcp(self.gcp || (self.all && gcp_env_vars_set()))
             .interactives(0)
             .build()
             .expect("build multi wallet");
@@ -108,3 +117,10 @@ impl ListArgs {
         Ok(())
     }
 }
+
+fn gcp_env_vars_set() -> bool {
+    let required_vars =
+        ["GCP_PROJECT_ID", "GCP_LOCATION", "GCP_KEY_RING", "GCP_KEY_NAME", "GCP_KEY_VERSION"];
+
+    required_vars.iter().all(|&var| env::var(var).is_ok())
+}

crates/wallets/Cargo.toml

@@ -32,7 +32,7 @@ aws-sdk-kms = { workspace = true, default-features = false, optional = true }
 
 # gcp-kms
 alloy-signer-gcp = { workspace = true, features = ["eip712"], optional = true }
-gcloud-sdk = { version = "0.26", features = [
+gcloud-sdk = { version = "0.26.4", features = [
   "google-cloud-kms-v1",
   "google-longrunning",
 ], optional = true }

crates/wallets/src/multi_wallet.rs

@@ -221,6 +221,10 @@ pub struct MultiWalletOpts {
     /// Use AWS Key Management Service.
     #[arg(long, help_heading = "Wallet options - remote", hide = !cfg!(feature = "aws-kms"))]
     pub aws: bool,
+
+    /// Use Google Cloud Key Management Service.
+    #[arg(long, help_heading = "Wallet options - remote", hide = !cfg!(feature = "gcp-kms"))]
+    pub gcp: bool,
 }
 
 impl MultiWalletOpts {
@@ -238,6 +242,9 @@ impl MultiWalletOpts {
         if let Some(aws_signers) = self.aws_signers().await? {
             signers.extend(aws_signers);
         }
+        if let Some(gcp_signer) = self.gcp_signers().await? {
+            signers.extend(gcp_signer);
+        }
         if let Some((pending_keystores, unlocked)) = self.keystores()? {
             pending.extend(pending_keystores);
             signers.extend(unlocked);
@@ -397,6 +404,43 @@ impl MultiWalletOpts {
 
         Ok(None)
     }
+
+    /// Returns a list of GCP signers if the GCP flag is set.
+    ///
+    /// The GCP signers are created from the following environment variables:
+    /// - GCP_PROJECT_ID: The GCP project ID. e.g. `my-project-123456`.
+    /// - GCP_LOCATION: The GCP location. e.g. `us-central1`.
+    /// - GCP_KEY_RING: The GCP key ring name. e.g. `my-key-ring`.
+    /// - GCP_KEY_NAME: The GCP key name. e.g. `my-key`.
+    /// - GCP_KEY_VERSION: The GCP key version. e.g. `1`.
+    ///
+    /// For more information on GCP KMS, see the [official documentation](https://cloud.google.com/kms/docs).
+    pub async fn gcp_signers(&self) -> Result<Option<Vec<WalletSigner>>> {
+        #[cfg(feature = "gcp-kms")]
+        if self.gcp {
+            let mut wallets = vec![];
+
+            let project_id = std::env::var("GCP_PROJECT_ID")?;
+            let location = std::env::var("GCP_LOCATION")?;
+            let key_ring = std::env::var("GCP_KEY_RING")?;
+            let key_names = std::env::var("GCP_KEY_NAME")?;
+            let key_version = std::env::var("GCP_KEY_VERSION")?;
+
+            let gcp_signer = WalletSigner::from_gcp(
+                project_id,
+                location,
+                key_ring,
+                key_names,
+                key_version.parse()?,
+            )
+            .await?;
+            wallets.push(gcp_signer);
+
+            return Ok(Some(wallets));
+        }
+
+        Ok(None)
+    }
 }
 
 #[cfg(test)]