Add GetSignatureFormat method to return signature template

Co-Authored-By: Chris Li <chris.li.2046@gmail.com>

Author: devin-ai-integration[bot]

aggregator/auth.go

@@ -185,3 +185,9 @@ func (r *RpcServer) verifyOperator(ctx context.Context, operatorAddr string) (bo
 
 	return auth.VerifyOperator(authRawHeaders[0], operatorAddr)
 }
+
+func (r *RpcServer) GetSignatureFormat(ctx context.Context, req *avsproto.GetSignatureFormatReq) (*avsproto.GetSignatureFormatResp, error) {
+	return &avsproto.GetSignatureFormatResp{
+		Format: authTemplate,
+	}, nil
+}

protobuf/avs.proto

@@ -658,10 +658,21 @@ message DeleteSecretReq {
   string org_id = 3;
 }
 
+message GetSignatureFormatReq {
+  // Empty request
+}
+
+message GetSignatureFormatResp {
+  // The template format for signature messages
+  string format = 1;
+}
 
 service Aggregator {
   // Exchange for an Auth Key to authenticate in subsequent request
   rpc GetKey(GetKeyReq) returns (KeyResp) {};
+  
+  // Get the signature format template used for authentication
+  rpc GetSignatureFormat(GetSignatureFormatReq) returns (GetSignatureFormatResp) {};
 
   // Smart Acccount Operation
   rpc GetNonce(NonceRequest)        returns (NonceResp) {};