refactor(iam): introduce federated identity boundary (#5018)

crates/iam/src/federation/binding.rs

@@ -0,0 +1,24 @@
+// Copyright 2024 RustFS Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use super::{FederatedSessionBindingError, FederatedSessionTransaction};
+use rustfs_credentials::Credentials;
+
+#[async_trait::async_trait]
+pub trait FederatedSessionBinding: Send + Sync {
+    async fn bind(
+        &self,
+        transaction: &FederatedSessionTransaction,
+    ) -> core::result::Result<Credentials, FederatedSessionBindingError>;
+}