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

crates/iam/src/federation/error.rs

@@ -0,0 +1,39 @@
+// 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.
+
+pub type Result<T> = core::result::Result<T, FederationError>;
+
+#[derive(Debug, thiserror::Error)]
+pub enum FederatedSessionBindingError {
+    #[error("{0}")]
+    InvalidRequest(String),
+    #[error("{0}")]
+    Internal(String),
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum FederationError {
+    #[error("{0}")]
+    Authorization(String),
+    #[error("{0}")]
+    CodeExchange(String),
+    #[error("{0}")]
+    TokenVerification(String),
+    #[error("{0}")]
+    Logout(String),
+    #[error("no policies are available for this OIDC token")]
+    NoAuthorizationContext,
+    #[error(transparent)]
+    Binding(#[from] FederatedSessionBindingError),
+}