Add OpenStack Swift API Support (#2066)

Co-authored-by: houseme <housemecn@gmail.com>
Co-authored-by: Copilot <noreply@github.com>

crates/protocols/src/swift/mod.rs

@@ -0,0 +1,64 @@
+// 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.
+
+//! OpenStack Swift API implementation
+//!
+//! This module provides support for the OpenStack Swift object storage API,
+//! enabling RustFS to serve as a Swift-compatible storage backend while
+//! reusing the existing S3 storage layer.
+//!
+//! # Architecture
+//!
+//! Swift requests follow the pattern: `/v1/{account}/{container}/{object}`
+//! where:
+//! - `account`: Tenant identifier (e.g., `AUTH_{project_id}`)
+//! - `container`: Swift container (maps to S3 bucket)
+//! - `object`: Object key (maps to S3 object key)
+//!
+//! # Authentication
+//!
+//! Swift API uses Keystone token-based authentication via the existing
+//! `KeystoneAuthMiddleware`. The middleware validates X-Auth-Token headers
+//! and stores credentials in task-local storage, which Swift handlers access
+//! to enforce tenant isolation.
+
+pub mod account;
+pub mod acl;
+pub mod bulk;
+pub mod container;
+pub mod cors;
+pub mod dlo;
+pub mod encryption;
+pub mod errors;
+pub mod expiration;
+pub mod expiration_worker;
+pub mod formpost;
+pub mod handler;
+pub mod object;
+pub mod quota;
+pub mod ratelimit;
+pub mod router;
+pub mod slo;
+pub mod staticweb;
+pub mod symlink;
+pub mod sync;
+pub mod tempurl;
+pub mod types;
+pub mod versioning;
+
+pub use errors::{SwiftError, SwiftResult};
+pub use router::{SwiftRoute, SwiftRouter};
+// Note: Container, Object, and SwiftMetadata types used by Swift implementation
+#[allow(unused_imports)]
+pub use types::{Container, Object, SwiftMetadata};