refactor(sse): decouple encryption from ecstore

crates/ecstore/src/object_api/encryption.rs

@@ -0,0 +1,80 @@
+// 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 async_trait::async_trait;
+use http::{HeaderMap, HeaderValue};
+use std::collections::HashMap;
+use std::error::Error;
+use std::fmt::{Display, Formatter};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ReadEncryptionMode {
+    Direct { base_nonce: [u8; 12] },
+    Object,
+}
+
+pub struct ReadEncryptionMaterial {
+    pub key_bytes: [u8; 32],
+    pub mode: ReadEncryptionMode,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum EncryptionResolutionErrorKind {
+    InvalidRequest,
+    InvalidMetadata,
+    ServiceUnavailable,
+    DecryptionFailed,
+}
+
+#[derive(Debug)]
+pub struct EncryptionResolutionError {
+    kind: EncryptionResolutionErrorKind,
+    message: String,
+}
+
+impl EncryptionResolutionError {
+    pub fn new(kind: EncryptionResolutionErrorKind, message: impl Into<String>) -> Self {
+        Self {
+            kind,
+            message: message.into(),
+        }
+    }
+
+    pub fn kind(&self) -> EncryptionResolutionErrorKind {
+        self.kind
+    }
+}
+
+impl Display for EncryptionResolutionError {
+    fn fmt(&self, formatter: &mut Formatter<'_>) -> std::fmt::Result {
+        formatter.write_str(&self.message)
+    }
+}
+
+impl Error for EncryptionResolutionError {}
+
+pub struct ReadEncryptionRequest<'a> {
+    pub bucket: &'a str,
+    pub object: &'a str,
+    pub metadata: &'a HashMap<String, String>,
+    pub headers: &'a HeaderMap<HeaderValue>,
+}
+
+#[async_trait]
+pub trait ObjectEncryptionResolver: Send + Sync {
+    async fn resolve_read_material(
+        &self,
+        request: ReadEncryptionRequest<'_>,
+    ) -> Result<Option<ReadEncryptionMaterial>, EncryptionResolutionError>;
+}