refactor(lifecycle): extract core rule contracts (#4258)

crates/lifecycle/src/object_lock.rs

@@ -0,0 +1,63 @@
+// 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 std::collections::HashMap;
+
+use s3s::dto::ObjectLockRetentionMode;
+use s3s::header::{X_AMZ_OBJECT_LOCK_LEGAL_HOLD, X_AMZ_OBJECT_LOCK_MODE, X_AMZ_OBJECT_LOCK_RETAIN_UNTIL_DATE};
+use time::{OffsetDateTime, format_description};
+
+pub fn is_object_locked_by_metadata(user_defined: &HashMap<String, String>, is_delete_marker: bool) -> bool {
+    if is_delete_marker {
+        return false;
+    }
+
+    if user_defined
+        .get(X_AMZ_OBJECT_LOCK_LEGAL_HOLD.as_str())
+        .is_some_and(|value| value.eq_ignore_ascii_case("ON"))
+    {
+        return true;
+    }
+
+    let Some(mode) = user_defined.get(X_AMZ_OBJECT_LOCK_MODE.as_str()) else {
+        return false;
+    };
+    if !is_retention_mode(mode) {
+        return false;
+    }
+
+    user_defined
+        .get(X_AMZ_OBJECT_LOCK_RETAIN_UNTIL_DATE.as_str())
+        .and_then(|value| OffsetDateTime::parse(value, &format_description::well_known::Iso8601::DEFAULT).ok())
+        .is_some_and(|retain_until| retain_until.unix_timestamp() > OffsetDateTime::now_utc().unix_timestamp())
+}
+
+fn is_retention_mode(mode: &str) -> bool {
+    mode.eq_ignore_ascii_case(ObjectLockRetentionMode::COMPLIANCE)
+        || mode.eq_ignore_ascii_case(ObjectLockRetentionMode::GOVERNANCE)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn is_object_locked_by_metadata_preserves_object_lock_parser_behavior() {
+        let mut user_defined = HashMap::new();
+        user_defined.insert(X_AMZ_OBJECT_LOCK_LEGAL_HOLD.as_str().to_string(), "ON".to_string());
+
+        assert!(is_object_locked_by_metadata(&user_defined, false));
+        assert!(!is_object_locked_by_metadata(&user_defined, true));
+    }
+}