refactor: Restructure project layout and clean up dependencies (#30)

This commit introduces a significant reorganization of the project structure to improve maintainability and clarity.

Key changes include:
- Adjusted the directory layout for a more logical module organization.
- Removed unused crate dependencies, reducing the overall project size and potentially speeding up build times.
- Updated import paths and configuration files to reflect the structural changes.

crates/ecstore/src/bucket/policy_sys.rs

@@ -0,0 +1,44 @@
+// 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::{error::BucketMetadataError, metadata_sys::get_bucket_metadata_sys};
+use crate::error::Result;
+use rustfs_policy::policy::{BucketPolicy, BucketPolicyArgs};
+use tracing::warn;
+
+pub struct PolicySys {}
+
+impl PolicySys {
+    pub async fn is_allowed(args: &BucketPolicyArgs<'_>) -> bool {
+        match Self::get(args.bucket).await {
+            Ok(cfg) => return cfg.is_allowed(args),
+            Err(err) => {
+                let berr: BucketMetadataError = err.into();
+                if berr != BucketMetadataError::BucketPolicyNotFound {
+                    warn!("config get err {:?}", berr);
+                }
+            }
+        }
+
+        args.is_owner
+    }
+    pub async fn get(bucket: &str) -> Result<BucketPolicy> {
+        let bucket_meta_sys_lock = get_bucket_metadata_sys()?;
+        let bucket_meta_sys = bucket_meta_sys_lock.read().await;
+
+        let (cfg, _) = bucket_meta_sys.get_bucket_policy(bucket).await?;
+
+        Ok(cfg)
+    }
+}