feat(auth,policy): add AWS SigV4 authentication and S3 bucket policy support

rust/src/storage.rs

@@ -118,14 +118,24 @@ impl FileStore {
 
     pub async fn initialize(&self) -> Result<()> {
         fs::create_dir_all(&self.root_dir).await?;
+        fs::create_dir_all(self.policies_dir()).await?;
         Ok(())
     }
 
+    pub fn policies_dir(&self) -> PathBuf {
+        self.root_dir.join(".policies")
+    }
+
+    pub fn policy_path(&self, bucket: &str) -> PathBuf {
+        self.policies_dir().join(format!("{}.policy.json", bucket))
+    }
+
     pub async fn reset(&self) -> Result<()> {
         if self.root_dir.exists() {
             fs::remove_dir_all(&self.root_dir).await?;
         }
         fs::create_dir_all(&self.root_dir).await?;
+        fs::create_dir_all(self.policies_dir()).await?;
         Ok(())
     }