Improve file management (#10577)

### What problem does this PR solve?

Improve file management. #10287.

Passed tests:

1. Create folder `A` and `B`.
2. Upload a file inside `A`, called `file`.
3. Create a KB, called `K`.
3. Link `file` to `K`.
4. Parse `file` inside of `K`. (OK)
5. Move `file` from `A` to `B`.
6. Parse `file` inside of `K`. (OK)
7. Move `file` from `B` to `A`.
8. Parse `file` inside of `K`. (OK)
9. Move entire folder `A` into `B`. (B -> A -> file)
10. Parse `file` inside of `K`. (OK)
11. Delete folder `B`.
12. All clear. (There is no document inside of `K`)

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/utils/minio_conn.py

@@ -17,6 +17,7 @@
 import logging
 import time
 from minio import Minio
+from minio.commonconfig import CopySource
 from minio.error import S3Error
 from io import BytesIO
 from rag import settings
@@ -141,3 +142,36 @@ class RAGFlowMinio:
         except Exception:
             logging.exception(f"Fail to remove bucket {bucket}")
 
+    def copy(self, src_bucket, src_path, dest_bucket, dest_path):
+        try:
+            if not self.conn.bucket_exists(dest_bucket):
+                self.conn.make_bucket(dest_bucket)
+
+            try:
+                self.conn.stat_object(src_bucket, src_path)
+            except Exception as e:
+                logging.exception(f"Source object not found: {src_bucket}/{src_path}, {e}")
+                return False
+
+            self.conn.copy_object(
+                dest_bucket,
+                dest_path,
+                CopySource(src_bucket, src_path),
+            )
+            return True
+
+        except Exception:
+            logging.exception(f"Fail to copy {src_bucket}/{src_path} -> {dest_bucket}/{dest_path}")
+            return False
+
+    def move(self, src_bucket, src_path, dest_bucket, dest_path):
+        try:
+            if self.copy(src_bucket, src_path, dest_bucket, dest_path):
+                self.rm(src_bucket, src_path)
+                return True
+            else:
+                logging.error(f"Copy failed, move aborted: {src_bucket}/{src_path}")
+                return False
+        except Exception:
+            logging.exception(f"Fail to move {src_bucket}/{src_path} -> {dest_bucket}/{dest_path}")
+            return False