Add API for moving files (infiniflow#1016)

### What problem does this PR solve?

Add backend API support for moving files into other directory

### Type of change
- [x] New Feature (non-breaking change which adds functionality)

api/apps/file_app.py

@@ -343,5 +343,27 @@ def get(file_id):
                     'application/%s' %
                     ext.group(1))
         return response
+    except Exception as e:
+        return server_error_response(e)
+
+@manager.route('/mv', methods=['POST'])
+@login_required
+@validate_request("src_file_ids", "dest_file_id")
+def move():
+    req = request.json
+    try:
+        file_ids = req["src_file_ids"]
+        parent_id = req["dest_file_id"]
+        for file_id in file_ids:
+            e, file = FileService.get_by_id(file_id)
+            if not e:
+                return get_data_error_result(retmsg="File or Folder not found!")
+            if not file.tenant_id:
+                return get_data_error_result(retmsg="Tenant not found!")
+        fe, _ = FileService.get_by_id(parent_id)
+        if not fe:
+            return get_data_error_result(retmsg="Parent Folder not found!")
+        FileService.move_file(file_ids, parent_id)
+        return get_json_result(data=True)
     except Exception as e:
         return server_error_response(e)

api/db/services/file_service.py

@@ -304,4 +304,13 @@ def add_file_from_kb(cls, doc, kb_folder_id, tenant_id):
             "source_type": FileSource.KNOWLEDGEBASE
         }
         cls.save(**file)
-        File2DocumentService.save(**{"id": get_uuid(), "file_id": file["id"], "document_id": doc["id"]})
+        File2DocumentService.save(**{"id": get_uuid(), "file_id": file["id"], "document_id": doc["id"]})
+
+    @classmethod
+    @DB.connection_context()
+    def move_file(cls, file_ids, folder_id):
+        try:
+            cls.filter_update((cls.model.id << file_ids, ), { 'parent_id': folder_id })
+        except Exception as e:
+            print(e)
+            raise RuntimeError("Database error (File move)!")