backup metadata first step

cps/gdriveutils.py

@@ -578,6 +578,7 @@ def deleteDatabaseEntry(ID):
 
 
 # Gets cover file from gdrive
+# ToDo: Check is this right everyone get read permissions on cover files?
 def get_cover_via_gdrive(cover_path):
     df = getFileFromEbooksFolder(cover_path, 'cover.jpg')
     if df:
@@ -600,6 +601,29 @@ def get_cover_via_gdrive(cover_path):
     else:
         return None
 
+# Gets cover file from gdrive
+def get_metadata_backup_via_gdrive(metadata_path):
+    df = getFileFromEbooksFolder(metadata_path, 'metadata.opf')
+    if df:
+        if not session.query(PermissionAdded).filter(PermissionAdded.gdrive_id == df['id']).first():
+            df.GetPermissions()
+            df.InsertPermission({
+                            'type': 'anyone',
+                            'value': 'anyone',
+                            'role': 'writer',       # ToDo needs write access
+                            'withLink': True})
+            permissionAdded = PermissionAdded()
+            permissionAdded.gdrive_id = df['id']
+            session.add(permissionAdded)
+            try:
+                session.commit()
+            except OperationalError as ex:
+                log.error_or_exception('Database error: {}'.format(ex))
+                session.rollback()
+        return df.metadata.get('webContentLink')
+    else:
+        return None
+
 # Creates chunks for downloading big files
 def partial(total_byte_len, part_size_limit):
     s = []