Properly handle LFS Batch API response in project importsh-fix-lfs-download-errors

Project imports were failing with `undefined method each_with_object for
String` because the import was attempting to parse the LFS Batch API and
failing due to the fact that the Content-Type wasn't a supported format
(e.g. application/vnd.git-lfs+json instead of application/json). We now
parse the body as JSON.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/61624

1 files changed, 11 insertions, 1 deletions

diff --git a/app/services/projects/lfs_pointers/lfs_download_link_list_service.rb b/app/services/projects/lfs_pointers/lfs_download_link_list_service.rb
index 05974948505..9b72480d18b 100644
--- a/app/services/projects/lfs_pointers/lfs_download_link_list_service.rb
+++ b/app/services/projects/lfs_pointers/lfs_download_link_list_service.rb
@@ -37,7 +37,17 @@ module Projects
 
         raise DownloadLinksError, response.message unless response.success?
 
-        parse_response_links(response['objects'])
+        # Since the LFS Batch API may return a Content-Ttpe of
+        # application/vnd.git-lfs+json
+        # (https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md#requests),
+        # HTTParty does not know this is actually JSON.
+        data = JSON.parse(response.body)
+
+        raise DownloadLinksError, "LFS Batch API did return any objects" unless data.is_a?(Hash) && data.key?('objects')
+
+        parse_response_links(data['objects'])
+      rescue JSON::ParserError
+        raise DownloadLinksError, "LFS Batch API response is not JSON"
       end
 
       def parse_response_links(objects_response)