Location-restricted PDFs do not display in the PDF viewer even at an authorized location

[andrewjbtw]

Describe the bug

When at an authorized location, location-restricted PDFs do not open in the viewer. It is possible to download the PDFs from direct links to the Stacks URL but the viewer presentation looks the same as when you are not in an authorized location.

I tested this while on campus visiting the Special Collections reading room. Geoff Willard (@oceanofsound ) also verified this from his workstation that is authorized to view location-restricted materials.

Expected behavior

When at an authorized location, the viewer should present PDFs as if the user has logged in. This is what happens with location-restricted media and images.

Additional information

I'm not sure how we can test this remotely. Whoever picks up the ticket may need to coordinate with Geoff if they need to see what the browser is doing when visiting PDF.

To reproduce

From an authorized location:

1. Visit this purl.
2. See that the PDF is not available
3. Try this Stacks link:
4. See that the PDF can be downloaded, which means the location-restriction is being applied to the file.

From outside an authorized location:

Follow the steps above and see that neither the PDF viewer nor the Stacks link will allow access to the PDF.

[jcoyne]

I believe this is because https://github.com/sul-dlss/sul-embed/blob/main/app/viewers/embed/viewer/pdf_viewer.rb#L37-L39 is returning false

purl_object = Embed::Purl.find('zs884sy8048')
document_resource_files = purl_object.contents.select { |content| content.type == 'document' }.map(&:files).flatten
document_resource_files.first&.downloadable?
# => false

Embed::Purl::ResourceFile#downloadable? requires either world downloadable or stanford only downloadable.

It seems like the PdfComponent is using a completely different auth protocol from the media viewer. Currently it doesn't look like the PDF can handle embargo either. I wonder if switching to the media protocol could fix this?

I thought we did this in #2075.

[dnoneill]

How would I test this without being on campus?

[jcoyne]

@dnoneill could you run a local copy of stacks and set your own IP https://github.com/sul-dlss/stacks/blob/main/config/settings.yml#L58 ?