Helen/pdf to html

[lihelennn]

### NOTE: FIRST MERGE haystack/nbclient#14 in order to use query parameters in the URLs if the base URL does not work.

Workflow:

• User uploads a PDF onto nb. We host that file under the uploads/ folder
• We save the link to the req.headers.origin + nb_viewer.html/?id=<UPLOAD_FILE_ID> as the url to the PDF file
• Whenever that link is opened, the PDF.js viewer loads the PDF and also loads NB

[JumanaFM]

Can you please .ignore the client?
Also, do we need to add the whole pdf.js package? It's 300+ files.

[karger]

If you are going to add the whole pdf.js package, think about the fact that we will probably want to upgrade it periodically.  I'm not sure what recommended best practices are, but in nbv1 we tended to put these packages in a directory with version number so we would know what version we were using.

…

On 3/23/2021 8:46 PM, Jumana Almahmoud wrote: ***@***.**** requested changes on this pull request. Can you please .ignore the client? Also, do we need to add the whole pdf.js package? It's 300+ files. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#124 (review)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAIWSXQYTBSTBL4RF3W4WZDTFEY6FANCNFSM4ZV2HRDQ>.

[lihelennn]

Instead of using the files, I used CDNs that host the PDF.js files (version 2.6.347).

PDF.js library: https://mozilla.github.io/pdf.js/getting_started/

CDN for viewers: https://cdnjs.com/libraries/pdf.js
CDN for CMAPs directory: https://unpkg.com/pdfjs-dist/