External PDFs are not displayed

[CamiAndrei]

Steps to reproduce:

• Add a PDF macro in a page
  *Add an absolute URL from an external source in the File field
  "Name of the PDF file or absolute URL to the PDF file"
  
  e.g.: https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf
• Submit the macro
  Results:
  The following error is displayed
  

Note that it works for internal absolute URLs, including from subwikis.

It seems that the pdf.js doesn't allow foreign origin URLs only for hosted viewers : mozilla/pdf.js#7153 and mozilla/pdf.js#6916

[lucaa]

Note that it works for internal absolute URLs, including from subwikis.

When you say "internal absolute URL" you mean an URL that has the same domain as the page where the pdf viewer is used, but it's passed as an absolute URL (starting with https://... ) instead of being passed as relative to the domain (starting with a /...) , right?

[CamiAndrei]

No. I mean the content is external, from a different domain.

[acotiuga]

This fix is not enough as it is in order to display PDF's from different origins. It only provides a mechanism to define some trusted origin to bypass the pdfjs check that throws origin error.
In addition, each XWiki instance owner is responsible to configure the CORS mechanism.

[acotiuga]