Disable pdf viewer on files that have download disabled

[juliushaertl]

We should not attempt to open the pdf viewer for files that have download disabled as it fails to download the file from webdav

Ref nextcloud/server#32482 (comment)

[juliushaertl]

Related to the discussion we had @Raudius about making Collabora the default viewer in this case.

[elhananjair]

Related to the discussion we had @Raudius about making Collabora the default viewer in this case.

Oh I wish if that's possible, specially for PDF files

[juliushaertl]

• Block opening pdf files with the disabled download permission
• Using collabora as a default just in this case is hard, as the viewer doesn't have proper logic for checking the file with custom callbacks at opening
  • We go for just registering Collabora as default for pdf if files_pdfviewer is disabled

[allexzander]

There is also an inconsistency in how "Allow download/Hide download" works with internal vs email shares. For email shares, there is a "Hide download" checkbox, which, while checked, allows the share-receiving user to view the PDF file without allowing to download it. The PDF viewer seems to be different for internal vs email share.

[strangmann]

Is there a workaround instead of using collabora? I will not switch to collabora now. The "Allow download"-function does not work anymore. Is it possible to switch to the "Hide download"-function?