Link Previews

[fm3]

URL of deployed dev instance (used for testing):

• https://reacthelmet.webknossos.xyz

Steps to test:

• Copy links to annotations and datasets to slack
• If public or with sharing token, it should show name and sensible text and thumbnail preview
• Should also work for shortlinks
• Should not show relevant information in case of non-public datasets (if no sharing token is supplied)

TODOs:

• Use tokens for permission checks (this should only work on public datasets/annotations or when a token is supplied)
  • ctx for annotations+datasets
  • default depending on page type
  • include thumbnail with token (not only for public)
  • resolve short links
  • Access Check for workflows?
  • test that
• Remove react-based attempts (would have been the nicer code, but sadly the remote sites don’t execute any javascript)

Issues:

• fixes Add link previews containing more information (dataset/annotation name/page title) #7061

---

• Updated changelog
• Removed dev-only changes like prints and application.conf edits

[normanrz]

the size could live in a constant somewhere

[normanrz]

would it be a lot of effort to rename oxalis --> webknossos?

[fm3]

Nope, I’ll do that in a separate PR. Truth be told, the package structure doesn’t make that much sense even with the renaming, but it would certainly be an easy improvement