Restrict contact editing on the frontend
Closes #345 (closed)
This MR restricts the options of users to edit contact data. It is now only allowed to:
- edit your own data
- edit those that you created
- or you are a super user
Same applies to deleting, but you are not allowed to delete your own contact.
It is also no longer possible to open the contacts page without being logged in.
Edited by Nils Brinckmann