* Add a way for users to temporarily deactivate their accounts, in a
recoverable way should they decide to return later.
* A deactivated account may log in but have limited options: to
reactivate their account, permanently delete it, or log out.
* Fix several bugs around the display of comments, messages and
forum threads for disabled, banned, or blocked users:
* Messages (inbox and sentbox) will be hidden and the unread indicator
will not count unread messages the user can't access.
* Comments on photos and forum posts are hidden, and top-level threads
on the "Newest" tab will show "[unavailable]" for their text and
username.
* Your historical notifications will hide users who are blocked, banned
or disabled.
* Add a "Friends" tab to user profile pages, to see other users' friends.
* The page is Certification Required so non-cert users can't easily
discover any members on the site.
* Signup: if entering an existing email, don't admit that the email
exists. Instead, send a specialized email to its address.
* Search: no longer search for users by email address.
* Login: always hash the incoming password on user not found, to take
constant time compared to when the user did exist.
* Fix a pagination bug when a private (shy account) views a non-friend's
photo gallery.
* Add photo upload quotas.
* Non-certified users can upload few photos; certified users more
* Fix foreign key issues around deleting user profile photos for psql
* Add impersonate feature
* Add ban/unban user feature
* Add promote/demote admin status feature
* Add admin user deletion feature
* Admin ability to see other status certification pics
* Nav bar indicator of pending admin actions such as cert pics
needing approval
* Admin ability to search cert pics for specific user
* Add "forgot password" workflow.
* Add ability to change user email address (confirmation link sent)
* Add ability to change user's password.
* Add rate limiter to deter brute force login attempts.
* Add user deep delete functionality (delete account).
* Ping user LastLoginAt every 8 hours for long-lived session cookies.
* Add age filters to user search page.
* Add sort options to user search (last login, created, username/name)
