Previously, anyone (even across federation) could invite you to a
room and the bot would join. It may not have provided a useful purpose,
but it still joined all rooms it was invited to.
We now only join rooms when we're invited by a person who is actually
allowed to use the bot.
Fixes https://gitlab.com/etke.cc/postmoogle/-/issues/17
Fixes:
> `mailbox` of this room set to `test@domain@domain`
Previously fixed in 97a4d6c7bc, but it seems like we unintentionally
reintroduced this bug again at some point after that.
When someone first joins a room, they see some commands (`mailbox`,
`owner`, ..) and they know they are getters and setters, but they have
no good example as to how to use them.
Is it `!pm mailbox SOMETHING` or `!pm mailbox=SOMETHING` or something
else?
It's better if the introduction text gives you the full command you need
to get started (e.g. `!pm mailbox SOME_MAILBOX`), instead of a partial
command that you don't know how to use (e.g. `!pm mailbox` - this is
merely a getter and will not set your mailbox to `SOME_MAILBOX`).
Starting from this, I thought it would be a good idea to make all
option getters tell you how the commands are to be used. If you send
`!pm mailbox` and it tells you "not yet set", it should also tell you
how to actually set it (e.g. `!pm mailbox VALUE`).
If're an admin and mess up the `users` list, you won't see "owner"
commands.
If you're just a regular room user (not an admin, not an owner), you'll
only see the `help` command in the `help` message.
Both of these situations may make you wonder:
- is that all there is?
- earlier I saw more commands, so what's going on?
Adding "and accessible to you" hopefully clears things up, or at least
it tries to make the help message more correct.
