This is a preparatory commit for using isort for sorting all of our
imports, merging changes to files where we can easily review the
changes as something we're happy with.
These are also files with relatively little active development, which
means we don't expect much merge conflict risk from these changes.
This commit adds the following:
1. A reaction model that consists of a user, a message and an emoji that
are unique together (a user cannot react to a particular message more
than once with the same emoji)
2. A reaction event that looks like:
{
'type': 'reaction',
'op': 'add',
'message_id': 3,
'emoji_name': 'doge',
'user': {
'user_id': 1,
'email': 'hamlet@zulip.com',
'full_name': 'King Hamlet'
}
}
3. A new API endpoint, /reactions, that accepts POST requests to add a
reaction to a message
4. A migration to add the new model to the database
5. Tests that check that
(a) Invalid requests cannot be made
(b) The reaction event body contains all the info
(c) The reaction event is sent to the appropriate users
(d) Reacting more than once fails
It is still missing important features like removing emoji and
fetching them alongside messages.