Add announcements (#12662)

* Add announcements

Fix #11006

* Add reactions to announcements

* Add admin UI for announcements

* Add unit tests

* Fix issues

- Add `with_dismissed` param to announcements API
- Fix end date not being formatted when time range is given
- Fix announcement delete causing reactions to send streaming updates
- Fix announcements container growing too wide and mascot too small
- Fix `all_day` being settable when no time range is given
- Change text "Update" to "Announcement"

* Fix scheduler unpublishing announcements before they are due

* Fix filter params not being passed to announcements filter

2 files changed, 74 insertions, 0 deletions

diff --git a/app/javascript/mastodon/reducers/announcements.js b/app/javascript/mastodon/reducers/announcements.js
new file mode 100644
index 000000000..aa674e516
--- /dev/null
+++ b/app/javascript/mastodon/reducers/announcements.js
@@ -0,0 +1,72 @@
+import {
+  ANNOUNCEMENTS_FETCH_REQUEST,
+  ANNOUNCEMENTS_FETCH_SUCCESS,
+  ANNOUNCEMENTS_FETCH_FAIL,
+  ANNOUNCEMENTS_UPDATE,
+  ANNOUNCEMENTS_DISMISS,
+  ANNOUNCEMENTS_REACTION_UPDATE,
+  ANNOUNCEMENTS_REACTION_ADD_REQUEST,
+  ANNOUNCEMENTS_REACTION_ADD_FAIL,
+  ANNOUNCEMENTS_REACTION_REMOVE_REQUEST,
+  ANNOUNCEMENTS_REACTION_REMOVE_FAIL,
+} from '../actions/announcements';
+import { Map as ImmutableMap, List as ImmutableList, fromJS } from 'immutable';
+
+const initialState = ImmutableMap({
+  items: ImmutableList(),
+  isLoading: false,
+});
+
+const updateReaction = (state, id, name, updater) => state.update('items', list => list.map(announcement => {
+  if (announcement.get('id') === id) {
+    return announcement.update('reactions', reactions => {
+      if (reactions.find(reaction => reaction.get('name') === name)) {
+        return reactions.map(reaction => {
+          if (reaction.get('name') === name) {
+            return updater(reaction);
+          }
+
+          return reaction;
+        });
+      }
+
+      return reactions.push(updater(fromJS({ name, count: 0 })));
+    });
+  }
+
+  return announcement;
+}));
+
+const updateReactionCount = (state, reaction) => updateReaction(state, reaction.announcement_id, reaction.name, x => x.set('count', reaction.count));
+
+const addReaction = (state, id, name) => updateReaction(state, id, name, x => x.set('me', true).update('count', y => y + 1));
+
+const removeReaction = (state, id, name) => updateReaction(state, id, name, x => x.set('me', false).update('count', y => y - 1));
+
+export default function announcementsReducer(state = initialState, action) {
+  switch(action.type) {
+  case ANNOUNCEMENTS_FETCH_REQUEST:
+    return state.set('isLoading', true);
+  case ANNOUNCEMENTS_FETCH_SUCCESS:
+    return state.withMutations(map => {
+      map.set('items', fromJS(action.announcements));
+      map.set('isLoading', false);
+    });
+  case ANNOUNCEMENTS_FETCH_FAIL:
+    return state.set('isLoading', false);
+  case ANNOUNCEMENTS_UPDATE:
+    return state.update('items', list => list.unshift(fromJS(action.announcement)).sortBy(announcement => announcement.get('starts_at')));
+  case ANNOUNCEMENTS_DISMISS:
+    return state.update('items', list => list.filterNot(announcement => announcement.get('id') === action.id));
+  case ANNOUNCEMENTS_REACTION_UPDATE:
+    return updateReactionCount(state, action.reaction);
+  case ANNOUNCEMENTS_REACTION_ADD_REQUEST:
+  case ANNOUNCEMENTS_REACTION_REMOVE_FAIL:
+    return addReaction(state, action.id, action.name);
+  case ANNOUNCEMENTS_REACTION_REMOVE_REQUEST:
+  case ANNOUNCEMENTS_REACTION_ADD_FAIL:
+    return removeReaction(state, action.id, action.name);
+  default:
+    return state;
+  }
+};
diff --git a/app/javascript/mastodon/reducers/index.js b/app/javascript/mastodon/reducers/index.js
index b8d608888..b9817cd38 100644
--- a/app/javascript/mastodon/reducers/index.js
+++ b/app/javascript/mastodon/reducers/index.js
@@ -34,8 +34,10 @@ import polls from './polls';
 import identity_proofs from './identity_proofs';
 import trends from './trends';
 import missed_updates from './missed_updates';
+import announcements from './announcements';
 
 const reducers = {
+  announcements,
   dropdown_menu,
   timelines,
   meta,