Add account to antenna webui

app/javascript/mastodon/reducers/antennas.js

@@ -0,0 +1,25 @@
+import {
+  ANTENNAS_FETCH_SUCCESS,
+} from '../actions/antennas';
+import { Map as ImmutableMap, fromJS } from 'immutable';
+
+const initialState = ImmutableMap();
+
+const normalizeAntenna = (state, antenna) => state.set(antenna.id, fromJS(antenna));
+
+const normalizeAntennas = (state, antennas) => {
+  antennas.forEach(antenna => {
+    state = normalizeAntenna(state, antenna);
+  });
+
+  return state;
+};
+
+export default function antennas(state = initialState, action) {
+  switch(action.type) {
+  case ANTENNAS_FETCH_SUCCESS:
+    return normalizeAntennas(state, action.antennas);
+  default:
+    return state;
+  }
+}