allow eggs to have a release date

website/common/script/content/is_released.js

@@ -0,0 +1,30 @@
+import moment from 'moment';
+import filter from 'lodash/filter';
+import { pickBy } from 'lodash';
+import nconf from 'nconf';
+
+const SWITCHOVER_TIME = nconf.get('CONTENT_SWITCHOVER_TIME_OFFSET') || 0;
+
+const releaseDateEndPart = `T${String(SWITCHOVER_TIME).padStart(2, '0')}:00-0000`;
+
+export function buildReleaseDate (year, month, day = 1) {
+  return `${year}-${String(month).padStart(2, '0')}-${String(day).padStart(2, '0')}${releaseDateEndPart}`;
+}
+
+function isReleased (item, fieldName, releaseDateMap, releaseByDefault) {
+  if (releaseDateMap[item[fieldName]]) {
+    const release = releaseDateMap[item[fieldName]];
+    if (release.day) {
+      return moment().isAfter(moment(buildReleaseDate(release.year, release.month, release.day)));
+    }
+    return moment().isAfter(releaseDateMap[item[fieldName]]);
+  }
+  return releaseByDefault;
+}
+
+export function filterReleased (items, fieldName, releaseDateMap, releaseByDefault = true) {
+  if (typeof items === 'object') {
+    return pickBy(items, item => isReleased(item, fieldName, releaseDateMap, releaseByDefault));
+  }
+  return filter(items, item => isReleased(item, fieldName, releaseDateMap, releaseByDefault));
+}