Support for creating New Groups

ts/groups/limits.ts

@@ -0,0 +1,29 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { isNumber } from 'lodash';
+import { parseIntOrThrow } from '../util/parseIntOrThrow';
+import { getValue, ConfigKeyType } from '../RemoteConfig';
+
+function makeGetter(configKey: ConfigKeyType): (fallback?: number) => number {
+  return fallback => {
+    try {
+      return parseIntOrThrow(
+        getValue(configKey),
+        'Failed to parse group size limit'
+      );
+    } catch (err) {
+      if (isNumber(fallback)) {
+        return fallback;
+      }
+      throw err;
+    }
+  };
+}
+
+export const getGroupSizeRecommendedLimit = makeGetter(
+  'global.groupsv2.maxGroupSize'
+);
+export const getGroupSizeHardLimit = makeGetter(
+  'global.groupsv2.groupSizeHardLimit'
+);