Adds message forwarding

ts/state/selectors/linkPreviews.ts

@@ -0,0 +1,21 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { createSelector } from 'reselect';
+
+import { StateType } from '../reducer';
+
+export const getLinkPreview = createSelector(
+  ({ linkPreviews }: StateType) => linkPreviews.linkPreview,
+  linkPreview => {
+    if (linkPreview) {
+      return {
+        ...linkPreview,
+        domain: window.Signal.LinkPreviews.getDomain(linkPreview.url),
+        isLoaded: true,
+      };
+    }
+
+    return undefined;
+  }
+);