Disallow links without protocol (e.g. starting with http(s)://) in LinkedText. (#32972)

* Disallow links without protocols in LinkedText.

* Update tests

packages/shared-components/src/core/utils/LinkedText/LinkedText.test.tsx

@@ -49,6 +49,15 @@ describe("LinkedText", () => {
         expect(container).toMatchSnapshot();
     });
 
+    it("does not linkify domains without a protocol.", () => {
+        const { queryAllByRole } = render(
+            <LinkedTextContext value={{}}>
+                <LinkedText>Check out this link github.com</LinkedText>
+            </LinkedTextContext>,
+        );
+        expect(queryAllByRole("link")).toHaveLength(0);
+    });
+
     it("renders a user ID", () => {
         const { container } = render(<WithUserId />);
         expect(container).toMatchSnapshot();
@@ -73,7 +82,7 @@ describe("LinkedText", () => {
         const fn = vitest.fn();
         const { getAllByRole } = render(
             <LinkedTextContext value={{}}>
-                <LinkedText onLinkClick={fn}>Check out this link https://google.com and example.org</LinkedText>
+                <LinkedText onLinkClick={fn}>Check out this link https://google.com and https://example.org</LinkedText>
             </LinkedTextContext>,
         );
         const links = getAllByRole("link");

packages/shared-components/src/core/utils/linkify.ts

@@ -228,10 +228,10 @@ export function generateLinkedTextOptions({
             : undefined),
         // By default, ignore Matrix ID types.
         // Other applications may implement their own version of LinkifyComponent.
-        validate: (_value, type: string) =>
+        validate: (value, type: string) =>
             !!(type === LinkifyMatrixOpaqueIdType.UserId && userIdListener) ||
             !!(type === LinkifyMatrixOpaqueIdType.RoomAlias && roomAliasListener) ||
-            type === LinkifyMatrixOpaqueIdType.URL,
+            !!(type === LinkifyMatrixOpaqueIdType.URL && URL.canParse(value)),
     } satisfies linkifyjs.Opts;
 }