fix: build desktop session share links on the linked server (#1350)

plugins/session-sharing/tests/frontend/share-link-url.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+import type { TermixApp } from "@termix/plugin-sdk/frontend";
+import {
+  guestViewUrl,
+  sessionPublicUrl,
+} from "../../src/frontend/meeting-backend";
+
+function desktop(url: string | null): TermixApp {
+  return {
+    desktop: { available: true, remoteServerUrl: async () => url },
+  } as unknown as TermixApp;
+}
+
+describe("session share links", () => {
+  it("builds the link on the linked server for a remote session", async () => {
+    const base = await sessionPublicUrl(
+      desktop("https://termix.example/"),
+      "remote",
+    );
+    expect(guestViewUrl(base, "shared", "tok")).toBe(
+      "https://termix.example/?view=shared&token=tok",
+    );
+  });
+
+  it("gives no link for a session on the desktop's own backend", async () => {
+    expect(
+      await sessionPublicUrl(desktop("https://termix.example/"), "local"),
+    ).toBeNull();
+    expect(
+      guestViewUrl("file:///C:/app/index.html", "shared", "tok"),
+    ).toBeNull();
+  });
+
+  it("uses the page address in a browser", async () => {
+    const app = { desktop: { available: false } } as unknown as TermixApp;
+    expect(await sessionPublicUrl(app, undefined)).toBe(window.location.href);
+  });
+});