app: Open link for connected organizations in Zulip desktop

Fixes: #1219

Two new IPC messages are introduced to implement this feature:
1. `"update-org-urls": (urls: string[]) => void` in `MainMessage` stores the
   list of urls for connected organizations.
2. `"navigate-to-org-url": (url: string) => void` in `RenderMessage` that opens
   the corresponding tab if the url points to a connected organization. If not,
   this is a no-op. Uses the list of urls from above to determine whether a url
   belongs to a connected organization.

Author: GZGavinZhao

app/common/typed-ipc.ts

@@ -23,6 +23,7 @@ export type MainMessage = {
   "update-badge": (messageCount: number) => void;
   "update-menu": (properties: MenuProperties) => void;
   "update-taskbar-icon": (data: string, text: string) => void;
+  "update-org-urls": (urls: string[]) => void;
 };
 
 export type MainCall = {
@@ -78,6 +79,7 @@ export type RendererMessage = {
   "update-realm-icon": (serverURL: string, iconURL: string) => void;
   "update-realm-name": (serverURL: string, realmName: string) => void;
   "webview-reload": () => void;
+  "navigate-to-org-url": (url: string) => void;
   zoomActualSize: () => void;
   zoomIn: () => void;
   zoomOut: () => void;

app/main/handle-external-link.ts

@@ -13,6 +13,7 @@ import * as ConfigUtil from "../common/config-util.ts";
 import * as LinkUtil from "../common/link-util.ts";
 import * as t from "../common/translation-util.ts";
 
+import {isConfiguredOrgUrl} from "./org-url-cache.ts";
 import {send} from "./typed-ipc-main.ts";
 
 function isUploadsUrl(server: string, url: URL): boolean {
@@ -159,6 +160,9 @@ export default function handleExternalLink(
         }
       },
     });
+  } else if (isConfiguredOrgUrl(url)) {
+    // URL belongs to a configured organization - navigate there in-app
+    send(mainContents, "navigate-to-org-url", url.href);
   } else {
     (async () => LinkUtil.openBrowser(url))();
   }

app/main/index.ts

@@ -27,6 +27,7 @@ import {appUpdater, shouldQuitForUpdate} from "./autoupdater.ts";
 import * as BadgeSettings from "./badge-settings.ts";
 import handleExternalLink from "./handle-external-link.ts";
 import * as AppMenu from "./menu.ts";
+import {updateOrgUrls} from "./org-url-cache.ts";
 import {_getServerSettings, _isOnline, _saveServerIcon} from "./request.ts";
 import {sentryInit} from "./sentry.ts";
 import {setAutoLaunch} from "./startup.ts";
@@ -456,6 +457,10 @@ function createMainWindow(): BrowserWindow {
     ConfigUtil.setConfigItem("lastActiveTab", index);
   });
 
+  ipcMain.on("update-org-urls", (_event, urls: string[]) => {
+    updateOrgUrls(urls);
+  });
+
   ipcMain.on("focus-this-webview", (event) => {
     send(page, "focus-webview-with-id", event.sender.id);
     mainWindow.show();

app/main/org-url-cache.ts

@@ -0,0 +1,12 @@
+// Cache of configured organization origins for cross-org link handling
+// This is updated by the renderer process when orgs change
+
+let cachedOrgOrigins: string[] = [];
+
+export function updateOrgUrls(urls: string[]): void {
+  cachedOrgOrigins = urls.map((url) => new URL(url).origin);
+}
+
+export function isConfiguredOrgUrl(url: URL): boolean {
+  return cachedOrgOrigins.includes(url.origin);
+}

app/renderer/js/main.ts

@@ -328,6 +328,8 @@ export class ServerManagerView {
 
   async initTabs(): Promise<void> {
     const servers = DomainUtil.getDomains();
+    // Sync org URLs to main process for cross-org link handling
+    this.syncOrgUrlsToMain();
     if (servers.length > 0) {
       for (const [i, server] of servers.entries()) {
         const tab = this.initServer(server, i);
@@ -489,6 +491,12 @@ export class ServerManagerView {
     return currentIndex;
   }
 
+  // Sync configured org URLs to main process for cross-org link handling
+  syncOrgUrlsToMain(): void {
+    const urls = DomainUtil.getDomains().map((server) => server.url);
+    ipcRenderer.send("update-org-urls", urls);
+  }
+
   async getCurrentActiveServer(): Promise<string> {
     const tab = this.tabs[this.activeTabIndex];
     return tab instanceof ServerTab ? (await tab.webview).properties.url : "";
@@ -1009,6 +1017,25 @@ export class ServerManagerView {
       await this.activateLastTab(index);
     });
 
+    ipcRenderer.on("navigate-to-org-url", async (event, urlString: string) => {
+      // Handle cross-organization link navigation, no-op if the url doesn't
+      // point to a connected organization.
+      const url = new URL(urlString);
+      const servers = DomainUtil.getDomains();
+      const orgIndex = servers.findIndex(
+        (s) => new URL(s.url).origin === url.origin,
+      );
+
+      if (orgIndex !== -1) {
+        await this.activateTab(orgIndex);
+        const tab = this.tabs[orgIndex];
+        if (tab instanceof ServerTab) {
+          const webview = await tab.webview;
+          await webview.getWebContents().loadURL(urlString);
+        }
+      }
+    });
+
     ipcRenderer.on("open-org-tab", async () => {
       await this.openSettings("AddServer");
     });