✨ feat: Implement VRChat protocol handling for macOS

electron-builder.yml

@@ -14,3 +14,6 @@ win:
 mac:
   target: [dmg]
   category: public.app-category.social-networking
+  protocols:
+    - name: VRChat
+      schemes: [vrchat]

package.json

@@ -18,6 +18,7 @@
     "format": "prettier --check .",
     "format:fix": "prettier --write .",
     "package": "pnpm run build && electron-builder --dir",
+    "package:run": "pnpm run package && open dist/mac*/'VRC Circle.app'",
     "dist": "pnpm run build && electron-builder"
   },
   "dependencies": {

src/main/enhancements/service.ts

@@ -41,6 +41,16 @@ function screenshotState(): EnhancementState {
 
 function protocolState(): EnhancementState {
   const s = protocol.status();
+  // isDefaultProtocolClient stays true after disabling on macOS/Windows; trust the pref instead
+  if (platform() !== "linux") {
+    const pref = readPrefs()["vrchat-protocol-handler"];
+    const enabled = pref ?? s.registered;
+    return {
+      id: "vrchat-protocol-handler",
+      enabled,
+      detail: { key: enabled ? "registered" : "notRegistered" },
+    };
+  }
   return { id: "vrchat-protocol-handler", enabled: s.registered, detail: s.detail };
 }
 
@@ -48,6 +58,10 @@ export function snapshot(): EnhancementsSnapshot {
   return { platform: platform(), states: [screenshotState(), protocolState()] };
 }
 
+export function isEnabled(id: EnhancementId): boolean {
+  return readPrefs()[id] ?? false;
+}
+
 export async function setEnabled(
   id: EnhancementId,
   enabled: boolean,

src/main/enhancements/vrchatProtocol.ts

@@ -5,11 +5,15 @@ import { exec } from "node:child_process";
 import { promisify } from "node:util";
 import { existsSync, mkdirSync, rmSync } from "node:fs";
 import { writeFileAtomicSync } from "../lib/atomicFile";
+import { logger } from "../debug/logger";
 import type { EnhancementDetail } from "../../shared/types/enhancements";
 
 const sh = promisify(exec);
 const SCHEME = "vrchat";
 
+// macOS keys the scheme off the bundled Info.plist, so dev has nothing to register or remove
+const isMacDev = process.platform === "darwin" && process.defaultApp;
+
 const DESKTOP_DIR = join(homedir(), ".local", "share", "applications");
 const DESKTOP_FILE = join(DESKTOP_DIR, "vrc-circle-vrchat-url.desktop");
 const DESKTOP_NAME = "vrc-circle-vrchat-url.desktop";
@@ -27,6 +31,7 @@ function execPath(): string {
 }
 
 export function status(): ProtocolStatus {
+  if (isMacDev) return { registered: false, detail: { key: "notRegistered" } };
   if (process.platform !== "linux") {
     const registered = app.isDefaultProtocolClient(SCHEME);
     return {
@@ -41,8 +46,20 @@ export function status(): ProtocolStatus {
 }
 
 export async function enable(): Promise<ProtocolStatus> {
+  if (isMacDev) {
+    logger.info(
+      "enhancements",
+      "vrchat protocol registration skipped; macOS dev needs a packaged build",
+    );
+    return status();
+  }
   if (process.platform !== "linux") {
+    // in dev the bare electron binary has no project context, so pass the entry script
+    if (process.defaultApp && process.argv[1]) {
+      app.setAsDefaultProtocolClient(SCHEME, process.execPath, [resolve(process.argv[1])]);
+    } else {
       app.setAsDefaultProtocolClient(SCHEME);
+    }
     return status();
   }
 
@@ -65,8 +82,19 @@ export async function enable(): Promise<ProtocolStatus> {
 }
 
 export async function disable(): Promise<ProtocolStatus> {
+  if (isMacDev) {
+    logger.info(
+      "enhancements",
+      "vrchat protocol removal skipped; macOS dev has nothing registered",
+    );
+    return status();
+  }
   if (process.platform !== "linux") {
+    if (process.defaultApp && process.argv[1]) {
+      app.removeAsDefaultProtocolClient(SCHEME, process.execPath, [resolve(process.argv[1])]);
+    } else {
       app.removeAsDefaultProtocolClient(SCHEME);
+    }
     return status();
   }
   rmSync(DESKTOP_FILE, { force: true });

src/main/game/launch.ts

@@ -56,7 +56,6 @@ export async function joinInstance(url: string): Promise<JoinResult> {
   const running = await isRunning();
 
   if (process.platform === "darwin") {
-    // TODO: no VRChat on macOS; show the instance in an in-app page instead
     return { launched: false, alreadyRunning: false, unsupported: true };
   }
 

src/main/index.ts

@@ -1,10 +1,11 @@
 import { app, BrowserWindow } from "electron";
 import { join } from "node:path";
 import { registerIpcHandlers } from "./ipc/handlers";
-import { reconcile as reconcileEnhancements } from "./enhancements/service";
+import { reconcile as reconcileEnhancements, isEnabled } from "./enhancements/service";
 import { registerGalleryScheme, registerGalleryProtocol } from "./gallery/protocol";
 import { startSocialBridge } from "./store/social";
 import { startWatcher as startGameWatcher, joinInstance } from "./game/launch";
+import { parseLocation } from "../shared/types/user";
 import { startRegionDetection } from "./game/region";
 import { startGalleryWatch, stopGalleryWatch } from "./gallery/watcher";
 import { startDebugBridge } from "./debug/bridge";
@@ -13,12 +14,43 @@ import { userCache } from "./vrchat/userService";
 import { repos } from "./store/repository/manager";
 import { activeId } from "./accounts/store";
 import { closeClients } from "./vrchat/client";
-import { createMainWindow, focusMainWindow } from "./windows";
+import { createMainWindow, focusMainWindow, broadcast } from "./windows";
+
+function locationFromVrchatUrl(url: string): string | undefined {
+  try {
+    return new URL(url).searchParams.get("id") ?? undefined;
+  } catch {
+    return undefined;
+  }
+}
+
+function handleVrchatUrl(url: string | undefined): boolean {
+  if (!url || !url.startsWith("vrchat://")) return false;
+
+  if (!isEnabled("vrchat-protocol-handler")) {
+    logger.info("game", "ignoring vrchat:// url; handler disabled", { url });
+    return false;
+  }
 
-function handleVrchatUrl(url: string | undefined): void {
-  if (!url || !url.startsWith("vrchat://")) return;
   logger.info("game", "received vrchat:// url", { url });
+
+  if (process.platform === "darwin") {
+    const location = locationFromVrchatUrl(url);
+    const parsed = parseLocation(location);
+    if (!parsed) {
+      logger.warn("game", "could not parse instance location from vrchat:// url", { url });
+      return false;
+    }
+    broadcast("instance:open", {
+      worldId: parsed.worldId,
+      instanceId: parsed.instance,
+      location: location!,
+    });
+    return true;
+  }
+
   joinInstance(url).catch((err) => logger.warn("game", "join from protocol url failed", err));
+  return true;
 }
 
 function vrchatUrlFromArgv(argv: string[]): string | undefined {
@@ -30,13 +62,13 @@ if (!app.requestSingleInstanceLock()) {
 } else {
   // already-running case (win32/linux): the new instance's argv carries the url
   app.on("second-instance", (_e, argv) => {
-    focusMainWindow();
+    const url = vrchatUrlFromArgv(argv);
-    handleVrchatUrl(vrchatUrlFromArgv(argv));
+    // a disabled protocol link must not steal focus; a plain re-launch still should
+    if (url ? handleVrchatUrl(url) : true) focusMainWindow();
   });
   // macOS delivers protocol urls here, both cold and warm
   app.on("open-url", (_e, url) => {
-    focusMainWindow();
+    if (handleVrchatUrl(url)) focusMainWindow();
-    handleVrchatUrl(url);
   });
   registerGalleryScheme();
   start();

src/main/store/social.ts

@@ -127,10 +127,10 @@ function subscribe(vrc: VRChat & Pipeline): void {
     if (p) entityStore.upsert(state ? { ...p, state } : p);
   };
 
-  vrc.on("friend-update", (d) => patch(d, undefined, true));
+  vrc.on("friend-update", (d: unknown) => patch(d, undefined, true));
-  vrc.on("user-update", (d) => patch(d, undefined, true));
+  vrc.on("user-update", (d: unknown) => patch(d, undefined, true));
-  vrc.on("friend-online", (d) => patch(d, "online"));
+  vrc.on("friend-online", (d: unknown) => patch(d, "online"));
-  vrc.on("friend-active", (d) => patch(d, "active"));
+  vrc.on("friend-active", (d: unknown) => patch(d, "active"));
 
   const location = (data: unknown) => {
     if (!active()) return;
@@ -143,13 +143,13 @@ function subscribe(vrc: VRChat & Pipeline): void {
   vrc.on("friend-location", location);
   vrc.on("user-location", location);
 
-  vrc.on("friend-offline", (data) => {
+  vrc.on("friend-offline", (data: unknown) => {
     if (!active()) return;
     const id = (asRecord(data).userId ?? userOf(data).id) as string | undefined;
     if (id) entityStore.upsert({ id, state: "offline", location: "offline" });
   });
 
-  vrc.on("friend-add", async (data) => {
+  vrc.on("friend-add", async (data: unknown) => {
     if (!active()) return;
     const id = (asRecord(data).userId ?? userOf(data).id) as string | undefined;
     if (!id) return;
@@ -158,7 +158,7 @@ function subscribe(vrc: VRChat & Pipeline): void {
     } catch {}
   });
 
-  vrc.on("friend-delete", (data) => {
+  vrc.on("friend-delete", (data: unknown) => {
     if (!active()) return;
     const id = (asRecord(data).userId ?? userOf(data).id) as string | undefined;
     if (id) entityStore.removeFriend(id);

src/renderer/src/components/AppShell.tsx

@@ -1,4 +1,4 @@
-import { useState } from "react";
+import { useEffect, useState } from "react";
 import {
   ArrowLeft,
   ChevronLeft,
@@ -27,7 +27,7 @@ import { AccountSwitcher } from "../features/auth/AccountSwitcher";
 import { LaunchButton } from "../features/game/LaunchButton";
 import { NavProvider, useNav, type View } from "../features/navigation/NavContext";
 import { useI18n } from "../lib/i18n";
-import { api } from "../lib/api";
+import { api, events } from "../lib/api";
 import "../styles/app-shell.css";
 
 export function AppShell() {
@@ -53,6 +53,14 @@ function Shell() {
   const [leftOpen, setLeftOpen] = useState(true);
   const [friendsOpen, setFriendsOpen] = useState(true);
 
+  useEffect(
+    () =>
+      events.on("instance:open", ({ worldId, instanceId, location }) =>
+        nav.openInstance(worldId, instanceId, location),
+      ),
+    [nav],
+  );
+
   const navItems: NavItem[] = [
     {
       id: "search",

src/renderer/src/features/enhancements/EnhancementsView.tsx

@@ -27,7 +27,7 @@ const CATALOG: Meta[] = [
   {
     id: "vrchat-protocol-handler",
     icon: <Link2 size={18} />,
-    platforms: ["linux", "win32"], // TODO: add darwin with the in-app instance page
+    platforms: ["linux", "win32", "darwin"],
   },
 ];
 

src/renderer/src/features/world/CreateInstanceModal.tsx

@@ -212,10 +212,13 @@ function ResultView({ instance }: { instance: Instance }) {
     }
   };
 
+  const canLaunch = window.api.platform !== "darwin";
+
   return (
     <div className="flex flex-col gap-4">
       <p className="text-text">{t("world:create.ready")}</p>
 
+      {canLaunch ? (
         <div className="flex flex-col gap-1.5">
           <Button variant="primary" onClick={launch} loading={launching} block>
             {!launching ? <Play size={15} /> : null}
@@ -223,6 +226,7 @@ function ResultView({ instance }: { instance: Instance }) {
           </Button>
           {launchError ? <span className="text-[12px] text-danger">{launchError}</span> : null}
         </div>
+      ) : null}
 
       <div className="flex flex-col gap-1.5">
         <Button variant="ghost" onClick={selfInvite} disabled={inviteSent} block>

src/renderer/src/features/world/InstanceView.tsx

@@ -158,6 +158,8 @@ function JoinActions({ instance }: { instance: Instance }) {
     }
   };
 
+  const canLaunch = window.api.platform !== "darwin";
+
   return (
     <div className="mb-1 ml-auto flex shrink-0 flex-col items-end gap-1.5">
       <div className="flex gap-1.5">
@@ -165,10 +167,12 @@ function JoinActions({ instance }: { instance: Instance }) {
           {inviteSent ? <Check size={15} /> : <Send size={15} />}
           {inviteSent ? t("world:instance.inviteSent") : t("world:instance.inviteMe")}
         </Button>
+        {canLaunch ? (
           <Button variant="primary" onClick={join} loading={joining}>
             {!joining ? <Play size={15} /> : null}
             {joining ? t("world:instance.joining") : t("world:instance.join")}
           </Button>
+        ) : null}
       </div>
       {joinError ? <span className="text-[12px] text-danger">{joinError}</span> : null}
       {inviteError ? <span className="text-[12px] text-danger">{inviteError}</span> : null}

src/shared/ipc.ts

@@ -143,6 +143,7 @@ export interface IpcEvents {
   "group:upsert": Group;
   "world:favoriteFolders": { userId: string; folders: FavoriteWorldFolder[]; done: boolean };
   "game:changed": GameStatus;
+  "instance:open": { worldId: string; instanceId: string; location: string };
   "gallery:added": Photo;
   "debug:log": LogEntry;
   "debug:cache": CacheUpdate;