| 1 | import { useCallback, useRef } from "react"; |
| 2 | import { app } from "./bridge"; |
| 3 | |
| 4 | interface NavigationIntentRegistration { |
| 5 | token: string; |
| 6 | registered: Promise<string>; |
| 7 | } |
| 8 | |
| 9 | let navigationIntentRegistrationTail: Promise<void> = Promise.resolve(); |
| 10 | let navigationIntentCounter = 0; |
| 11 | |
| 12 | function navigationIntentToken(hint: string): string { |
| 13 | const nonce = new Uint32Array(4); |
| 14 | globalThis.crypto.getRandomValues(nonce); |
| 15 | return `nav-${hint}-${(++navigationIntentCounter).toString(36)}-${Array.from(nonce, (value) => value.toString(36)).join("-")}`; |
| 16 | } |
| 17 | |
| 18 | function scheduleNavigationIntent(hint: string): NavigationIntentRegistration { |
| 19 | const token = navigationIntentToken(hint); |
| 20 | const binding = app.RegisterNavigationIntent; |
| 21 | const registered = navigationIntentRegistrationTail.then(async () => { |
| 22 | if (typeof binding !== "function") throw new Error("navigation intent binding is unavailable"); |
| 23 | await binding.call(app, token); |
| 24 | return token; |
| 25 | }); |
| 26 | navigationIntentRegistrationTail = registered.then(() => undefined, () => undefined); |
| 27 | return { token, registered }; |
| 28 | } |
| 29 | |
| 30 | export function publishNavigationIntent(hint = "direct"): Promise<string> { |
| 31 | return scheduleNavigationIntent(hint).registered; |
| 32 | } |
| 33 | |
| 34 | export function useNavigationIntentFence() { |
| 35 | const registrationsRef = useRef(new Map<number, NavigationIntentRegistration>()); |
| 36 | const registerNavigationIntent = useCallback((seq: number) => { |
| 37 | const scheduled = scheduleNavigationIntent(seq.toString(36)); |
| 38 | const registration: NavigationIntentRegistration = { |
| 39 | token: scheduled.token, |
| 40 | registered: scheduled.registered.catch(() => ""), |
| 41 | }; |
| 42 | registrationsRef.current.clear(); |
| 43 | registrationsRef.current.set(seq, registration); |
| 44 | }, []); |
| 45 | const registeredNavigationIntent = useCallback(async (seq: number): Promise<string> => { |
| 46 | const registration = registrationsRef.current.get(seq); |
| 47 | if (!registration) return ""; |
| 48 | const token = await registration.registered; |
| 49 | if (registrationsRef.current.get(seq)?.token !== token) return ""; |
| 50 | return token; |
| 51 | }, []); |
| 52 | return { registerNavigationIntent, registeredNavigationIntent }; |
| 53 | } |
| 54 |