| 1 | // Web Push helpers, driven by the chat page's onboarding flow (see shell.js). |
| 2 | |
| 3 | export function idbSet(key, value) { |
| 4 | return new Promise((resolve, reject) => { |
| 5 | const req = indexedDB.open("lchat", 1); |
| 6 | req.onupgradeneeded = () => req.result.createObjectStore("kv"); |
| 7 | req.onsuccess = () => { |
| 8 | const db = req.result; |
| 9 | // Close as soon as the write lands, and yield to a schema upgrade from |
| 10 | // elsewhere: a connection held open with no versionchange handler would |
| 11 | // block any future version bump in another tab forever (its open would |
| 12 | // stall pre-paint). Pinned at v1 today, so this is armour, not a fix. |
| 13 | db.onversionchange = () => db.close(); |
| 14 | const tx = db.transaction("kv", "readwrite"); |
| 15 | tx.objectStore("kv").put(value, key); |
| 16 | tx.oncomplete = () => { |
| 17 | db.close(); |
| 18 | resolve(); |
| 19 | }; |
| 20 | tx.onerror = () => { |
| 21 | db.close(); |
| 22 | reject(tx.error); |
| 23 | }; |
| 24 | }; |
| 25 | req.onerror = () => reject(req.error); |
| 26 | req.onblocked = () => reject(new Error("blocked")); |
| 27 | }); |
| 28 | } |
| 29 | |
| 30 | function urlB64ToUint8Array(b64) { |
| 31 | const pad = "=".repeat((4 - (b64.length % 4)) % 4); |
| 32 | const base64 = (b64 + pad).replace(/-/g, "+").replace(/_/g, "/"); |
| 33 | const raw = atob(base64); |
| 34 | const out = new Uint8Array(raw.length); |
| 35 | for (let i = 0; i < raw.length; i++) out[i] = raw.charCodeAt(i); |
| 36 | return out; |
| 37 | } |
| 38 | |
| 39 | const isiOS = /iphone|ipad|ipod/i.test(navigator.userAgent); |
| 40 | const isStandalone = |
| 41 | window.matchMedia("(display-mode: standalone)").matches || |
| 42 | window.navigator.standalone === true; |
| 43 | |
| 44 | // iOS Safari can't do web push until the app is added to the Home Screen. |
| 45 | export function needsHomeScreen() { |
| 46 | return isiOS && !isStandalone; |
| 47 | } |
| 48 | |
| 49 | export function pushSupported() { |
| 50 | return "serviceWorker" in navigator && "PushManager" in window && "Notification" in window; |
| 51 | } |
| 52 | |
| 53 | // Push is usable here and now (not "iOS, but needs install first"). |
| 54 | export function pushAvailable() { |
| 55 | return pushSupported() && !needsHomeScreen(); |
| 56 | } |
| 57 | |
| 58 | export function pushEnabled() { |
| 59 | return pushSupported() && Notification.permission === "granted"; |
| 60 | } |
| 61 | |
| 62 | export function pushDenied() { |
| 63 | return "Notification" in window && Notification.permission === "denied"; |
| 64 | } |
| 65 | |
| 66 | let swReg = null; |
| 67 | |
| 68 | // Register the service worker. The per-thread keys it needs to decrypt push |
| 69 | // payloads are written to IndexedDB separately by shell.js (idbSet "threadKeys"). |
| 70 | // Best-effort; keeps any existing subscription in sync. |
| 71 | export async function registerSW(session) { |
| 72 | if (!("serviceWorker" in navigator)) return; |
| 73 | try { |
| 74 | swReg = await navigator.serviceWorker.register("/sw.js"); |
| 75 | } catch (e) { |
| 76 | console.warn("service worker registration failed", e); |
| 77 | return; |
| 78 | } |
| 79 | if (pushEnabled()) { |
| 80 | // Re-validate the subscription against the current VAPID key (it changes if |
| 81 | // the server DB was reset) and recreate it if stale — self-heals on load. |
| 82 | await subscribePush(session); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | // Request permission (if needed) and subscribe. Returns "on" | "denied" | "error". |
| 87 | export async function subscribePush(session) { |
| 88 | if (!pushAvailable()) return "error"; |
| 89 | if (Notification.permission === "default") { |
| 90 | let perm; |
| 91 | try { |
| 92 | perm = await Notification.requestPermission(); |
| 93 | } catch { |
| 94 | return "error"; |
| 95 | } |
| 96 | if (perm !== "granted") return "denied"; |
| 97 | } |
| 98 | if (Notification.permission !== "granted") return "denied"; |
| 99 | try { |
| 100 | // Ensure the worker is registered AND active before subscribing. Right after |
| 101 | // first registration the worker is still "installing"; subscribing then fails |
| 102 | // silently on iOS — permission reads "granted" but no subscription ever |
| 103 | // reaches the server, so notifications look allowed yet stay off until a |
| 104 | // later menu toggle. serviceWorker.ready resolves only once a worker is active. |
| 105 | await navigator.serviceWorker.register("/sw.js").catch(() => {}); |
| 106 | const reg = await navigator.serviceWorker.ready; |
| 107 | swReg = reg; |
| 108 | const { publicKey } = await (await fetch("/api/push/vapid")).json(); |
| 109 | const appKey = urlB64ToUint8Array(publicKey); |
| 110 | let sub = await reg.pushManager.getSubscription(); |
| 111 | // If an existing subscription was made with a different (old) VAPID key, the |
| 112 | // push service will reject sends — recreate it against the current key. |
| 113 | if (sub && !sameAppServerKey(sub, appKey)) { |
| 114 | try { |
| 115 | await sub.unsubscribe(); |
| 116 | } catch {} |
| 117 | sub = null; |
| 118 | } |
| 119 | if (!sub) { |
| 120 | sub = await reg.pushManager.subscribe({ |
| 121 | userVisibleOnly: true, |
| 122 | applicationServerKey: appKey, |
| 123 | }); |
| 124 | } |
| 125 | await sendSubscription(session.token, sub); |
| 126 | return "on"; |
| 127 | } catch (e) { |
| 128 | console.warn("push subscribe failed", e); |
| 129 | return "error"; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | function sameAppServerKey(sub, appKey) { |
| 134 | try { |
| 135 | const cur = sub.options && sub.options.applicationServerKey; |
| 136 | if (!cur) return false; |
| 137 | const a = new Uint8Array(cur); |
| 138 | if (a.length !== appKey.length) return false; |
| 139 | for (let i = 0; i < a.length; i++) { |
| 140 | if (a[i] !== appKey[i]) return false; |
| 141 | } |
| 142 | return true; |
| 143 | } catch { |
| 144 | return false; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | export async function isSubscribed() { |
| 149 | if (!("serviceWorker" in navigator)) return false; |
| 150 | try { |
| 151 | const reg = swReg || (await navigator.serviceWorker.getRegistration()); |
| 152 | if (!reg) return false; |
| 153 | return !!(await reg.pushManager.getSubscription()); |
| 154 | } catch { |
| 155 | return false; |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | // Turn push off: remove the subscription from the server, then the browser. |
| 160 | export async function unsubscribePush() { |
| 161 | try { |
| 162 | const reg = swReg || (await navigator.serviceWorker.getRegistration()); |
| 163 | if (!reg) return; |
| 164 | const sub = await reg.pushManager.getSubscription(); |
| 165 | if (!sub) return; |
| 166 | await fetch("/api/push/unsubscribe", { |
| 167 | method: "POST", |
| 168 | headers: { "Content-Type": "application/json" }, |
| 169 | body: JSON.stringify({ token: session.token, endpoint: sub.endpoint }), |
| 170 | }); |
| 171 | await sub.unsubscribe(); |
| 172 | } catch (e) { |
| 173 | console.warn("unsubscribe failed", e); |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | function sendSubscription(token, sub) { |
| 178 | return fetch("/api/push/subscribe", { |
| 179 | method: "POST", |
| 180 | headers: { "Content-Type": "application/json" }, |
| 181 | body: JSON.stringify({ token, subscription: sub }), |
| 182 | }); |
| 183 | } |
| 184 | |
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