Sync email settings only when changed

src/app/mail/index.ts

@@ -123,14 +123,22 @@ export class MailNotifications {
   sync() {
     return userSettingsValues.subscribe(
       throttle(500, async ({email, emailAddress, emailFrequency}) => {
-        const current = emailNotificationState.get()
-
         if (email && emailAddress) {
+          const existing = await this._lookup()
+
           if (
-            !current.callback ||
+            existing?.confirmed &&
-            current.email !== emailAddress ||
+            existing.email === emailAddress &&
-            current.frequency !== emailFrequency
+            existing.frequency === emailFrequency
           ) {
+            emailNotificationState.set({
+              key: existing.key,
+              callback: existing.callback,
+              email: existing.email,
+              frequency: existing.frequency,
+              error: undefined,
+            })
+          } else {
             try {
               await this.register(emailAddress, emailFrequency)
             } catch {
@@ -146,6 +154,18 @@ export class MailNotifications {
     )
   }
 
+  async _lookup() {
+    const {pubkey} = User.require(app.get())
+
+    const res = await fetch(
+      `${buildUrl(EMAIL_NOTIFICATION_SERVER, "subscription", "email")}?pubkey=${pubkey}`,
+    )
+
+    if (!res.ok) return undefined
+
+    return res.json()
+  }
+
   _getSubscriptionIdentifier = (relay: string, key: string) =>
     String(hash(relay + key + device.get() + "email"))