invites: allow notification by discord/telegram/matrix

also added migration as this required changing the indexing of notify
preferences from email addresses to Jellyfin IDs.

migrations.go

@@ -13,6 +13,7 @@ func runMigrations(app *appContext) {
 	migrateProfiles(app)
 	migrateBootstrap(app)
 	migrateEmailStorage(app)
+	migrateNotificationMethods(app)
 	// migrateHyphens(app)
 }
 
@@ -123,6 +124,40 @@ func migrateEmailStorage(app *appContext) error {
 	return nil
 }
 
+// Pre-0.3.10, Admin notifications for invites were indexed by and only sent to email addresses. Now, when Jellyfin Login is enabled, They are indexed by the admin's Jellyfin ID, and send by any method enabled for them. This migrates storage to that format.
+func migrateNotificationMethods(app *appContext) error {
+	if !app.config.Section("ui").Key("jellyfin_login").MustBool(false) {
+		return nil
+	}
+	changes := false
+	for code, invite := range app.storage.invites {
+		if invite.Notify == nil {
+			continue
+		}
+		for address, notifyPrefs := range invite.Notify {
+			if !strings.Contains(address, "@") {
+				continue
+			}
+			for id, email := range app.storage.emails {
+				if email.Addr == address {
+					invite.Notify[id] = notifyPrefs
+					delete(invite.Notify, address)
+					changes = true
+					break
+				}
+			}
+		}
+		if changes {
+			app.storage.invites[code] = invite
+		}
+	}
+	if changes {
+		app.info.Printf("Migrated to modified invite storage format.")
+		return app.storage.storeInvites()
+	}
+	return nil
+}
+
 // Migrate between hyphenated & non-hyphenated user IDs. Doesn't seem to happen anymore, so disabled.
 // func migrateHyphens(app *appContext) {
 // 	checkVersion := func(version string) int {