feat: wip, better digest handling (+ eventual digest resend logic) (#7995)

* feat: wip, better digest handling (+ eventual digest resend logic)

- await emailer.send call in digest.send method
- save send success to a new sorted set digest:{interval}:byUid

* feat: continuing work on digest tools

- Added ACP page to view digest settings and delivery times per user

* feat: added paginator and stub buttons for resending digest

* feat: wrapping up digest revamp

- New language strings in ACP digest page
- Client-side ACP script for digest ACP page
- Websocket call for ACP page to execute digests
- Broke out logic to retrieve user digest settings to getUsersInterval

* fix: minor cleanup

* fix: #8010 and some style suggestions from baris

* fix: resolve confusing comment

src/controllers/admin.js

@@ -9,6 +9,7 @@ var adminController = {
 	postQueue: require('./admin/postqueue'),
 	blacklist: require('./admin/blacklist'),
 	groups: require('./admin/groups'),
+	digest: require('./admin/digest'),
 	appearance: require('./admin/appearance'),
 	extend: {
 		widgets: require('./admin/widgets'),

src/controllers/admin/digest.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const meta = require('../../meta');
+const digest = require('../../user/digest');
+const pagination = require('../../pagination');
+
+const digestController = module.exports;
+
+digestController.get = async function (req, res) {
+	const page = parseInt(req.query.page, 10) || 1;
+	const resultsPerPage = 50;
+	const start = Math.max(0, page - 1) * resultsPerPage;
+	const stop = start + resultsPerPage - 1;
+	const delivery = await digest.getDeliveryTimes(start, stop);
+
+	const pageCount = Math.ceil(delivery.count / resultsPerPage);
+	res.render('admin/manage/digest', {
+		title: '[[admin/menu:manage/digest]]',
+		delivery: delivery.users,
+		default: meta.config.dailyDigestFreq,
+		pagination: pagination.create(page, pageCount),
+	});
+};