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/socket.io/admin.js

@@ -42,6 +42,7 @@ SocketAdmin.analytics = {};
 SocketAdmin.logs = {};
 SocketAdmin.errors = {};
 SocketAdmin.uploads = {};
+SocketAdmin.digest = {};
 
 SocketAdmin.before = async function (socket, method) {
 	const isAdmin = await user.isAdministrator(socket.uid);
@@ -352,4 +353,22 @@ SocketAdmin.uploads.delete = function (socket, pathToFile, callback) {
 	fs.unlink(pathToFile, callback);
 };
 
+SocketAdmin.digest.resend = async (socket, data) => {
+	const uid = data.uid;
+	const interval = data.action.startsWith('resend-') ? data.action.slice(7) : await userDigest.getUsersInterval(uid);
+
+	if (!interval && meta.config.dailyDigestFreq === 'off') {
+		throw new Error('[[error:digest-not-enabled]]');
+	}
+
+	if (uid) {
+		await userDigest.execute({
+			interval: interval || meta.config.dailyDigestFreq,
+			subscribers: [uid],
+		});
+	} else {
+		await userDigest.execute({ interval: interval });
+	}
+};
+
 require('../promisify')(SocketAdmin);