refactor: flag sanity checks, +feat: flag limits

- Added new config flag:limitPerTarget, to disallow flags after an item has
  already been flagged x times (default 0, or infinite)
- New zset flags:byTarget, score is the number of times a flag has been made
  against that item
- "already-flagged" translation key removed, now "post-already-flagged" or
  "user-already-flagged" -- this fixed bug where flagging a user you've already
  flagged would tell you you've already flagged this post already.
- Refactored Flags.canFlag to throw errors only, instead of returning boolean
- Updated ACP form inputs for reputation settings page to be more bootstrappy
- +1 upgrade script

install/data/defaults.json

@@ -79,6 +79,7 @@
     "min:rep:website": 0,
     "min:rep:aboutme": 0,
     "min:rep:signature": 0,
+    "flags:limitPerTarget": 0,
     "notificationType_upvote": "notification",
     "notificationType_new-topic": "notification",
     "notificationType_new-reply": "notification",

public/language/en-GB/admin/menu.json

@@ -19,7 +19,7 @@
 	"settings/general": "General",
 	"settings/homepage": "Home Page",
 	"settings/navigation": "Navigation",
-	"settings/reputation": "Reputation",
+	"settings/reputation": "Reputation & Flags",
 	"settings/email": "Email",
 	"settings/user": "Users",
 	"settings/group": "Groups",

public/language/en-GB/admin/settings/reputation.json

@@ -12,5 +12,9 @@
 	"min-rep-aboutme": "Minimum reputation to add \"About me\" to user profile",
 	"min-rep-signature": "Minimum reputation to add \"Signature\" to user profile",
 	"min-rep-profile-picture": "Minimum reputation to add \"Profile Picture\" to user profile",
-	"min-rep-cover-picture": "Minimum reputation to add \"Cover Picture\" to user profile"
+	"min-rep-cover-picture": "Minimum reputation to add \"Cover Picture\" to user profile",
+
+	"flags": "Flag Settings",
+	"flags.limit-per-target": "Maximum number of times something can be flagged",
+	"flags.limit-per-target-placeholder": "Default: 0"
 }

public/language/en-GB/error.json

@@ -163,7 +163,10 @@
 	"not-enough-reputation-min-rep-signature": "You do not have enough reputation to add a signature",
 	"not-enough-reputation-min-rep-profile-picture": "You do not have enough reputation to add a profile picture",
 	"not-enough-reputation-min-rep-cover-picture": "You do not have enough reputation to add a cover picture",
-	"already-flagged": "You have already flagged this post",
+	"post-already-flagged": "You have already flagged this post",
+	"user-already-flagged": "You have already flagged this user",
+	"post-flagged-too-many-times": "This post has been flagged by others already",
+	"user-flagged-too-many-times": "This user has been flagged by others already",
 	"self-vote": "You cannot vote on your own post",
 	"too-many-downvotes-today": "You can only downvote %1 times a day",
 	"too-many-downvotes-today-user": "You can only downvote a user %1 times a day",

src/flags.js

@@ -277,7 +277,7 @@ Flags.create = async function (type, id, uid, reason, timestamp) {
 		timestamp = Date.now();
 		doHistoryAppend = true;
 	}
-	const [flagExists, targetExists, canFlag, targetUid, targetCid] = await Promise.all([
+	const [flagExists, targetExists,, targetUid, targetCid] = await Promise.all([
 		// Sanity checks
 		Flags.exists(type, id, uid),
 		Flags.targetExists(type, id),
@@ -287,12 +287,11 @@ Flags.create = async function (type, id, uid, reason, timestamp) {
 		Flags.getTargetCid(type, id),
 	]);
 	if (flagExists) {
-		throw new Error('[[error:already-flagged]]');
+		throw new Error(`[[error:${type}-already-flagged]]`);
 	} else if (!targetExists) {
 		throw new Error('[[error:invalid-data]]');
-	} else if (!canFlag) {
-		throw new Error('[[error:no-privileges]]');
 	}
+
 	const flagId = await db.incrObjectField('global', 'nextFlagId');
 
 	await db.setObject('flag:' + flagId, {
@@ -307,6 +306,7 @@ Flags.create = async function (type, id, uid, reason, timestamp) {
 	await db.sortedSetAdd('flags:byReporter:' + uid, timestamp, flagId); // by reporter
 	await db.sortedSetAdd('flags:byType:' + type, timestamp, flagId);	// by flag type
 	await db.sortedSetAdd('flags:hash', flagId, [type, id, uid].join(':')); // save zset for duplicate checking
+	await db.sortedSetIncrBy('flags:byTarget', 1, [type, id].join(':'));	// by flag target (score is count)
 	await analytics.increment('flags'); // some fancy analytics
 
 	if (targetUid) {
@@ -336,13 +336,28 @@ Flags.exists = async function (type, id, uid) {
 };
 
 Flags.canFlag = async function (type, id, uid) {
-	if (type === 'user') {
+	const limit = meta.config['flags:limitPerTarget'];
-		return true;
+	if (limit > 0) {
+		const score = await db.sortedSetScore('flags:byTarget', `${type}:${id}`);
+		if (score >= limit) {
+			throw new Error(`[[error:${type}-flagged-too-many-times]]`);
+		}
 	}
-	if (type === 'post') {
+
-		return await privileges.posts.can('topics:read', id, uid);
+	const canRead = await privileges.posts.can('topics:read', id, uid);
+	switch (type) {
+		case 'user':
+			return true;
+
+		case 'post':
+			if (!canRead) {
+				throw new Error('[[error:no-privileges]]');
+			}
+			break;
+
+		default:
+			throw new Error('[[error:invalid-data]]');
 	}
-	throw new Error('[[error:invalid-data]]');
 };
 
 Flags.getTarget = async function (type, id, uid) {

src/upgrades/1.14.1/readd_deleted_recent_topics.js

@@ -5,7 +5,7 @@ const db = require('../../database');
 const batch = require('../../batch');
 
 module.exports = {
-	name: 'Re add deleted topics to topics:recent',
+	name: 'Re-add deleted topics to topics:recent',
 	timestamp: Date.UTC(2018, 9, 11),
 	method: async function () {
 		const progress = this.progress;

src/upgrades/1.14.3/track_flags_by_target.js

@@ -0,0 +1,15 @@
+'use strict';
+
+const db = require('../../database');
+
+module.exports = {
+	name: 'New sorted set for tracking flags by target',
+	timestamp: Date.UTC(2020, 6, 15),
+	method: async () => {
+		const flags = await db.getSortedSetRange('flags:hash', 0, -1);
+		await Promise.all(flags.map(async (flag) => {
+			flag = flag.split(':').slice(0, 2);
+			await db.sortedSetIncrBy('flags:byTarget', 1, flag.join(':'));
+		}));
+	},
+};

src/upgrades/TEMPLATE

@@ -1,7 +1,6 @@
 'use strict';
 
 const db = require('../../database');
-const winston = require('winston');
 
 module.exports = {
 	// you should use spaces

src/views/admin/settings/reputation.tpl

@@ -27,21 +27,58 @@
 	</div>
 </div>
 
-
 <div class="row">
 	<div class="col-sm-2 col-xs-12 settings-header">[[admin/settings/reputation:thresholds]]</div>
 	<div class="col-sm-10 col-xs-12">
 		<form>
-			<strong>[[admin/settings/reputation:min-rep-downvote]]</strong><br /> <input type="text" class="form-control" placeholder="0"
+			<div class="form-group">
-			data-field="min:rep:downvote"><br />
+				<label for="min:rep:downvote">[[admin/settings/reputation:min-rep-downvote]]</label>
-			<strong>[[admin/settings/reputation:downvotes-per-day]]</strong><br /> <input type="text" class="form-control" placeholder="10" data-field="downvotesPerDay"><br />
+				<input type="text" class="form-control" placeholder="0" data-field="min:rep:downvote" id="min:rep:downvote">
-			<strong>[[admin/settings/reputation:downvotes-per-user-per-day]]</strong><br /> <input type="text" class="form-control" placeholder="3" data-field="downvotesPerUserPerDay"><br />
+			</div>
-			<strong>[[admin/settings/reputation:min-rep-flag]]</strong><br /> <input type="text" class="form-control" placeholder="0" data-field="min:rep:flag"><br />
+			<div class="form-group">
-			<strong>[[admin/settings/reputation:min-rep-website]]</strong><br /> <input type="text" class="form-control" placeholder="0" data-field="min:rep:website"><br />
+				<label for="downvotesPerDay">[[admin/settings/reputation:downvotes-per-day]]</label>
-			<strong>[[admin/settings/reputation:min-rep-aboutme]]</strong><br /> <input type="text" class="form-control" placeholder="0" data-field="min:rep:aboutme"><br />
+				<input type="text" class="form-control" placeholder="10" data-field="downvotesPerDay" id="downvotesPerDay">
-			<strong>[[admin/settings/reputation:min-rep-signature]]</strong><br /> <input type="text" class="form-control" placeholder="0" data-field="min:rep:signature"><br />
+			</div>
-			<strong>[[admin/settings/reputation:min-rep-profile-picture]]</strong><br /> <input type="text" class="form-control" placeholder="0" data-field="min:rep:profile-picture"><br />
+			<div class="form-group">
-			<strong>[[admin/settings/reputation:min-rep-cover-picture]]</strong><br /> <input type="text" class="form-control" placeholder="0" data-field="min:rep:cover-picture"><br />
+				<label for="downvotesPerUserPerDay">[[admin/settings/reputation:downvotes-per-user-per-day]]</label>
+				<input type="text" class="form-control" placeholder="3" data-field="downvotesPerUserPerDay" id="downvotesPerUserPerDay">
+			</div>
+			<div class="form-group">
+				<label for="min:rep:flag">[[admin/settings/reputation:min-rep-flag]]</label>
+				<input type="text" class="form-control" placeholder="0" data-field="min:rep:flag" id="min:rep:flag">
+			</div>
+			<div class="form-group">
+				<label for="min:rep:website">[[admin/settings/reputation:min-rep-website]]</label>
+				<input type="text" class="form-control" placeholder="0" data-field="min:rep:website" id="min:rep:website">
+			</div>
+			<div class="form-group">
+				<label for="min:rep:aboutme">[[admin/settings/reputation:min-rep-aboutme]]</label>
+				<input type="text" class="form-control" placeholder="0" data-field="min:rep:aboutme" id="min:rep:aboutme">
+			</div>
+			<div class="form-group">
+				<label for="min:rep:signature">[[admin/settings/reputation:min-rep-signature]]</label>
+				<input type="text" class="form-control" placeholder="0" data-field="min:rep:signature" id="min:rep:signature">
+			</div>
+			<div class="form-group">
+				<label for="min:rep:profile-picture">[[admin/settings/reputation:min-rep-profile-picture]]</label>
+				<input type="text" class="form-control" placeholder="0" data-field="min:rep:profile-picture" id="min:rep:profile-picture">
+			</div>
+			<div class="form-group">
+				<label for="min:rep:cover-picture">[[admin/settings/reputation:min-rep-cover-picture]]</label>
+				<input type="text" class="form-control" placeholder="0" data-field="min:rep:cover-picture" id="min:rep:cover-picture">
+			</div>
+		</form>
+	</div>
+</div>
+
+<div class="row">
+	<div class="col-sm-2 col-xs-12 settings-header">[[admin/settings/reputation:flags]]</div>
+	<div class="col-sm-10 col-xs-12">
+		<form>
+			<div class="form-group">
+				<label for="flags:limitPerTarget">[[admin/settings/reputation:flags.limit-per-target]]</label>
+				<input type="text" class="form-control" placeholder="[[admin/settings/reputation:flags.limit-per-target-placeholder]]" data-field="flags:limitPerTarget" id="flags:limitPerTarget">
+			</div>
 		</form>
 	</div>
 </div>