feat(writeapi): added DELETE /groups/:slug/membership/:uid route

src/controllers/write/groups.js

@@ -1,9 +1,13 @@
 'use strict';
 
+const validator = require('validator');
+
 const user = require('../../user');
 const groups = require('../../groups');
 const events = require('../../events');
 const meta = require('../../meta');
+const utils = require('../../utils');
+const notifications = require('../../notifications');
 
 const helpers = require('../helpers');
 
@@ -85,6 +89,42 @@ Groups.join = async (req, res) => {
 	});
 };
 
+Groups.leave = async (req, res) => {
+	const [group, userExists] = await Promise.all([
+		groups.getByGroupslug(req.params.slug, {
+			uid: req.params.uid,
+		}),
+		user.exists(req.params.uid),
+	]);
+
+	if (!userExists) {
+		throw new Error('[[error:invalid-uid]]');
+	} else if (group.disableLeave) {
+		throw new Error('[[error:group-leave-disabled]]');
+	} else if (!group.isMember) {
+		// No change
+		return helpers.formatApiResponse(200, res);
+	}
+
+	await groups.leave(group.name, req.params.uid);
+
+	// Notify owners of user having left
+	const username = await user.getUserField(req.params.uid, 'username');
+	const notification = await notifications.create({
+		type: 'group-leave',
+		bodyShort: '[[groups:membership.leave.notification-title, ' + username + ', ' + group.name + ']]',
+		nid: 'group:' + validator.escape(group.name) + ':uid:' + req.params.uid + ':group-leave',
+		path: '/groups/' + utils.slugify(group.name),
+	});
+	const uids = await groups.getOwners(group.name);
+	await notifications.push(notification, uids);
+
+	helpers.formatApiResponse(200, res);
+	logGroupEvent(req, 'group-leave', {
+		groupName: group.name,
+	});
+};
+
 function logGroupEvent(req, event, additional) {
 	events.log({
 		type: event,