Plugin example: Custom API homepage for NodeBB, returns topics instead of posts per category

plugin.js

var async = require('async'),
	categories = module.parent.require('./categories');

var Plugin = {};

function renderHomepage(req, res, next) {
	var uid = req.user ? req.user.uid : 0;

	/*
	* For reference, this is taken straight from controllers/index.js (controllers.home)
	*/
	async.parallel({
		header: function (next) {
			res.locals.metaTags = [{
				name: "title",
				content: meta.config.title || 'NodeBB'
			}, {
				name: "description",
				content: meta.config.description || ''
			}, {
				property: 'og:title',
				content: 'Index | ' + (meta.config.title || 'NodeBB')
			}, {
				property: 'og:type',
				content: 'website'
			}];

			if(meta.config['brand:logo']) {
				res.locals.metaTags.push({
					property: 'og:image',
					content: meta.config['brand:logo']
				});
			}

			next(null);
		},
		categories: function (next) {
			var uid = req.user ? req.user.uid : 0;
			categories.getAllCategories(uid, function (err, data) {
				if (err) {
					return next(err);
				}

				data.categories = data.categories.filter(function (category) {
					return !category.disabled;
				});

				/*
				* This is the modified function for getting category topics, instead of category posts
				*/
				function getRecentTopics(category, callback) {
					categories.getCategoryTopics(category.cid, 0, parseInt(category.numRecentReplies, 10), uid, function (err, topics) {
						category.topics = topics;
						category.topic_count = topics.length;
						callback(null);
					});
				}

				async.filter(data.categories, function (category, next) {
					privileges.categories.can('read', category.cid, uid, function(err, canRead) {
						next(!err && canRead);
					});
				}, function(visibleCategories) {
					data.categories = visibleCategories;

					async.each(data.categories, getRecentTopics, function (err) {
						next(err, data.categories);
					});
				});
			});
		}
	}, function (err, data) {
		res.render('home', data);
	});

	res.render('home', {});
}

Plugin.init = function(app, middleware, controllers) {
	app.get('/api/home', renderHomepage);
};