added new hook 'action:meta.override404' so plugins can override the regular handling of pages that are not found

src/controllers/helpers.js

@@ -6,12 +6,19 @@ var nconf = require('nconf'),
 
 	translator = require('../../public/src/translator'),
 	categories = require('../categories'),
+	plugins = require('../plugins'),
 	meta = require('../meta');
 
 var helpers = {};
 
 helpers.notFound = function(req, res, error) {
-	if (res.locals.isAPI) {
+	if (plugins.hasListeners('action:meta.override404')) {
+		plugins.fireHook('action:meta.override404', {
+			req: req,
+			res: res,
+			error: error
+		});
+	} else if (res.locals.isAPI) {
 		res.status(404).json({path: req.path.replace(/^\/api/, ''), error: error});
 	} else {
 		res.status(404).render('404', {path: req.path, error: error});

src/routes/index.js

@@ -173,6 +173,7 @@ module.exports = function(app, middleware) {
 
 function handle404(app, middleware) {
 	app.use(function(req, res, next) {
+		if (!plugins.hasListeners('action:meta.override404')) {
 			var relativePath = nconf.get('relative_path');
 			var	isLanguage = new RegExp('^' + relativePath + '/language/[\\w]{2,}/.*.json'),
 				isClientScript = new RegExp('^' + relativePath + '\\/src\\/.+\\.js');
@@ -198,6 +199,13 @@ function handle404(app, middleware) {
 			} else {
 				res.status(404).type('txt').send('Not found');
 			}
+		} else {
+			plugins.fireHook('action:meta.override404', {
+				req: req,
+				res: res,
+				error: {}
+			});
+		}
 	});
 }