Hapi.js plugin to autoversion files based on when they last changed: `/file.js?v={mtime_timestamp}`

controller.js

/**
 * DFP Test Page Controller
 *
 * This pulls in the data we need to output
 * a story URL
 *
 * @pattern /dfp/
 */
'use strict';

module.exports = {
	id: 'dfp',
	handler: function ( request, reply ) {
		reply.view( 'entry_dfp', {
			title: 'DFP Ad-units',
			desc: 'Changing ads when the viewport scrolls beyond a specific point.',
			assets: {
				dev: {
					css: [ {
						file: '/_/dist/css/view-dfp.dev.css'
					} ]
				},
				prod: {
					css: [ {
						file: '/_/dist/css/view-dfp.prod.css'
					} ]
				}
			}
		} );
	}
};

plugin.js

/**
 * mtime based asset versioning
 *
 * Autoversion files based on when they last changed:
 * /file.js?v={mtime_timestamp}
 */
'use strict';

var _ = require( 'lodash' ),
	is = require( 'is_js' ),
	fs = require( 'fs' );

exports.register = function ( server, options, next ) {

	var environment = global.__config.env;

	// hook: 'onPostHandler'
	server.ext( 'onPostHandler', function ( request, reply ) {
		var response = request.response;

		// must be view
		if ( response.variety !== 'view' )
			return reply.continue();

		// defaults if empty
		if ( is.not.existy( response.source.context ) ) {
			response.source.context = {};
		}
		if ( is.not.existy( response.source.context.assets ) ) {
			response.source.context.assets = {};
		}

		// global css/js
		var globalAssets = options[ environment ];
		var localAssets = response.source.context.assets[ environment ];

		// merge controller CSS/JS with globals
		if ( is.existy( localAssets ) && is.not.empty( localAssets ) ) {

			// css
			if ( is.existy( localAssets.css ) ) {
				globalAssets.css = _.union( globalAssets.css, localAssets.css );
			}

			// js
			if ( is.existy( localAssets.js ) ) {
				globalAssets.js = _.union( globalAssets.js, localAssets.js );
			}

		}

		console.log( globalAssets );

		// mtime for each asset
		_.each( globalAssets, function ( files, type ) {

			_.each( files, function ( obj, key ) {

				// skip versioning?
				if ( _.has( obj, 'version' ) && obj.version === false )
					return;

				// file last modified timestamp
				var absLoc = obj.file.replace( '/_/', '/public/' );
				var filePath = require.main.filename.replace( 'server.js', absLoc );
				var mtime = new Date( fs.statSync( filePath ).mtime ).getTime() / 1000;

				// add property
				globalAssets[ type ][ key ].version = mtime;

			} );

		} );

		// add final assets obj to context
		response.source.context.assets = globalAssets;

		return reply.continue();
	} );

	return next();
};

/**
 * Plugin metadata
 */
exports.register.attributes = {
	name: 'mittr-mtime-assets',
	version: '0.0.1'
};