server/httphandler.js

   1 var url         = require('url'),
   2     fs          = require('fs'),
   3     node_static = require('node-static'),
   4     _           = require('lodash');
   5
   6
   7
   8 var HttpHandler = function (config) {
   9     var public_html = config.public_html || 'client/';
  10     this.file_server = new node_static.Server(public_html);
  11 };
  12
  13 module.exports.HttpHandler = HttpHandler;
  14
  15
  16
  17 HttpHandler.prototype.serve = function (request, response) {
  18     // The incoming requests base path (ie. /kiwiclient)
  19     var base_path = global.config.http_base_path || '/kiwi',
  20         base_path_regex;
  21
  22     // Trim of any trailing slashes
  23     if (base_path.substr(base_path.length - 1) === '/') {
  24         base_path = base_path.substr(0, base_path.length - 1);
  25     }
  26
  27     // Build the regex to match the base_path
  28     base_path_regex = base_path.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&');
  29
  30     // Any asset request to head into the asset dir
  31     request.url = request.url.replace(base_path + '/assets/', '/assets/');
  32
  33     // Any requests for /client to load the index file
  34     if (request.url.match(new RegExp('^' + base_path_regex + '([/$]|$)', 'i'))) {
  35         request.url = '/';
  36     }
  37
  38     // If the 'magic' translation is requested, figure out the best language to use from
  39     // the Accept-Language HTTP header. If nothing is suitible, fallback to our en-gb default translation
  40     if (request.url.substr(0, 16) === '/assets/locales/') {
  41         if (request.url === '/assets/locales/magic.json') {
  42             return serveMagicLocale.call(this, request, response);
  43         } else {
  44             response.setHeader('Content-Language', request.url.substr(16, request.url.indexOf('.') - 16));
  45         }
  46     }
  47
  48     this.file_server.serve(request, response, function (err) {
  49         if (err) {
  50             response.writeHead(err.status, err.headers);
  51             response.end();
  52         }
  53     });
  54 };
  55
  56 var serveMagicLocale = function (request, response) {
  57     var that = this;
  58     if (request.headers['accept-language']) {
  59         fs.readdir('client/assets/locales', function (err, files) {
  60             var available = [],
  61                 i = 0,
  62                 langs = request.headers['accept-language'].split(','); // Example: en-gb,en;q=0.5
  63
  64             files.forEach(function (file) {
  65                 if (file.substr(-5) === '.json') {
  66                     available.push(file.slice(0, -5));
  67                 }
  68             });
  69
  70             for (i = 0; i < langs.length; i++) {
  71                 langs[i]= langs[i].split(';q=');
  72                 langs[i][1] = (typeof langs[i][1] === 'string') ? parseFloat(langs[i][1]) : 1.0;
  73             }
  74             langs.sort(function (a, b) {
  75                 return b[1] - a[1];
  76             });
  77             for (i = 0; i < langs.length; i++) {
  78                 langs[i][0] = langs[i][0].toLowerCase();
  79                 if (langs[i][0] === '*') {
  80                     break;
  81                 } else if (_.contains(available, langs[i][0])) {
  82                     return that.file_server.serveFile('/assets/locales/' + langs[i][0] + '.json', 200, {Vary: 'Accept-Language', 'Content-Language': langs[i][0]}, request, response);
  83                 }
  84             }
  85             serveFallbackLocale.call(this, request, response);
  86         });
  87     } else {
  88         serveFallbackLocale.call(this, request, response);
  89     }
  90 };
  91
  92 var serveFallbackLocale = function (request, response) {
  93     //en-gb is our default language, so we serve this as the last possible answer for everything
  94     this.file_server.serveFile('/assets/locales/en-gb.json', 200, {Vary: 'Accept-Language', 'Content-Language': 'en-gb'}, request, response);
  95 };