server/httphandler.js

   1 var url         = require('url'),
   2     fs          = require('fs'),
   3     node_static = require('node-static'),
   4     Negotiator  = require('negotiator'),
   5     _           = require('lodash'),
   6     config      = require('./configuration.js'),
   7     SettingsGenerator = require('./settingsgenerator.js');
   8
   9
  10
  11
  12 var HttpHandler = function (config) {
  13     var public_http = config.public_http || 'client/';
  14     this.file_server = new node_static.Server(public_http);
  15 };
  16
  17 module.exports.HttpHandler = HttpHandler;
  18
  19
  20
  21 HttpHandler.prototype.serve = function (request, response) {
  22     // The incoming requests base path (ie. /kiwiclient)
  23     var base_path = global.config.http_base_path || '/kiwi',
  24         base_path_regex;
  25
  26     // Trim of any trailing slashes
  27     if (base_path.substr(base_path.length - 1) === '/') {
  28         base_path = base_path.substr(0, base_path.length - 1);
  29     }
  30
  31     // Build the regex to match the base_path
  32     base_path_regex = base_path.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&');
  33
  34     // Any asset request to head into the asset dir
  35     request.url = request.url.replace(base_path + '/assets/', '/assets/');
  36
  37     // Any src request to head into the src dir
  38     request.url = request.url.replace(base_path + '/src/', '/src/');
  39
  40     // Any requests for /client to load the index file
  41     if (request.url.match(new RegExp('^' + base_path_regex + '([/$]|$)', 'i'))) {
  42         request.url = '/index.html';
  43     }
  44
  45     // If the 'magic' translation is requested, figure out the best language to use from
  46     // the Accept-Language HTTP header. If nothing is suitible, fallback to our en-gb default translation
  47     if (request.url.substr(0, 16) === '/assets/locales/') {
  48         if (request.url === '/assets/locales/magic.json') {
  49             return serveMagicLocale.call(this, request, response);
  50         } else {
  51             response.setHeader('Content-Language', request.url.substr(16, request.url.indexOf('.') - 16));
  52         }
  53     } else if (request.url.substr(0, 21) === '/assets/settings.json') {
  54         return serveSettings.call(this, request, response);
  55     }
  56
  57     this.file_server.serve(request, response, function (err) {
  58         if (err) {
  59             response.writeHead(err.status, err.headers);
  60             response.end();
  61         }
  62     });
  63 };
  64
  65
  66 // Cached list of available translations
  67 var cached_available_locales = [];
  68
  69 // Get a list of the available translations we have
  70 fs.readdir('client/assets/locales', function (err, files) {
  71     files.forEach(function (file) {
  72         if (file.substr(-5) === '.json') {
  73             cached_available_locales.push(file.slice(0, -5));
  74         }
  75     });
  76 });
  77
  78
  79
  80 /**
  81  * Handle the /assets/locales/magic.json request
  82  * Find the closest translation we have for the language
  83  * set in the browser.
  84  **/
  85 var serveMagicLocale = function (request, response) {
  86     var default_locale_id = 'en-gb',
  87         found_locale, negotiator;
  88
  89     if (!request.headers['accept-language']) {
  90         // No accept-language specified in the request so send the default
  91         found_locale = default_locale_id;
  92
  93     } else {
  94         negotiator = new Negotiator(request);
  95         found_locale = negotiator.language(cached_available_locales);
  96     }
  97
  98     // Send a locale to the browser
  99     this.file_server.serveFile('/assets/locales/' + found_locale + '.json', 200, {
 100         Vary: 'Accept-Language',
 101         'Content-Language': found_locale
 102     }, request, response);
 103 };
 104
 105
 106
 107 /**
 108  * Handle the settings.json request
 109  */
 110 var serveSettings = function(request, response) {
 111     var referrer_url,
 112         debug = false,
 113         settings;
 114
 115     // Check the referrer for a debug option
 116     if (request.headers['referer']) {
 117         referrer_url = url.parse(request.headers['referer'], true);
 118         if (referrer_url.query && referrer_url.query.debug) {
 119             debug = true;
 120         }
 121     }
 122
 123     SettingsGenerator.get(debug, function(settings) {
 124         if (request.headers['if-none-match'] && request.headers['if-none-match'] === settings.hash) {
 125             response.writeHead(304, 'Not Modified');
 126             return response.end();
 127         }
 128
 129         response.writeHead(200, {
 130             'ETag': settings.hash,
 131             'Content-Type': 'application/json'
 132         });
 133         response.end(settings.settings);
 134     });
 135 };