lib/googleweather.js

   1 /* Modified version of node-googleweather by maxkueng
   2  * (Removed the celsius and kmh conversions)
   3  * Original library can be found at:
   4  * https://github.com/maxkueng/node-googleweather/
   5  *
   6 MIT License
   7
   8 Copyright (c) 2011 Max Kueng (http://maxkueng.com/)
   9
  10 Permission is hereby granted, free of charge, to any person obtaining
  11 a copy of this software and associated documentation files (the
  12 "Software"), to deal in the Software without restriction, including
  13 without limitation the rights to use, copy, modify, merge, publish,
  14 distribute, sublicense, and/or sell copies of the Software, and to
  15 permit persons to whom the Software is furnished to do so, subject to
  16 the following conditions:
  17
  18 The above copyright notice and this permission notice shall be
  19 included in all copies or substantial portions of the Software.
  20
  21 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 */
  29
  30 var request = require('request');
  31 var jsdom = require('jsdom');
  32
  33 Date.prototype.pad = function (n) {
  34     return (n < 10) ? '0' + n : n;
  35 };
  36
  37 Date.prototype.toISODate = function () {
  38     return this.getFullYear() + '-'
  39         + this.pad(this.getMonth() + 1) + '-'
  40         + this.pad(this.getDate());
  41 };
  42
  43 var get = function (callback, location, forecastDate) {
  44     var currentConditions = {
  45         'date' : null,
  46         'condition' : null,
  47         'temperature' : null,
  48         'humidity' : null,
  49         'wind' : {
  50             'direction' : null,
  51             'speed' : null
  52         }
  53     };
  54
  55     var forecast = [];
  56
  57     var uri = 'http://www.google.com/ig/api?weather='
  58         + escape(location);
  59
  60     request({
  61         'method' : 'GET',
  62         'uri' : uri,
  63         'headers' : {
  64             'User-Agent' : 'Nintendo Gameboy/1.0'
  65         }
  66     }, function (error, response, body) {
  67         if (!error && response.statusCode == 200) {
  68             jsdom.env(body, [],
  69                 function(errors, window) {
  70                     try {
  71                         var document = window.document;
  72                         var info = document.getElementsByTagName('forecast_information')[0];
  73                         var current = document.getElementsByTagName('current_conditions')[0];
  74                         var forecasts = document.getElementsByTagName('forecast_conditions');
  75
  76                         var baseDateString = info.getElementsByTagName('forecast_date')[0].getAttribute('data');
  77                         var baseDate = new Date(baseDateString);
  78
  79                         currentConditions.date = baseDateString;
  80                         currentConditions.condition = current.getElementsByTagName('condition')[0].getAttribute('data');
  81                         currentConditions.temperature = current.getElementsByTagName('temp_f')[0].getAttribute('data');
  82
  83                         var humidityString =  current.getElementsByTagName('humidity')[0].getAttribute('data');
  84                         currentConditions.humidity = /(\d+)%/.exec(humidityString)[1];
  85
  86                         var windString =  current.getElementsByTagName('wind_condition')[0].getAttribute('data');
  87                         var windMatches = /([NESW]+)\sat\s([0-9]+)\smph/.exec(windString);
  88                         currentConditions.wind.direction = windMatches[1];
  89                         currentConditions.wind.speed = windMatches[2];
  90
  91                         for (var i = 0; i < forecasts.length; i++) {
  92                             var d = new Date(baseDate.getTime() + ( i * 24 * 3600 * 1000 ));
  93                             var condition = forecasts[i].getElementsByTagName('condition')[0].getAttribute('data');
  94                             var lowTemp = forecasts[i].getElementsByTagName('low')[0].getAttribute('data');
  95                             var highTemp = forecasts[i].getElementsByTagName('high')[0].getAttribute('data');
  96
  97                             var forecastDay = {
  98                                 'date' : d.toISODate(),
  99                                 'condition' : condition,
 100                                 'temperature' : {
 101                                     'low' : lowTemp,
 102                                     'high' : highTemp
 103                                 }
 104                             };
 105
 106                             forecast[d.toISODate()] = forecastDay;
 107                         }
 108
 109                         callback(currentConditions, forecast[forecastDate]);
 110                     } catch(err) {
 111                         callback(null, null);
 112                         return;
 113                     }
 114                 }
 115             );
 116         }
 117     });
 118 };
 119
 120 exports.get = get;