compare-geojson/comparators/pokemon-footway.js

Compare a features new and old versions in GeoJSON

'use strict';

var request = require('request');
var moment = require('moment');
var sax = require('sax');

module.exports = pokemonFootway;

function getAccountCreated(userID, callback) {
  var url = ' http://api.openstreetmap.org/api/0.6/user/' + userID;
  request(url, function (error, response, body) {
    if (error) return callback(error);

    if (!error && response.statusCode === 200) {
      var accountCreated;

      var parser = sax.createStream(true);
      parser.on('opentag', function(element) {
        if ('attributes' in element && ('account_created' in element.attributes)) {
          accountCreated = element.attributes.account_created;
        }
      });
      parser.on('end', function() {
        return callback(null, moment(accountCreated));
      });
      parser.write(body);
      parser.end();

    } else {
      return callback(null, null);
    }
  });
}

function pokemonFootway(newVersion, oldVersion, callback) {
  // Yeah. moment.js is wierd, month start from zero
  var newUserDate = moment([2016, 11, 23]);

  if (newVersion && newVersion.properties && newVersion.properties.highway === 'footway' && newVersion.properties['osm:version'] === 1) {
    getAccountCreated(newVersion.properties['osm:uid'], function (error, accountCreated) {
      if (error) {
        console.log(String(error));
        return callback(null, {});
      }
      if (accountCreated.unix() >= newUserDate.unix()) {
        return callback(null, {
          'result:pokemon_footway': true
        });
      } else {
        return callback(null, {});
      }
    });
  } else {
    return callback(null, {});
  }
}