opening-hours.js

var fs = require('fs');
var express = require('express');
var opening_hours = require('opening_hours');

var xmlParser = require('./data/parse_xml.js')
var data = xmlParser.getData();

/* the opening hours library needs the result of nominatim to evaluate
   holidays. the following object was obtained from this uri:
   https://nominatim.openstreetmap.org/reverse?format=json&lat=48.3984100&lon=9.9915500&zoom=5&addressdetails=1
   (coordinates are of the city Ulm)

   this works on the assumption that the state is equal for all facilities in the data set. */
var nominatim = {
	place_id: '159221147',
	licence: 'Data © OpenStreetMap contributors, ODbL 1.0.  http:\/\/www.openstreetmap.org\/copyright',
	osm_type: 'relation',
	osm_id: '62611',
	lat: '48.6296972',
	lon: '9.1949534',
	display_name: 'Baden-Württemberg, Germany',
	address: {
		state: 'Baden-Württemberg',
		country: 'Germany',
		country_code: 'de'
	},
	boundingbox: ['47.5324787', '49.7912941', '7.5117461', '10.4955731']
};

var parse_err_output = false;

var app = express();
app.get('/', function(req, res) {
	var file = '/static/index.html';
	if ('_escaped_fragment_' in req.query)
		file = '/static/ajax-snapshot.html';

	try {
		res.sendfile(__dirname + file);
	} catch(err) {
		res.send(404);
	}
});

app.use(express.static(__dirname + '/static'));
app.use(express.bodyParser());

var server = require('http').createServer(app);

function generateOpenEntities(date) {
	var open_entities = [];
	for (var i in data) {
		try {
			var oh = new opening_hours(data[i].opening_hours, nominatim);
		} catch (err) {
			/* only output error messages at the first time they are thrown.
			   otherwise our program will flood stdout on each /get_entries request */
			if (!parse_err_output) {
				console.log('error while parsing ' + data[i].opening_hours + ':');
				console.log(err);
				console.log(JSON.stringify(data[i]) + '\n');
			}
			continue;
		}

		var it = oh.getIterator(date);

		var is_open = it.getState();
		var unknown = it.getUnknown();

		/* still open in 15 minutes? */
		var soon = new Date(date.getTime() + 15*60000);
		data[i].closing_soon = false;
		if (it.advance() && it.getDate().getTime() < soon.getTime() && it.getStateString(true) !== 'closed')
			data[i].closing_soon = true;

		data[i].unknown = unknown;
		if (is_open || unknown) {
			open_entities.push(data[i]);
		}
	}
	parse_err_output = true;

	return open_entities;
}

app.get('/get_entries', function(req, res) {
	var now = new Date(parseInt(req.query.ms));
	res.send(generateOpenEntities(now));
});


server.listen(process.env.PORT || 3046, function() {
	console.log('Listening on port ' + server.address().port);
});