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index.js
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index.js
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'use strict';
var qs = require('./lib/querystring');
var request = require('./lib/request');
var parsers = require('./lib/parsers');
var dateUtil = require('./lib/date-util');
var BASE = 'https://open-api.bahn.de/bin/rest.exe';
var RE_STATION_ID = /^\d{9}$/;
function fahrplan(key) {
if (!key) throw new Error('No API key provided');
function findStation(query) {
return request(
BASE + '/location.name?' + qs.stringify({
authKey: key,
input: query,
format: 'json',
}))
.then(function (res) { res.api = api; return res; })
.then(parsers.station);
}
function getStation(query) {
return findStation(query)
.then(function (result) {
if (result.stations.length) return result.stations[0];
return null;
});
}
function findServices(type, query, date) {
var endpoint;
if (type === 'departures') endpoint = '/departureBoard';
else if (type === 'arrivals') endpoint = '/arrivalBoard';
else throw new Error('Type must be either "departures" or "arrivals"');
if (!date) date = Date.now();
// We want to support station names as well as IDs, but the API only
// officially supports IDs.
// The API supports querying for things that aren't IDs, but the behaviour
// is not documented and surprising (e.g. searching for "B") only returns
// results for Berlin Südkreuz, not Berlin Hbf.
// For predictable behaviour, we'll pass anything that doesn't look like an
// ID through getStation() first.
// In addition, we also support passing station objects (any object with an
// `id` or `name` property and Promises that resolve to them
var station;
if (query.id && RE_STATION_ID.test(query.id)) {
// An object with an `id` property that looks like a station ID
station = query;
} else if (RE_STATION_ID.test(query)) {
// A string that looks like a station ID
station = { id: query };
} else if (typeof query.then === 'function') {
// A Promise, let's hope it resolves to a station
station = query;
} else if (query.name) {
// An object with a `name` property,
// let's use that to look up a station id
station = getStation(query.name);
} else {
// Last resort, let's make sure it's a string and look it up
station = getStation('' + query);
}
// Whatever we have now is either something that has an id property
// or will (hopefully) resolve to something that has an id property.
// Resolve it if it needs resolving, then look up a timetable for it.
return Promise.resolve(station)
.then(function (station) {
return request(
BASE + endpoint + '?' + qs.stringify({
authKey: key,
id: station.id,
date: dateUtil.formatDate(date),
time: dateUtil.formatTime(date),
format: 'json',
})
)
})
.then(function (res) { res.api = api; return res; })
.then(parsers.stationBoard);
}
function getItinerary(url) {
return request(url)
.then(function (res) { res.api = api; return res; })
.then(parsers.itinerary);
}
var api = {
station: {
find: findStation,
get: getStation,
},
departure: {
find: function(stationId, date) { return findServices('departures', stationId, date) },
},
arrival: {
find: function(stationId, date) { return findServices('arrivals', stationId, date) },
},
itinerary: {
get: getItinerary,
},
};
return api;
}
module.exports = fahrplan;