# hafas-client

**A client for HAFAS public transport APIs**. Sort of like [public-transport-enabler](https://github.com/schildbach/public-transport-enabler), but with a smaller scope. It also [contains customisations](p) for the following transport networks:

- [Deutsche Bahn](https://en.wikipedia.org/wiki/Deutsche_Bahn) - [docs](p/db/readme.md) – [usage example](p/db/example.js) – [src](p/db/index.js)
- [Berlin public transport](https://en.wikipedia.org/wiki/Verkehrsverbund_Berlin-Brandenburg) - [docs](p/vbb/readme.md) – [usage example](p/vbb/example.js) – [src](p/vbb/index.js)

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## Background

There's [a company called HaCon](http://hacon.de) that sells [a public transport management system called HAFAS](https://de.wikipedia.org/wiki/HAFAS). It is [used by companies all over Europe](https://gist.github.com/derhuerst/2b7ed83bfa5f115125a5) to serve routing and departure information for apps. All those endpoints are similar, with the same terms and API routes, but have slightly different options, filters and enable features.

`hafas-client` contains all logic for communicating with these, as well as serialising from and parsing to [*Friendly Public Transport Format (FPTF)* `1.0.1`](https://github.com/public-transport/friendly-public-transport-format/blob/1.0.1/spec/readme.md). Endpoint-specific customisations (called "profiles" here) increase the quality of the returned data.


## Installing

```shell
npm install hafas-client
```


## API

- [`journeys(from, to, [opt])`](docs/journeys.md) – get journeys between locations
- [`journeyLeg(ref, name, [opt])`](docs/journey-leg.md) – get details for a leg of a journey
- [`departures(station, [opt])`](docs/departures.md) – query the next departures at a station
- [`locations(query, [opt])`](docs/locations.md) – find stations, POIs and addresses
- [`nearby(latitude, longitude, [opt])`](docs/nearby.md) – show stations & POIs around
- [`radar(query, [opt])`](docs/radar.md) – find all vehicles currently in a certain area


## Usage

```js
const createClient = require('hafas-client')
const dbProfile = require('hafas-client/p/db')

// create a client with Deutsche Bahn profile
const client = createClient(dbProfile)

// Berlin Jungfernheide to München Hbf
client.journeys('8011167', '8000261', {results: 1})
.then(console.log)
.catch(console.error)
```

The returned [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/promise) will resolved with an array of one `journey` in the [*FPTF* `1.0.1`](https://github.com/public-transport/friendly-public-transport-format/blob/1.0.1/spec/readme.md).

```js
[ {
	legs: [ {
		id: '1|100067|48|81|17122017',
		origin: {
			type: 'station',
			id: '8089100',
			name: 'Berlin Jungfernheide (S)',
			location: {
				type: 'location',
				latitude: 52.530291,
				longitude: 13.299451
			},
			products: { /* … */ }
		},
		departure: '2017-12-17T17:05:00.000+01:00',
		departurePlatform: '5',
		destination: {
			type: 'station',
			id: '8089118',
			name: 'Berlin Beusselstraße',
			location: { /* … */ },
			products: { /* … */ }
		},
		arrival: '2017-12-17T17:08:00.000+01:00',
		arrivalPlatform: '1',
		line: {
			type: 'line',
			id: '41172',
			name: 'S 41',
			public: true,
			mode: 'train',
			product: 'suburban',
			class: 16,
			productCode: 4
		},
		direction: 'Ringbahn ->'
	}, /* … */ {
		origin: {
			type: 'station',
			id: '730749',
			name: 'Berlin Hauptbahnhof (S+U), Berlin',
			location: {
				type: 'location',
				latitude: 52.526461,
				longitude: 13.369378
			},
			products: { /* … */ }
		},
		departure: '2017-12-17T17:25:00.000+01:00',
		destination: {
			type: 'station',
			id: '8098160',
			name: 'Berlin Hbf (tief)',
			location: { /* … */ },
			products: { /* … */ }
		},
		arrival: '2017-12-17T17:33:00.000+01:00',
		mode: 'walking',
		public: true
	}, {
		id: '1|70906|0|81|17122017',
		origin: {
			type: 'station',
			id: '8098160',
			name: 'Berlin Hbf (tief)',
			location: { /* … */ },
			products: { /* … */ }
		},
		departure: '2017-12-17T17:37:00.000+01:00',
		departurePlatform: '1',
		destination: {
			type: 'station',
			id: '8000261',
			name: 'München Hbf',
			location: { /* … */ },
			products: { /* … */ }
		},
		arrival: '2017-12-17T22:45:00.000+01:00',
		arrivalPlatform: '13',
		line: { /* … */ },
		direction: 'München Hbf'
	} ],
	origin: {
		type: 'station',
		id: '8089100',
		name: 'Berlin Jungfernheide (S)',
		location: { /* … */ },
		products: { /* … */ }
	},
	departure: '2017-12-17T17:05:00.000+01:00',
	destination: {
		type: 'station',
		id: '8000261',
		name: 'München Hbf',
		location: { /* … */ },
		products: { /* … */ }
	},
	arrival: '2017-12-17T22:45:00.000+01:00',
	price: {
		amount: null,
		hint: 'No pricing information available.'
	}
} ]
```


## Related

- [*Friendly Public Transport Format*](https://github.com/public-transport/friendly-public-transport-format#friendly-public-transport-format-fptf) – A format for APIs, libraries and datasets containing and working with public transport data.
- [`db-hafas`](https://github.com/derhuerst/db-hafas#db-hafas) – JavaScript client for the DB HAFAS API.
- [`vbb-hafas`](https://github.com/derhuerst/vbb-hafas#vbb-hafas) – JavaScript client for Berlin & Brandenburg public transport HAFAS API.
- [`hafas-departures-in-direction`](https://github.com/derhuerst/hafas-departures-in-direction#hafas-departures-in-direction) – Pass in a HAFAS client, get departures in a certain direction.
- [`hafas-collect-departures-at`](https://github.com/derhuerst/hafas-collect-departures-at#hafas-collect-departures-at) – Utility to collect departures, using any HAFAS client.
- [`hafas-rest-api`](https://github.com/derhuerst/hafas-rest-api#hafas-rest-api) – Expose a HAFAS client via an HTTP REST API.
- [List of european long-distance transport operators, available API endpoints, GTFS feeds and client modules.](https://github.com/public-transport/european-transport-operators)
- [Collection of european transport JavaScript modules.](https://github.com/public-transport/european-transport-modules)


## Contributing

If you **have a question**, **found a bug** or want to **propose a feature**, have a look at [the issues page](https://github.com/derhuerst/hafas-client/issues).