rewrite docs, part 1 📝
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Jannis R
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6 changed files with 352 additions and 33 deletions
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docs/getting-started.md
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319
docs/getting-started.md
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# Getting Started with `v5.db.transport.rest`
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Let's walk through the **requests that are necessary to implement a typical basic transit app**.
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*Note:* To properly & securely handle user input containing URL-unsafe characters, always [URL-encode](https://en.wikipedia.org/wiki/Percent-encoding) your query parameters!
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The following code snippets use [`curl`](https://curl.haxx.se) (a versatile command line HTTP tool) and [`jq`](https://stedolan.github.io/jq/) (the command line swiss army knife for processing JSON).
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### 1. search for stops
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The `/locations?query=…` route allows you to query stops, points of interest (POIs) & addresses. We're only interested in stops though, so we filter using `poi=false&addresses=false`:
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```shell
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curl 'https://v5.db.transport.rest/locations?poi=false&addresses=false&query=südkreuz' -s | jq
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```
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```js
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[
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{
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"type": "stop",
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"id": "8011113",
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"name": "Berlin Südkreuz",
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"location": {
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"type": "location",
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"id": "8011113",
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"latitude": 52.47623,
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"longitude": 13.365863
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},
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"products": {
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"nationalExpress": true,
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"national": true,
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// …
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}
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},
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{
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"type": "stop",
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"id": "731654",
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"name": "Südkreuz Bahnhof (S), Berlin",
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"location": {
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"type": "location",
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"id": "731654",
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"latitude": 52.476265,
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"longitude": 13.3642
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},
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"products": {
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"nationalExpress": true,
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"national": true,
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"regionalExp": true,
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"regional": true,
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"suburban": true,
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"bus": true,
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"ferry": false,
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"subway": false,
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"tram": false,
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"taxi": false
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}
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},
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{
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"type": "stop",
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"id": "727256",
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"name": "Südkreuz Bahnhof (S)/Ostseite, Berlin",
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"location": {
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"type": "location",
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"id": "727256",
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"latitude": 52.47436,
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"longitude": 13.366843
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},
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"products": {
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// …
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}
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},
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// …
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]
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```
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### 2. fetch departures at a stop
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Let's fetch 5 of the next departures at *Berlin Südkreuz* (which has the ID `8011113`):
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```shell
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curl 'https://v5.db.transport.rest/stops/8011113/departures?results=5' -s | jq
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```
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```js
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[
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{
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"tripId": "1|1168945|24|80|1052020",
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"direction": "Schöneberg, Reichartstr.",
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"line": {
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"type": "line",
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"id": "5-vbbbvb-248",
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"name": "Bus 248",
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"mode": "bus",
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"product": "bus",
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// …
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},
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"when": "2020-05-01T18:39:00+02:00",
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"plannedWhen": "2020-05-01T18:38:00+02:00",
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"delay": 60,
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"platform": null,
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"plannedPlatform": null,
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"stop": {
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"type": "stop",
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"id": "727256",
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"name": "Südkreuz Bahnhof (S)/Ostseite, Berlin",
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"location": { /* … */ },
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"products": { /* … */ },
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"station": {
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"type": "station",
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"id": "8011113",
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"name": "Berlin Südkreuz",
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"location": { /* … */ },
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"products": { /* … */ },
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}
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},
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"remarks": [],
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},
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// …
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{
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"tripId": "1|322308|0|80|1052020",
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"direction": "Lutherstadt Wittenberg Hbf",
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"line": {
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"type": "line",
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"id": "re-3",
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"name": "RE 3",
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"mode": "train",
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"product": "regional",
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// …
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},
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"when": "2020-05-01T18:40:00+02:00",
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"plannedWhen": "2020-05-01T18:41:00+02:00",
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"delay": -60,
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"platform": "6",
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"plannedPlatform": "6",
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"stop": {
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"type": "stop",
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"id": "8011113",
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"name": "Berlin Südkreuz",
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"location": { /* … */ },
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"products": { /* … */ },
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},
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"remarks": [ /* … */ ],
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},
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// …
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]
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```
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Note that `when` includes the `delay`, and `plannedWhen` does not.
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### 3. fetch journeys from A to B
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We call a connection from A to B – at a specific date & time, made up of sections on specific *trips* – `journey`.
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Let's fetch 2 journeys from `8011113` (*Berlin Südkreuz*) to `8010159` (*Halle (Saale)Hbf*), departing tomorrow at 2pm (at the time of writing this).
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```shell
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curl 'https://v5.db.transport.rest/journeys?from=8011113&to=8010159&departure=tomorrow+2pm&results=2' -s | jq
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```
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```js
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{
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"journeys": [{
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// 1st journey
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"type": "journey",
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"legs": [{
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// 1st leg
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"tripId": "1|310315|0|80|2052020",
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"direction": "München Hbf",
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"line": {
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"type": "line",
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"id": "ice-1601",
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"name": "ICE 1601",
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"mode": "train",
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"product": "nationalExpress",
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// …
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},
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"origin": {
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"type": "stop",
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"id": "8011113",
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"name": "Berlin Südkreuz",
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"location": { /* … */ },
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"products": { /* … */ },
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},
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"departure": "2020-05-02T14:37:00+02:00",
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"plannedDeparture": "2020-05-02T14:37:00+02:00",
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"departureDelay": null,
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"departurePlatform": "3",
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"plannedDeparturePlatform": "3"
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"destination": {
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"type": "stop",
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"id": "8010205",
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"name": "Leipzig Hbf",
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"location": { /* … */ },
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"products": { /* … */ },
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},
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"arrival": "2020-05-02T15:42:00+02:00",
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"plannedArrival": "2020-05-02T15:42:00+02:00",
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"arrivalDelay": null,
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"arrivalPlatform": "11",
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"plannedArrivalPlatform": "11",
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// …
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}, {
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// 2nd leg
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"walking": true,
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"distance": 116,
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"origin": {
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"type": "stop",
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"id": "8010205",
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"name": "Leipzig Hbf",
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"location": { /* … */ },
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"products": { /* … */ },
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},
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"departure": "2020-05-02T15:42:00+02:00",
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"plannedDeparture": "2020-05-02T15:42:00+02:00",
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"departureDelay": null,
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"destination": {
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"type": "stop",
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"id": "8098205",
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"name": "Leipzig Hbf (tief)",
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"location": { /* … */ },
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"products": { /* … */ },,
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"station": {
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"type": "station",
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"id": "8010205",
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"name": "Leipzig Hbf",
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"location": { /* … */ },
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"products": { /* … */ },
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}
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},
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"arrival": "2020-05-02T15:51:00+02:00",
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"plannedArrival": "2020-05-02T15:51:00+02:00",
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"arrivalDelay": null,
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// …
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}, {
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// 3rd leg
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"tripId": "1|334376|4|80|2052020",
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"direction": "Halle(Saale)Hbf",
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"line": {
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"type": "line",
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"id": "4-800486-5",
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"name": "S 5",
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"mode": "train",
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"product": "suburban",
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// …
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},
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"origin": {
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"type": "stop",
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"id": "8098205",
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"name": "Leipzig Hbf (tief)",
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"location": { /* … */ },
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"products": { /* … */ },,
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"station": {
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"type": "station",
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"id": "8010205",
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"name": "Leipzig Hbf",
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"location": { /* … */ },
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"products": { /* … */ },
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}
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},
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"departure": "2020-05-02T15:53:00+02:00",
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"plannedDeparture": "2020-05-02T15:53:00+02:00",
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"departureDelay": null,
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"departurePlatform": "2",
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"plannedDeparturePlatform": "2",
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"destination": {
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"type": "stop",
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"id": "8010159",
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"name": "Halle(Saale)Hbf",
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"location": { /* … */ },
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"products": { /* … */ },
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},
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"arrival": "2020-05-02T16:19:00+02:00",
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"plannedArrival": "2020-05-02T16:19:00+02:00",
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"arrivalDelay": null,
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"arrivalPlatform": "13",
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"plannedArrivalPlatform": "13",
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"cycle": {"min": 600, "max": 1800, "nr": 7},
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"alternatives": [
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{
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"tripId": "1|333647|0|80|2052020",
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"direction": "Halle(Saale)Hbf",
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"line": { /* … */ },
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"when": "2020-05-02T16:03:00+02:00",
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"plannedWhen": "2020-05-02T16:03:00+02:00",
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"delay": null,
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},
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// …
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],
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// …
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}],
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}, {
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// 2nd journey
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"type": "journey",
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"legs": [ /* … */ ],
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// …
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}],
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// …
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}
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```
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Note that `departure` includes the `departureDelay`, and `arrival` includes the `arrivalDelay`. `plannedDeparture` and `plannedArrival` do not.
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### 4. more features
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These are the basics. Check the full [API docs](api.md) for all features!
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9
docs/readme.md
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docs/readme.md
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# `v5.db.transport.rest` documentation
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[`v5.db.transport.rest`](https://v5.db.transport.rest/) is a [REST API](https://restfulapi.net).
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You can just use the API without authentication. In the future, we may [rate-limit](https://apisyouwonthate.com/blog/what-is-api-rate-limiting-all-about) your IP address if you make too many requests.
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- [Getting Started](getting-started.md)
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- [API documentation](api.md)
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- [Why this API?](why.md)
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41
docs/why.md
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docs/why.md
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@ -4,22 +4,24 @@
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## Realtime Data
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This API returns realtime data whenever its upstream, the [API for DB's mobile app](https://gist.github.com/derhuerst/2a735268bd82a0a6779633f15dceba33), provides it.
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This API returns realtime data whenever its upstream, the [API for DB's mobile app](https://github.com/public-transport/hafas-client/blob/e02a20b1de59bda3cd380445b6105e4c46036636/p/db/readme.md), provides it.
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## No API Key
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Especially on web sites/apps, it is a subpar solution to the send API keys to the client. Also, you have to obtain these keys manually and cannot automatically revoke them. **This API doesn't require a key.**
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## Sane Markup
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## CORS
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Compare the official API:
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If you want to use transport information on a web site/app, [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS) must be enabled. Otherwise, you would have to send all requests through your own proxy server. **This API has CORS enabled.**
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## Readable Markup
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Compare the underlying HAFAS API:
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```js
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{
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cid: 'C-0',
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date: '20171216',
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dur: '043200',
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chg: 2,
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sDays: { /* … */ },
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dep: {
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locX: 0,
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@ -67,7 +69,7 @@ to this one:
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subway: true,
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tram: true,
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taxi: false
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}
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},
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},
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destination: {
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type: 'station',
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@ -78,40 +80,25 @@ to this one:
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latitude: 48.150036,
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longitude: 11.461624
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},
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products: {
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nationalExp: true,
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national: true,
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regionalExp: false,
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regional: true,
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suburban: true,
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bus: true,
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ferry: false,
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subway: false,
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tram: true,
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taxi: false
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}
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products: { /* … */ },
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},
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departure: '2017-12-16T11:54:00.000+01:00',
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arrival: '2017-12-16T16:26:00.000+01:00',
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price: {
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amount: 150,
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hint: null
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}
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}
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```
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## GZIP support
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## Caching-friendly
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Especially on cellular connections, gzipped responses improve the performance a lot.
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This API sends [`ETag`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag) & [`Cache-Control`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control) headers, allowing clients to refresh their state efficiently.
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## HTTP/2
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[HTTP/2](https://http2.github.io/) allows multiple requests at a time, efficiently pipelines sequential requests and compresses headers. See [Cloudflare's HTTP/2 page](https://blog.cloudflare.com/http-2-for-web-developers/).
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## More Features
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## Proper HTTP, Proper REST
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This API enhances the functionality of their API with static data, which is used in e.g. `GET /stations`.
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This wrapper API follows [REST-ful design principles](https://restfulapi.net), it uses `GET`, and proper paths & headers.
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## Monitoring
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There's a [status board](https://status.transport.rest) that indicates the health of the API endpoints.
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There's a [status board](https://status.transport.rest) that shows realtime uptime statistics.
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7
index.js
7
index.js
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'use strict'
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const {readFileSync} = require('fs')
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const {join} = require('path')
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const createHafas = require('db-hafas')
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const createApi = require('hafas-rest-api')
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const createHealthCheck = require('hafas-client-health-check')
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@ -10,8 +8,6 @@ const pkg = require('./package.json')
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const stations = require('./routes/stations')
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const station = require('./routes/station')
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const docsAsMarkdown = readFileSync(join(__dirname, 'docs', 'index.md'), {encoding: 'utf8'})
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const hafas = createHafas(pkg.name)
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const berlinHbf = '8011160'
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@ -30,8 +26,7 @@ const config = {
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description: pkg.description,
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homepage: pkg.homepage,
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version: pkg.version,
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docsAsMarkdown,
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docsLink: '/docs',
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docsLink: 'https://github.com/derhuerst/db-rest/blob/5/docs/readme.md',
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logging: true,
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aboutPage: true,
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etags: 'strong',
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@ -36,6 +36,15 @@ npm start
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To keep the API running permanently, use tools like [`forever`](https://github.com/foreverjs/forever#forever) or [`systemd`](https://wiki.debian.org/systemd).
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## Related Projects
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- [`vbb-rest`](https://github.com/derhuerst/vbb-rest) – A clean REST API wrapping around the VBB API.
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- [`bvg-rest`](https://github.com/derhuerst/bvg-rest) – A clean REST API wrapping around the BVG API.
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- [`hvv-rest`](https://github.com/derhuerst/hvv-rest) – A clean REST API wrapping around the HVV API.
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- [`hafas-rest-api`](https://github.com/public-transport/hafas-rest-api) – Expose a HAFAS client via an HTTP REST API.
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- [`hafas-client`](https://github.com/public-transport/hafas-client) – JavaScript client for HAFAS public transport APIs.
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## Contributing
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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/db-rest/issues).
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