ability to fetch data

index.js

@@ -1,3 +1,30 @@
 'use strict'
 
-// todo
+const got = require('got')
+
+const request = (cfg) => (data) => {
+	let req = {
+		json: true,
+		headers: {
+			'Content-Type':    'application/json',
+			'Accept-Encoding': 'gzip, deflate'
+		},
+		body: JSON.stringify({
+			  client: cfg.client, ext: cfg.ext
+			, ver: cfg.version, auth: cfg.auth
+			, lang: 'en', svcReqL: [data]
+		})
+	}
+	if (cfg.req) req = cfg.req(req)
+
+	return got.post(cfg.endpoint, req)
+	.then((res) => {
+		if (res.body.err) return new Error(res.body.err)
+		if (!res.body.svcResL || !res.body.svcResL[0]) return new Error('invalid response')
+		const data = res.body.svcResL[0]
+		if (data.err !== 'OK') return new Error(data.errTxt)
+		return data.res
+	}).catch(console.error)
+}
+
+module.exports = request

package.json

@@ -10,5 +10,8 @@
 	"bugs":         "https://github.com/derhuerst/hafas-client/issues",
 	"license":      "ISC",
 	"keywords":     ["hafas", "public", "transport", "api"],
-	"engines" :     {"node": ">=4"}
+	"engines" :     {"node": ">=4"},
+	"dependencies": {
+		"got": "^6.3"
+	}
 }