Added Bitcoin to ISK endpoint

endpoints/btc/documentation.md

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+# Bitcoin to ISK price
+
+Source [Myntkaup.is](https://myntkaup.is)
+
+-  GET [/btc](https://apis.is/btc)
+
+Current Bitcoin to ISK exchange rate.
+
+---

endpoints/btc/index.js

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+const request = require('request')
+const app = require('../../server')
+
+// set cache time to 1 minute
+const cacheTime = 60
+
+function queryGzipJson(url, callback) {
+  const headers = {
+    'user-agent': 'apis.is',
+  }
+  request.get({
+    headers,
+    url,
+    gzip: true,
+    json: true,
+  }, (error, response, data) => {
+    if (error || response.statusCode !== 200) {
+      callback(error, response, null)
+    }
+    callback(error, response, data)
+  })
+}
+
+function queryRate(callback) {
+  queryGzipJson('https://myntkaup.is/api/assets/bitcoin', callback)
+}
+
+function standardErrorResponse(res) {
+  return res.status(500).json({
+    error: 'myntkaup.is refuses to respond or give back data',
+  })
+}
+
+app.get('/btc', (req, res) => {
+  queryRate((error, response, data) => {
+    if (error || response.statusCode !== 200) {
+      return standardErrorResponse(res)
+    }
+    return res.cache(cacheTime).json(data)
+  })
+})

endpoints/btc/tests/integration_test.js

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+/* eslint-disable no-bitwise */
+/* eslint-disable import/first */
+/* eslint-disable import/extensions */
+const request = require('request')
+const helpers = require('../../../lib/test_helpers.js')
+
+describe('btc', function () {
+  this.timeout(20000)
+  const rateTypes = {
+    id: String,
+    symbol: String,
+    currencySymbol: String,
+    rateUsd: Number,
+    rateIsk: Number,
+    rateIskFriendly: String
+  }
+  const statsFields = Object.keys(rateTypes)
+  it('should return object containing specific fields with correct types', (done) => {
+    const params = helpers.testRequestParams('/btc')
+    request.get(params, (err, res, body) => {
+      if (err) throw err
+      let json
+      try {
+        json = JSON.parse(body)
+      } catch (e) {
+        throw e
+      }
+      helpers.assertPresenceOfFields(statsFields, [json])
+      helpers.assertTypesOfFields(rateTypes, [json])
+      done()
+    })
+  })
+})