bitcoinjs-lib/test/integration/_blockchain.js

var async = require('async')
var Blockchain = require('cb-http-client')
var httpify = require('httpify')

var BLOCKTRAIL_API_KEY = process.env.BLOCKTRAIL_API_KEY || 'c0bd8155c66e3fb148bb1664adc1e4dacd872548'

var mainnet = new Blockchain('https://api.blocktrail.com/cb/v0.2.1/BTC', { api_key: BLOCKTRAIL_API_KEY })
var testnet = new Blockchain('https://api.blocktrail.com/cb/v0.2.1/tBTC', { api_key: BLOCKTRAIL_API_KEY })

testnet.faucet = function faucet (address, amount, done) {
  httpify({
    method: 'POST',
    url: 'https://api.blocktrail.com/v1/tBTC/faucet/withdrawl?api_key=' + BLOCKTRAIL_API_KEY,
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      address: address,
      amount: amount
    })
  }, function (err, result) {
    if (err) return done(err)

    if (result.body.code === 401) {
      return done(new Error('Hit faucet rate limit; ' + result.body.msg))
    }

    // allow for TX to be processed
    async.retry(5, function (callback) {
      setTimeout(function () {
        testnet.addresses.unspents(address, function (err, result) {
          if (err) return callback(err)

          var unspent = result.filter(function (unspent) {
            return unspent.value >= amount
          }).pop()

          if (!unspent) return callback(new Error('No unspent given'))
          callback(null, unspent)
        })
      }, 600)
    }, done)
  })
}

module.exports = {
  m: mainnet,
  t: testnet
}