Handlers for rpc-over-ws that verify an IAP with Apple or Google and manage a user's coin balance in Redis.

Installation

npm i --save rpc-virtual-bank

Usage

const Redis = require('ioredis')
const redis = new Redis(process.env.REDIS_URL)

const vbank = require('rpc-virtual-bank')({
  redis,
  products: {
    'com.foobar.product1': 100,
    'com.foobar.product2': 1000,
    ...
  },
  freeCoinsAmt: 100,
  freeCoinsAfter: 3600,
  upgradeRedeemCoins: 2500
})

require('rpc-over-ws')({
  getProductIds: vbank.getProductIds,
  verifyIAP: vbank.verifyIAP,
  getCoinStatus: vbank.getCoinStatus,
  collectFreeCoins: vbank.collectFreeCoins,
  didPreviouslyUpgrade: vbank.didPreviouslyUpgrade,
  debit: vbank.debit,
})

API

require('rpc-virtual-bank')(options)

  options
    redis: instance of ioredis.Redis
    products: keys are product ids; values are number of coins associated
    freeCoinsAmt: number of "free coins" to give out
    freeCoinsAfter: how long a user has to wait since the last time
      they collected free coins before they may collect free coins again

verifyIAP({ platform, receipt }) -> Promise<{ balance: int }>

getCoinStatus() -> Promise<{ balance: int, nextFreeCoinsAt: int }>

collectFreeCoins() -> Promise<{ balance: int, nextFreeCoinsAt: int }>

  Common error: 'too soon'.

debit({ amt: int }) -> Promise<{ balance: int }>

  Common error: 'out of coins'.

  A user's coin balance may not become negative.

Events

vbank.emitter.on('iap-rejected', (client, platform, receipt, error) => {
})

vbank.emitter.on('iap-verified', (client, platform, productId, coinsPurchased) => {
})

vbank.emitter.on('free-coins-collected', client => {
})

vbank.emitter.on('free-coins-error', (client, error) => {
})

vbank.emitter.on('debit', (client, amt) => {
})

vbank.emitter.on('debit-error', (client, amt, error) => {
})