NodeJS source (edit on github)

If you see a problem with the source submit a pull request on Github.

const subscriptions = require('../../../../../index.js')
const stripeCache = require('../../../../stripe-cache.js')

module.exports = {
  post: async (req) => {
    if (!req.query || !req.query.subscriptionid) {
      throw new Error('invalid-subscriptionid')
    }
    const subscription = await global.api.administrator.subscriptions.Subscription.get(req)
    if (!subscription) {
      throw new Error('invalid-subscriptionid')
    }
    req.query.invoiceid = subscription.latest_invoice
    const invoice = await global.api.administrator.subscriptions.Invoice.get(req)
    if (!invoice.charge) {
      throw new Error('invalid-subscription')
    }
    if ((subscription.status !== 'active' && subscription.status !== 'trialing') || subscription.cancel_at_period_end) {
      throw new Error('invalid-subscription')
    }
    req.query.chargeid = invoice.charge
    const charge = await global.api.administrator.subscriptions.Charge.get(req)
    if (!charge) {
      throw new Error('invalid-subscription')
    }
    const zeroed = []
    for (const item of subscription.items.data) {
      zeroed.push({ id: item.id, quantity: 0 })
    }
    const upcoming = await stripeCache.execute('invoices', 'retrieveUpcoming', {
      customer: subscription.customer.id || subscription.customer,
      subscription: req.query.subscriptionid,
      subscription_items: zeroed
    }, req.stripeKey)
    if (upcoming.total === 0) {
      throw new Error('invalid-subscription')
    }
    const refundInfo = {
      charge: invoice.charge,
      amount: -upcoming.total,
      reason: 'requested_by_customer',
      metadata: {
        appid: req.appid,
        accountid: req.account.accountid
      }
    }
    const refund = await stripeCache.execute('refunds', 'create', refundInfo, req.stripeKey)
    await stripeCache.update(refund)
    await subscriptions.StorageList.addMany({
      [`${req.appid}/refunds`]: refund.id,
      [`${req.appid}/paymentMethod/refunds/${charge.payment_method}`]: refund.id,
      [`${req.appid}/customer/refunds/${subscription.customer.id || subscription.customer}`]: refund.id,
      [`${req.appid}/plan/refunds/${subscription.plan.id}`]: refund.id,
      [`${req.appid}/product/refunds/${subscription.plan.product}`]: refund.id,
      [`${req.appid}/account/refunds/${req.account.accountid}`]: refund.id
    })
    return refund
  }
}

Test source (edit on github)

Tests perform real HTTP requests against a running Dashboard server.

/* eslint-env mocha */
const assert = require('assert')
const TestHelper = require('../../../../../test-helper.js')
const TestStripeAccounts = require('../../../../../test-stripe-accounts.js')

describe('/api/administrator/subscriptions/create-cancelation-refund', function () {
  this.timeout(60 * 60 * 1000)
  before(TestHelper.setupWebhook)
  after(TestHelper.deleteOldWebhooks)
  describe('exceptions', () => {
    describe('invalid-subscriptionid', () => {
      it('missing querystring subscriptionid', async () => {
        const administrator = await TestHelper.createOwner()
        const req = TestHelper.createRequest('/api/administrator/subscriptions/create-cancelation-refund')
        req.account = administrator.account
        req.session = administrator.session
        req.body = {
          refund: 'at_period_end'
        }
        let errorMessage
        try {
          await req.post()
        } catch (error) {
          errorMessage = error.message
        }
        assert.strictEqual(errorMessage, 'invalid-subscriptionid')
      })

      it('invalid querystring subscriptionid', async () => {
        const administrator = await TestHelper.createOwner()
        const req = TestHelper.createRequest('/api/administrator/subscriptions/create-cancelation-refund?subscriptionid=invalid')
        req.account = administrator.account
        req.session = administrator.session
        let errorMessage
        try {
          await req.post()
        } catch (error) {
          errorMessage = error.message
        }
        assert.strictEqual(errorMessage, 'invalid-subscriptionid')
      })
    })

    describe('invalid-subscription', () => {
      it('ineligible querystring subscription is not active', async () => {
        const administrator = await TestHelper.createOwner()
        await TestHelper.createProduct(administrator, {
          published: 'true'
        })
        await TestHelper.createPlan(administrator, {
          productid: administrator.product.id,
          usage_type: 'licensed',
          published: 'true',
          amount: '10000',
          trial_period_days: '0'
        })
        const user = await TestStripeAccounts.createUserWithPaymentMethod()
        await TestHelper.createSubscription(user, administrator.plan.id)
        await TestHelper.cancelSubscription(user)
        const req = TestHelper.createRequest(`/api/administrator/subscriptions/create-cancelation-refund?subscriptionid=${user.subscription.id}`)
        req.account = administrator.account
        req.session = administrator.session
        let errorMessage
        try {
          await req.post()
        } catch (error) {
          errorMessage = error.message
        }
        assert.strictEqual(errorMessage, 'invalid-subscription')
      })
    })
  })

  describe('returns', () => {
    it('object', async () => {
      const administrator = await TestStripeAccounts.createOwnerWithPlan()
      const user = await TestStripeAccounts.createUserWithPaymentMethod()
      await TestHelper.createSubscription(user, administrator.plan.id)
      const req = TestHelper.createRequest(`/api/administrator/subscriptions/create-cancelation-refund?subscriptionid=${user.subscription.id}`)
      req.account = administrator.account
      req.session = administrator.session
      req.body = {
        refund: 'credit'
      }
      req.filename = __filename
      req.saveResponse = true
      const refund = await req.post()
      assert.strictEqual(refund.object, 'refund')
    })
  })
})