~evanj/cms

ref: afc228cb59683180b3b2957aceb6bf1aa0bf0d0e cms/internal/s/stripe/stripe.go -rw-r--r-- 3.8 KiB
afc228cbEvan J Feat(db): Tweaking db.SetMaxOpenConns, db.SetMaxIdleConns, and 1 year, 20 days ago
                                                                                
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package stripe

import (
	"log"

	"git.sr.ht/~evanj/cms/internal/m/org"
	"git.sr.ht/~evanj/cms/internal/m/tier"
	"git.sr.ht/~evanj/cms/internal/m/user"
	"github.com/pkg/errors"
	lib "github.com/stripe/stripe-go/v71"
	"github.com/stripe/stripe-go/v71/checkout/session"
	"github.com/stripe/stripe-go/v71/customer"
	"github.com/stripe/stripe-go/v71/sub"
)

type Stripe struct {
	log                   *log.Logger
	sucesssURL, cancelURL string
	pk, sk                string
	db                    DBer
}

type DBer interface {
	UserGetFromToken(token string) (user.User, error)
	OrgUpdateTier(u user.User, o org.Org, t tier.Tier, paymentCustomerID string) error
}

func New(l *log.Logger, sucesssURL, cancelURL, pk, sk string, db DBer) Stripe {
	// Stripe sucks.
	lib.Key = sk
	return Stripe{
		l,
		sucesssURL, cancelURL,
		pk, sk,
		db,
	}
}

func (s Stripe) StartCheckout(user user.User, t tier.Tier) (string, string, error) {
	customerParams := &lib.CustomerParams{
		Name:        lib.String(user.Name()),
		Description: lib.String(user.Token()),
	}

	c, err := customer.New(customerParams)
	if err != nil {
		return "", "", err
	}

	// Make sure we're on free tier.
	if err := s.db.OrgUpdateTier(user, user.Org(), tier.Free, c.ID); err != nil {
		return "", "", err
	}

	params := &lib.CheckoutSessionParams{
		Customer: lib.String(c.ID),
		PaymentMethodTypes: lib.StringSlice([]string{
			"card",
		}),
		LineItems: []*lib.CheckoutSessionLineItemParams{
			&lib.CheckoutSessionLineItemParams{
				Price:    lib.String(t.StripePriceID),
				Quantity: lib.Int64(1),
			},
		},
		Mode:       lib.String("subscription"),
		SuccessURL: lib.String(s.sucesssURL),
		CancelURL:  lib.String(s.cancelURL),
	}

	sess, err := session.New(params)
	if err != nil {
		return "", "", err
	}

	return sess.ID, s.pk, nil
}

func (s Stripe) CompleteCheckout(sessionID string) error {
	sess, err := session.Get(sessionID, &lib.CheckoutSessionParams{
		PaymentIntentData: &lib.CheckoutSessionPaymentIntentDataParams{},
	})
	if err != nil {
		return errors.Wrap(err, "transaction session not found")
	}

	c, err := customer.Get(sess.Customer.ID, nil)
	if err != nil {
		return errors.Wrap(err, "customer not found")
	}
	if c.Subscriptions == nil {
		return errors.New("corrupted customer object")
	}

	// NOTE: Only one subscription can exist at once per user/org.
	var (
		t   tier.Tier
		def tier.Tier
		ok  bool
	)
	for _, sub := range c.Subscriptions.Data {
		for _, li := range sub.Items.Data {
			t, ok = tier.ByStripePriceID(li.Price.ID)
			if !ok {
				return errors.New("mangled subscription item")
			}
		}
	}

	if t.Name == def.Name {
		return errors.New("subscription could not be found")
	}

	user, err := s.db.UserGetFromToken(c.Description)
	if err != nil {
		return errors.Wrap(err, "mangled user token")
	}

	return s.db.OrgUpdateTier(user, user.Org(), t, c.ID)
}

func (s Stripe) CancelSubscription(user user.User) error {
	if !user.Org().HasPaymentCustomer() {
		return errors.New("organization has no customer")
	}

	c, err := customer.Get(user.Org().PaymentCustomerID(), nil)
	if err != nil {
		return errors.Wrap(err, "customer not found")
	}
	if c.Subscriptions == nil {
		return errors.New("corrupted customer object")
	}

	currTier := user.Org().Tier()
	if err := s.db.OrgUpdateTier(user, user.Org(), tier.Free, c.ID); err != nil {
		return err
	}

	for _, subItem := range c.Subscriptions.Data {
		_, err := sub.Cancel(subItem.ID, nil)
		if err != nil {
			if err := s.db.OrgUpdateTier(user, user.Org(), currTier, c.ID); err != nil {
				// TODO: Better way to report this to ourselves?
				s.log.Println("big error: sub update in DB but not reflected in stripe")
				return errors.Wrap(err, "your subscription has been cancelled within Skipper CMS but not our payment processor: please contact an admin")
			}
			return errors.Wrap(err, "failed to cancel subscription")
		}
	}

	return nil
}