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Payment stuff, cont'd
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binwiederhier
parent
f7f7f469ad
commit
c06bfb989e
11 changed files with 457 additions and 309 deletions
server
287
server/server_payments.go
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287
server/server_payments.go
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@ -0,0 +1,287 @@
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package server
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import (
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"encoding/json"
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"errors"
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"github.com/stripe/stripe-go/v74"
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portalsession "github.com/stripe/stripe-go/v74/billingportal/session"
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"github.com/stripe/stripe-go/v74/checkout/session"
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"github.com/stripe/stripe-go/v74/subscription"
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"github.com/stripe/stripe-go/v74/webhook"
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"github.com/tidwall/gjson"
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"heckel.io/ntfy/log"
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"heckel.io/ntfy/user"
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"heckel.io/ntfy/util"
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"net/http"
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"time"
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)
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const (
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stripeBodyBytesLimit = 16384
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)
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// handleAccountBillingSubscriptionChange facilitates all subscription/tier changes, including payment flows.
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//
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// FIXME this should be two functions!
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//
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// It handles two cases:
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// - Create subscription: Transition from a user without Stripe subscription to a paid subscription (Checkout flow)
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// - Change subscription: Switching between Stripe prices (& tiers) by changing the Stripe subscription
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func (s *Server) handleAccountBillingSubscriptionChange(w http.ResponseWriter, r *http.Request, v *visitor) error {
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req, err := readJSONWithLimit[apiAccountTierChangeRequest](r.Body, jsonBodyBytesLimit)
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if err != nil {
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return err
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}
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tier, err := s.userManager.Tier(req.Tier)
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if err != nil {
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return err
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}
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if v.user.Billing.StripeSubscriptionID == "" && tier.StripePriceID != "" {
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return s.handleAccountBillingSubscriptionAdd(w, v, tier)
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} else if v.user.Billing.StripeSubscriptionID != "" {
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return s.handleAccountBillingSubscriptionUpdate(w, v, tier)
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}
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return errors.New("invalid state")
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}
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// handleAccountBillingSubscriptionDelete facilitates downgrading a paid user to a tier-less user,
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// and cancelling the Stripe subscription entirely
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func (s *Server) handleAccountBillingSubscriptionDelete(w http.ResponseWriter, r *http.Request, v *visitor) error {
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if v.user.Billing.StripeCustomerID == "" {
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return errHTTPBadRequestNotAPaidUser
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}
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if v.user.Billing.StripeSubscriptionID != "" {
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_, err := subscription.Cancel(v.user.Billing.StripeSubscriptionID, nil)
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if err != nil {
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return err
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}
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}
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if err := s.userManager.ResetTier(v.user.Name); err != nil {
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return err
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}
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v.user.Billing.StripeSubscriptionID = ""
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v.user.Billing.StripeSubscriptionStatus = ""
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v.user.Billing.StripeSubscriptionPaidUntil = time.Unix(0, 0)
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if err := s.userManager.ChangeBilling(v.user); err != nil {
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return err
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}
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return nil
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}
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func (s *Server) handleAccountBillingSubscriptionAdd(w http.ResponseWriter, v *visitor, tier *user.Tier) error {
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log.Info("Stripe: No existing subscription, creating checkout flow")
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var stripeCustomerID *string
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if v.user.Billing.StripeCustomerID != "" {
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stripeCustomerID = &v.user.Billing.StripeCustomerID
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}
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successURL := s.config.BaseURL + accountBillingSubscriptionCheckoutSuccessTemplate
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params := &stripe.CheckoutSessionParams{
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Customer: stripeCustomerID, // A user may have previously deleted their subscription
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ClientReferenceID: &v.user.Name, // FIXME Should be user ID
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SuccessURL: &successURL,
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Mode: stripe.String(string(stripe.CheckoutSessionModeSubscription)),
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LineItems: []*stripe.CheckoutSessionLineItemParams{
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{
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Price: stripe.String(tier.StripePriceID),
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Quantity: stripe.Int64(1),
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},
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},
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/*AutomaticTax: &stripe.CheckoutSessionAutomaticTaxParams{
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Enabled: stripe.Bool(true),
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},*/
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}
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sess, err := session.New(params)
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if err != nil {
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return err
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}
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response := &apiAccountCheckoutResponse{
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RedirectURL: sess.URL,
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}
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Access-Control-Allow-Origin", "*") // FIXME remove this
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if err := json.NewEncoder(w).Encode(response); err != nil {
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return err
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}
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return nil
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}
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func (s *Server) handleAccountBillingSubscriptionUpdate(w http.ResponseWriter, v *visitor, tier *user.Tier) error {
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log.Info("Stripe: Changing tier and subscription to %s", tier.Code)
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sub, err := subscription.Get(v.user.Billing.StripeSubscriptionID, nil)
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if err != nil {
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return err
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}
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params := &stripe.SubscriptionParams{
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CancelAtPeriodEnd: stripe.Bool(false),
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ProrationBehavior: stripe.String(string(stripe.SubscriptionSchedulePhaseProrationBehaviorCreateProrations)),
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Items: []*stripe.SubscriptionItemsParams{
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{
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ID: stripe.String(sub.Items.Data[0].ID),
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Price: stripe.String(tier.StripePriceID),
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},
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},
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}
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_, err = subscription.Update(sub.ID, params)
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if err != nil {
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return err
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}
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response := &apiAccountCheckoutResponse{}
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Access-Control-Allow-Origin", "*") // FIXME remove this
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if err := json.NewEncoder(w).Encode(response); err != nil {
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return err
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}
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return nil
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}
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func (s *Server) handleAccountCheckoutSessionSuccessGet(w http.ResponseWriter, r *http.Request, v *visitor) error {
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// We don't have a v.user in this endpoint, only a userManager!
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matches := accountBillingSubscriptionCheckoutSuccessRegex.FindStringSubmatch(r.URL.Path)
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if len(matches) != 2 {
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return errHTTPInternalErrorInvalidPath
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}
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sessionID := matches[1]
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// FIXME how do I rate limit this?
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sess, err := session.Get(sessionID, nil)
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if err != nil {
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log.Warn("Stripe: %s", err)
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return errHTTPBadRequestInvalidStripeRequest
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} else if sess.Customer == nil || sess.Subscription == nil || sess.ClientReferenceID == "" {
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log.Warn("Stripe: Unexpected session, customer or subscription not found")
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return errHTTPBadRequestInvalidStripeRequest
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}
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sub, err := subscription.Get(sess.Subscription.ID, nil)
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if err != nil {
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return err
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} else if sub.Items == nil || len(sub.Items.Data) != 1 || sub.Items.Data[0].Price == nil {
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log.Error("Stripe: Unexpected subscription, expected exactly one line item")
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return errHTTPBadRequestInvalidStripeRequest
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}
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priceID := sub.Items.Data[0].Price.ID
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tier, err := s.userManager.TierByStripePrice(priceID)
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if err != nil {
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return err
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}
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u, err := s.userManager.User(sess.ClientReferenceID)
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if err != nil {
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return err
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}
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u.Billing.StripeCustomerID = sess.Customer.ID
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u.Billing.StripeSubscriptionID = sub.ID
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u.Billing.StripeSubscriptionStatus = sub.Status
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u.Billing.StripeSubscriptionPaidUntil = time.Unix(sub.CurrentPeriodEnd, 0)
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if err := s.userManager.ChangeBilling(u); err != nil {
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return err
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}
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if err := s.userManager.ChangeTier(u.Name, tier.Code); err != nil {
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return err
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}
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accountURL := s.config.BaseURL + "/account" // FIXME
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http.Redirect(w, r, accountURL, http.StatusSeeOther)
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return nil
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}
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func (s *Server) handleAccountBillingPortalSessionCreate(w http.ResponseWriter, r *http.Request, v *visitor) error {
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if v.user.Billing.StripeCustomerID == "" {
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return errHTTPBadRequestNotAPaidUser
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}
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params := &stripe.BillingPortalSessionParams{
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Customer: stripe.String(v.user.Billing.StripeCustomerID),
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ReturnURL: stripe.String(s.config.BaseURL),
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}
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ps, err := portalsession.New(params)
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if err != nil {
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return err
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}
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response := &apiAccountBillingPortalRedirectResponse{
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RedirectURL: ps.URL,
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}
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Access-Control-Allow-Origin", "*") // FIXME remove this
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if err := json.NewEncoder(w).Encode(response); err != nil {
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return err
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}
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return nil
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}
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func (s *Server) handleAccountBillingWebhook(w http.ResponseWriter, r *http.Request, v *visitor) error {
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// We don't have a v.user in this endpoint, only a userManager!
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stripeSignature := r.Header.Get("Stripe-Signature")
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if stripeSignature == "" {
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return errHTTPBadRequestInvalidStripeRequest
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}
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body, err := util.Peek(r.Body, stripeBodyBytesLimit)
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if err != nil {
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return err
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} else if body.LimitReached {
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return errHTTPEntityTooLargeJSONBody
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}
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event, err := webhook.ConstructEvent(body.PeekedBytes, stripeSignature, s.config.StripeWebhookKey)
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if err != nil {
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return errHTTPBadRequestInvalidStripeRequest
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} else if event.Data == nil || event.Data.Raw == nil {
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return errHTTPBadRequestInvalidStripeRequest
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}
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log.Info("Stripe: webhook event %s received", event.Type)
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stripeCustomerID := gjson.GetBytes(event.Data.Raw, "customer")
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if !stripeCustomerID.Exists() {
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return errHTTPBadRequestInvalidStripeRequest
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}
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switch event.Type {
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case "customer.subscription.updated":
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return s.handleAccountBillingWebhookSubscriptionUpdated(stripeCustomerID.String(), event.Data.Raw)
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case "customer.subscription.deleted":
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return s.handleAccountBillingWebhookSubscriptionDeleted(stripeCustomerID.String(), event.Data.Raw)
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default:
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return nil
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}
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}
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func (s *Server) handleAccountBillingWebhookSubscriptionUpdated(stripeCustomerID string, event json.RawMessage) error {
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status := gjson.GetBytes(event, "status")
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currentPeriodEnd := gjson.GetBytes(event, "current_period_end")
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priceID := gjson.GetBytes(event, "items.data.0.price.id")
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if !status.Exists() || !currentPeriodEnd.Exists() || !priceID.Exists() {
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return errHTTPBadRequestInvalidStripeRequest
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}
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log.Info("Stripe: customer %s: subscription updated to %s, with price %s", stripeCustomerID, status, priceID)
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u, err := s.userManager.UserByStripeCustomer(stripeCustomerID)
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if err != nil {
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return err
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}
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tier, err := s.userManager.TierByStripePrice(priceID.String())
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if err != nil {
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return err
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}
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if err := s.userManager.ChangeTier(u.Name, tier.Code); err != nil {
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return err
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}
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u.Billing.StripeSubscriptionStatus = stripe.SubscriptionStatus(status.String())
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u.Billing.StripeSubscriptionPaidUntil = time.Unix(currentPeriodEnd.Int(), 0)
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if err := s.userManager.ChangeBilling(u); err != nil {
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return err
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}
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return nil
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}
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func (s *Server) handleAccountBillingWebhookSubscriptionDeleted(stripeCustomerID string, event json.RawMessage) error {
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status := gjson.GetBytes(event, "status")
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if !status.Exists() {
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return errHTTPBadRequestInvalidStripeRequest
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}
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log.Info("Stripe: customer %s: subscription deleted, downgrading to unpaid tier", stripeCustomerID)
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u, err := s.userManager.UserByStripeCustomer(stripeCustomerID)
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if err != nil {
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return err
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}
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if err := s.userManager.ResetTier(u.Name); err != nil {
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return err
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}
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u.Billing.StripeSubscriptionID = ""
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u.Billing.StripeSubscriptionStatus = ""
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u.Billing.StripeSubscriptionPaidUntil = time.Unix(0, 0)
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if err := s.userManager.ChangeBilling(u); err != nil {
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return err
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}
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return nil
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}
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