355 lines
13 KiB
Go
355 lines
13 KiB
Go
package server
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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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/customer"
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"github.com/stripe/stripe-go/v74/price"
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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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"heckel.io/ntfy/log"
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"heckel.io/ntfy/user"
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"heckel.io/ntfy/util"
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"io"
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"net/http"
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"net/netip"
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"time"
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)
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var (
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errNotAPaidTier = errors.New("tier does not have billing price identifier")
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errMultipleBillingSubscriptions = errors.New("cannot have multiple billing subscriptions")
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errNoBillingSubscription = errors.New("user does not have an active billing subscription")
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)
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// handleBillingTiersGet returns all available paid tiers, and the free tier. This is to populate the upgrade dialog
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// in the UI. Note that this endpoint does NOT have a user context (no v.user!).
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func (s *Server) handleBillingTiersGet(w http.ResponseWriter, _ *http.Request, _ *visitor) error {
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tiers, err := s.userManager.Tiers()
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if err != nil {
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return err
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}
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freeTier := defaultVisitorLimits(s.config)
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response := []*apiAccountBillingTier{
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{
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// Free tier: no code, name or price
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Limits: &apiAccountLimits{
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Messages: freeTier.MessagesLimit,
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MessagesExpiryDuration: int64(freeTier.MessagesExpiryDuration.Seconds()),
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Emails: freeTier.EmailsLimit,
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Reservations: freeTier.ReservationsLimit,
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AttachmentTotalSize: freeTier.AttachmentTotalSizeLimit,
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AttachmentFileSize: freeTier.AttachmentFileSizeLimit,
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AttachmentExpiryDuration: int64(freeTier.AttachmentExpiryDuration.Seconds()),
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},
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},
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}
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prices, err := s.priceCache.Value()
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if err != nil {
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return err
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}
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for _, tier := range tiers {
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priceStr, ok := prices[tier.StripePriceID]
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if tier.StripePriceID == "" || !ok {
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continue
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}
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response = append(response, &apiAccountBillingTier{
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Code: tier.Code,
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Name: tier.Name,
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Price: priceStr,
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Limits: &apiAccountLimits{
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Messages: tier.MessagesLimit,
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MessagesExpiryDuration: int64(tier.MessagesExpiryDuration.Seconds()),
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Emails: tier.EmailsLimit,
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Reservations: tier.ReservationsLimit,
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AttachmentTotalSize: tier.AttachmentTotalSizeLimit,
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AttachmentFileSize: tier.AttachmentFileSizeLimit,
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AttachmentExpiryDuration: int64(tier.AttachmentExpiryDuration.Seconds()),
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},
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})
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}
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return s.writeJSON(w, response)
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}
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// handleAccountBillingSubscriptionCreate creates a Stripe checkout flow to create a user subscription. The tier
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// will be updated by a subsequent webhook from Stripe, once the subscription becomes active.
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func (s *Server) handleAccountBillingSubscriptionCreate(w http.ResponseWriter, r *http.Request, v *visitor) error {
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if v.user.Billing.StripeSubscriptionID != "" {
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return errHTTPBadRequestBillingSubscriptionExists
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}
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req, err := readJSONWithLimit[apiAccountBillingSubscriptionChangeRequest](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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} else if tier.StripePriceID == "" {
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return errNotAPaidTier
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}
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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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stripeCustomer, err := customer.Get(v.user.Billing.StripeCustomerID, nil)
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if err != nil {
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return err
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} else if stripeCustomer.Subscriptions != nil && len(stripeCustomer.Subscriptions.Data) > 0 {
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return errMultipleBillingSubscriptions
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}
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}
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successURL := s.config.BaseURL + apiAccountBillingSubscriptionCheckoutSuccessTemplate
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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,
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SuccessURL: &successURL,
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Mode: stripe.String(string(stripe.CheckoutSessionModeSubscription)),
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AllowPromotionCodes: stripe.Bool(true),
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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 := &apiAccountBillingSubscriptionCreateResponse{
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RedirectURL: sess.URL,
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}
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return s.writeJSON(w, response)
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}
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func (s *Server) handleAccountBillingSubscriptionCreateSuccess(w http.ResponseWriter, r *http.Request, _ *visitor) error {
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// We don't have a v.user in this endpoint, only a userManager!
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matches := apiAccountBillingSubscriptionCheckoutSuccessRegex.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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sess, err := session.Get(sessionID, nil) // FIXME how do I rate limit this?
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if err != nil {
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log.Warn("Stripe: %s", err)
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return errHTTPBadRequestBillingRequestInvalid
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} else if sess.Customer == nil || sess.Subscription == nil || sess.ClientReferenceID == "" {
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return wrapErrHTTP(errHTTPBadRequestBillingRequestInvalid, "customer or subscription not found")
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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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return wrapErrHTTP(errHTTPBadRequestBillingRequestInvalid, "more than one line item in existing subscription")
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}
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tier, err := s.userManager.TierByStripePrice(sub.Items.Data[0].Price.ID)
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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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if err := s.updateSubscriptionAndTier(u, sess.Customer.ID, sub.ID, string(sub.Status), sub.CurrentPeriodEnd, sub.CancelAt, tier.Code); err != nil {
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return err
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}
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http.Redirect(w, r, s.config.BaseURL+accountPath, http.StatusSeeOther)
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return nil
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}
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// handleAccountBillingSubscriptionUpdate updates an existing Stripe subscription to a new price, and updates
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// a user's tier accordingly. This endpoint only works if there is an existing subscription.
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func (s *Server) handleAccountBillingSubscriptionUpdate(w http.ResponseWriter, r *http.Request, v *visitor) error {
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if v.user.Billing.StripeSubscriptionID == "" {
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return errNoBillingSubscription
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}
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req, err := readJSONWithLimit[apiAccountBillingSubscriptionChangeRequest](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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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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return s.writeJSON(w, newSuccessResponse())
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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.StripeSubscriptionID != "" {
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params := &stripe.SubscriptionParams{
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CancelAtPeriodEnd: stripe.Bool(true),
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}
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_, err := subscription.Update(v.user.Billing.StripeSubscriptionID, params)
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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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return s.writeJSON(w, newSuccessResponse())
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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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return s.writeJSON(w, response)
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}
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// handleAccountBillingWebhook handles incoming Stripe webhooks. It mainly keeps the local user database in sync
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// with the Stripe view of the world. This endpoint is authorized via the Stripe webhook secret. Note that the
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// visitor (v) in this endpoint is the Stripe API, so we don't have v.user available.
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func (s *Server) handleAccountBillingWebhook(w http.ResponseWriter, r *http.Request, _ *visitor) error {
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stripeSignature := r.Header.Get("Stripe-Signature")
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if stripeSignature == "" {
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return errHTTPBadRequestBillingRequestInvalid
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}
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body, err := util.Peek(r.Body, jsonBodyBytesLimit)
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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 errHTTPBadRequestBillingRequestInvalid
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} else if event.Data == nil || event.Data.Raw == nil {
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return errHTTPBadRequestBillingRequestInvalid
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}
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log.Info("Stripe: webhook event %s received", event.Type)
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switch event.Type {
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case "customer.subscription.updated":
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return s.handleAccountBillingWebhookSubscriptionUpdated(event.Data.Raw)
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case "customer.subscription.deleted":
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return s.handleAccountBillingWebhookSubscriptionDeleted(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(event json.RawMessage) error {
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r, err := util.UnmarshalJSON[apiStripeSubscriptionUpdatedEvent](io.NopCloser(bytes.NewReader(event)))
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if err != nil {
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return err
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} else if r.ID == "" || r.Customer == "" || r.Status == "" || r.CurrentPeriodEnd == 0 || r.Items == nil || len(r.Items.Data) != 1 || r.Items.Data[0].Price == nil || r.Items.Data[0].Price.ID == "" {
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return errHTTPBadRequestBillingRequestInvalid
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}
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subscriptionID, priceID := r.ID, r.Items.Data[0].Price.ID
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log.Info("Stripe: customer %s: Updating subscription to status %s, with price %s", r.Customer, r.Status, priceID)
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u, err := s.userManager.UserByStripeCustomer(r.Customer)
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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)
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if err != nil {
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return err
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}
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if err := s.updateSubscriptionAndTier(u, r.Customer, subscriptionID, r.Status, r.CurrentPeriodEnd, r.CancelAt, tier.Code); err != nil {
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return err
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}
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s.publishSyncEventAsync(s.visitorFromUser(u, netip.IPv4Unspecified()))
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return nil
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}
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func (s *Server) handleAccountBillingWebhookSubscriptionDeleted(event json.RawMessage) error {
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r, err := util.UnmarshalJSON[apiStripeSubscriptionDeletedEvent](io.NopCloser(bytes.NewReader(event)))
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if err != nil {
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return err
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} else if r.Customer == "" {
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return errHTTPBadRequestBillingRequestInvalid
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}
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log.Info("Stripe: customer %s: subscription deleted, downgrading to unpaid tier", r.Customer)
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u, err := s.userManager.UserByStripeCustomer(r.Customer)
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if err != nil {
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return err
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}
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if err := s.updateSubscriptionAndTier(u, r.Customer, "", "", 0, 0, ""); err != nil {
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return err
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}
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s.publishSyncEventAsync(s.visitorFromUser(u, netip.IPv4Unspecified()))
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return nil
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}
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func (s *Server) updateSubscriptionAndTier(u *user.User, customerID, subscriptionID, status string, paidUntil, cancelAt int64, tier string) error {
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u.Billing.StripeCustomerID = customerID
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u.Billing.StripeSubscriptionID = subscriptionID
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u.Billing.StripeSubscriptionStatus = stripe.SubscriptionStatus(status)
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u.Billing.StripeSubscriptionPaidUntil = time.Unix(paidUntil, 0)
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u.Billing.StripeSubscriptionCancelAt = time.Unix(cancelAt, 0)
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if tier == "" {
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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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} else {
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if err := s.userManager.ChangeTier(u.Name, tier); err != nil {
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return err
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}
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}
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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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// fetchStripePrices contacts the Stripe API to retrieve all prices. This is used by the server to cache the prices
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// in memory, and ultimately for the web app to display the price table.
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func fetchStripePrices() (map[string]string, error) {
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log.Debug("Caching prices from Stripe API")
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prices := make(map[string]string)
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iter := price.List(&stripe.PriceListParams{
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Active: stripe.Bool(true),
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})
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for iter.Next() {
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p := iter.Price()
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if p.UnitAmount%100 == 0 {
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prices[p.ID] = fmt.Sprintf("$%d", p.UnitAmount/100)
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} else {
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prices[p.ID] = fmt.Sprintf("$%.2f", float64(p.UnitAmount)/100)
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}
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log.Trace("- Caching price %s = %v", p.ID, prices[p.ID])
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}
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if iter.Err() != nil {
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log.Warn("Fetching Stripe prices failed: %s", iter.Err().Error())
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return nil, iter.Err()
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}
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return prices, nil
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}
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