mirror of
https://github.com/Luzifer/twitch-bot.git
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122 lines
3.7 KiB
Go
122 lines
3.7 KiB
Go
// Package kofi contains a webhook listener to be used in the Ko-fi
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// API to receive information about (recurring) donations / shop orders
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package kofi
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import (
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"crypto/sha256"
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"encoding/json"
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"fmt"
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"net/http"
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"strings"
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"github.com/Luzifer/twitch-bot/v3/plugins"
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"github.com/gorilla/mux"
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"github.com/sirupsen/logrus"
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)
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const actorName = "kofi"
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var (
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eventCreatorFunc plugins.EventHandlerFunc
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getModuleConfig plugins.ModuleConfigGetterFunc
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ptrStringEmpty = func(s string) *string { return &s }("")
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)
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// Register provides the plugins.RegisterFunc
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func Register(args plugins.RegistrationArguments) (err error) {
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eventCreatorFunc = args.CreateEvent
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getModuleConfig = args.GetModuleConfigForChannel
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if err = args.RegisterAPIRoute(plugins.HTTPRouteRegistrationArgs{
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Description: "Endpoint to handle Ko-fi Webhook posts",
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HandlerFunc: handleKoFiPost,
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Method: http.MethodPost,
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Module: actorName,
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Name: "Handle Ko-fi Webhook",
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Path: "/webhook/{channel}",
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ResponseType: plugins.HTTPRouteResponseTypeJSON,
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RouteParams: []plugins.HTTPRouteParamDocumentation{
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{
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Description: "Channel to create the event in",
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Name: "channel",
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},
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},
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}); err != nil {
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return fmt.Errorf("registering API route: %w", err)
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}
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return nil
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}
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func handleKoFiPost(w http.ResponseWriter, r *http.Request) {
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channel := mux.Vars(r)["channel"]
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channelModuleConf := getModuleConfig(actorName, channel)
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// The data is sent (posted) with a content type of application/x-www-form-urlencoded.
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// A field named 'data' contains the payment information as a JSON string.
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jsonData := r.FormValue("data")
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if jsonData == "" {
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// Well, no.
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logrus.WithField("remote_addr", r.RemoteAddr).Warn("received KoFi hook without payload")
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http.Error(w, "you missed something", http.StatusBadRequest)
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return
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}
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var (
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err error
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payload hookPayload
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)
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// Read the payload
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if err = json.Unmarshal([]byte(jsonData), &payload); err != nil {
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logrus.WithError(err).Error("unmarshalling KoFi JSON data")
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http.Error(w, "that's not valid json, you know", http.StatusBadRequest)
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return
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}
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// If we know the verification token, validate the payload
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if validateToken := channelModuleConf.MustString("verification_token", ptrStringEmpty); validateToken != "" && payload.VerificationToken != validateToken {
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logrus.WithFields(logrus.Fields{
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"expected": fmt.Sprintf("sha256:%x", sha256.Sum256([]byte(validateToken))),
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"provided": fmt.Sprintf("sha256:%x", sha256.Sum256([]byte(payload.VerificationToken))),
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}).Error("received Ko-fi payload with invalid verification token")
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http.Error(w, "ehm, who are you?", http.StatusForbidden)
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return
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}
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fields := plugins.NewFieldCollection()
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fields.Set("channel", "#"+strings.TrimLeft(channel, "#"))
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switch payload.Type {
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case hookTypeDonation, hookTypeSubscription:
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// Single or Recurring Donation
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fields.Set("from", payload.FromName)
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fields.Set("amount", payload.Amount)
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fields.Set("currency", payload.Currency)
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fields.Set("isSubscription", payload.IsSubscriptionPayment)
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fields.Set("isFirstSubPayment", payload.IsFirstSubscriptionPayment)
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if payload.IsPublic {
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fields.Set("message", payload.Message)
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}
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if payload.IsSubscriptionPayment && payload.TierName != nil {
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fields.Set("tier", *payload.TierName)
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}
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if err = eventCreatorFunc("kofi_donation", fields); err != nil {
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logrus.WithError(err).Error("creating kofi_donation event")
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http.Error(w, "ehm, that didn't work, I'm sorry", http.StatusInternalServerError)
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return
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}
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default:
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// Unsupported, we take that and discard it
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logrus.WithField("type", payload.Type).Warn("received unhandled hook type")
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}
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w.WriteHeader(http.StatusOK)
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}
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