matrix-pretix/internal/pretix/order_placed.go

package pretix

import (
	"encoding/json"
	"fmt"
	"net/http"
	"time"

	"maunium.net/go/mautrix/event"
)

const (
	eventOrderPlaced	= "pretix.event.order.placed"

	urlIndividualOrder	= "%s/api/v1/organizers/%s/events/%s/orders/%s/"
)

func (s Server) orderPlaced(w http.ResponseWriter, r *http.Request) {
	if r.Header.Get("Content-Type") != "application/json" {
		writeStatus(w, http.StatusBadRequest)
		return
	}

	data := struct{
		Action		string
		Code		string
		Event		string
		Organizer	string
	}{}
	decoder := json.NewDecoder(r.Body)

	err := decoder.Decode(&data)
	if err != nil {
		writeStatus(w, http.StatusBadRequest)
		return
	}

	if data.Action != eventOrderPlaced {
		writeStatus(w, http.StatusBadRequest)
		return
	}

	req, err := http.NewRequest(http.MethodGet, s.buildURL(urlIndividualOrder, data.Organizer, data.Event, data.Code), nil)
	if err != nil {
		writeStatus(w, http.StatusInternalServerError)
		return
	}

	req.Header.Set("Accept", "application/json")
	req.Header.Set("Authorization", fmt.Sprint("Token ", s.config.APIToken))

	resp, err := s.client.Do(req)
	if err != nil {
		writeStatus(w, http.StatusInternalServerError)
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		writeStatus(w, http.StatusInternalServerError)
		return
	}

	if resp.Header.Get("Content-Type") != "application/json" {
		writeStatus(w, http.StatusInternalServerError)
		return
	}

	decoder = json.NewDecoder(resp.Body)
	order := struct{
		Code		string
		Datetime	time.Time
		Positions	[]struct{
			Price	string
		}
	}{}

	err = decoder.Decode(&order)
	if err != nil {
		writeStatus(w, http.StatusInternalServerError)
		return
	}

	result, err := s.db.Exec("INSERT INTO orders VALUES(?);", order.Code)
	if err != nil {
		writeStatus(w, http.StatusInternalServerError)
		return
	}

	rowsAffected, err := result.RowsAffected()
	if err != nil {
		writeStatus(w, http.StatusInternalServerError)
		return
	}

	if rowsAffected > 0 && order.Datetime.Add(72 * time.Hour).After(time.Now()) { // pretix retries failed webhooks for up to three days
		message := event.MessageEventContent{
			MsgType:	event.MsgText,
			Body:		fmt.Sprintf("%+v", order),
		}

		s.matrix.Broadcast(&message)
	}
}