Implement order placed webhook

internal/config/config.go

@@ -26,6 +26,8 @@ type MatrixConfig struct {
 }
 
 type ServerConfig struct {
+	APIToken	string	`json:"api_token"`
+	BaseURL		string	`json:"base_url"`
 	ListenAddress	string	`json:"listen_address"`
 }
 

internal/pretix/order_placed.go

@@ -0,0 +1,98 @@
+package pretix
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+)
+
+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
+		log.Print(order)
+	}
+}

internal/pretix/server.go

@@ -2,10 +2,12 @@ package pretix
 
 import (
 	"context"
-	"encoding/json"
+	"database/sql"
+	"fmt"
 	"io"
 	"log"
 	"net/http"
+	"strings"
 	"sync"
 
 	"git.luj0ga.de/franconian/matrix-pretix/internal/config"
@@ -14,21 +16,30 @@ import (
 
 type Server struct {
 	client	http.Client
+	config	*config.ServerConfig
+	db	*sql.DB
 	matrix	*matrix.Client
 }
 
-func NewServer(matrix *matrix.Client) *Server {
+func NewServer(config *config.ServerConfig, db *sql.DB, matrix *matrix.Client) *Server {
 	return &Server{
+		config: config,
+		db:	db,
 		matrix: matrix,
 	}
 }
 
-func (s Server) ListenAndServe(config *config.ServerConfig, ctx context.Context, wg *sync.WaitGroup) error {
+func (s Server) ListenAndServe(ctx context.Context, wg *sync.WaitGroup) error {
+	err := s.createTables()
+	if err != nil {
+		return err
+	}
+
 	http.HandleFunc("/", http.NotFound)
 	http.HandleFunc("/order_placed", s.orderPlaced)
 
 	server := http.Server{
-		Addr:	config.ListenAddress,
+		Addr:	s.config.ListenAddress,
 	}
 
 	go func() {
@@ -43,9 +54,9 @@ func (s Server) ListenAndServe(config *config.ServerConfig, ctx context.Context,
 		}
 	}()
 
-	log.Print("listening on ", config.ListenAddress)
+	log.Print("listening on ", s.config.ListenAddress)
 
-	err := server.ListenAndServe()
+	err = server.ListenAndServe()
 	if err != http.ErrServerClosed {
 		return err
 	}
@@ -53,22 +64,41 @@ func (s Server) ListenAndServe(config *config.ServerConfig, ctx context.Context,
 	return nil
 }
 
-func (s Server) orderPlaced(w http.ResponseWriter, r *http.Request) {
+func (s Server) createTables() error {
-	if r.Header.Get("Content-Type") != "application/json" {
+	tables := []string{
-		writeStatus(w, http.StatusBadRequest)
+		`CREATE TABLE IF NOT EXISTS orders (
-		return
+			code	TEXT	PRIMARY KEY ON CONFLICT IGNORE
+		);
+		`,
 	}
 
-	decoder := json.NewDecoder(r.Body)
+	tx, err := s.db.Begin()
-
-	var data map[string]interface{}
-	err := decoder.Decode(&data)
 	if err != nil {
-		writeStatus(w, http.StatusBadRequest)
+		return err
-		return
 	}
 
-	log.Print(data)
+	for _, table := range tables {
+		_, err := tx.Exec(table)
+		if err != nil {
+			if err := tx.Rollback(); err != nil {
+				log.Print(err)
+			}
+
+			return err
+		}
+	}
+
+	err = tx.Commit()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s Server) buildURL(endpoint string, args ...any) string {
+	baseURL := strings.TrimSuffix(s.config.BaseURL, "/")
+	return fmt.Sprintf(endpoint, append([]any{baseURL}, args...)...)
 }
 
 func writeStatus(w http.ResponseWriter, code int) {

main.go

@@ -60,9 +60,9 @@ func main() {
 
 	go client.Sync(ctx, &wg)
 
-	server := pretix.NewServer(client)
+	server := pretix.NewServer(&config.Server, db, client)
 
-	err = server.ListenAndServe(&config.Server, ctx, &wg)
+	err = server.ListenAndServe(ctx, &wg)
 	if err != nil {
 		stop()
 		wg.Wait()