init

backend/internal/gifts/handler.go

@@ -0,0 +1,73 @@
+package gifts
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strings"
+)
+
+type Handler struct {
+	service *Service
+}
+
+func NewHandler(service *Service) *Handler {
+	return &Handler{service: service}
+}
+
+func (h *Handler) Routes() http.Handler {
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /health", h.Health)
+	mux.HandleFunc("GET /api/gifts/{slug}", h.GetGift)
+	return mux
+}
+
+func (h *Handler) Health(w http.ResponseWriter, _ *http.Request) {
+	writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+}
+
+func (h *Handler) GetGift(w http.ResponseWriter, r *http.Request) {
+	slug := strings.TrimSpace(r.PathValue("slug"))
+	if !validSlug(slug) {
+		writeError(w, http.StatusBadRequest, "invalid gift slug")
+		return
+	}
+
+	gift, err := h.service.GetPublicGift(r.Context(), slug)
+	if err != nil {
+		if errors.Is(err, ErrNotFound) {
+			writeError(w, http.StatusNotFound, "gift not found")
+			return
+		}
+		writeError(w, http.StatusInternalServerError, "could not load gift")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, gift)
+}
+
+func validSlug(slug string) bool {
+	if len(slug) == 0 || len(slug) > 100 {
+		return false
+	}
+	for index, character := range slug {
+		if (character >= 'a' && character <= 'z') ||
+			(character >= 'A' && character <= 'Z') ||
+			(character >= '0' && character <= '9') ||
+			(character == '-' && index > 0 && index < len(slug)-1) {
+			continue
+		}
+		return false
+	}
+	return true
+}
+
+func writeError(w http.ResponseWriter, status int, message string) {
+	writeJSON(w, status, map[string]string{"error": message})
+}
+
+func writeJSON(w http.ResponseWriter, status int, value any) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(value)
+}