add register method

api/auth/register.go

@@ -0,0 +1,45 @@
+package api_auth
+
+import (
+	"encoding/json"
+	"log/slog"
+	"net/http"
+)
+
+type registerRequest struct {
+	Username string `json:"username"`
+	Email    string `json:"email"`
+	Password string `json:"password"`
+}
+
+type registerResponse struct {
+	UserID   uint   `json:"id"`
+	Username string `json:"username"`
+}
+
+func (h *authHandler) handleRegister(w http.ResponseWriter, r *http.Request) {
+	var req registerRequest
+	err := json.NewDecoder(r.Body).Decode(&req)
+	if err != nil {
+		http.Error(w, "Invalid request payload", http.StatusBadRequest)
+		return
+	}
+
+	user, err := h.a.Register(req.Username, req.Email, req.Password)
+	if err != nil {
+		slog.Error("Failed to register user", "error", err)
+		http.Error(w, "Registration failed", http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	err = json.NewEncoder(w).Encode(registerResponse{
+		UserID:   user.ID,
+		Username: user.Username,
+	})
+	if err != nil {
+		http.Error(w, "Failed to encode response", http.StatusInternalServerError)
+		return
+	}
+	w.WriteHeader(http.StatusCreated)
+}