feat: HTTP panel on :8000 with first admin setup

internal/handler/setup.go

@@ -0,0 +1,65 @@
+package handler
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"github.com/panelhosting/panel/internal/auth"
+	"github.com/panelhosting/panel/internal/setup"
+)
+
+type SetupHandler struct {
+	svc *setup.Service
+}
+
+func NewSetupHandler(svc *setup.Service) *SetupHandler {
+	return &SetupHandler{svc: svc}
+}
+
+func (h *SetupHandler) Status(w http.ResponseWriter, r *http.Request) {
+	required, err := h.svc.Status(r.Context())
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "internal error")
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]bool{"setup_required": required})
+}
+
+func (h *SetupHandler) Register(w http.ResponseWriter, r *http.Request) {
+	var in setup.RegisterInput
+	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid json")
+		return
+	}
+
+	user, err := h.svc.RegisterFirstAdmin(r.Context(), in)
+	if err != nil {
+		switch {
+		case errors.Is(err, setup.ErrSetupCompleted):
+			writeError(w, http.StatusConflict, "setup already completed")
+		case errors.Is(err, auth.ErrPasswordTooShort),
+			errors.Is(err, auth.ErrInvalidEmail),
+			errors.Is(err, auth.ErrInvalidUsername):
+			writeError(w, http.StatusBadRequest, err.Error())
+		default:
+			writeError(w, http.StatusInternalServerError, "registration failed")
+		}
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, map[string]any{
+		"message": "admin created",
+		"user":    user,
+	})
+}
+
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(v)
+}
+
+func writeError(w http.ResponseWriter, status int, msg string) {
+	writeJSON(w, status, map[string]string{"error": msg})
+}