feat: Users API, ownership transfer and removal of the legacy role string

api/handlers/user/roleHandler.go

@@ -0,0 +1,88 @@
+package user
+
+import (
+	"RenewCMS/api/pkg/access"
+	"RenewCMS/api/pkg/apperr"
+	validator "RenewCMS/api/pkg/validator"
+	"RenewCMS/internal/domain/role"
+	domain "RenewCMS/internal/domain/user"
+	"RenewCMS/internal/infrastructure/useCases"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strconv"
+
+	"github.com/go-chi/chi/v5"
+)
+
+type RoleHandler struct {
+	ChangeUserRoleUseCase *useCases.ChangeUserRoleUseCase
+}
+
+type ChangeRoleRequest struct {
+	RoleID uint32 `json:"role_id" validate:"required"`
+}
+
+func NewRoleHandler(changeRole *useCases.ChangeUserRoleUseCase) *RoleHandler {
+	return &RoleHandler{ChangeUserRoleUseCase: changeRole}
+}
+
+func userListItemOf(entry useCases.DirectoryEntry) userListItem {
+	return userListItem{entry.ID, entry.Kind, entry.Username, entry.DisplayName, entry.Email, entry.Role, entry.Status, entry.CreatedAt}
+}
+
+func writeNoStoreJSON(w http.ResponseWriter, status int, payload any) {
+	body, err := json.Marshal(payload)
+	if err != nil {
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Cache-Control", "no-store")
+	w.WriteHeader(status)
+	_, _ = w.Write(body)
+}
+
+func (h *RoleHandler) Change(w http.ResponseWriter, r *http.Request) {
+	targetID, err := strconv.ParseUint(chi.URLParam(r, "id"), 10, 32)
+	if err != nil {
+		http.Error(w, apperr.IdUint32ErrorMessage, http.StatusBadRequest)
+		return
+	}
+
+	var request ChangeRoleRequest
+	if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+	if err := validator.Validate.Struct(request); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	changed, err := h.ChangeUserRoleUseCase.ChangeRole(r.Context(), useCases.ChangeUserRoleCommand{
+		Caller:   access.CallerOf(r),
+		TargetID: uint32(targetID),
+		RoleID:   request.RoleID,
+	})
+	if err != nil {
+		writeChangeRoleError(w, err)
+		return
+	}
+	writeNoStoreJSON(w, http.StatusOK, userListItemOf(changed))
+}
+
+func writeChangeRoleError(w http.ResponseWriter, err error) {
+	if writeRoleRefusal(w, err) {
+		return
+	}
+	switch {
+	case errors.Is(err, role.ErrOwnRole):
+		http.Error(w, apperr.OwnRoleErrorMessage, http.StatusForbidden)
+	case errors.Is(err, domain.ErrUserNotFound):
+		http.Error(w, apperr.UserNotFoundErrorMessage, http.StatusNotFound)
+	case errors.Is(err, domain.ErrRoleChanged):
+		http.Error(w, apperr.UserRoleChangedErrorMessage, http.StatusConflict)
+	default:
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+	}
+}