# get CSRF token (introduced in OpenRefine 3.3)
function get_csrf {
if [[ "${OPENREFINE_CSRF}" == true ]]; then
  local response
  response=$(curl -fs "${OPENREFINE_URL}/command/core/get-csrf-token")
  if ! [[ "${response}" == '{"token":"'* ]]; then
    error "getting CSRF token failed!"
    exit 1
  fi
  echo "?csrf_token=$(echo "$response" | cut -d \" -f 4)"
fi
}