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defmodule PowerDNSx.ZoneValidator do
alias PowerDNSx.Models.Zone
@valid_zone_name_reg ~r/^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$/
def check(%Zone{} = zone) do
verify_attr = fn({attr, value}, errors)->
validate_attr_value(attr, value)
end
errors = Enum.reduce(zone, nil, verify_attr)
if errors, do: {:error, errors}, else: :ok
end
###
# Private
###
defp validate_attr_value(:name, zone_name) do
case validate_zone_name(zone_name) do
{true, true} -> nil
{false, _} -> {:error, %{name: "#{zone_name} is invalid."}}
{_, false} -> {:error, %{name: "#{zone_name} is invalid. Max lenght is 64."}}
{:format_error} -> {:error, %{name: "Name MUST be a string."}}
end
end
defp validate_zone_name(zone_name) when is_bitstring(zone_name) do
{String.match?(zone_name, @valid_zone_name_reg), correct_length?(zone_name)}
end
defp validate_zone_name(_), do: {:format_error}
defp correct_length?(zone_name) do
name = zone_name |> String.split(".") |> hd
name |> String.length <= 63
end
end
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