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diff --git a/lib/open_api_spex/cast/string.ex b/lib/open_api_spex/cast/string.ex
index b1c1fdc..5565a2f 100644
--- a/lib/open_api_spex/cast/string.ex
+++ b/lib/open_api_spex/cast/string.ex
@@ -1,91 +1,98 @@
defmodule OpenApiSpex.Cast.String do
@moduledoc """
This module will cast a binary to either an Elixir DateTime or Date. Otherwise it will
validate a binary based on maxLength, minLength, or a Regex pattern passed through the
schema struct.
"""
alias OpenApiSpex.{Cast, Cast.Error}
@schema_fields [:maxLength, :minLength, :pattern]
def cast(%{value: value, schema: %{format: :date}} = ctx) when is_binary(value) do
case Date.from_iso8601(value) do
{:ok, %Date{} = date} ->
{:ok, date}
_ ->
Cast.error(ctx, {:invalid_format, :date})
end
end
def cast(%{value: value, schema: %{format: :"date-time"}} = ctx) when is_binary(value) do
case DateTime.from_iso8601(value) do
{:ok, %DateTime{} = date_time, _offset} ->
{:ok, date_time}
_ ->
Cast.error(ctx, {:invalid_format, :"date-time"})
end
end
def cast(%{value: value = %Plug.Upload{}, schema: %{format: :binary}}) do
{:ok, value}
end
def cast(%{value: value} = ctx) when is_binary(value) do
apply_validation(ctx, @schema_fields)
end
def cast(ctx) do
Cast.error(ctx, {:invalid_type, :string})
end
## Private functions
defp apply_validation(%{value: value, schema: %{maxLength: max_length}} = ctx, [
:maxLength | fields
])
when is_integer(max_length) do
if String.length(value) > max_length do
ctx
|> apply_error({:max_length, max_length})
|> apply_validation(fields)
else
apply_validation(ctx, fields)
end
end
defp apply_validation(%{value: value, schema: %{minLength: min_length}} = ctx, [
:minLength | fields
])
when is_integer(min_length) do
if String.length(value) < min_length do
ctx
|> apply_error({:min_length, min_length})
|> apply_validation(fields)
else
apply_validation(ctx, fields)
end
end
defp apply_validation(%{value: value, schema: %{pattern: pattern}} = ctx, [:pattern | fields])
when not is_nil(pattern) do
+ pattern =
+ if is_binary(pattern) do
+ Regex.compile!(pattern)
+ else
+ pattern
+ end
+
if Regex.match?(pattern, value) do
apply_validation(ctx, fields)
else
ctx
|> apply_error({:invalid_format, pattern})
|> apply_validation(fields)
end
end
defp apply_validation(ctx, [_field | fields]), do: apply_validation(ctx, fields)
defp apply_validation(%{value: value, errors: []}, []), do: {:ok, value}
defp apply_validation(%{errors: errors}, []) when length(errors) > 0, do: {:error, errors}
defp apply_error(%{errors: errors} = ctx, error_args) do
Map.put(ctx, :errors, [Error.new(ctx, error_args) | errors])
end
end

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