string.ex
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string.ex
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	defmodule OpenApiSpex.Cast.String do
	@moduledoc false
	alias OpenApiSpex.Cast

	def cast(%{value: value} = ctx) when is_binary(value) do
	case cast_binary(ctx) do
	{:cast, ctx} -> cast(ctx)
	result -> result
	end
	end

	def cast(ctx) do
	Cast.error(ctx, {:invalid_type, :string})
	end

	## Private functions

	defp cast_binary(%{value: value, schema: %{format: :"date-time"}} = ctx)
	when is_binary(value) do
	case DateTime.from_iso8601(value) do
	{:ok, %DateTime{}, _offset} -> Cast.success(ctx, :format)
	_ -> Cast.error(ctx, {:invalid_format, :"date-time"})
	end
	end

	defp cast_binary(%{value: value, schema: %{format: :date}} = ctx) do
	case Date.from_iso8601(value) do
	{:ok, %Date{}} -> Cast.success(ctx, :format)
	_ -> Cast.error(ctx, {:invalid_format, :date})
	end
	end

	defp cast_binary(%{value: value, schema: %{pattern: pattern}} = ctx) when not is_nil(pattern) do
	if Regex.match?(pattern, value) do
	Cast.success(ctx, :pattern)
	else
	Cast.error(ctx, {:invalid_format, pattern})
	end
	end

	defp cast_binary(%{value: value, schema: %{minLength: min_length}} = ctx)
	when is_integer(min_length) do
	if String.length(value) < min_length do
	Cast.error(ctx, {:min_length, min_length})
	else
	Cast.success(ctx, :minLength)
	end
	end

	defp cast_binary(%{value: value, schema: %{maxLength: max_length}} = ctx)
	when is_integer(max_length) do
	if String.length(value) > max_length do
	Cast.error(ctx, {:max_length, max_length})
	else
	Cast.success(ctx, :maxLength)
	end
	end

	defp cast_binary(ctx), do: Cast.ok(ctx)
	end