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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.ApiSpec.RenderError do
	@behaviour Plug

	import Plug.Conn, only: [put_status: 2]
	import Phoenix.Controller, only: [json: 2]
	import Pleroma.Web.Gettext

	@impl Plug
	def init(opts), do: opts

	@impl Plug

	def call(conn, errors) do
	errors =
	Enum.map(errors, fn
	%{name: nil, reason: :invalid_enum} = err ->
	%OpenApiSpex.Cast.Error{err \| name: err.value}

	%{name: nil} = err ->
	%OpenApiSpex.Cast.Error{err \| name: List.last(err.path)}

	err ->
	err
	end)

	conn
	\|> put_status(:bad_request)
	\|> json(%{
	error: errors \|> Enum.map(&message/1) \|> Enum.join(" "),
	errors: errors \|> Enum.map(&render_error/1)
	})
	end

	defp render_error(error) do
	pointer = OpenApiSpex.path_to_string(error)

	%{
	title: "Invalid value",
	source: %{
	pointer: pointer
	},
	message: OpenApiSpex.Cast.Error.message(error)
	}
	end

	defp message(%{reason: :invalid_schema_type, type: type, name: name}) do
	gettext("%{name} - Invalid schema.type. Got: %{type}.",
	name: name,
	type: inspect(type)
	)
	end

	defp message(%{reason: :null_value, name: name} = error) do
	case error.type do
	nil ->
	gettext("%{name} - null value.", name: name)

	type ->
	gettext("%{name} - null value where %{type} expected.",
	name: name,
	type: type
	)
	end
	end

	defp message(%{reason: :all_of, meta: %{invalid_schema: invalid_schema}}) do
	gettext(
	"Failed to cast value as %{invalid_schema}. Value must be castable using `allOf` schemas listed.",
	invalid_schema: invalid_schema
	)
	end

	defp message(%{reason: :any_of, meta: %{failed_schemas: failed_schemas}}) do
	gettext("Failed to cast value using any of: %{failed_schemas}.",
	failed_schemas: failed_schemas
	)
	end

	defp message(%{reason: :one_of, meta: %{failed_schemas: failed_schemas}}) do
	gettext("Failed to cast value to one of: %{failed_schemas}.", failed_schemas: failed_schemas)
	end

	defp message(%{reason: :min_length, length: length, name: name}) do
	gettext("%{name} - String length is smaller than minLength: %{length}.",
	name: name,
	length: length
	)
	end

	defp message(%{reason: :max_length, length: length, name: name}) do
	gettext("%{name} - String length is larger than maxLength: %{length}.",
	name: name,
	length: length
	)
	end

	defp message(%{reason: :unique_items, name: name}) do
	gettext("%{name} - Array items must be unique.", name: name)
	end

	defp message(%{reason: :min_items, length: min, value: array, name: name}) do
	gettext("%{name} - Array length %{length} is smaller than minItems: %{min}.",
	name: name,
	length: length(array),
	min: min
	)
	end

	defp message(%{reason: :max_items, length: max, value: array, name: name}) do
	gettext("%{name} - Array length %{length} is larger than maxItems: %{}.",
	name: name,
	length: length(array),
	max: max
	)
	end

	defp message(%{reason: :multiple_of, length: multiple, value: count, name: name}) do
	gettext("%{name} - %{count} is not a multiple of %{multiple}.",
	name: name,
	count: count,
	multiple: multiple
	)
	end

	defp message(%{reason: :exclusive_max, length: max, value: value, name: name})
	when value >= max do
	gettext("%{name} - %{value} is larger than exclusive maximum %{max}.",
	name: name,
	value: value,
	max: max
	)
	end

	defp message(%{reason: :maximum, length: max, value: value, name: name})
	when value > max do
	gettext("%{name} - %{value} is larger than inclusive maximum %{max}.",
	name: name,
	value: value,
	max: max
	)
	end

	defp message(%{reason: :exclusive_multiple, length: min, value: value, name: name})
	when value <= min do
	gettext("%{name} - %{value} is smaller than exclusive minimum %{min}.",
	name: name,
	value: value,
	min: min
	)
	end

	defp message(%{reason: :minimum, length: min, value: value, name: name})
	when value < min do
	gettext("%{name} - %{value} is smaller than inclusive minimum %{min}.",
	name: name,
	value: value,
	min: min
	)
	end

	defp message(%{reason: :invalid_type, type: type, value: value, name: name}) do
	gettext("%{name} - Invalid %{type}. Got: %{value}.",
	name: name,
	value: OpenApiSpex.TermType.type(value),
	type: type
	)
	end

	defp message(%{reason: :invalid_format, format: format, name: name}) do
	gettext("%{name} - Invalid format. Expected %{format}.", name: name, format: inspect(format))
	end

	defp message(%{reason: :invalid_enum, name: name}) do
	gettext("%{name} - Invalid value for enum.", name: name)
	end

	defp message(%{reason: :polymorphic_failed, type: polymorphic_type}) do
	gettext("Failed to cast to any schema in %{polymorphic_type}",
	polymorphic_type: polymorphic_type
	)
	end

	defp message(%{reason: :unexpected_field, name: name}) do
	gettext("Unexpected field: %{name}.", name: safe_string(name))
	end

	defp message(%{reason: :no_value_for_discriminator, name: field}) do
	gettext("Value used as discriminator for `%{field}` matches no schemas.", name: field)
	end

	defp message(%{reason: :invalid_discriminator_value, name: field}) do
	gettext("No value provided for required discriminator `%{field}`.", name: field)
	end

	defp message(%{reason: :unknown_schema, name: name}) do
	gettext("Unknown schema: %{name}.", name: name)
	end

	defp message(%{reason: :missing_field, name: name}) do
	gettext("Missing field: %{name}.", name: name)
	end

	defp message(%{reason: :missing_header, name: name}) do
	gettext("Missing header: %{name}.", name: name)
	end

	defp message(%{reason: :invalid_header, name: name}) do
	gettext("Invalid value for header: %{name}.", name: name)
	end

	defp message(%{reason: :max_properties, meta: meta}) do
	gettext(
	"Object property count %{property_count} is greater than maxProperties: %{max_properties}.",
	property_count: meta.property_count,
	max_properties: meta.max_properties
	)
	end

	defp message(%{reason: :min_properties, meta: meta}) do
	gettext(
	"Object property count %{property_count} is less than minProperties: %{min_properties}",
	property_count: meta.property_count,
	min_properties: meta.min_properties
	)
	end

	defp safe_string(string) do
	to_string(string) \|> String.slice(0..39)
	end
	end

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