134 lines
4.0 KiB
Elixir
134 lines
4.0 KiB
Elixir
defmodule Mobilizon.GraphQL.Error do
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@moduledoc """
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Module to handle errors in GraphQL
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"""
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require Logger
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alias __MODULE__
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alias Mobilizon.Web.Gettext, as: GettextBackend
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import Mobilizon.Web.Gettext, only: [dgettext: 2]
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@type t :: %{code: atom(), message: String.t(), status_code: pos_integer(), field: atom()}
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defstruct [:code, :message, :status_code, :field]
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@type error :: {:error, any()} | {:error, any(), any(), any()} | atom()
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@doc """
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Normalize an error to return `t`.
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"""
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# Error Tuples
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# ------------
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# Regular errors
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@spec normalize(any()) :: t() | list(t())
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def normalize({:error, reason}) do
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handle(reason)
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end
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# Ecto transaction errors
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def normalize({:error, _operation, reason, _changes}) do
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handle(reason)
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end
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# Unhandled errors
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def normalize(other) do
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handle(other)
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end
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# Handle Different Errors
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# -----------------------
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defp handle(code) when is_atom(code) do
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{status, message} = metadata(code)
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%Error{
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code: code,
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message: message,
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status_code: status
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}
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end
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defp handle(errors) when is_list(errors) do
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Enum.map(errors, &handle/1)
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end
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defp handle(%Ecto.Changeset{} = changeset) do
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changeset
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|> Ecto.Changeset.traverse_errors(&translate_error/1)
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|> Enum.map(fn {k, v} ->
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%Error{
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code: :validation,
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message: v,
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field: k,
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status_code: 422
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}
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end)
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end
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defp handle(reason) when is_binary(reason) do
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%Error{
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code: :unknown_error,
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message: reason,
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status_code: 500
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}
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end
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defp handle(%Error{} = error), do: error
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# ... Handle other error types here ...
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defp handle(other) do
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Logger.error("Unhandled error term:\n#{inspect(other)}")
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handle(:unknown)
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end
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# Build Error Metadata
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# --------------------
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defp metadata(:unknown_resource), do: {400, dgettext("errors", "Unknown Resource")}
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defp metadata(:invalid_argument), do: {400, dgettext("errors", "Invalid arguments passed")}
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defp metadata(:unauthenticated), do: {401, dgettext("errors", "You need to be logged in")}
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defp metadata(:password_hash_missing),
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do: {401, dgettext("errors", "Reset your password to login")}
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defp metadata(:incorrect_password), do: {401, dgettext("errors", "Invalid credentials")}
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defp metadata(:unauthorized),
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do: {403, dgettext("errors", "You don't have permission to do this")}
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defp metadata(:not_found), do: {404, dgettext("errors", "Resource not found")}
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defp metadata(:user_not_found), do: {404, dgettext("errors", "User not found")}
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defp metadata(:post_not_found), do: {404, dgettext("errors", "Post not found")}
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defp metadata(:event_not_found), do: {404, dgettext("errors", "Event not found")}
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defp metadata(:group_not_found), do: {404, dgettext("errors", "Group not found")}
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defp metadata(:resource_not_found), do: {404, dgettext("errors", "Resource not found")}
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defp metadata(:discussion_not_found), do: {404, dgettext("errors", "Discussion not found")}
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defp metadata(:unknown), do: {500, dgettext("errors", "Something went wrong")}
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defp metadata(code) do
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Logger.warn("Unhandled error code: #{inspect(code)}")
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{422, to_string(code)}
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end
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# Translates an error message using gettext.
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defp translate_error({msg, opts}) do
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# Because error messages were defined within Ecto, we must
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# call the Gettext module passing our Gettext backend. We
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# also use the "errors" domain as translations are placed
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# in the errors.po file.
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# Ecto will pass the :count keyword if the error message is
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# meant to be pluralized.
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# On your own code and templates, depending on whether you
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# need the message to be pluralized or not, this could be
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# written simply as:
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#
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# dngettext "errors", "1 file", "%{count} files", count
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# dgettext "errors", "is invalid"
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#
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if count = opts[:count] do
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Gettext.dngettext(GettextBackend, "errors", msg, msg, count, opts)
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else
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Gettext.dgettext(GettextBackend, "errors", msg, opts)
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end
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end
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end
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