# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.ControllerHelper do use Pleroma.Web, :controller # As in MastoAPI, per https://api.rubyonrails.org/classes/ActiveModel/Type/Boolean.html @falsy_param_values [false, 0, "0", "f", "F", "false", "FALSE", "off", "OFF"] def truthy_param?(blank_value) when blank_value in [nil, ""], do: nil def truthy_param?(value), do: value not in @falsy_param_values def json_response(conn, status, json) do conn |> put_status(status) |> json(json) end @spec fetch_integer_param(map(), String.t(), integer() | nil) :: integer() | nil def fetch_integer_param(params, name, default \\ nil) do params |> Map.get(name, default) |> param_to_integer(default) end defp param_to_integer(val, _) when is_integer(val), do: val defp param_to_integer(val, default) when is_binary(val) do case Integer.parse(val) do {res, _} -> res _ -> default end end defp param_to_integer(_, default), do: default def add_link_headers(conn, activities, extra_params \\ %{}) do case List.last(activities) do %{id: max_id} -> params = conn.params |> Map.drop(Map.keys(conn.path_params)) |> Map.drop(["since_id", "max_id", "min_id"]) |> Map.merge(extra_params) limit = params |> Map.get("limit", "20") |> String.to_integer() min_id = if length(activities) <= limit do activities |> List.first() |> Map.get(:id) else activities |> Enum.at(limit * -1) |> Map.get(:id) end next_url = current_url(conn, Map.merge(params, %{max_id: max_id})) prev_url = current_url(conn, Map.merge(params, %{min_id: min_id})) put_resp_header(conn, "link", "<#{next_url}>; rel=\"next\", <#{prev_url}>; rel=\"prev\"") _ -> conn end end end