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controller_helper.ex
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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ControllerHelper do
use Pleroma.Web, :controller
alias Pleroma.Pagination
alias Pleroma.Web.Utils.Params
def json_response(conn, status, _) when status in [204, :no_content] do
conn
|> put_resp_header("content-type", "application/json")
|> send_resp(status, "")
end
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, entries, extra_params \\ %{})
def add_link_headers(%{assigns: %{skip_link_headers: true}} = conn, _entries, _extra_params),
do: conn
def add_link_headers(conn, entries, extra_params) do
case get_pagination_fields(conn, entries, extra_params) do
%{"next" => next_url, "prev" => prev_url} ->
put_resp_header(conn, "link", "<#{next_url}>; rel=\"next\", <#{prev_url}>; rel=\"prev\"")
_ ->
conn
end
end
@id_keys Pagination.page_keys() -- ["limit", "order"]
defp build_pagination_fields(conn, min_id, max_id, extra_params) do
params =
conn.params
|> Map.drop(Map.keys(conn.path_params) |> Enum.map(&String.to_existing_atom/1))
|> Map.merge(extra_params)
|> Map.drop(@id_keys)
%{
"next" => current_url(conn, Map.put(params, :max_id, max_id)),
"prev" => current_url(conn, Map.put(params, :min_id, min_id)),
"id" => current_url(conn)
}
end
def get_pagination_fields(conn, entries, extra_params \\ %{}) do
case List.last(entries) do
%{pagination_id: max_id} when not is_nil(max_id) ->
%{pagination_id: min_id} = List.first(entries)
build_pagination_fields(conn, min_id, max_id, extra_params)
%{id: max_id} ->
%{id: min_id} = List.first(entries)
build_pagination_fields(conn, min_id, max_id, extra_params)
_ ->
%{}
end
end
def assign_account_by_id(conn, _) do
case Pleroma.User.get_cached_by_id(conn.params.id) do
%Pleroma.User{} = account -> assign(conn, :account, account)
nil -> Pleroma.Web.MastodonAPI.FallbackController.call(conn, {:error, :not_found}) |> halt()
end
end
def try_render(conn, target, params) when is_binary(target) do
case render(conn, target, params) do
nil -> render_error(conn, :not_implemented, "Can't display this activity")
res -> res
end
end
def try_render(conn, _, _) do
render_error(conn, :not_implemented, "Can't display this activity")
end
@doc """
Returns true if request specifies to include embedded relationships in account objects.
May only be used in selected account-related endpoints; has no effect for status- or
notification-related endpoints.
"""
# Intended for PleromaFE: https://git.pleroma.social/pleroma/pleroma-fe/-/issues/838
def embed_relationships?(params) do
# To do once OpenAPI transition mess is over: just `truthy_param?(params[:with_relationships])`
params
|> Map.get(:with_relationships, params["with_relationships"])
|> Params.truthy_param?()
end
end

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