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controller_helper.ex
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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.ControllerHelper do
use Pleroma.Web, :controller
alias Pleroma.Config
# As in Mastodon API, per https://api.rubyonrails.org/classes/ActiveModel/Type/Boolean.html
@falsy_param_values [false, 0, "0", "f", "F", "false", "False", "FALSE", "off", "OFF"]
def explicitly_falsy_param?(value), do: value in @falsy_param_values
# Note: `nil` and `""` are considered falsy values in Pleroma
def falsy_param?(value),
do: explicitly_falsy_param?(value) or value in [nil, ""]
def truthy_param?(value), do: not falsy_param?(value)
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 \\ %{})
def add_link_headers(%{assigns: %{skip_link_headers: true}} = conn, _activities, _extra_params),
do: conn
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
def assign_account_by_id(conn, _) do
# TODO: use `conn.params[:id]` only after moving to OpenAPI
case Pleroma.User.get_cached_by_id(conn.params[: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
@spec put_if_exist(map(), atom() | String.t(), any) :: map()
def put_if_exist(map, _key, nil), do: map
def put_if_exist(map, key, value), do: Map.put(map, key, value)
@doc "Whether to skip rendering `[:account][:pleroma][:relationship]`for statuses/notifications"
def skip_relationships?(params) do
if Config.get([:extensions, :output_relationships_in_statuses_by_default]) do
false
else
# BREAKING: older PleromaFE versions do not send this param but _do_ expect relationships.
not truthy_param?(params["with_relationships"])
end
end
end

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