137 lines
4.3 KiB
Elixir
137 lines
4.3 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.ControllerHelper do
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use Pleroma.Web, :controller
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alias Pleroma.Pagination
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# As in Mastodon API, per https://api.rubyonrails.org/classes/ActiveModel/Type/Boolean.html
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@falsy_param_values [false, 0, "0", "f", "F", "false", "False", "FALSE", "off", "OFF"]
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def explicitly_falsy_param?(value), do: value in @falsy_param_values
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# Note: `nil` and `""` are considered falsy values in Pleroma
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def falsy_param?(value),
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do: explicitly_falsy_param?(value) or value in [nil, ""]
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def truthy_param?(value), do: not falsy_param?(value)
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def json_response(conn, status, json) do
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conn
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|> put_status(status)
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|> json(json)
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end
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@spec fetch_integer_param(map(), String.t(), integer() | nil) :: integer() | nil
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def fetch_integer_param(params, name, default \\ nil) do
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params
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|> Map.get(name, default)
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|> param_to_integer(default)
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end
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defp param_to_integer(val, _) when is_integer(val), do: val
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defp param_to_integer(val, default) when is_binary(val) do
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case Integer.parse(val) do
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{res, _} -> res
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_ -> default
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end
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end
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defp param_to_integer(_, default), do: default
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def add_link_headers(conn, activities, extra_params \\ %{})
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def add_link_headers(%{assigns: %{skip_link_headers: true}} = conn, _activities, _extra_params),
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do: conn
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def add_link_headers(conn, activities, extra_params) do
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case get_pagination_fields(conn, activities, extra_params) do
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%{"next" => next_url, "prev" => prev_url} ->
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put_resp_header(conn, "link", "<#{next_url}>; rel=\"next\", <#{prev_url}>; rel=\"prev\"")
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_ ->
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conn
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end
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end
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@id_keys Pagination.page_keys() -- ["limit", "order"]
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defp build_pagination_fields(conn, min_id, max_id, extra_params) do
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params =
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conn.params
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|> Map.drop(Map.keys(conn.path_params))
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|> Map.merge(extra_params)
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|> Map.drop(@id_keys)
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fields = %{
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"next" => current_url(conn, Map.put(params, :max_id, max_id)),
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"prev" => current_url(conn, Map.put(params, :min_id, min_id))
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}
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# Generating an `id` without already present pagination keys would
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# need a query-restriction with an `q.id >= ^id` or `q.id <= ^id`
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# instead of the `q.id > ^min_id` and `q.id < ^max_id`.
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# This is because we only have ids present inside of the page, while
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# `min_id`, `since_id` and `max_id` requires to know one outside of it.
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if Map.take(conn.params, @id_keys) != %{} do
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Map.put(fields, "id", current_url(conn))
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else
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fields
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end
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end
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def get_pagination_fields(conn, activities, extra_params \\ %{}) do
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case List.last(activities) do
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%{pagination_id: max_id} when not is_nil(max_id) ->
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%{pagination_id: min_id} =
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activities
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|> List.first()
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build_pagination_fields(conn, min_id, max_id, extra_params)
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%{id: max_id} ->
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%{id: min_id} =
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activities
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|> List.first()
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build_pagination_fields(conn, min_id, max_id, extra_params)
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_ ->
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%{}
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end
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end
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def assign_account_by_id(conn, _) do
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case Pleroma.User.get_cached_by_id(conn.params.id) do
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%Pleroma.User{} = account -> assign(conn, :account, account)
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nil -> Pleroma.Web.MastodonAPI.FallbackController.call(conn, {:error, :not_found}) |> halt()
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end
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end
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def try_render(conn, target, params) when is_binary(target) do
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case render(conn, target, params) do
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nil -> render_error(conn, :not_implemented, "Can't display this activity")
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res -> res
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end
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end
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def try_render(conn, _, _) do
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render_error(conn, :not_implemented, "Can't display this activity")
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end
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@doc """
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Returns true if request specifies to include embedded relationships in account objects.
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May only be used in selected account-related endpoints; has no effect for status- or
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notification-related endpoints.
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"""
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# Intended for PleromaFE: https://git.pleroma.social/pleroma/pleroma-fe/-/issues/838
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def embed_relationships?(params) do
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# To do once OpenAPI transition mess is over: just `truthy_param?(params[:with_relationships])`
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params
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|> Map.get(:with_relationships, params["with_relationships"])
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|> truthy_param?()
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end
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end
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