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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 do
@moduledoc """
A module that keeps using definitions for controllers,
views and so on.
This can be used in your application as:
use Pleroma.Web, :controller
use Pleroma.Web, :view
The definitions below will be executed for every view,
controller, etc, so keep them short and clean, focused
on imports, uses and aliases.
Do NOT define functions inside the quoted expressions
below.
"""
def controller do
quote do
use Phoenix.Controller, namespace: Pleroma.Web
import Plug.Conn
import Pleroma.Web.Gettext
import Pleroma.Web.Router.Helpers
import Pleroma.Web.TranslationHelpers
alias Pleroma.Plugs.PlugHelper
plug(:set_put_layout)
defp set_put_layout(conn, _) do
put_layout(conn, Pleroma.Config.get(:app_layout, "app.html"))
end
# Marks a plug intentionally skipped and blocks its execution if it's present in plugs chain
defp skip_plug(conn, plug_module) do
try do
plug_module.skip_plug(conn)
rescue
UndefinedFunctionError ->
raise "#{plug_module} is not skippable. Append `use Pleroma.Web, :plug` to its code."
end
end
# Executed just before actual controller action, invokes before-action hooks (callbacks)
defp action(conn, params) do
with %Plug.Conn{halted: false} <- maybe_halt_on_missing_oauth_scopes_check(conn) do
super(conn, params)
end
end
# Halts if authenticated API action neither performs nor explicitly skips OAuth scopes check
defp maybe_halt_on_missing_oauth_scopes_check(conn) do
if Pleroma.Plugs.AuthExpectedPlug.auth_expected?(conn) &&
not PlugHelper.plug_called_or_skipped?(conn, Pleroma.Plugs.OAuthScopesPlug) do
conn
|> render_error(
:forbidden,
"Security violation: OAuth scopes check was neither handled nor explicitly skipped."
)
|> halt()
else
conn
end
end
end
end
def view do
quote do
use Phoenix.View,
root: "lib/pleroma/web/templates",
namespace: Pleroma.Web
# Import convenience functions from controllers
import Phoenix.Controller, only: [get_csrf_token: 0, get_flash: 2, view_module: 1]
import Pleroma.Web.ErrorHelpers
import Pleroma.Web.Gettext
import Pleroma.Web.Router.Helpers
require Logger
@doc "Same as `render/3` but wrapped in a rescue block"
def safe_render(view, template, assigns \\ %{}) do
Phoenix.View.render(view, template, assigns)
rescue
error ->
Logger.error(
"#{__MODULE__} failed to render #{inspect({view, template})}\n" <>
Exception.format(:error, error, __STACKTRACE__)
)
nil
end
@doc """
Same as `render_many/4` but wrapped in rescue block.
"""
def safe_render_many(collection, view, template, assigns \\ %{}) do
Enum.map(collection, fn resource ->
as = Map.get(assigns, :as) || view.__resource__
assigns = Map.put(assigns, as, resource)
safe_render(view, template, assigns)
end)
|> Enum.filter(& &1)
end
end
end
def router do
quote do
use Phoenix.Router
# credo:disable-for-next-line Credo.Check.Consistency.MultiAliasImportRequireUse
import Plug.Conn
import Phoenix.Controller
end
end
def channel do
quote do
# credo:disable-for-next-line Credo.Check.Consistency.MultiAliasImportRequireUse
use Phoenix.Channel
import Pleroma.Web.Gettext
end
end
def plug do
quote do
alias Pleroma.Plugs.PlugHelper
@doc """
Marks a plug intentionally skipped and blocks its execution if it's present in plugs chain.
"""
def skip_plug(conn) do
PlugHelper.append_to_private_list(
conn,
PlugHelper.skipped_plugs_list_id(),
__MODULE__
)
end
@impl Plug
@doc "If marked as skipped, returns `conn`, and calls `perform/2` otherwise."
def call(%Plug.Conn{} = conn, options) do
if PlugHelper.plug_skipped?(conn, __MODULE__) do
conn
else
conn
|> PlugHelper.append_to_private_list(PlugHelper.called_plugs_list_id(), __MODULE__)
|> perform(options)
end
end
end
end
@doc """
When used, dispatch to the appropriate controller/view/etc.
"""
defmacro __using__(which) when is_atom(which) do
apply(__MODULE__, which, [])
end
def base_url do
Pleroma.Web.Endpoint.url()
end
end

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