71 lines
1.8 KiB
Elixir
71 lines
1.8 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2026 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Plugs.FaviconPlug do
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@behaviour Plug
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@moduledoc """
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This is a shim to call `Plug.Static` but with runtime `from` configuration for instance favicon.
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Serves default or custom favicon.png with cacheable cache-control.
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"""
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import Plug.Conn, only: [put_resp_header: 3, send_resp: 3, halt: 1]
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require Logger
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def init(opts) do
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opts
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|> Keyword.put(:from, "__unconfigured_favicon_static_plug")
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|> Plug.Static.init()
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end
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def call(%{request_path: "/favicon.png"} = conn, opts) do
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case find_favicon_dir() do
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{:ok, dir} ->
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call_static(conn, opts, dir)
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:error ->
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# Favicon should always be available and this should never occur.
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# If it does, halt the pipeline before having unintended side-effects.
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Logger.error("No favicon.png found! Is the default favicon deleted?")
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conn
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|> send_resp(404, "Not found")
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|> halt()
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end
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end
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def call(conn, _) do
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conn
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end
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defp find_favicon_dir do
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instance_dir = Pleroma.Config.get([:instance, :static_dir], "instance/static")
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instance_path = Path.join(instance_dir, "favicon.png")
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priv_dir = Application.app_dir(:pleroma, "priv/static")
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priv_path = Path.join(priv_dir, "favicon.png")
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cond do
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File.exists?(instance_path) -> {:ok, instance_dir}
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File.exists?(priv_path) -> {:ok, priv_dir}
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true -> :error
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end
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end
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defp call_static(conn, opts, from) do
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opts =
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opts
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|> Map.put(:from, from)
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|> Map.put(:content_types, false)
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conn = set_content_type(conn)
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Plug.Static.call(conn, opts)
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end
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defp set_content_type(conn) do
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put_resp_header(conn, "content-type", "image/png")
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end
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end
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