+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
defmodule Pleroma.ReverseProxy do
- @keep_req_headers ~w(accept user-agent accept-encoding cache-control if-modified-since if-unmodified-since if-none-match if-range range)
+ @keep_req_headers ~w(accept user-agent accept-encoding cache-control if-modified-since) ++
+ ~w(if-unmodified-since if-none-match if-range range)
@resp_cache_headers ~w(etag date last-modified cache-control)
@keep_resp_headers @resp_cache_headers ++
- ~w(content-type content-disposition content-encoding content-range accept-ranges vary)
+ ~w(content-type content-disposition content-encoding content-range) ++
+ ~w(accept-ranges vary)
@default_cache_control_header "public, max-age=1209600"
@valid_resp_codes [200, 206, 304]
@max_read_duration :timer.seconds(30)
defp build_resp_cache_headers(headers, _opts) do
has_cache? = Enum.any?(headers, fn {k, _} -> k in @resp_cache_headers end)
-
- if has_cache? do
- headers
- else
- List.keystore(headers, "cache-control", 0, {"cache-control", @default_cache_control_header})
+ has_cache_control? = List.keymember?(headers, "cache-control", 0)
+
+ cond do
+ has_cache? && has_cache_control? ->
+ headers
+
+ has_cache? ->
+ # There's caching header present but no cache-control -- we need to explicitely override it
+ # to public as Plug defaults to "max-age=0, private, must-revalidate"
+ List.keystore(headers, "cache-control", 0, {"cache-control", "public"})
+
+ true ->
+ List.keystore(
+ headers,
+ "cache-control",
+ 0,
+ {"cache-control", @default_cache_control_header}
+ )
end
end