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Do not trust remote Cache-Control headers for mediaproxy

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This commit is contained in:
Mark Felder 2020-03-13 11:30:27 -05:00
parent 802b991814
commit ad31d0726a
1 changed files with 2 additions and 9 deletions
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11
lib/pleroma/reverse_proxy/reverse_proxy.ex
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@ -7,7 +7,7 @@ defmodule Pleroma.ReverseProxy do
@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)
@resp_cache_headers ~w(etag date last-modified)
@keep_resp_headers @resp_cache_headers ++
~w(content-type content-disposition content-encoding content-range) ++
~w(accept-ranges vary)
@ -34,9 +34,6 @@ defmodule Pleroma.ReverseProxy do
* request: `#{inspect(@keep_req_headers)}`
* response: `#{inspect(@keep_resp_headers)}`
If no caching headers (`#{inspect(@resp_cache_headers)}`) are returned by upstream, `cache-control` will be
set to `#{inspect(@default_cache_control_header)}`.
Options:
* `redirect_on_failure` (default `false`). Redirects the client to the real remote URL if there's any HTTP
@ -297,16 +294,12 @@ defp build_resp_headers(headers, opts) do
defp build_resp_cache_headers(headers, _opts) do
has_cache? = Enum.any?(headers, fn {k, _} -> k in @resp_cache_headers end)
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"})
List.keystore(headers, "cache-control", 0, {"cache-control", @default_cache_control_header})
true ->
List.keystore(