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Revert "Merge pull request 'MediaProxy: detect images when there's no file extension' (#7933) from mediaproxy-content-type into develop"

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A partial revert, keeping the updated @inline_content_types list and
cosmetic changes.

This reverts commit 4fe567064a, reversing
changes made to 9b8aa2e2ee.
This commit is contained in:
Phantasm 2026-08-13 18:11:18 +02:00
commit f672ab337c
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7 changed files with 23 additions and 294 deletions
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1
changelog.d/mediaproxy-content-type.fix
View file

@ -1 +0,0 @@
Detect image content types for extensionless MediaProxy responses.

174
lib/pleroma/reverse_proxy.ex
View file

@ -17,7 +17,6 @@ defmodule Pleroma.ReverseProxy do
@max_read_duration :timer.seconds(30)
@max_body_length :infinity
@failed_request_ttl :timer.seconds(60)
@sniff_bytes 8 * 1024
@methods ~w(GET HEAD)
@allowed_mime_types Pleroma.Config.get([Pleroma.Upload, :allowed_mime_types], [])
@ -70,12 +69,7 @@ defmodule Pleroma.ReverseProxy do
* `inline_content_types`:
* `true` will not alter `content-disposition` (up to the upstream),
* `false` will add `content-disposition: attachment` to any request,
* a list of whitelisted content types for which `content-disposition: inline`
is always set (overriding any upstream header) so the media can be embedded
in pages; the filename is derived from the content type
* `sniff_content_type` (default `false`): detects an image MIME type from the first
response chunk when the upstream type is missing or `application/octet-stream`.
* a list of whitelisted content types
* `req_headers`, `resp_headers` additional headers.
@ -112,7 +106,6 @@ defmodule Pleroma.ReverseProxy do
| {:req_headers, [{String.t(), String.t()}]}
| {:resp_headers, [{String.t(), String.t()}]}
| {:inline_content_types, boolean() | list(String.t())}
| {:sniff_content_type, boolean()}
| {:redirect_on_failure, boolean()}
@spec call(Plug.Conn.t(), String.t(), list(option())) :: Plug.Conn.t()
@ -228,30 +221,11 @@ defmodule Pleroma.ReverseProxy do
defp response(conn, client, url, status, headers, opts) do
Logger.debug("#{__MODULE__} #{status} #{url} #{inspect(headers)}")
case maybe_prefetch_for_content_type(headers, client, opts) do
{_headers, client, {:error, {:upstream, error}}} ->
Logger.warning(
"#{__MODULE__} request to #{url} failed before streaming: #{inspect(error)}"
)
client().close(client)
track_failed_url(url, error, opts)
conn
|> error_or_redirect(url, 500, "Request failed", opts)
|> halt()
{headers, client, prefetched} ->
stream_response(conn, client, url, status, headers, opts, prefetched)
end
end
defp stream_response(conn, client, url, status, headers, opts, prefetched) do
result =
conn
|> put_resp_headers(build_resp_headers(headers, opts))
|> send_chunked(status)
|> chunk_reply(client, opts, prefetched)
|> chunk_reply(client, opts)
case result do
{:ok, conn} ->
@ -272,29 +246,18 @@ defmodule Pleroma.ReverseProxy do
end
end
defp chunk_reply(conn, client, opts, :none) do
defp chunk_reply(conn, client, opts) do
chunk_reply(conn, client, opts, 0, 0)
end
defp chunk_reply(conn, _client, _opts, :done), do: {:ok, conn}
defp chunk_reply(conn, _client, _opts, {:error, error}), do: {:error, error, conn}
defp chunk_reply(conn, client, opts, {:ok, data, duration}) do
with :ok <-
body_size_constraint(
byte_size(data),
Keyword.get(opts, :max_body_length, @max_body_length)
),
{:ok, conn} <- write_chunk(conn, data) do
chunk_reply(conn, client, opts, byte_size(data), duration)
else
{:error, {:downstream, error}} -> {:error, {:downstream, error}, conn}
{:error, error} -> {:error, {:upstream, error}, conn}
end
end
defp chunk_reply(conn, client, opts, sent_so_far, duration) do
with {:ok, data, client, duration} <- read_chunk(client, duration, opts),
with {:ok, duration} <-
check_read_duration(
duration,
Keyword.get(opts, :max_read_duration, @max_read_duration)
),
{:ok, data, client} <- client().stream_body(client),
{:ok, duration} <- increase_read_duration(duration),
sent_so_far = sent_so_far + byte_size(data),
:ok <-
body_size_constraint(
@ -310,24 +273,6 @@ defmodule Pleroma.ReverseProxy do
end
end
defp read_chunk(client, duration, opts) do
result =
with {:ok, timer} <-
check_read_duration(
duration,
Keyword.get(opts, :max_read_duration, @max_read_duration)
),
{:ok, data, client} <- client().stream_body(client),
{:ok, duration} <- increase_read_duration(timer) do
{:ok, data, client, duration}
end
case result do
{:error, error} -> {:error, {:upstream, error}}
result -> result
end
end
defp write_chunk(conn, data) do
case chunk(conn, data) do
{:error, error} -> {:error, {:downstream, error}}
@ -335,54 +280,6 @@ defmodule Pleroma.ReverseProxy do
end
end
defp maybe_prefetch_for_content_type(headers, client, opts) do
if Keyword.get(opts, :sniff_content_type, false) and generic_content_type?(headers) do
case read_chunk(client, 0, opts) do
{:ok, data, client, duration} ->
{maybe_put_image_content_type(headers, data), client, {:ok, data, duration}}
:done ->
{headers, client, :done}
{:error, error} ->
{headers, client, {:error, error}}
end
else
{headers, client, :none}
end
end
defp generic_content_type?(headers) do
headers
|> get_content_type()
|> String.trim()
|> String.downcase()
|> then(&(&1 in ["", "application/octet-stream"]))
end
defp maybe_put_image_content_type(headers, data) do
with false <- data == "",
{:ok, %{mime_type: "image/" <> _ = content_type}} <-
Majic.perform({:bytes, binary_part(data, 0, min(byte_size(data), @sniff_bytes))},
pool: Pleroma.MajicPool
) do
[
{"content-type", content_type}
| Enum.reject(headers, fn {key, _} -> key == "content-type" end)
]
else
_ -> headers
end
rescue
error ->
Logger.debug("#{__MODULE__}: content-type sniffing failed: #{Exception.message(error)}")
headers
catch
kind, reason ->
Logger.debug("#{__MODULE__}: content-type sniffing failed: #{kind}: #{inspect(reason)}")
headers
end
defp head_response(conn, url, code, headers, opts) do
Logger.debug("#{__MODULE__} #{code} #{url} #{inspect(headers)}")
@ -430,32 +327,15 @@ defmodule Pleroma.ReverseProxy do
|> build_req_range_or_encoding_header(opts)
|> build_req_user_agent_header(opts)
|> merge_headers(Keyword.get(opts, :req_headers, []))
|> maybe_force_identity_encoding(opts)
end
defp merge_headers(headers, extra_headers) do
Enum.reduce(extra_headers, headers, fn {key, value}, headers ->
List.keystore(headers, String.downcase(key), 0, {String.downcase(key), value})
end)
end
defp maybe_force_identity_encoding(headers, opts) do
if Keyword.get(opts, :sniff_content_type, false) do
List.keystore(headers, "accept-encoding", 0, {"accept-encoding", "identity"})
else
headers
end
end
# Disable content-encoding if any @range_headers are requested (see #1823).
defp build_req_range_or_encoding_header(headers, _opts) do
range? = Enum.any?(headers, fn {header, _} -> Enum.member?(@range_headers, header) end)
cond do
range? && List.keymember?(headers, "accept-encoding", 0) ->
if range? && List.keymember?(headers, "accept-encoding", 0) do
List.keydelete(headers, "accept-encoding", 0)
true ->
else
headers
end
end
@ -479,6 +359,12 @@ defmodule Pleroma.ReverseProxy do
|> ensure_no_transform()
end
defp merge_headers(headers, extra_headers) do
Enum.reduce(extra_headers, headers, fn {key, value}, headers ->
List.keystore(headers, String.downcase(key), 0, {String.downcase(key), value})
end)
end
defp ensure_no_transform(headers) do
{_, cache_control} =
List.keyfind(headers, "cache-control", 0, {"cache-control", @default_cache_control_header})
@ -568,20 +454,7 @@ defmodule Pleroma.ReverseProxy do
replace_header(headers, "content-disposition", disposition)
else
if opt == true do
headers
else
name = inline_filename(content_type)
disposition =
if name do
"inline; filename=\"#{name}\""
else
"inline"
end
replace_header(headers, "content-disposition", disposition)
end
end
end
@ -589,13 +462,6 @@ defmodule Pleroma.ReverseProxy do
[{key, value} | Enum.reject(headers, fn {header, _} -> header == key end)]
end
defp inline_filename(content_type) do
case MIME.extensions(content_type) do
[ext | _] when ext != "" -> "inline.#{ext}"
_ -> nil
end
end
defp header_length_constraint(headers, limit) do
lengths =
for {"content-length", value} <- headers,
@ -640,9 +506,7 @@ defmodule Pleroma.ReverseProxy do
end
end
defp check_read_duration(_, _), do: {:ok, :no_duration_limit}
defp increase_read_duration(:no_duration_limit), do: {:ok, :no_duration_limit}
defp check_read_duration(_, _), do: {:ok, :no_duration_limit, :no_duration_limit}
defp increase_read_duration({previous_duration, started})
when is_integer(previous_duration) and is_integer(started) do

1
lib/pleroma/web/mastodon_api/views/status_view.ex
View file

@ -631,7 +631,6 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
String.contains?(media_type, "image") -> "image"
String.contains?(media_type, "video") -> "video"
String.contains?(media_type, "audio") -> "audio"
attachment["type"] == "Image" -> "image"
true -> "unknown"
end

1
lib/pleroma/web/media_proxy/media_proxy_controller.ex
View file

@ -208,7 +208,6 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyController do
defp media_proxy_opts do
Config.get([:media_proxy, :proxy_opts], [])
|> Keyword.put_new(:sniff_content_type, true)
end
defp sandbox(conn, _params) do

112
test/pleroma/reverse_proxy_test.exs
View file

@ -579,56 +579,6 @@ defmodule Pleroma.ReverseProxyTest do
assert Conn.get_resp_header(conn, "content-type") == ["application/octet-stream"]
end
test "sniffs and preserves an image body with a generic content type", %{conn: conn} do
body = File.read!("test/fixtures/image.jpg")
ClientMock
|> expect(:request, fn :get, "/extensionless", headers, _, _ ->
assert {"accept-encoding", "identity"} in headers
{:ok, 200, [{"content-type", "application/octet-stream"}], %{body: body}}
end)
|> expect(:stream_body, fn %{body: ^body} = client ->
{:ok, body, Map.delete(client, :body)}
end)
|> expect(:stream_body, fn %{} -> :done end)
conn =
ReverseProxy.call(conn, "/extensionless",
sniff_content_type: true,
max_read_duration: :infinity,
req_headers: [{"accept-encoding", "gzip"}]
)
assert conn.resp_body == body
assert Conn.get_resp_header(conn, "content-type") == ["image/jpeg"]
assert Conn.get_resp_header(conn, "content-disposition") == [
"inline; filename=\"inline.jpg\""
]
end
test "redirects a content sniffing failure before committing the response", %{conn: conn} do
url = "https://example.com/extensionless"
ClientMock
|> expect(:request, fn :get, ^url, _, _, _ ->
{:ok, 200, [{"content-type", "application/octet-stream"}], %{url: url}}
end)
|> expect(:stream_body, fn _ -> {:error, :closed} end)
|> expect(:close, fn _ -> :ok end)
conn =
ReverseProxy.call(conn, url,
sniff_content_type: true,
redirect_on_failure: true
)
assert conn.status == 302
assert Conn.get_resp_header(conn, "location") == [url]
assert conn.state == :sent
assert Cachex.get(:failed_proxy_url_cache, url) == {:ok, true}
end
test "preserves a generic content type for a non-image body", %{conn: conn} do
body = "not an image"
@ -823,24 +773,6 @@ defmodule Pleroma.ReverseProxyTest do
conn = ReverseProxy.call(conn, "/disposition")
assert {"content-type", "image/gif"} in conn.resp_headers
assert {"content-disposition", "inline; filename=\"inline.gif\""} in conn.resp_headers
end
test "forces inline for inline content types overriding upstream attachment", %{
conn: conn
} do
disposition_headers_mock([
{"content-type", "image/png"},
{"content-disposition", "attachment; filename=\"filename.png\""},
{"content-disposition", "attachment; filename=\"duplicate.png\""},
{"content-length", "0"}
])
conn = ReverseProxy.call(conn, "/disposition")
[disposition] = Conn.get_resp_header(conn, "content-disposition")
assert String.starts_with?(disposition, "inline")
refute String.starts_with?(disposition, "attachment")
end
test "with content-disposition header", %{conn: conn} do
@ -853,50 +785,6 @@ defmodule Pleroma.ReverseProxyTest do
assert {"content-disposition", "attachment; filename=\"filename.jpg\""} in conn.resp_headers
end
test "with inline_content_types: true leaves upstream headers untouched", %{
conn: conn
} do
# opt == true: the proxy must not synthesise or rewrite content-disposition.
disposition_headers_mock([
{"content-type", "image/png"},
{"content-disposition", "attachment; filename=\"upstream.png\""},
{"content-length", "0"}
])
conn = ReverseProxy.call(conn, "/disposition", inline_content_types: true)
assert {"content-disposition", "attachment; filename=\"upstream.png\""} in conn.resp_headers
end
test "forces bare inline for a whitelisted type with no MIME extension", %{
conn: conn
} do
# image/x-foo-bar has no entry in MIME's database, so inline_filename/1
# returns nil and the disposition should be the bare token "inline".
disposition_headers_mock([
{"content-type", "image/x-foo-bar"},
{"content-length", "0"}
])
conn = ReverseProxy.call(conn, "/disposition", inline_content_types: ["image/x-foo-bar"])
[disposition] = Conn.get_resp_header(conn, "content-disposition")
assert disposition == "inline"
end
test "serves modern browser image types inline", %{conn: conn} do
disposition_headers_mock([
{"content-type", "image/webp"},
{"content-length", "0"}
])
conn = ReverseProxy.call(conn, "/disposition")
assert Conn.get_resp_header(conn, "content-disposition") == [
"inline; filename=\"inline.webp\""
]
end
end
describe "content-type sanitisation" do

17
test/pleroma/web/mastodon_api/views/status_view_test.exs
View file

@ -668,23 +668,6 @@ defmodule Pleroma.Web.MastodonAPI.StatusViewTest do
assert expected == StatusView.render("attachment.json", %{attachment: object})
assert_schema(expected, "Attachment", api_spec)
end
test "uses the ActivityStreams image type when the MIME type is generic" do
object = %{
"type" => "Image",
"url" => [
%{
"mediaType" => "application/octet-stream",
"href" => "https://example.com/extensionless"
}
]
}
attachment = StatusView.render("attachment.json", %{attachment: object})
assert attachment.type == "image"
assert attachment.pleroma.mime_type == "application/octet-stream"
end
end
test "put the url advertised in the Activity in to the url attribute" do

5
test/pleroma/web/media_proxy/media_proxy_controller_test.exs
View file

@ -71,10 +71,7 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyControllerTest do
test "it performs ReverseProxy.call with valid signature", %{conn: conn, url: url} do
with_mock Pleroma.ReverseProxy,
call: fn _conn, _url, opts ->
assert opts[:sniff_content_type]
%Conn{status: :success}
end do
call: fn _conn, _url, _opts -> %Conn{status: :success} end do
assert %Conn{status: :success} = get(conn, url)
end
end