Pleroma/lib/pleroma/web/media_proxy/controller.ex

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defmodule Pleroma.Web.MediaProxy.MediaProxyController do
use Pleroma.Web, :controller
require Logger
@cache_control %{
default: "public, max-age=1209600",
error: "public, must-revalidate, max-age=160",
}
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def remote(conn, %{"sig" => sig, "url" => url}) do
config = Application.get_env(:pleroma, :media_proxy, [])
with \
true <- Keyword.get(config, :enabled, false),
{:ok, url} <- Pleroma.Web.MediaProxy.decode_url(sig, url),
url = URI.encode(url),
{:ok, content_type, body} <- proxy_request(url)
do
conn
|> put_resp_content_type(content_type)
|> set_cache_header(:default)
|> send_resp(200, body)
else
false -> send_error(conn, 404)
{:error, :invalid_signature} -> send_error(conn, 403)
{:error, {:http, _, url}} -> redirect_or_error(conn, url, Keyword.get(config, :redirect_on_failure, true))
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end
end
defp proxy_request(link) do
headers = [{"user-agent", "Pleroma/MediaProxy; #{Pleroma.Web.base_url()} <#{Application.get_env(:pleroma, :instance)[:email]}>"}]
options = [:insecure, {:follow_redirect, true}]
case :hackney.request(:get, link, headers, "", options) do
{:ok, 200, headers, client} ->
headers = Enum.into(headers, Map.new)
{:ok, body} = :hackney.body(client)
{:ok, headers["Content-Type"], body}
{:ok, status, _, _} ->
Logger.warn "MediaProxy: request failed, status #{status}, link: #{link}"
{:error, {:http, :bad_status, link}}
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{:error, error} ->
Logger.warn "MediaProxy: request failed, error #{inspect error}, link: #{link}"
{:error, {:http, error, link}}
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end
end
defp set_cache_header(conn, key) do
Plug.Conn.put_resp_header(conn, "cache-control", @cache_control[key])
end
defp redirect_or_error(conn, url, true), do: redirect(conn, external: url)
defp redirect_or_error(conn, url, _), do: send_error(conn, 502, "Media proxy error: " <> url)
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defp send_error(conn, code, body \\ "") do
conn
|> set_cache_header(:error)
|> send_resp(code, body)
end
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end