forked from AkkomaGang/akkoma
82 lines
2.9 KiB
Elixir
82 lines
2.9 KiB
Elixir
defmodule Pleroma.Web.MediaProxy.MediaProxyController do
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use Pleroma.Web, :controller
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require Logger
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@max_body_length 25 * 1048576
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@cache_control %{
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default: "public, max-age=1209600",
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error: "public, must-revalidate, max-age=160",
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}
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def remote(conn, %{"sig" => sig, "url" => url}) do
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config = Application.get_env(:pleroma, :media_proxy, [])
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with \
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true <- Keyword.get(config, :enabled, false),
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{:ok, url} <- Pleroma.Web.MediaProxy.decode_url(sig, url),
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{:ok, content_type, body} <- proxy_request(url)
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do
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conn
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|> put_resp_content_type(content_type)
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|> set_cache_header(:default)
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|> send_resp(200, body)
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else
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false -> send_error(conn, 404)
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{:error, :invalid_signature} -> send_error(conn, 403)
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{:error, {:http, _, url}} -> redirect_or_error(conn, url, Keyword.get(config, :redirect_on_failure, true))
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end
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end
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defp proxy_request(link) do
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headers = [{"user-agent", "Pleroma/MediaProxy; #{Pleroma.Web.base_url()} <#{Application.get_env(:pleroma, :instance)[:email]}>"}]
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options = [:insecure, {:follow_redirect, true}]
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with \
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{:ok, 200, headers, client} <- :hackney.request(:get, link, headers, "", options),
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headers = Enum.into(headers, Map.new),
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{:ok, body} <- proxy_request_body(client),
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content_type <- proxy_request_content_type(headers, body)
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do
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{:ok, content_type, body}
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else
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{:ok, status, _, _} ->
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Logger.warn "MediaProxy: request failed, status #{status}, link: #{link}"
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{:error, {:http, :bad_status, link}}
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{:error, error} ->
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Logger.warn "MediaProxy: request failed, error #{inspect error}, link: #{link}"
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{:error, {:http, error, link}}
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end
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end
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defp set_cache_header(conn, key) do
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Plug.Conn.put_resp_header(conn, "cache-control", @cache_control[key])
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end
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defp redirect_or_error(conn, url, true), do: redirect(conn, external: url)
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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
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conn
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|> set_cache_header(:error)
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|> send_resp(code, body)
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end
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defp proxy_request_body(client), do: proxy_request_body(client, <<>>)
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defp proxy_request_body(client, body) when byte_size(body) < @max_body_length do
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case :hackney.stream_body(client) do
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{:ok, data} -> proxy_request_body(client, <<body :: binary, data :: binary>>)
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:done -> {:ok, body}
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{:error, reason} -> {:error, reason}
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end
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end
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defp proxy_request_body(client, _) do
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:hackney.close(client)
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{:error, :body_too_large}
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end
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# TODO: the body is passed here as well because some hosts do not provide a content-type.
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# At some point we may want to use magic numbers to discover the content-type and reply a proper one.
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defp proxy_request_content_type(headers, _body) do
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headers["Content-Type"] || headers["content-type"] || "image/jpeg"
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end
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end
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