136 lines
4.4 KiB
Elixir
136 lines
4.4 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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@httpoison Application.get_env(:pleroma, :httpoison)
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@max_body_length 25 * 1_048_576
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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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# Content-types that will not be returned as content-disposition attachments
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# Override with :media_proxy, :safe_content_types in the configuration
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@safe_content_types [
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"image/gif",
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"image/jpeg",
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"image/jpg",
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"image/png",
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"image/svg+xml",
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"audio/mpeg",
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"audio/mp3",
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"video/webm",
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"video/mp4"
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]
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def remote(conn, params = %{"sig" => sig, "url" => url}) do
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config = Application.get_env(:pleroma, :media_proxy, [])
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with true <- Keyword.get(config, :enabled, false),
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{:ok, url} <- Pleroma.Web.MediaProxy.decode_url(sig, url),
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filename <- Path.basename(URI.parse(url).path),
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true <-
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if(Map.get(params, "filename"),
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do: filename == Path.basename(conn.request_path),
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else: true
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),
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{:ok, content_type, body} <- proxy_request(url),
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safe_content_type <-
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Enum.member?(
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Keyword.get(config, :safe_content_types, @safe_content_types),
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content_type
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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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|> put_resp_header(
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"content-security-policy",
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"default-src 'none'; style-src 'unsafe-inline'; media-src data:; img-src 'self' data:"
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)
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|> put_resp_header("x-xss-protection", "1; mode=block")
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|> put_resp_header("x-content-type-options", "nosniff")
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|> put_attachement_header(safe_content_type, filename)
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|> send_resp(200, body)
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else
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false ->
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send_error(conn, 404)
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{:error, :invalid_signature} ->
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send_error(conn, 403)
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{:error, {:http, _, url}} ->
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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 = [
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{"user-agent",
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"Pleroma/MediaProxy; #{Pleroma.Web.base_url()} <#{
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Application.get_env(:pleroma, :instance)[:email]
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}>"}
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]
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options =
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@httpoison.process_request_options([:insecure, {:follow_redirect, true}]) ++
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[{:pool, :default}]
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with {: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) 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"] || "application/octet-stream"
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end
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defp put_attachement_header(conn, true, _), do: conn
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defp put_attachement_header(conn, false, filename) do
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put_resp_header(conn, "content-disposition", "attachment; filename='#{filename}'")
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end
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end
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