Merge branch 'fix/credo-issues' into 'develop'

[akkoma] / lib / pleroma / web / media_proxy / controller.ex

diff --git a/lib/pleroma/web/media_proxy/controller.ex b/lib/pleroma/web/media_proxy/controller.ex
index 8195a665edc1c7da5ab5bd4f0d7e09db5f0694ee..c0552d89f4bd98ea09d2ad047ba974c02f8b3846 100644 (file)
--- a/lib/pleroma/web/media_proxy/controller.ex
+++ b/lib/pleroma/web/media_proxy/controller.ex
@@ -1,97 +1,44 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.MediaProxy.MediaProxyController do
   use Pleroma.Web, :controller
-  require Logger
-
-  @httpoison Application.get_env(:pleroma, :httpoison)
-
-  @max_body_length 25 * 1_048_576
+  alias Pleroma.ReverseProxy
+  alias Pleroma.Web.MediaProxy
 
-  @cache_control %{
-    default: "public, max-age=1209600",
-    error: "public, must-revalidate, max-age=160"
-  }
+  @default_proxy_opts [max_body_length: 25 * 1_048_576, http: [follow_redirect: true]]
 
-  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),
-         {:ok, content_type, body} <- proxy_request(url) do
-      conn
-      |> put_resp_content_type(content_type)
-      |> set_cache_header(:default)
-      |> send_resp(200, body)
+  def remote(conn, %{"sig" => sig64, "url" => url64} = params) do
+    with config <- Pleroma.Config.get([:media_proxy], []),
+         true <- Keyword.get(config, :enabled, false),
+         {:ok, url} <- MediaProxy.decode_url(sig64, url64),
+         :ok <- filename_matches(Map.has_key?(params, "filename"), conn.request_path, url) do
+      ReverseProxy.call(conn, url, Keyword.get(config, :proxy_opts, @default_proxy_opts))
     else
       false ->
-        send_error(conn, 404)
+        send_resp(conn, 404, Plug.Conn.Status.reason_phrase(404))
 
       {:error, :invalid_signature} ->
-        send_error(conn, 403)
+        send_resp(conn, 403, Plug.Conn.Status.reason_phrase(403))
 
-      {:error, {:http, _, url}} ->
-        redirect_or_error(conn, url, Keyword.get(config, :redirect_on_failure, true))
+      {:wrong_filename, filename} ->
+        redirect(conn, external: MediaProxy.build_url(sig64, url64, filename))
     end
   end
 
-  defp proxy_request(link) do
-    headers = [
-      {"user-agent",
-       "Pleroma/MediaProxy; #{Pleroma.Web.base_url()} <#{
-         Application.get_env(:pleroma, :instance)[:email]
-       }>"}
-    ]
+  def filename_matches(has_filename, path, url) do
+    filename =
+      url
+      |> MediaProxy.filename()
+      |> URI.decode()
 
-    options =
-      @httpoison.process_request_options([:insecure, {:follow_redirect, true}]) ++
-        [{:pool, :default}]
+    path = URI.decode(path)
 
-    with {:ok, 200, headers, client} <- :hackney.request(:get, link, headers, "", options),
-         headers = Enum.into(headers, Map.new()),
-         {:ok, body} <- proxy_request_body(client),
-         content_type <- proxy_request_content_type(headers, body) do
-      {:ok, content_type, body}
+    if has_filename && filename && Path.basename(path) != filename do
+      {:wrong_filename, filename}
     else
-      {:ok, status, _, _} ->
-        Logger.warn("MediaProxy: request failed, status #{status}, link: #{link}")
-        {:error, {:http, :bad_status, link}}
-
-      {:error, error} ->
-        Logger.warn("MediaProxy: request failed, error #{inspect(error)}, link: #{link}")
-        {:error, {:http, error, link}}
-    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)
-
-  defp send_error(conn, code, body \\ "") do
-    conn
-    |> set_cache_header(:error)
-    |> send_resp(code, body)
-  end
-
-  defp proxy_request_body(client), do: proxy_request_body(client, <<>>)
-
-  defp proxy_request_body(client, body) when byte_size(body) < @max_body_length do
-    case :hackney.stream_body(client) do
-      {:ok, data} -> proxy_request_body(client, <<body::binary, data::binary>>)
-      :done -> {:ok, body}
-      {:error, reason} -> {:error, reason}
+      :ok
     end
   end
-
-  defp proxy_request_body(client, _) do
-    :hackney.close(client)
-    {:error, :body_too_large}
-  end
-
-  # TODO: the body is passed here as well because some hosts do not provide a content-type.
-  # At some point we may want to use magic numbers to discover the content-type and reply a proper one.
-  defp proxy_request_content_type(headers, _body) do
-    headers["Content-Type"] || headers["content-type"] || "image/jpeg"
-  end
 end