Merge branch 'captcha' 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 84c6e9c8bcfe1212f63e7573808db7215df7869e..de79cad739b86c841d61b77c6439d3e866b96d5a 100644 (file)
--- a/lib/pleroma/web/media_proxy/controller.ex
+++ b/lib/pleroma/web/media_proxy/controller.ex
@@ -1,49 +1,43 @@
+# 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
-
-  def remote(conn, %{"sig" => sig, "url" => url}) do
-    {:ok, url} = Pleroma.MediaProxy.decode_url(sig, url)
-    url = url |> URI.encode()
-    case proxy_request(url) do
-      {:ok, content_type, body} ->
-        conn
-        |> put_resp_content_type(content_type)
-        |> set_cache_header(:default)
-        |> send_resp(200, body)
-      other ->
-        conn
-        |> set_cache_header(:error)
-        |> redirect(external: url)
-    end
-  end
+  alias Pleroma.{Web.MediaProxy, ReverseProxy}
+
+  @default_proxy_opts [max_body_length: 25 * 1_048_576, http: [follow_redirect: true]]
 
-  defp proxy_request(link) do
-    instance = )
-    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, :bad_status}
-      {:error, error} ->
-        Logger.warn "MediaProxy: request failed, error #{inspect error}, link: #{link}"
-        {:error, error}
+  def remote(conn, params = %{"sig" => sig64, "url" => url64}) 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_resp(conn, 404, Plug.Conn.Status.reason_phrase(404))
+
+      {:error, :invalid_signature} ->
+        send_resp(conn, 403, Plug.Conn.Status.reason_phrase(403))
+
+      {:wrong_filename, filename} ->
+        redirect(conn, external: MediaProxy.build_url(sig64, url64, filename))
     end
   end
 
-  @cache_control %{
-    default: "public, max-age=1209600",
-    error:   "public, must-revalidate, max-age=160",
-  }
+  def filename_matches(has_filename, path, url) do
+    filename =
+      url
+      |> MediaProxy.filename()
+      |> URI.decode()
 
-  defp set_cache_header(conn, true), do: set_cache_header(conn, :default)
-  defp set_cache_header(conn, false), do: set_cache_header(conn, :error)
-  defp set_cache_header(conn, key) when is_atom(key), do: set_cache_header(conn, @cache_control[key])
-  defp set_cache_header(conn, value) when is_binary(value), do: Plug.Conn.put_resp_header(conn, "cache-control", value)
+    path = URI.decode(path)
 
+    if has_filename && filename && Path.basename(path) != filename do
+      {:wrong_filename, filename}
+    else
+      :ok
+    end
+  end
 end