forked from AkkomaGang/akkoma
109 lines
3.9 KiB
Elixir
109 lines
3.9 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.MediaProxy.MediaProxyController do
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use Pleroma.Web, :controller
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alias Pleroma.Config
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alias Pleroma.Helpers.MogrifyHelper
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alias Pleroma.ReverseProxy
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alias Pleroma.Web.MediaProxy
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def remote(conn, %{"sig" => sig64, "url" => url64}) do
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with {_, true} <- {:enabled, MediaProxy.enabled?()},
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{:ok, url} <- MediaProxy.decode_url(sig64, url64),
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:ok <- MediaProxy.verify_request_path_and_url(conn, url) do
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proxy_opts = Config.get([:media_proxy, :proxy_opts], [])
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ReverseProxy.call(conn, url, proxy_opts)
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else
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{:enabled, false} ->
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send_resp(conn, 404, Plug.Conn.Status.reason_phrase(404))
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{:error, :invalid_signature} ->
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send_resp(conn, 403, Plug.Conn.Status.reason_phrase(403))
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{:wrong_filename, filename} ->
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redirect(conn, external: MediaProxy.build_url(sig64, url64, filename))
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end
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end
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def preview(conn, %{"sig" => sig64, "url" => url64}) do
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with {_, true} <- {:enabled, MediaProxy.preview_enabled?()},
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{:ok, url} <- MediaProxy.decode_url(sig64, url64),
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:ok <- MediaProxy.verify_request_path_and_url(conn, url) do
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handle_preview(conn, url)
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else
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{:enabled, false} ->
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send_resp(conn, 404, Plug.Conn.Status.reason_phrase(404))
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{:error, :invalid_signature} ->
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send_resp(conn, 403, Plug.Conn.Status.reason_phrase(403))
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{:wrong_filename, filename} ->
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redirect(conn, external: MediaProxy.build_preview_url(sig64, url64, filename))
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end
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end
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defp handle_preview(conn, url) do
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with {:ok, %{status: status} = head_response} when status in 200..299 <-
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Tesla.head(url, opts: [adapter: [timeout: preview_head_request_timeout()]]) do
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content_type = Tesla.get_header(head_response, "content-type")
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handle_preview(content_type, conn, url)
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else
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{_, %{status: status}} ->
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send_resp(conn, :failed_dependency, "Can't fetch HTTP headers (HTTP #{status}).")
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{:error, :recv_response_timeout} ->
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send_resp(conn, :failed_dependency, "HEAD request timeout.")
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_ ->
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send_resp(conn, :failed_dependency, "Can't fetch HTTP headers.")
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end
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end
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defp handle_preview("image/" <> _ = content_type, %{params: params} = conn, url) do
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with {:ok, %{status: status, body: body}} when status in 200..299 <-
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url
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|> MediaProxy.url()
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|> Tesla.get(opts: [adapter: [timeout: preview_timeout()]]),
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{:ok, path} <- MogrifyHelper.store_as_temporary_file(url, body),
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resize_dimensions <-
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Map.get(
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params,
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"limit_dimensions",
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Config.get([:media_preview_proxy, :limit_dimensions])
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),
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%Mogrify.Image{} <- MogrifyHelper.in_place_resize_to_limit(path, resize_dimensions),
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{:ok, image_binary} <- File.read(path),
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_ <- File.rm(path) do
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conn
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|> put_resp_header("content-type", content_type)
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|> send_resp(200, image_binary)
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else
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{_, %{status: _}} ->
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send_resp(conn, :failed_dependency, "Can't fetch the image.")
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{:error, :recv_response_timeout} ->
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send_resp(conn, :failed_dependency, "Downstream timeout.")
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_ ->
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send_resp(conn, :failed_dependency, "Can't handle image preview.")
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end
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end
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defp handle_preview(content_type, conn, _url) do
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send_resp(conn, :unprocessable_entity, "Unsupported content type: #{content_type}.")
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end
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defp preview_head_request_timeout do
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Config.get([:media_preview_proxy, :proxy_opts, :head_request_max_read_duration]) ||
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preview_timeout()
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end
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defp preview_timeout do
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Config.get([:media_preview_proxy, :proxy_opts, :max_read_duration]) ||
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Config.get([:media_proxy, :proxy_opts, :max_read_duration]) ||
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ReverseProxy.max_read_duration_default()
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end
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end
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