1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.MediaProxy.MediaProxyController do
use Pleroma.Web, :controller
alias Pleroma.Config
alias Pleroma.Helpers.MediaHelper
alias Pleroma.Helpers.UriHelper
alias Pleroma.ReverseProxy
alias Pleroma.Web.MediaProxy
alias Plug.Conn
def remote(conn, %{"sig" => sig64, "url" => url64}) do
with {_, true} <- {:enabled, MediaProxy.enabled?()},
{:ok, url} <- MediaProxy.decode_url(sig64, url64),
{_, false} <- {:in_banned_urls, MediaProxy.in_banned_urls(url)},
:ok <- MediaProxy.verify_request_path_and_url(conn, url) do
ReverseProxy.call(conn, url, media_proxy_opts())
else
{:enabled, false} ->
send_resp(conn, 404, Conn.Status.reason_phrase(404))
{:in_banned_urls, true} ->
send_resp(conn, 404, Conn.Status.reason_phrase(404))
{:error, :invalid_signature} ->
send_resp(conn, 403, Conn.Status.reason_phrase(403))
{:wrong_filename, filename} ->
redirect(conn, external: MediaProxy.build_url(sig64, url64, filename))
end
end
def preview(%Conn{} = conn, %{"sig" => sig64, "url" => url64}) do
with {_, true} <- {:enabled, MediaProxy.preview_enabled?()},
{:ok, url} <- MediaProxy.decode_url(sig64, url64),
:ok <- MediaProxy.verify_request_path_and_url(conn, url) do
handle_preview(conn, url)
else
{:enabled, false} ->
send_resp(conn, 404, Conn.Status.reason_phrase(404))
{:error, :invalid_signature} ->
send_resp(conn, 403, Conn.Status.reason_phrase(403))
{:wrong_filename, filename} ->
redirect(conn, external: MediaProxy.build_preview_url(sig64, url64, filename))
end
end
defp handle_preview(conn, url) do
media_proxy_url = MediaProxy.url(url)
with {:ok, %{status: status} = head_response} when status in 200..299 <-
Pleroma.HTTP.request("head", media_proxy_url, [], [], pool: :media) do
content_type = Tesla.get_header(head_response, "content-type")
content_length = Tesla.get_header(head_response, "content-length")
content_length = content_length && String.to_integer(content_length)
static = conn.params["static"] in ["true", true]
cond do
static and content_type == "image/gif" ->
handle_jpeg_preview(conn, media_proxy_url)
static ->
drop_static_param_and_redirect(conn)
content_type == "image/gif" ->
redirect(conn, external: media_proxy_url)
min_content_length_for_preview() > 0 and content_length > 0 and
content_length < min_content_length_for_preview() ->
redirect(conn, external: media_proxy_url)
true ->
handle_preview(content_type, conn, media_proxy_url)
end
else
# If HEAD failed, redirecting to media proxy URI doesn't make much sense; returning an error
{_, %{status: status}} ->
send_resp(conn, :failed_dependency, "Can't fetch HTTP headers (HTTP #{status}).")
{:error, :recv_response_timeout} ->
send_resp(conn, :failed_dependency, "HEAD request timeout.")
_ ->
send_resp(conn, :failed_dependency, "Can't fetch HTTP headers.")
end
end
defp handle_preview("image/png" <> _ = _content_type, conn, media_proxy_url) do
handle_png_preview(conn, media_proxy_url)
end
defp handle_preview("image/" <> _ = _content_type, conn, media_proxy_url) do
handle_jpeg_preview(conn, media_proxy_url)
end
defp handle_preview("video/" <> _ = _content_type, conn, media_proxy_url) do
handle_video_preview(conn, media_proxy_url)
end
defp handle_preview(_unsupported_content_type, conn, media_proxy_url) do
fallback_on_preview_error(conn, media_proxy_url)
end
defp handle_png_preview(conn, media_proxy_url) do
quality = Config.get!([:media_preview_proxy, :image_quality])
{thumbnail_max_width, thumbnail_max_height} = thumbnail_max_dimensions()
with {:ok, thumbnail_binary} <-
MediaHelper.image_resize(
media_proxy_url,
%{
max_width: thumbnail_max_width,
max_height: thumbnail_max_height,
quality: quality,
format: "png"
}
) do
conn
|> put_preview_response_headers(["image/png", "preview.png"])
|> send_resp(200, thumbnail_binary)
else
_ ->
fallback_on_preview_error(conn, media_proxy_url)
end
end
defp handle_jpeg_preview(conn, media_proxy_url) do
quality = Config.get!([:media_preview_proxy, :image_quality])
{thumbnail_max_width, thumbnail_max_height} = thumbnail_max_dimensions()
with {:ok, thumbnail_binary} <-
MediaHelper.image_resize(
media_proxy_url,
%{max_width: thumbnail_max_width, max_height: thumbnail_max_height, quality: quality}
) do
conn
|> put_preview_response_headers()
|> send_resp(200, thumbnail_binary)
else
_ ->
fallback_on_preview_error(conn, media_proxy_url)
end
end
defp handle_video_preview(conn, media_proxy_url) do
with {:ok, thumbnail_binary} <-
MediaHelper.video_framegrab(media_proxy_url) do
conn
|> put_preview_response_headers()
|> send_resp(200, thumbnail_binary)
else
_ ->
fallback_on_preview_error(conn, media_proxy_url)
end
end
defp drop_static_param_and_redirect(conn) do
uri_without_static_param =
conn
|> current_url()
|> UriHelper.modify_uri_params(%{}, ["static"])
redirect(conn, external: uri_without_static_param)
end
defp fallback_on_preview_error(conn, media_proxy_url) do
redirect(conn, external: media_proxy_url)
end
defp put_preview_response_headers(
conn,
[content_type, filename] = _content_info \\ ["image/jpeg", "preview.jpg"]
) do
conn
|> put_resp_header("content-type", content_type)
|> put_resp_header("content-disposition", "inline; filename=\"#{filename}\"")
|> put_resp_header("cache-control", ReverseProxy.default_cache_control_header())
end
defp thumbnail_max_dimensions do
config = media_preview_proxy_config()
thumbnail_max_width = Keyword.fetch!(config, :thumbnail_max_width)
thumbnail_max_height = Keyword.fetch!(config, :thumbnail_max_height)
{thumbnail_max_width, thumbnail_max_height}
end
defp min_content_length_for_preview do
Keyword.get(media_preview_proxy_config(), :min_content_length, 0)
end
defp media_preview_proxy_config do
Config.get!([:media_preview_proxy])
end
defp media_proxy_opts do
Config.get([:media_proxy, :proxy_opts], [])
end
end
|
