2 tofuproxy -- flexible HTTP/HTTPS proxy, TLS terminator, X.509 TOFU
3 manager, WARC/geminispace browser
4 Copyright (C) 2021 Sergey Matveev <stargrave@stargrave.org>
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, version 3 of the License.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
31 "go.stargrave.org/tofuproxy/fifos"
34 const CmdDWebP = "dwebp"
36 func isXombrero(req *http.Request) bool {
37 return strings.Contains(req.Header.Get("User-Agent"), "AppleWebKit/538.15")
40 func RoundTranscodeWebP(
43 w http.ResponseWriter,
46 if resp.Header.Get("Content-Type") != "image/webp" || isXombrero(req) {
49 tmpFd, err := ioutil.TempFile("", "tofuproxy.*.webp")
53 defer os.Remove(tmpFd.Name())
55 defer resp.Body.Close()
56 if _, err = io.Copy(tmpFd, resp.Body); err != nil {
57 log.Printf("Error during %s: %+v\n", req.URL, err)
61 cmd := exec.Command(CmdDWebP, tmpFd.Name(), "-o", "-")
62 data, err := cmd.Output()
66 w.Header().Add("Content-Type", "image/png")
67 w.WriteHeader(http.StatusOK)
69 fifos.LogVarious <- fmt.Sprintf("%s %s\tWebP transcoded to PNG", req.Method, req.URL)