e81ccc406b
Change all license headers to comply with REUSE specification. Fix #16132 Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github> Co-authored-by: John Olheiser <john.olheiser@gmail.com>
47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
// Copyright 2022 The Gitea Authors. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
package markup
|
|
|
|
import (
|
|
"crypto/hmac"
|
|
"crypto/sha1"
|
|
"encoding/base64"
|
|
"net/url"
|
|
"strings"
|
|
|
|
"code.gitea.io/gitea/modules/setting"
|
|
"code.gitea.io/gitea/modules/util"
|
|
)
|
|
|
|
// CamoEncode encodes a lnk to fit with the go-camo and camo proxy links. The purposes of camo-proxy are:
|
|
// 1. Allow accessing "http://" images on a HTTPS site by using the "https://" URLs provided by camo-proxy.
|
|
// 2. Hide the visitor's real IP (protect privacy) when accessing external images.
|
|
func CamoEncode(link string) string {
|
|
if strings.HasPrefix(link, setting.Camo.ServerURL) {
|
|
return link
|
|
}
|
|
|
|
mac := hmac.New(sha1.New, []byte(setting.Camo.HMACKey))
|
|
_, _ = mac.Write([]byte(link)) // hmac does not return errors
|
|
macSum := b64encode(mac.Sum(nil))
|
|
encodedURL := b64encode([]byte(link))
|
|
|
|
return util.URLJoin(setting.Camo.ServerURL, macSum, encodedURL)
|
|
}
|
|
|
|
func b64encode(data []byte) string {
|
|
return strings.TrimRight(base64.URLEncoding.EncodeToString(data), "=")
|
|
}
|
|
|
|
func camoHandleLink(link string) string {
|
|
if setting.Camo.Enabled {
|
|
lnkURL, err := url.Parse(link)
|
|
if err == nil && lnkURL.IsAbs() && !strings.HasPrefix(link, setting.AppURL) &&
|
|
(setting.Camo.Allways || lnkURL.Scheme != "https") {
|
|
return CamoEncode(link)
|
|
}
|
|
}
|
|
return link
|
|
}
|