mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-11-22 08:42:32 -05:00
ba7da0af31
Fix #31575
https://gitea.com/gitea/docs/pulls/73
(cherry picked from commit 8e2dd5d3ddfb442937c79f05df88d18b856952cb)
(cherry picked from commit 2ffb08bb88)
46 lines
1.3 KiB
Go
46 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.Always || lnkURL.Scheme != "https") {
|
|
return CamoEncode(link)
|
|
}
|
|
}
|
|
return link
|
|
}
|