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- // 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
- }
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