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