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83 lines
2.2 KiB
83 lines
2.2 KiB
4 days ago
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// Copyright 2024 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package internal
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import (
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"crypto/rand"
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"encoding/base64"
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"html/template"
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"io"
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"regexp"
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"strings"
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"sync"
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"code.gitea.io/gitea/modules/htmlutil"
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"golang.org/x/net/html"
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)
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var reAttrClass = sync.OnceValue[*regexp.Regexp](func() *regexp.Regexp {
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// TODO: it isn't a problem at the moment because our HTML contents are always well constructed
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return regexp.MustCompile(`(<[^>]+)\s+class="([^"]+)"([^>]*>)`)
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})
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// RenderInternal also works without initialization
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// If no initialization (no secureID), it will not protect any attributes and return the original name&value
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type RenderInternal struct {
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secureID string
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secureIDPrefix string
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}
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func (r *RenderInternal) Init(output io.Writer) io.WriteCloser {
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buf := make([]byte, 12)
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_, err := rand.Read(buf)
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if err != nil {
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panic("unable to generate secure id")
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}
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return r.init(base64.URLEncoding.EncodeToString(buf), output)
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}
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func (r *RenderInternal) init(secID string, output io.Writer) io.WriteCloser {
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r.secureID = secID
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r.secureIDPrefix = r.secureID + ":"
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return &finalProcessor{renderInternal: r, output: output}
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}
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func (r *RenderInternal) RecoverProtectedValue(v string) (string, bool) {
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if !strings.HasPrefix(v, r.secureIDPrefix) {
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return "", false
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}
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return v[len(r.secureIDPrefix):], true
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}
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func (r *RenderInternal) SafeAttr(name string) string {
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if r.secureID == "" {
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return name
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}
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return "data-attr-" + name
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}
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func (r *RenderInternal) SafeValue(val string) string {
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if r.secureID == "" {
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return val
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}
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return r.secureID + ":" + val
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}
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func (r *RenderInternal) NodeSafeAttr(attr, val string) html.Attribute {
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return html.Attribute{Key: r.SafeAttr(attr), Val: r.SafeValue(val)}
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}
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func (r *RenderInternal) ProtectSafeAttrs(content template.HTML) template.HTML {
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if r.secureID == "" {
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return content
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}
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return template.HTML(reAttrClass().ReplaceAllString(string(content), `$1 data-attr-class="`+r.secureIDPrefix+`$2"$3`))
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}
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func (r *RenderInternal) FormatWithSafeAttrs(w io.Writer, fmt string, a ...any) error {
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_, err := w.Write([]byte(r.ProtectSafeAttrs(htmlutil.HTMLFormat(fmt, a...))))
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return err
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}
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