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zeekayandHanzo Dev
aa87442fdd
Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
// Copyright 2026 Hanzo AI, Inc. 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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"github.com/hanzoai/git/modules/htmlutil"
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"golang.org/x/net/html"
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)
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var reAttrClass = sync.OnceValue(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, extraHeadHTML template.HTML) 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, extraHeadHTML)
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}
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func (r *RenderInternal) init(secID string, output io.Writer, extraHeadHTML template.HTML) 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, extraHeadHTML: extraHeadHTML}
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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 template.HTML, a ...any) error {
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htmlStr := r.ProtectSafeAttrs(htmlutil.HTMLFormat(fmt, a...))
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_, err := io.WriteString(w, string(htmlStr))
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return err
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}
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