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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package markup
import (
"strings"
"golang.org/x/net/html"
)
func isAnchorIDUserContent(s string) bool {
// blackfridayExtRegex is for blackfriday extensions create IDs like fn:user-content-footnote
// old logic: blackfridayExtRegex = regexp.MustCompile(`[^:]*:user-content-`)
return strings.HasPrefix(s, "user-content-") || strings.Contains(s, ":user-content-")
}
func processNodeAttrID(node *html.Node) {
// Add user-content- to IDs and "#" links if they don't already have them,
// and convert the link href to a relative link to the host root
for idx, attr := range node.Attr {
if attr.Key == "id" {
if !isAnchorIDUserContent(attr.Val) {
node.Attr[idx].Val = "user-content-" + attr.Val
}
}
}
}
func processNodeA(ctx *RenderContext, node *html.Node) {
for idx, attr := range node.Attr {
if attr.Key == "href" {
if anchorID, ok := strings.CutPrefix(attr.Val, "#"); ok {
if !isAnchorIDUserContent(attr.Val) {
node.Attr[idx].Val = "#user-content-" + anchorID
}
} else {
node.Attr[idx].Val = ctx.RenderHelper.ResolveLink(attr.Val, LinkTypeDefault)
}
}
}
}
func visitNodeImg(ctx *RenderContext, img *html.Node) (next *html.Node) {
next = img.NextSibling
for i, imgAttr := range img.Attr {
if imgAttr.Key != "src" {
continue
}
imgSrcOrigin := imgAttr.Val
isLinkable := imgSrcOrigin != "" && !strings.HasPrefix(imgSrcOrigin, "data:")
// By default, the "<img>" tag should also be clickable,
// because frontend use `<img>` to paste the re-scaled image into the markdown,
// so it must match the default markdown image behavior.
cnt := 0
for p := img.Parent; isLinkable && p != nil && cnt < 2; p = p.Parent {
if hasParentAnchor := p.Type == html.ElementNode && p.Data == "a"; hasParentAnchor {
isLinkable = false
break
}
cnt++
}
if isLinkable {
wrapper := &html.Node{Type: html.ElementNode, Data: "a", Attr: []html.Attribute{
{Key: "href", Val: ctx.RenderHelper.ResolveLink(imgSrcOrigin, LinkTypeDefault)},
{Key: "target", Val: "_blank"},
}}
parent := img.Parent
imgNext := img.NextSibling
parent.RemoveChild(img)
parent.InsertBefore(wrapper, imgNext)
wrapper.AppendChild(img)
}
imgAttr.Val = ctx.RenderHelper.ResolveLink(imgSrcOrigin, LinkTypeMedia)
imgAttr.Val = camoHandleLink(imgAttr.Val)
img.Attr[i] = imgAttr
}
return next
}
func visitNodeVideo(ctx *RenderContext, node *html.Node) (next *html.Node) {
next = node.NextSibling
for i, attr := range node.Attr {
if attr.Key != "src" {
continue
}
if IsNonEmptyRelativePath(attr.Val) {
attr.Val = ctx.RenderHelper.ResolveLink(attr.Val, LinkTypeMedia)
}
attr.Val = camoHandleLink(attr.Val)
node.Attr[i] = attr
}
return next
}
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