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Make pasted "img" tag has the same behavior as markdown image (#31235)

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Fix #31230

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
wxiaoguang 2024-06-04 20:19:41 +08:00 • committed by GitHub
parent 4ca65fabda
commit 9000811118
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GPG key ID: B5690EEEBB952194
5 changed files with 79 additions and 59 deletions
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60
modules/markup/html.go
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@ -372,7 +372,42 @@ func postProcess(ctx *RenderContext, procs []processor, input io.Reader, output
return nil
}
func visitNode(ctx *RenderContext, procs []processor, node *html.Node) {
func handleNodeImg(ctx *RenderContext, img *html.Node) {
for i, attr := range img.Attr {
if attr.Key != "src" {
continue
}
if attr.Val != "" && !IsFullURLString(attr.Val) && !strings.HasPrefix(attr.Val, "/") {
attr.Val = util.URLJoin(ctx.Links.ResolveMediaLink(ctx.IsWiki), attr.Val)
// 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.
hasParentAnchor := false
for p := img.Parent; p != nil; p = p.Parent {
if hasParentAnchor = p.Type == html.ElementNode && p.Data == "a"; hasParentAnchor {
break
}
}
if !hasParentAnchor {
imgA := &html.Node{Type: html.ElementNode, Data: "a", Attr: []html.Attribute{
{Key: "href", Val: attr.Val},
{Key: "target", Val: "_blank"},
}}
parent := img.Parent
imgNext := img.NextSibling
parent.RemoveChild(img)
parent.InsertBefore(imgA, imgNext)
imgA.AppendChild(img)
}
}
attr.Val = camoHandleLink(attr.Val)
img.Attr[i] = attr
}
}
func visitNode(ctx *RenderContext, procs []processor, node *html.Node) *html.Node {
// Add user-content- to IDs and "#" links if they don't already have them
for idx, attr := range node.Attr {
val := strings.TrimPrefix(attr.Val, "#")
@ -397,21 +432,14 @@ func visitNode(ctx *RenderContext, procs []processor, node *html.Node) {
textNode(ctx, procs, node)
case html.ElementNode:
if node.Data == "img" {
for i, attr := range node.Attr {
if attr.Key != "src" {
continue
}
if len(attr.Val) > 0 && !IsFullURLString(attr.Val) && !strings.HasPrefix(attr.Val, "data:image/") {
attr.Val = util.URLJoin(ctx.Links.ResolveMediaLink(ctx.IsWiki), attr.Val)
}
attr.Val = camoHandleLink(attr.Val)
node.Attr[i] = attr
}
next := node.NextSibling
handleNodeImg(ctx, node)
return next
} else if node.Data == "a" {
// Restrict text in links to emojis
procs = emojiProcessors
} else if node.Data == "code" || node.Data == "pre" {
return
return node.NextSibling
} else if node.Data == "i" {
for _, attr := range node.Attr {
if attr.Key != "class" {
@ -434,11 +462,11 @@ func visitNode(ctx *RenderContext, procs []processor, node *html.Node) {
}
}
}
for n := node.FirstChild; n != nil; n = n.NextSibling {
visitNode(ctx, procs, n)
for n := node.FirstChild; n != nil; {
n = visitNode(ctx, procs, n)
}
}
// ignore everything else
return node.NextSibling
}
// textNode runs the passed node through various processors, in order to handle
@ -851,7 +879,7 @@ func issueIndexPatternProcessor(ctx *RenderContext, node *html.Node) {
// FIXME: the use of "mode" is quite dirty and hacky, for example: what is a "document"? how should it be rendered?
// The "mode" approach should be refactored to some other more clear&reliable way.
crossLinkOnly := (ctx.Metas["mode"] == "document" && !ctx.IsWiki)
crossLinkOnly := ctx.Metas["mode"] == "document" && !ctx.IsWiki
var (
found bool