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Rework markup link rendering (#26745) (#28803)

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Backport #26745
Fixes #26548

This PR refactors the rendering of markup links. The old code uses
`strings.Replace` to change some urls while the new code uses more
context to decide which link should be generated.

The added tests should ensure the same output for the old and new
behaviour (besides the bug).

We may need to refactor the rendering a bit more to make it clear how
the different helper methods render the input string. There are lots of
options (resolve links / images / mentions / git hashes / emojis / ...)
but you don't really know what helper uses which options. For example,
we currently support images in the user description which should not be
allowed I think:

<details>
  <summary>Profile</summary>

https://try.gitea.io/KN4CK3R

![grafik](109ae422-496d-4200-b52e-b3a528f553e5)

</details>

(cherry picked from commit 022552d5b6)
This commit is contained in:
KN4CK3R 2024-01-16 03:13:29 +01:00 • committed by Earl Warren
parent 5124be72aa
commit 875b398e5e
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GPG key ID: 0579CB2928A78A00
42 changed files with 966 additions and 388 deletions
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57
modules/markup/html.go
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@ -80,15 +80,10 @@ const keywordClass = "issue-keyword"
// IsLink reports whether link fits valid format.
func IsLink(link []byte) bool {
return isLink(link)
}
// isLink reports whether link fits valid format.
func isLink(link []byte) bool {
return validLinksPattern.Match(link)
}
func isLinkStr(link string) bool {
func IsLinkStr(link string) bool {
return validLinksPattern.MatchString(link)
}
@ -344,7 +339,7 @@ func postProcess(ctx *RenderContext, procs []processor, input io.Reader, output
node = node.FirstChild
}
visitNode(ctx, procs, procs, node)
visitNode(ctx, procs, node)
newNodes := make([]*html.Node, 0, 5)
@ -375,7 +370,7 @@ func postProcess(ctx *RenderContext, procs []processor, input io.Reader, output
return nil
}
func visitNode(ctx *RenderContext, procs, textProcs []processor, node *html.Node) {
func visitNode(ctx *RenderContext, procs []processor, 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, "#")
@ -390,35 +385,29 @@ func visitNode(ctx *RenderContext, procs, textProcs []processor, node *html.Node
}
if attr.Key == "class" && attr.Val == "emoji" {
textProcs = nil
procs = nil
}
}
// We ignore code and pre.
switch node.Type {
case html.TextNode:
textNode(ctx, textProcs, 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 && !isLinkStr(attr.Val) && !strings.HasPrefix(attr.Val, "data:image/") {
prefix := ctx.URLPrefix
if ctx.IsWiki {
prefix = util.URLJoin(prefix, "wiki", "raw")
}
prefix = strings.Replace(prefix, "/src/", "/media/", 1)
attr.Val = util.URLJoin(prefix, attr.Val)
if len(attr.Val) > 0 && !IsLinkStr(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
}
} else if node.Data == "a" {
// Restrict text in links to emojis
textProcs = emojiProcessors
procs = emojiProcessors
} else if node.Data == "code" || node.Data == "pre" {
return
} else if node.Data == "i" {
@ -444,7 +433,7 @@ func visitNode(ctx *RenderContext, procs, textProcs []processor, node *html.Node
}
}
for n := node.FirstChild; n != nil; n = n.NextSibling {
visitNode(ctx, procs, textProcs, n)
visitNode(ctx, procs, n)
}
}
// ignore everything else
@ -641,10 +630,6 @@ func mentionProcessor(ctx *RenderContext, node *html.Node) {
}
func shortLinkProcessor(ctx *RenderContext, node *html.Node) {
shortLinkProcessorFull(ctx, node, false)
}
func shortLinkProcessorFull(ctx *RenderContext, node *html.Node, noLink bool) {
next := node.NextSibling
for node != nil && node != next {
m := shortLinkPattern.FindStringSubmatchIndex(node.Data)
@ -665,7 +650,7 @@ func shortLinkProcessorFull(ctx *RenderContext, node *html.Node, noLink bool) {
if equalPos := strings.IndexByte(v, '='); equalPos == -1 {
// There is no equal in this argument; this is a mandatory arg
if props["name"] == "" {
if isLinkStr(v) {
if IsLinkStr(v) {
// If we clearly see it is a link, we save it so
// But first we need to ensure, that if both mandatory args provided
@ -740,7 +725,7 @@ func shortLinkProcessorFull(ctx *RenderContext, node *html.Node, noLink bool) {
DataAtom: atom.A,
}
childNode.Parent = linkNode
absoluteLink := isLinkStr(link)
absoluteLink := IsLinkStr(link)
if !absoluteLink {
if image {
link = strings.ReplaceAll(link, " ", "+")
@ -751,16 +736,9 @@ func shortLinkProcessorFull(ctx *RenderContext, node *html.Node, noLink bool) {
link = url.PathEscape(link)
}
}
urlPrefix := ctx.URLPrefix
if image {
if !absoluteLink {
if IsSameDomain(urlPrefix) {
urlPrefix = strings.Replace(urlPrefix, "/src/", "/raw/", 1)
}
if ctx.IsWiki {
link = util.URLJoin("wiki", "raw", link)
}
link = util.URLJoin(urlPrefix, link)
link = util.URLJoin(ctx.Links.ResolveMediaLink(ctx.IsWiki), link)
}
title := props["title"]
if title == "" {
@ -789,18 +767,15 @@ func shortLinkProcessorFull(ctx *RenderContext, node *html.Node, noLink bool) {
} else {
if !absoluteLink {
if ctx.IsWiki {
link = util.URLJoin("wiki", link)
link = util.URLJoin(ctx.Links.WikiLink(), link)
} else {
link = util.URLJoin(ctx.Links.SrcLink(), link)
}
link = util.URLJoin(urlPrefix, link)
}
childNode.Type = html.TextNode
childNode.Data = name
}
if noLink {
linkNode = childNode
} else {
linkNode.Attr = []html.Attribute{{Key: "href", Val: link}}
}
linkNode.Attr = []html.Attribute{{Key: "href", Val: link}}
replaceContent(node, m[0], m[1], linkNode)
node = node.NextSibling.NextSibling
}