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Refactor markup render to fix various path problems (#34114)

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* Fix #33972
    * Use consistent path resolving for links and medias.
* No need to make the markup renders to resolve the paths, instead, the
paths are all correctly resolved in the "post process" step.
* Fix #33274
* Since 1.23, all paths starting with "/" are relative to current render
context (for example: the current repo branch)
* Introduce `/:root/path-relative-to-root`, then the path will be
rendered as relative to "ROOT_URL"
This commit is contained in:
wxiaoguang
2025-04-04 23:45:23 +08:00
committed by GitHub
parent e8b54d9e44
commit 6cee3bfa96
28 changed files with 239 additions and 286 deletions
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4
modules/markup/markdown/goldmark.go
View File

@ -65,10 +65,6 @@ func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc pa
g.transformHeading(ctx, v, reader, &tocList)
case *ast.Paragraph:
g.applyElementDir(v)
case *ast.Image:
g.transformImage(ctx, v)
case *ast.Link:
g.transformLink(ctx, v)
case *ast.List:
g.transformList(ctx, v, rc)
case *ast.Text:

21
modules/markup/markdown/markdown_test.go
View File

@ -308,12 +308,12 @@ func TestRenderSiblingImages_Issue12925(t *testing.T) {
testcase := `![image1](/image1)
![image2](/image2)
`
expected := `<p><a href="/image1" target="_blank" rel="nofollow noopener"><img src="/image1" alt="image1"></a>
<a href="/image2" target="_blank" rel="nofollow noopener"><img src="/image2" alt="image2"></a></p>
expected := `<p><a href="/image1" target="_blank" rel="nofollow noopener"><img src="/image1" alt="image1"/></a>
<a href="/image2" target="_blank" rel="nofollow noopener"><img src="/image2" alt="image2"/></a></p>
`
res, err := markdown.RenderRawString(markup.NewTestRenderContext(), testcase)
res, err := markdown.RenderString(markup.NewTestRenderContext(), testcase)
assert.NoError(t, err)
assert.Equal(t, expected, res)
assert.Equal(t, expected, string(res))
}
func TestRenderEmojiInLinks_Issue12331(t *testing.T) {
@ -529,3 +529,16 @@ space</p>
assert.NoError(t, err)
assert.Equal(t, expected, string(result))
}
func TestMarkdownLink(t *testing.T) {
defer test.MockVariableValue(&markup.RenderBehaviorForTesting.DisableAdditionalAttributes, true)()
input := `<a href=foo>link1</a>
<a href='/foo'>link2</a>
<a href="#foo">link3</a>`
result, err := markdown.RenderString(markup.NewTestRenderContext("/base", localMetas), input)
assert.NoError(t, err)
assert.Equal(t, `<p><a href="/base/foo" rel="nofollow">link1</a>
<a href="/base/foo" rel="nofollow">link2</a>
<a href="#user-content-foo" rel="nofollow">link3</a></p>
`, string(result))
}

59
modules/markup/markdown/transform_image.go
View File

@ -1,59 +0,0 @@
// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package markdown
import (
"code.gitea.io/gitea/modules/markup"
"github.com/yuin/goldmark/ast"
)
func (g *ASTTransformer) transformImage(ctx *markup.RenderContext, v *ast.Image) {
// Images need two things:
//
// 1. Their src needs to munged to be a real value
// 2. If they're not wrapped with a link they need a link wrapper
// Check if the destination is a real link
if len(v.Destination) > 0 && !markup.IsFullURLBytes(v.Destination) {
v.Destination = []byte(ctx.RenderHelper.ResolveLink(string(v.Destination), markup.LinkTypeMedia))
}
parent := v.Parent()
// Create a link around image only if parent is not already a link
if _, ok := parent.(*ast.Link); !ok && parent != nil {
next := v.NextSibling()
// Create a link wrapper
wrap := ast.NewLink()
wrap.Destination = v.Destination
wrap.Title = v.Title
wrap.SetAttributeString("target", []byte("_blank"))
// Duplicate the current image node
image := ast.NewImage(ast.NewLink())
image.Destination = v.Destination
image.Title = v.Title
for _, attr := range v.Attributes() {
image.SetAttribute(attr.Name, attr.Value)
}
for child := v.FirstChild(); child != nil; {
next := child.NextSibling()
image.AppendChild(image, child)
child = next
}
// Append our duplicate image to the wrapper link
wrap.AppendChild(wrap, image)
// Wire in the next sibling
wrap.SetNextSibling(next)
// Replace the current node with the wrapper link
parent.ReplaceChild(parent, v, wrap)
// But most importantly ensure the next sibling is still on the old image too
v.SetNextSibling(next)
}
}

27
modules/markup/markdown/transform_link.go
View File

@ -1,27 +0,0 @@
// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package markdown
import (
"code.gitea.io/gitea/modules/markup"
"github.com/yuin/goldmark/ast"
)
func resolveLink(ctx *markup.RenderContext, link, userContentAnchorPrefix string) (result string, resolved bool) {
isAnchorFragment := link != "" && link[0] == '#'
if !isAnchorFragment && !markup.IsFullURLString(link) {
link, resolved = ctx.RenderHelper.ResolveLink(link, markup.LinkTypeDefault), true
}
if isAnchorFragment && userContentAnchorPrefix != "" {
link, resolved = userContentAnchorPrefix+link[1:], true
}
return link, resolved
}
func (g *ASTTransformer) transformLink(ctx *markup.RenderContext, v *ast.Link) {
if link, resolved := resolveLink(ctx, string(v.Destination), "#user-content-"); resolved {
v.Destination = []byte(link)
}
}