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forgejo/modules/markup/markdown/transform_link.go

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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package markdown
import (
"bytes"
"slices"
"code.gitea.io/gitea/modules/markup"
"code.gitea.io/gitea/modules/setting"
giteautil "code.gitea.io/gitea/modules/util"
"github.com/yuin/goldmark/ast"
)
func (g *ASTTransformer) transformLink(ctx *markup.RenderContext, v *ast.Link) {
// Links need their href to munged to be a real value
link := v.Destination
// Do not process the link if it's not a link, starts with an hashtag
// (indicating it's an anchor link), starts with `mailto:` or any of the
// custom markdown URLs.
processLink := len(link) > 0 && !markup.IsLink(link) &&
link[0] != '#' && !bytes.HasPrefix(link, byteMailto) &&
!slices.ContainsFunc(setting.Markdown.CustomURLSchemes, func(s string) bool {
return bytes.HasPrefix(link, []byte(s+":"))
})
if processLink {
var base string
if ctx.IsWiki {
base = ctx.Links.WikiLink()
} else if ctx.Links.HasBranchInfo() {
base = ctx.Links.SrcLink()
} else {
base = ctx.Links.Base
}
link = []byte(giteautil.URLJoin(base, string(link)))
}
if len(link) > 0 && link[0] == '#' {
link = []byte("#user-content-" + string(link)[1:])
}
v.Destination = link
}