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https://github.com/go-gitea/gitea
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022552d5b6
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  </details>
481 lines
14 KiB
Go
481 lines
14 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package markdown
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import (
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"bytes"
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"fmt"
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"regexp"
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"strings"
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"code.gitea.io/gitea/modules/container"
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"code.gitea.io/gitea/modules/markup"
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"code.gitea.io/gitea/modules/markup/common"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/svg"
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giteautil "code.gitea.io/gitea/modules/util"
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"github.com/microcosm-cc/bluemonday/css"
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"github.com/yuin/goldmark/ast"
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east "github.com/yuin/goldmark/extension/ast"
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"github.com/yuin/goldmark/parser"
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"github.com/yuin/goldmark/renderer"
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"github.com/yuin/goldmark/renderer/html"
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"github.com/yuin/goldmark/text"
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"github.com/yuin/goldmark/util"
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)
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var byteMailto = []byte("mailto:")
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// ASTTransformer is a default transformer of the goldmark tree.
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type ASTTransformer struct{}
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// Transform transforms the given AST tree.
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func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) {
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firstChild := node.FirstChild()
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tocMode := ""
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ctx := pc.Get(renderContextKey).(*markup.RenderContext)
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rc := pc.Get(renderConfigKey).(*RenderConfig)
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tocList := make([]markup.Header, 0, 20)
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if rc.yamlNode != nil {
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metaNode := rc.toMetaNode()
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if metaNode != nil {
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node.InsertBefore(node, firstChild, metaNode)
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}
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tocMode = rc.TOC
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}
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applyElementDir := func(n ast.Node) {
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if markup.DefaultProcessorHelper.ElementDir != "" {
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n.SetAttributeString("dir", []byte(markup.DefaultProcessorHelper.ElementDir))
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}
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}
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attentionMarkedBlockquotes := make(container.Set[*ast.Blockquote])
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_ = ast.Walk(node, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
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if !entering {
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return ast.WalkContinue, nil
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}
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switch v := n.(type) {
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case *ast.Heading:
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for _, attr := range v.Attributes() {
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if _, ok := attr.Value.([]byte); !ok {
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v.SetAttribute(attr.Name, []byte(fmt.Sprintf("%v", attr.Value)))
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}
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}
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txt := n.Text(reader.Source())
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header := markup.Header{
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Text: util.BytesToReadOnlyString(txt),
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Level: v.Level,
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}
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if id, found := v.AttributeString("id"); found {
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header.ID = util.BytesToReadOnlyString(id.([]byte))
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}
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tocList = append(tocList, header)
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applyElementDir(v)
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case *ast.Paragraph:
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applyElementDir(v)
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case *ast.Image:
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// Images need two things:
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//
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// 1. Their src needs to munged to be a real value
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// 2. If they're not wrapped with a link they need a link wrapper
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// Check if the destination is a real link
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link := v.Destination
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if len(link) > 0 && !markup.IsLink(link) {
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v.Destination = []byte(giteautil.URLJoin(ctx.Links.ResolveMediaLink(ctx.IsWiki), string(link)))
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}
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parent := n.Parent()
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// Create a link around image only if parent is not already a link
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if _, ok := parent.(*ast.Link); !ok && parent != nil {
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next := n.NextSibling()
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// Create a link wrapper
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wrap := ast.NewLink()
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wrap.Destination = v.Destination
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wrap.Title = v.Title
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wrap.SetAttributeString("target", []byte("_blank"))
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// Duplicate the current image node
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image := ast.NewImage(ast.NewLink())
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image.Destination = link
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image.Title = v.Title
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for _, attr := range v.Attributes() {
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image.SetAttribute(attr.Name, attr.Value)
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}
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for child := v.FirstChild(); child != nil; {
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next := child.NextSibling()
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image.AppendChild(image, child)
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child = next
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}
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// Append our duplicate image to the wrapper link
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wrap.AppendChild(wrap, image)
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// Wire in the next sibling
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wrap.SetNextSibling(next)
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// Replace the current node with the wrapper link
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parent.ReplaceChild(parent, n, wrap)
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// But most importantly ensure the next sibling is still on the old image too
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v.SetNextSibling(next)
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}
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case *ast.Link:
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// Links need their href to munged to be a real value
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link := v.Destination
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if len(link) > 0 && !markup.IsLink(link) &&
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link[0] != '#' && !bytes.HasPrefix(link, byteMailto) {
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// special case: this is not a link, a hash link or a mailto:, so it's a
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// relative URL
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var base string
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if ctx.IsWiki {
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base = ctx.Links.WikiLink()
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} else {
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base = ctx.Links.Base
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}
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link = []byte(giteautil.URLJoin(base, string(link)))
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}
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if len(link) > 0 && link[0] == '#' {
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link = []byte("#user-content-" + string(link)[1:])
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}
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v.Destination = link
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case *ast.List:
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if v.HasChildren() {
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children := make([]ast.Node, 0, v.ChildCount())
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child := v.FirstChild()
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for child != nil {
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children = append(children, child)
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child = child.NextSibling()
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}
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v.RemoveChildren(v)
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for _, child := range children {
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listItem := child.(*ast.ListItem)
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if !child.HasChildren() || !child.FirstChild().HasChildren() {
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v.AppendChild(v, child)
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continue
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}
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taskCheckBox, ok := child.FirstChild().FirstChild().(*east.TaskCheckBox)
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if !ok {
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v.AppendChild(v, child)
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continue
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}
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newChild := NewTaskCheckBoxListItem(listItem)
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newChild.IsChecked = taskCheckBox.IsChecked
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newChild.SetAttributeString("class", []byte("task-list-item"))
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segments := newChild.FirstChild().Lines()
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if segments.Len() > 0 {
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segment := segments.At(0)
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newChild.SourcePosition = rc.metaLength + segment.Start
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}
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v.AppendChild(v, newChild)
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}
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}
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applyElementDir(v)
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case *ast.Text:
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if v.SoftLineBreak() && !v.HardLineBreak() {
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if ctx.Metas["mode"] != "document" {
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v.SetHardLineBreak(setting.Markdown.EnableHardLineBreakInComments)
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} else {
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v.SetHardLineBreak(setting.Markdown.EnableHardLineBreakInDocuments)
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}
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}
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case *ast.CodeSpan:
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colorContent := n.Text(reader.Source())
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if css.ColorHandler(strings.ToLower(string(colorContent))) {
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v.AppendChild(v, NewColorPreview(colorContent))
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}
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case *ast.Emphasis:
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// check if inside blockquote for attention, expected hierarchy is
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// Emphasis < Paragraph < Blockquote
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blockquote, isInBlockquote := n.Parent().Parent().(*ast.Blockquote)
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if isInBlockquote && !attentionMarkedBlockquotes.Contains(blockquote) {
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fullText := string(n.Text(reader.Source()))
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if fullText == AttentionNote || fullText == AttentionWarning {
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v.SetAttributeString("class", []byte("attention-"+strings.ToLower(fullText)))
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v.Parent().InsertBefore(v.Parent(), v, NewAttention(fullText))
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attentionMarkedBlockquotes.Add(blockquote)
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}
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}
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}
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return ast.WalkContinue, nil
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})
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showTocInMain := tocMode == "true" /* old behavior, in main view */ || tocMode == "main"
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showTocInSidebar := !showTocInMain && tocMode != "false" // not hidden, not main, then show it in sidebar
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if len(tocList) > 0 && (showTocInMain || showTocInSidebar) {
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if showTocInMain {
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tocNode := createTOCNode(tocList, rc.Lang, nil)
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node.InsertBefore(node, firstChild, tocNode)
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} else {
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tocNode := createTOCNode(tocList, rc.Lang, map[string]string{"open": "open"})
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ctx.SidebarTocNode = tocNode
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}
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}
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if len(rc.Lang) > 0 {
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node.SetAttributeString("lang", []byte(rc.Lang))
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}
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}
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type prefixedIDs struct {
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values container.Set[string]
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}
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// Generate generates a new element id.
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func (p *prefixedIDs) Generate(value []byte, kind ast.NodeKind) []byte {
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dft := []byte("id")
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if kind == ast.KindHeading {
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dft = []byte("heading")
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}
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return p.GenerateWithDefault(value, dft)
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}
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// Generate generates a new element id.
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func (p *prefixedIDs) GenerateWithDefault(value, dft []byte) []byte {
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result := common.CleanValue(value)
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if len(result) == 0 {
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result = dft
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}
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if !bytes.HasPrefix(result, []byte("user-content-")) {
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result = append([]byte("user-content-"), result...)
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}
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if p.values.Add(util.BytesToReadOnlyString(result)) {
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return result
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}
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for i := 1; ; i++ {
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newResult := fmt.Sprintf("%s-%d", result, i)
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if p.values.Add(newResult) {
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return []byte(newResult)
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}
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}
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}
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// Put puts a given element id to the used ids table.
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func (p *prefixedIDs) Put(value []byte) {
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p.values.Add(util.BytesToReadOnlyString(value))
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}
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func newPrefixedIDs() *prefixedIDs {
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return &prefixedIDs{
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values: make(container.Set[string]),
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}
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}
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// NewHTMLRenderer creates a HTMLRenderer to render
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// in the gitea form.
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func NewHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {
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r := &HTMLRenderer{
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Config: html.NewConfig(),
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}
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for _, opt := range opts {
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opt.SetHTMLOption(&r.Config)
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}
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return r
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}
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// HTMLRenderer is a renderer.NodeRenderer implementation that
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// renders gitea specific features.
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type HTMLRenderer struct {
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html.Config
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}
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// RegisterFuncs implements renderer.NodeRenderer.RegisterFuncs.
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func (r *HTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
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reg.Register(ast.KindDocument, r.renderDocument)
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reg.Register(KindDetails, r.renderDetails)
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reg.Register(KindSummary, r.renderSummary)
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reg.Register(KindIcon, r.renderIcon)
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reg.Register(ast.KindCodeSpan, r.renderCodeSpan)
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reg.Register(KindAttention, r.renderAttention)
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reg.Register(KindTaskCheckBoxListItem, r.renderTaskCheckBoxListItem)
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reg.Register(east.KindTaskCheckBox, r.renderTaskCheckBox)
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}
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// renderCodeSpan renders CodeSpan elements (like goldmark upstream does) but also renders ColorPreview elements.
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// See #21474 for reference
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func (r *HTMLRenderer) renderCodeSpan(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
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if entering {
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if n.Attributes() != nil {
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_, _ = w.WriteString("<code")
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html.RenderAttributes(w, n, html.CodeAttributeFilter)
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_ = w.WriteByte('>')
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} else {
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_, _ = w.WriteString("<code>")
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}
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for c := n.FirstChild(); c != nil; c = c.NextSibling() {
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switch v := c.(type) {
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case *ast.Text:
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segment := v.Segment
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value := segment.Value(source)
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if bytes.HasSuffix(value, []byte("\n")) {
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r.Writer.RawWrite(w, value[:len(value)-1])
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r.Writer.RawWrite(w, []byte(" "))
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} else {
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r.Writer.RawWrite(w, value)
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}
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case *ColorPreview:
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_, _ = w.WriteString(fmt.Sprintf(`<span class="color-preview" style="background-color: %v"></span>`, string(v.Color)))
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}
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}
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return ast.WalkSkipChildren, nil
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}
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_, _ = w.WriteString("</code>")
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return ast.WalkContinue, nil
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}
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// renderAttention renders a quote marked with i.e. "> **Note**" or "> **Warning**" with a corresponding svg
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func (r *HTMLRenderer) renderAttention(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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if entering {
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_, _ = w.WriteString(`<span class="attention-icon attention-`)
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n := node.(*Attention)
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_, _ = w.WriteString(strings.ToLower(n.AttentionType))
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_, _ = w.WriteString(`">`)
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var octiconType string
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switch n.AttentionType {
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case AttentionNote:
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octiconType = "info"
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case AttentionWarning:
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octiconType = "alert"
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}
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_, _ = w.WriteString(string(svg.RenderHTML("octicon-" + octiconType)))
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} else {
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_, _ = w.WriteString("</span>\n")
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}
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return ast.WalkContinue, nil
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}
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func (r *HTMLRenderer) renderDocument(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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n := node.(*ast.Document)
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if val, has := n.AttributeString("lang"); has {
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var err error
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if entering {
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_, err = w.WriteString("<div")
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if err == nil {
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_, err = w.WriteString(fmt.Sprintf(` lang=%q`, val))
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}
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if err == nil {
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_, err = w.WriteRune('>')
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}
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} else {
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_, err = w.WriteString("</div>")
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}
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if err != nil {
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return ast.WalkStop, err
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}
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}
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return ast.WalkContinue, nil
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}
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func (r *HTMLRenderer) renderDetails(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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var err error
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if entering {
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if _, err = w.WriteString("<details"); err != nil {
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return ast.WalkStop, err
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}
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html.RenderAttributes(w, node, nil)
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_, err = w.WriteString(">")
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} else {
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_, err = w.WriteString("</details>")
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}
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if err != nil {
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return ast.WalkStop, err
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}
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return ast.WalkContinue, nil
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}
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func (r *HTMLRenderer) renderSummary(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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var err error
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if entering {
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_, err = w.WriteString("<summary>")
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} else {
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_, err = w.WriteString("</summary>")
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}
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if err != nil {
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return ast.WalkStop, err
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}
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return ast.WalkContinue, nil
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}
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var validNameRE = regexp.MustCompile("^[a-z ]+$")
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func (r *HTMLRenderer) renderIcon(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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if !entering {
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return ast.WalkContinue, nil
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}
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n := node.(*Icon)
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name := strings.TrimSpace(strings.ToLower(string(n.Name)))
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if len(name) == 0 {
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// skip this
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return ast.WalkContinue, nil
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}
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if !validNameRE.MatchString(name) {
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// skip this
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return ast.WalkContinue, nil
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}
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var err error
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_, err = w.WriteString(fmt.Sprintf(`<i class="icon %s"></i>`, name))
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if err != nil {
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return ast.WalkStop, err
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}
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return ast.WalkContinue, nil
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}
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func (r *HTMLRenderer) renderTaskCheckBoxListItem(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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n := node.(*TaskCheckBoxListItem)
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if entering {
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if n.Attributes() != nil {
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_, _ = w.WriteString("<li")
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html.RenderAttributes(w, n, html.ListItemAttributeFilter)
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_ = w.WriteByte('>')
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} else {
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_, _ = w.WriteString("<li>")
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}
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fmt.Fprintf(w, `<input type="checkbox" disabled="" data-source-position="%d"`, n.SourcePosition)
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if n.IsChecked {
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_, _ = w.WriteString(` checked=""`)
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}
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if r.XHTML {
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_, _ = w.WriteString(` />`)
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} else {
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_ = w.WriteByte('>')
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}
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fc := n.FirstChild()
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if fc != nil {
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if _, ok := fc.(*ast.TextBlock); !ok {
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_ = w.WriteByte('\n')
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}
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}
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} else {
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_, _ = w.WriteString("</li>\n")
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}
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return ast.WalkContinue, nil
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}
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func (r *HTMLRenderer) renderTaskCheckBox(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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return ast.WalkContinue, nil
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}
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