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268 lines
7.1 KiB
268 lines
7.1 KiB
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Copyright 2018 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package markdown
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import (
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"fmt"
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"io"
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"strings"
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"sync"
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"code.gitea.io/gitea/modules/log"
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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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giteautil "code.gitea.io/gitea/modules/util"
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chromahtml "github.com/alecthomas/chroma/formatters/html"
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"github.com/yuin/goldmark"
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highlighting "github.com/yuin/goldmark-highlighting"
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meta "github.com/yuin/goldmark-meta"
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"github.com/yuin/goldmark/extension"
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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/util"
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)
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var converter goldmark.Markdown
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var once = sync.Once{}
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var urlPrefixKey = parser.NewContextKey()
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var isWikiKey = parser.NewContextKey()
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var renderMetasKey = parser.NewContextKey()
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type closesWithError interface {
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io.WriteCloser
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CloseWithError(err error) error
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}
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type limitWriter struct {
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w closesWithError
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sum int64
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limit int64
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}
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// Write implements the standard Write interface:
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func (l *limitWriter) Write(data []byte) (int, error) {
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leftToWrite := l.limit - l.sum
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if leftToWrite < int64(len(data)) {
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n, err := l.w.Write(data[:leftToWrite])
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l.sum += int64(n)
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if err != nil {
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return n, err
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}
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_ = l.w.Close()
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return n, fmt.Errorf("Rendered content too large - truncating render")
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}
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n, err := l.w.Write(data)
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l.sum += int64(n)
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return n, err
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}
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// Close closes the writer
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func (l *limitWriter) Close() error {
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return l.w.Close()
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}
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// CloseWithError closes the writer
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func (l *limitWriter) CloseWithError(err error) error {
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return l.w.CloseWithError(err)
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}
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// NewGiteaParseContext creates a parser.Context with the gitea context set
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func NewGiteaParseContext(urlPrefix string, metas map[string]string, isWiki bool) parser.Context {
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pc := parser.NewContext(parser.WithIDs(newPrefixedIDs()))
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pc.Set(urlPrefixKey, urlPrefix)
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pc.Set(isWikiKey, isWiki)
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pc.Set(renderMetasKey, metas)
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return pc
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}
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// actualRender renders Markdown to HTML without handling special links.
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func actualRender(body []byte, urlPrefix string, metas map[string]string, wikiMarkdown bool) []byte {
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once.Do(func() {
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converter = goldmark.New(
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goldmark.WithExtensions(extension.Table,
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extension.Strikethrough,
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extension.TaskList,
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extension.DefinitionList,
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common.FootnoteExtension,
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highlighting.NewHighlighting(
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highlighting.WithFormatOptions(
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chromahtml.WithClasses(true),
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chromahtml.PreventSurroundingPre(true),
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),
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highlighting.WithWrapperRenderer(func(w util.BufWriter, c highlighting.CodeBlockContext, entering bool) {
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if entering {
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language, _ := c.Language()
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if language == nil {
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language = []byte("text")
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}
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languageStr := string(language)
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preClasses := []string{}
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if languageStr == "mermaid" {
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preClasses = append(preClasses, "is-loading")
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}
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if len(preClasses) > 0 {
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_, err := w.WriteString(`<pre class="` + strings.Join(preClasses, " ") + `">`)
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if err != nil {
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return
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}
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} else {
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_, err := w.WriteString(`<pre>`)
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if err != nil {
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return
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}
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}
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// include language-x class as part of commonmark spec
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_, err := w.WriteString(`<code class="chroma language-` + string(language) + `">`)
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if err != nil {
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return
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}
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} else {
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_, err := w.WriteString("</code></pre>")
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if err != nil {
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return
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}
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}
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}),
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),
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meta.Meta,
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),
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goldmark.WithParserOptions(
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parser.WithAttribute(),
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parser.WithAutoHeadingID(),
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parser.WithASTTransformers(
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util.Prioritized(&ASTTransformer{}, 10000),
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),
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),
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goldmark.WithRendererOptions(
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html.WithUnsafe(),
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),
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)
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// Override the original Tasklist renderer!
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converter.Renderer().AddOptions(
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renderer.WithNodeRenderers(
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util.Prioritized(NewHTMLRenderer(), 10),
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),
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)
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})
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rd, wr := io.Pipe()
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defer func() {
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_ = rd.Close()
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_ = wr.Close()
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}()
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lw := &limitWriter{
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w: wr,
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limit: setting.UI.MaxDisplayFileSize * 3,
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}
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// FIXME: should we include a timeout that closes the pipe to abort the parser and sanitizer if it takes too long?
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go func() {
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defer func() {
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err := recover()
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if err == nil {
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return
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}
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log.Warn("Unable to render markdown due to panic in goldmark: %v", err)
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if log.IsDebug() {
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log.Debug("Panic in markdown: %v\n%s", err, string(log.Stack(2)))
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}
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_ = lw.CloseWithError(fmt.Errorf("%v", err))
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}()
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pc := NewGiteaParseContext(urlPrefix, metas, wikiMarkdown)
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if err := converter.Convert(giteautil.NormalizeEOL(body), lw, parser.WithContext(pc)); err != nil {
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log.Error("Unable to render: %v", err)
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_ = lw.CloseWithError(err)
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return
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}
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_ = lw.Close()
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}()
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return markup.SanitizeReader(rd).Bytes()
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}
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func render(body []byte, urlPrefix string, metas map[string]string, wikiMarkdown bool) (ret []byte) {
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defer func() {
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err := recover()
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if err == nil {
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return
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}
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log.Warn("Unable to render markdown due to panic in goldmark - will return sanitized raw bytes")
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if log.IsDebug() {
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log.Debug("Panic in markdown: %v\n%s", err, string(log.Stack(2)))
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}
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ret = markup.SanitizeBytes(body)
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}()
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return actualRender(body, urlPrefix, metas, wikiMarkdown)
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}
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var (
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// MarkupName describes markup's name
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MarkupName = "markdown"
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)
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func init() {
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markup.RegisterParser(Parser{})
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}
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// Parser implements markup.Parser
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type Parser struct{}
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// Name implements markup.Parser
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func (Parser) Name() string {
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return MarkupName
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}
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// NeedPostProcess implements markup.Parser
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func (Parser) NeedPostProcess() bool { return true }
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// Extensions implements markup.Parser
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func (Parser) Extensions() []string {
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return setting.Markdown.FileExtensions
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}
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// Render implements markup.Parser
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func (Parser) Render(rawBytes []byte, urlPrefix string, metas map[string]string, isWiki bool) []byte {
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return render(rawBytes, urlPrefix, metas, isWiki)
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}
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// Render renders Markdown to HTML with all specific handling stuff.
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func Render(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
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return markup.Render("a.md", rawBytes, urlPrefix, metas)
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}
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// RenderRaw renders Markdown to HTML without handling special links.
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func RenderRaw(body []byte, urlPrefix string, wikiMarkdown bool) []byte {
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return render(body, urlPrefix, map[string]string{}, wikiMarkdown)
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}
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// RenderString renders Markdown to HTML with special links and returns string type.
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func RenderString(raw, urlPrefix string, metas map[string]string) string {
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return markup.RenderString("a.md", raw, urlPrefix, metas)
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}
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// RenderWiki renders markdown wiki page to HTML and return HTML string
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func RenderWiki(rawBytes []byte, urlPrefix string, metas map[string]string) string {
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return markup.RenderWiki("a.md", rawBytes, urlPrefix, metas)
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}
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// IsMarkdownFile reports whether name looks like a Markdown file
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// based on its extension.
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func IsMarkdownFile(name string) bool {
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return markup.IsMarkupFile(name, MarkupName)
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}
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