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forgejo/modules/markup/orgmode/orgmode.go
KN4CK3R 637451a45e
Rework markup link rendering (#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](https://github.com/go-gitea/gitea/assets/1666336/109ae422-496d-4200-b52e-b3a528f553e5)

</details>

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
2024-01-15 08:49:24 +00:00

182 lines
4.7 KiB
Go

// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package markup
import (
"fmt"
"html"
"io"
"strings"
"code.gitea.io/gitea/modules/highlight"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/markup"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
"github.com/alecthomas/chroma/v2"
"github.com/alecthomas/chroma/v2/lexers"
"github.com/niklasfasching/go-org/org"
)
func init() {
markup.RegisterRenderer(Renderer{})
}
// Renderer implements markup.Renderer for orgmode
type Renderer struct{}
var _ markup.PostProcessRenderer = (*Renderer)(nil)
// Name implements markup.Renderer
func (Renderer) Name() string {
return "orgmode"
}
// NeedPostProcess implements markup.PostProcessRenderer
func (Renderer) NeedPostProcess() bool { return true }
// Extensions implements markup.Renderer
func (Renderer) Extensions() []string {
return []string{".org"}
}
// SanitizerRules implements markup.Renderer
func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
return []setting.MarkupSanitizerRule{}
}
// Render renders orgmode rawbytes to HTML
func Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
htmlWriter := org.NewHTMLWriter()
htmlWriter.HighlightCodeBlock = func(source, lang string, inline bool, params map[string]string) string {
defer func() {
if err := recover(); err != nil {
log.Error("Panic in HighlightCodeBlock: %v\n%s", err, log.Stack(2))
panic(err)
}
}()
var w strings.Builder
if _, err := w.WriteString(`<pre>`); err != nil {
return ""
}
lexer := lexers.Get(lang)
if lexer == nil && lang == "" {
lexer = lexers.Analyse(source)
if lexer == nil {
lexer = lexers.Fallback
}
lang = strings.ToLower(lexer.Config().Name)
}
if lexer == nil {
// include language-x class as part of commonmark spec
if _, err := w.WriteString(`<code class="chroma language-` + lang + `">`); err != nil {
return ""
}
if _, err := w.WriteString(html.EscapeString(source)); err != nil {
return ""
}
} else {
// include language-x class as part of commonmark spec
if _, err := w.WriteString(`<code class="chroma language-` + lang + `">`); err != nil {
return ""
}
lexer = chroma.Coalesce(lexer)
if _, err := w.WriteString(string(highlight.CodeFromLexer(lexer, source))); err != nil {
return ""
}
}
if _, err := w.WriteString("</code></pre>"); err != nil {
return ""
}
return w.String()
}
w := &Writer{
HTMLWriter: htmlWriter,
Ctx: ctx,
}
htmlWriter.ExtendingWriter = w
res, err := org.New().Silent().Parse(input, "").Write(w)
if err != nil {
return fmt.Errorf("orgmode.Render failed: %w", err)
}
_, err = io.Copy(output, strings.NewReader(res))
return err
}
// RenderString renders orgmode string to HTML string
func RenderString(ctx *markup.RenderContext, content string) (string, error) {
var buf strings.Builder
if err := Render(ctx, strings.NewReader(content), &buf); err != nil {
return "", err
}
return buf.String(), nil
}
// Render renders orgmode string to HTML string
func (Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
return Render(ctx, input, output)
}
// Writer implements org.Writer
type Writer struct {
*org.HTMLWriter
Ctx *markup.RenderContext
}
const mailto = "mailto:"
func (r *Writer) resolveLink(l org.RegularLink) string {
link := html.EscapeString(l.URL)
if l.Protocol == "file" {
link = link[len("file:"):]
}
if len(link) > 0 && !markup.IsLinkStr(link) &&
link[0] != '#' && !strings.HasPrefix(link, mailto) {
base := r.Ctx.Links.Base
switch l.Kind() {
case "image", "video":
base = r.Ctx.Links.ResolveMediaLink(r.Ctx.IsWiki)
}
link = util.URLJoin(base, link)
}
return link
}
// WriteRegularLink renders images, links or videos
func (r *Writer) WriteRegularLink(l org.RegularLink) {
link := r.resolveLink(l)
// Inspired by https://github.com/niklasfasching/go-org/blob/6eb20dbda93cb88c3503f7508dc78cbbc639378f/org/html_writer.go#L406-L427
switch l.Kind() {
case "image":
if l.Description == nil {
fmt.Fprintf(r, `<img src="%s" alt="%s" />`, link, link)
} else {
imageSrc := r.resolveLink(l.Description[0].(org.RegularLink))
fmt.Fprintf(r, `<a href="%s"><img src="%s" alt="%s" /></a>`, link, imageSrc, imageSrc)
}
case "video":
if l.Description == nil {
fmt.Fprintf(r, `<video src="%s">%s</video>`, link, link)
} else {
videoSrc := r.resolveLink(l.Description[0].(org.RegularLink))
fmt.Fprintf(r, `<a href="%s"><video src="%s">%s</video></a>`, link, videoSrc, videoSrc)
}
default:
description := link
if l.Description != nil {
description = r.WriteNodesAsString(l.Description...)
}
fmt.Fprintf(r, `<a href="%s">%s</a>`, link, description)
}
}