mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-22 19:56:39 +00:00
116 lines
3.7 KiB
Go
116 lines
3.7 KiB
Go
/*
|
|
GoToSocial
|
|
Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Affero General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Affero General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Affero General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
package text
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"io"
|
|
"strings"
|
|
|
|
"github.com/russross/blackfriday/v2"
|
|
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
|
|
"github.com/superseriousbusiness/gotosocial/internal/log"
|
|
"github.com/tdewolff/minify/v2"
|
|
"github.com/tdewolff/minify/v2/html"
|
|
)
|
|
|
|
var (
|
|
bfExtensions = blackfriday.NoIntraEmphasis | blackfriday.FencedCode | blackfriday.Autolink | blackfriday.Strikethrough | blackfriday.SpaceHeadings | blackfriday.HardLineBreak
|
|
m *minify.M
|
|
)
|
|
|
|
type renderer struct {
|
|
f *formatter
|
|
ctx context.Context
|
|
mentions []*gtsmodel.Mention
|
|
tags []*gtsmodel.Tag
|
|
blackfriday.HTMLRenderer
|
|
}
|
|
|
|
func (r *renderer) RenderNode(w io.Writer, node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
|
|
if node.Type == blackfriday.Text {
|
|
// call RenderNode to do the html escaping
|
|
var buff bytes.Buffer
|
|
status := r.HTMLRenderer.RenderNode(&buff, node, entering)
|
|
|
|
html := buff.String()
|
|
html = r.f.ReplaceTags(r.ctx, html, r.tags)
|
|
html = r.f.ReplaceMentions(r.ctx, html, r.mentions)
|
|
|
|
// we don't have much recourse if this fails
|
|
if _, err := io.WriteString(w, html); err != nil {
|
|
log.Errorf("error outputting markdown text: %s", err)
|
|
}
|
|
return status
|
|
}
|
|
return r.HTMLRenderer.RenderNode(w, node, entering)
|
|
}
|
|
|
|
func (f *formatter) FromMarkdown(ctx context.Context, markdownText string, mentions []*gtsmodel.Mention, tags []*gtsmodel.Tag, emojis []*gtsmodel.Emoji) string {
|
|
|
|
renderer := &renderer{
|
|
f: f,
|
|
ctx: ctx,
|
|
mentions: mentions,
|
|
tags: tags,
|
|
HTMLRenderer: *blackfriday.NewHTMLRenderer(blackfriday.HTMLRendererParameters{
|
|
Flags: blackfriday.CommonHTMLFlags,
|
|
}),
|
|
}
|
|
|
|
// Temporarily replace all found emoji shortcodes in the markdown text with
|
|
// their ID so that they're not parsed as anything by the markdown parser -
|
|
// this fixes cases where emojis with some underscores in them are parsed as
|
|
// words with emphasis, eg `:_some_emoji:` becomes `:<em>some</em>emoji:`
|
|
//
|
|
// Since the IDs of the emojis are just uppercase letters + numbers they should
|
|
// be safe to pass through the markdown parser without unexpected effects.
|
|
for _, e := range emojis {
|
|
markdownText = strings.ReplaceAll(markdownText, ":"+e.Shortcode+":", ":"+e.ID+":")
|
|
}
|
|
|
|
// parse markdown text into html, using custom renderer to add hashtag/mention links
|
|
htmlContentBytes := blackfriday.Run([]byte(markdownText), blackfriday.WithExtensions(bfExtensions), blackfriday.WithRenderer(renderer))
|
|
htmlContent := string(htmlContentBytes)
|
|
|
|
// Replace emoji IDs in the parsed html content with their shortcodes again
|
|
for _, e := range emojis {
|
|
htmlContent = strings.ReplaceAll(htmlContent, ":"+e.ID+":", ":"+e.Shortcode+":")
|
|
}
|
|
|
|
// clean anything dangerous out of the html
|
|
htmlContent = SanitizeHTML(htmlContent)
|
|
|
|
if m == nil {
|
|
m = minify.New()
|
|
m.Add("text/html", &html.Minifier{
|
|
KeepEndTags: true,
|
|
KeepQuotes: true,
|
|
})
|
|
}
|
|
|
|
minified, err := m.String("text/html", htmlContent)
|
|
if err != nil {
|
|
log.Errorf("error minifying markdown text: %s", err)
|
|
}
|
|
|
|
return minified
|
|
}
|