gotosocial/internal/text/markdown.go

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/*
GoToSocial
Copyright (C) 2021-2023 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"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/extension"
"github.com/yuin/goldmark/renderer/html"
)
func (f *formatter) FromMarkdown(ctx context.Context, pmf gtsmodel.ParseMentionFunc, authorID string, statusID string, markdownText string) *FormatResult {
result := &FormatResult{
Mentions: []*gtsmodel.Mention{},
Tags: []*gtsmodel.Tag{},
Emojis: []*gtsmodel.Emoji{},
}
// parse markdown text into html, using custom renderer to add hashtag/mention links
md := goldmark.New(
goldmark.WithRendererOptions(
html.WithXHTML(),
html.WithHardWraps(),
html.WithUnsafe(), // allows raw HTML
),
goldmark.WithExtensions(
&customRenderer{f, ctx, pmf, authorID, statusID, false, result},
extension.Linkify, // turns URLs into links
extension.Strikethrough,
),
)
var htmlContentBytes bytes.Buffer
err := md.Convert([]byte(markdownText), &htmlContentBytes)
if err != nil {
log.Errorf(ctx, "error formatting markdown to HTML: %s", err)
}
result.HTML = htmlContentBytes.String()
// clean anything dangerous out of the HTML
result.HTML = SanitizeHTML(result.HTML)
// shrink ray
result.HTML, err = m.String("text/html", result.HTML)
if err != nil {
log.Errorf(ctx, "error minifying HTML: %s", err)
}
return result
}