96 lines
3.0 KiB
Go
96 lines
3.0 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package text
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import (
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"bytes"
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"context"
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"strings"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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"github.com/tdewolff/minify/v2"
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minifyHtml "github.com/tdewolff/minify/v2/html"
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"github.com/yuin/goldmark"
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"github.com/yuin/goldmark/extension"
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"github.com/yuin/goldmark/renderer/html"
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)
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var (
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m *minify.M
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)
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func (f *formatter) FromMarkdown(ctx context.Context, markdownText string, mentions []*gtsmodel.Mention, tags []*gtsmodel.Tag, emojis []*gtsmodel.Emoji) string {
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// Temporarily replace all found emoji shortcodes in the markdown text with
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// their ID so that they're not parsed as anything by the markdown parser -
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// this fixes cases where emojis with some underscores in them are parsed as
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// words with emphasis, eg `:_some_emoji:` becomes `:<em>some</em>emoji:`
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//
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// Since the IDs of the emojis are just uppercase letters + numbers they should
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// be safe to pass through the markdown parser without unexpected effects.
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for _, e := range emojis {
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markdownText = strings.ReplaceAll(markdownText, ":"+e.Shortcode+":", ":"+e.ID+":")
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}
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// parse markdown text into html, using custom renderer to add hashtag/mention links
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md := goldmark.New(
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goldmark.WithRendererOptions(
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html.WithXHTML(),
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html.WithHardWraps(),
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html.WithUnsafe(), // allows raw HTML
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),
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goldmark.WithExtensions(
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&customRenderer{f, ctx, mentions, tags},
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extension.Linkify, // turns URLs into links
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extension.Strikethrough,
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),
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)
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var htmlContentBytes bytes.Buffer
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err := md.Convert([]byte(markdownText), &htmlContentBytes)
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if err != nil {
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log.Errorf("error rendering markdown to HTML: %s", err)
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}
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htmlContent := htmlContentBytes.String()
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// Replace emoji IDs in the parsed html content with their shortcodes again
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for _, e := range emojis {
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htmlContent = strings.ReplaceAll(htmlContent, ":"+e.ID+":", ":"+e.Shortcode+":")
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}
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// clean anything dangerous out of the html
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htmlContent = SanitizeHTML(htmlContent)
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if m == nil {
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m = minify.New()
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m.Add("text/html", &minifyHtml.Minifier{
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KeepEndTags: true,
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KeepQuotes: true,
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})
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}
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minified, err := m.String("text/html", htmlContent)
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if err != nil {
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log.Errorf("error minifying markdown text: %s", err)
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}
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return minified
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}
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