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76 lines
2 KiB
Go
76 lines
2 KiB
Go
// Copyright (c) 2020 Tulir Asokan
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package format
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import (
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"io"
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"regexp"
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"strings"
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"github.com/russross/blackfriday/v2"
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"maunium.net/go/mautrix/event"
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)
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type EscapingRenderer struct {
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*blackfriday.HTMLRenderer
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}
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func (r *EscapingRenderer) RenderNode(w io.Writer, node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
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if node.Type == blackfriday.HTMLSpan {
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node.Type = blackfriday.Text
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}
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return r.HTMLRenderer.RenderNode(w, node, entering)
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}
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var AntiParagraphRegex = regexp.MustCompile("^<p>(.+?)</p>$")
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var Extensions = blackfriday.WithExtensions(blackfriday.NoIntraEmphasis |
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blackfriday.Tables |
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blackfriday.FencedCode |
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blackfriday.Strikethrough |
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blackfriday.SpaceHeadings |
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blackfriday.DefinitionLists |
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blackfriday.HardLineBreak)
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var bfhtml = blackfriday.NewHTMLRenderer(blackfriday.HTMLRendererParameters{
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Flags: blackfriday.UseXHTML,
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})
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var Renderer = blackfriday.WithRenderer(bfhtml)
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var NoHTMLRenderer = blackfriday.WithRenderer(&EscapingRenderer{bfhtml})
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func RenderMarkdown(text string, allowMarkdown, allowHTML bool) event.MessageEventContent {
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var htmlBody string
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if allowMarkdown {
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renderer := Renderer
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if !allowHTML {
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renderer = NoHTMLRenderer
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}
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htmlBodyBytes := blackfriday.Run([]byte(text), Extensions, renderer)
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htmlBody = strings.TrimRight(string(htmlBodyBytes), "\n")
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htmlBody = AntiParagraphRegex.ReplaceAllString(htmlBody, "$1")
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} else {
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htmlBody = strings.Replace(text, "\n", "<br>", -1)
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}
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if len(htmlBody) > 0 && (allowMarkdown || allowHTML) {
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text = HTMLToText(htmlBody)
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if htmlBody != text {
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return event.MessageEventContent{
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FormattedBody: htmlBody,
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Format: event.FormatHTML,
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MsgType: event.MsgText,
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Body: text,
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}
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}
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}
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return event.MessageEventContent{
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MsgType: event.MsgText,
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Body: text,
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}
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}
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