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// Copyright (c) 2020 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package event
import (
"fmt"
"regexp"
"strings"
"golang.org/x/net/html"
"maunium.net/go/mautrix/id"
)
var HTMLReplyFallbackRegex = regexp.MustCompile(`^<mx-reply>[\s\S]+?</mx-reply>`)
func TrimReplyFallbackHTML(html string) string {
return HTMLReplyFallbackRegex.ReplaceAllString(html, "")
}
func TrimReplyFallbackText(text string) string {
if !strings.HasPrefix(text, "> ") || !strings.Contains(text, "\n") {
return text
}
lines := strings.Split(text, "\n")
for len(lines) > 0 && strings.HasPrefix(lines[0], "> ") {
lines = lines[1:]
}
return strings.TrimSpace(strings.Join(lines, "\n"))
}
func (content *MessageEventContent) RemoveReplyFallback() {
if len(content.RelatesTo.GetReplyTo()) > 0 && !content.replyFallbackRemoved {
if content.Format == FormatHTML {
content.FormattedBody = TrimReplyFallbackHTML(content.FormattedBody)
}
content.Body = TrimReplyFallbackText(content.Body)
content.replyFallbackRemoved = true
}
}
// Deprecated: RelatesTo methods are nil-safe, so RelatesTo.GetReplyTo can be used directly
func (content *MessageEventContent) GetReplyTo() id.EventID {
return content.RelatesTo.GetReplyTo()
}
const ReplyFormat = `<mx-reply><blockquote><a href="https://matrix.to/#/%s/%s">In reply to</a> <a href="https://matrix.to/#/%s">%s</a><br>%s</blockquote></mx-reply>`
func (evt *Event) GenerateReplyFallbackHTML() string {
parsedContent, ok := evt.Content.Parsed.(*MessageEventContent)
if !ok {
return ""
}
parsedContent.RemoveReplyFallback()
body := parsedContent.FormattedBody
if len(body) == 0 {
body = strings.ReplaceAll(html.EscapeString(parsedContent.Body), "\n", "<br/>")
}
senderDisplayName := evt.Sender
return fmt.Sprintf(ReplyFormat, evt.RoomID, evt.ID, evt.Sender, senderDisplayName, body)
}
func (evt *Event) GenerateReplyFallbackText() string {
parsedContent, ok := evt.Content.Parsed.(*MessageEventContent)
if !ok {
return ""
}
parsedContent.RemoveReplyFallback()
body := parsedContent.Body
lines := strings.Split(strings.TrimSpace(body), "\n")
firstLine, lines := lines[0], lines[1:]
senderDisplayName := evt.Sender
var fallbackText strings.Builder
_, _ = fmt.Fprintf(&fallbackText, "> <%s> %s", senderDisplayName, firstLine)
for _, line := range lines {
_, _ = fmt.Fprintf(&fallbackText, "\n> %s", line)
}
fallbackText.WriteString("\n\n")
return fallbackText.String()
}
func (content *MessageEventContent) SetReply(inReplyTo *Event) {
content.RelatesTo = (&RelatesTo{}).SetReplyTo(inReplyTo.ID)
if content.MsgType == MsgText || content.MsgType == MsgNotice {
content.EnsureHasHTML()
content.FormattedBody = inReplyTo.GenerateReplyFallbackHTML() + content.FormattedBody
content.Body = inReplyTo.GenerateReplyFallbackText() + content.Body
content.replyFallbackRemoved = false
}
}
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