maubot/matrix/replyutil.go
2018-06-14 13:36:53 +03:00

106 lines
3.2 KiB
Go

// maubot - A plugin-based Matrix bot system written in Go.
// Copyright (C) 2018 Tulir Asokan
//
// 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 <https://www.gnu.org/licenses/>.
package matrix
import (
"fmt"
"regexp"
"strings"
"golang.org/x/net/html"
"maubot.xyz"
"maunium.net/go/gomatrix"
)
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 RemoveReplyFallback(evt *maubot.Event) {
if len(evt.Content.RelatesTo.InReplyTo.EventID) > 0 {
if evt.Content.Format == maubot.FormatHTML {
evt.Content.FormattedBody = TrimReplyFallbackHTML(evt.Content.FormattedBody)
}
evt.Content.Body = TrimReplyFallbackText(evt.Content.Body)
}
}
const ReplyFormat = `<mx-reply><blockquote>
<a href="https://matrix.to/#/%s/%s">In reply to</a>
<a href="https://matrix.to/#/%s">%s</a>
%s
</blockquote></mx-reply>
`
func ReplyFallbackHTML(evt *gomatrix.Event) string {
body, ok := evt.Content["formatted_body"].(string)
if !ok {
body, _ = evt.Content["body"].(string)
body = html.EscapeString(body)
}
senderDisplayName := evt.Sender
return fmt.Sprintf(ReplyFormat, evt.RoomID, evt.ID, evt.Sender, senderDisplayName, body)
}
func ReplyFallbackText(evt *gomatrix.Event) string {
body, _ := evt.Content["body"].(string)
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 SetReply(content maubot.Content, inReplyTo *gomatrix.Event) maubot.Content {
content.RelatesTo.InReplyTo.EventID = inReplyTo.ID
content.RelatesTo.InReplyTo.RoomID = inReplyTo.RoomID
if content.MsgType == maubot.MsgText || content.MsgType == maubot.MsgNotice {
if len(content.FormattedBody) == 0 || content.Format != maubot.FormatHTML {
content.FormattedBody = html.EscapeString(content.Body)
content.Format = maubot.FormatHTML
}
content.FormattedBody = ReplyFallbackHTML(inReplyTo) + content.FormattedBody
content.Body = ReplyFallbackText(inReplyTo) + content.Body
}
return content
}