maubot/matrix/replyutil.go
2018-06-14 01:41:05 +03:00

108 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 (
"regexp"
"strings"
"fmt"
"maunium.net/go/gomatrix"
"golang.org/x/net/html"
)
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.Join(lines, "\n")
}
func RemoveReplyFallback(evt *gomatrix.Event) {
if format, ok := evt.Content["format"].(string); ok && format == "org.matrix.custom.html" {
htmlBody, _ := evt.Content["formatted_body"].(string)
evt.Content["formatted_body"] = TrimReplyFallbackHTML(htmlBody)
}
plainBody, _ := evt.Content["body"].(string)
evt.Content["body"] = TrimReplyFallbackText(plainBody)
}
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 map[string]interface{}, inReplyTo *gomatrix.Event) map[string]interface{} {
content["m.relates_to"] = map[string]interface{}{
"m.in_reply_to": map[string]interface{}{
"event_id": inReplyTo.ID,
"room_id": inReplyTo.RoomID,
},
}
body, _ := content["body"].(string)
content["body"] = ReplyFallbackText(inReplyTo) + body
htmlBody, ok := content["formatted_body"].(string)
if !ok {
htmlBody = html.EscapeString(body)
content["format"] = "org.matrix.custom.html"
}
content["formatted_body"] = ReplyFallbackHTML(inReplyTo) + htmlBody
return content
}