105 lines
3.2 KiB
Go
105 lines
3.2 KiB
Go
// maubot - A plugin-based Matrix bot system written in Go.
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// Copyright (C) 2018 Tulir Asokan
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//
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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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//
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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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//
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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 <https://www.gnu.org/licenses/>.
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package matrix
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import (
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"fmt"
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"regexp"
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"strings"
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"golang.org/x/net/html"
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"maubot.xyz"
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"maunium.net/go/gomatrix"
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)
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var HTMLReplyFallbackRegex = regexp.MustCompile(`^<mx-reply>[\s\S]+?</mx-reply>`)
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func TrimReplyFallbackHTML(html string) string {
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return HTMLReplyFallbackRegex.ReplaceAllString(html, "")
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}
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func TrimReplyFallbackText(text string) string {
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if !strings.HasPrefix(text, "> ") || !strings.Contains(text, "\n") {
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return text
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}
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lines := strings.Split(text, "\n")
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for len(lines) > 0 && strings.HasPrefix(lines[0], "> ") {
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lines = lines[1:]
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}
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return strings.TrimSpace(strings.Join(lines, "\n"))
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}
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func RemoveReplyFallback(evt *maubot.Event) {
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if len(evt.Content.RelatesTo.InReplyTo.EventID) > 0 {
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if evt.Content.Format == maubot.FormatHTML {
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evt.Content.FormattedBody = TrimReplyFallbackHTML(evt.Content.FormattedBody)
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}
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evt.Content.Body = TrimReplyFallbackText(evt.Content.Body)
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}
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}
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const ReplyFormat = `<mx-reply><blockquote>
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<a href="https://matrix.to/#/%s/%s">In reply to</a>
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<a href="https://matrix.to/#/%s">%s</a>
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%s
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</blockquote></mx-reply>
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`
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func ReplyFallbackHTML(evt *gomatrix.Event) string {
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body, ok := evt.Content["formatted_body"].(string)
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if !ok {
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body, _ = evt.Content["body"].(string)
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body = html.EscapeString(body)
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}
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senderDisplayName := evt.Sender
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return fmt.Sprintf(ReplyFormat, evt.RoomID, evt.ID, evt.Sender, senderDisplayName, body)
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}
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func ReplyFallbackText(evt *gomatrix.Event) string {
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body, _ := evt.Content["body"].(string)
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lines := strings.Split(strings.TrimSpace(body), "\n")
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firstLine, lines := lines[0], lines[1:]
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senderDisplayName := evt.Sender
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var fallbackText strings.Builder
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fmt.Fprintf(&fallbackText, "> <%s> %s", senderDisplayName, firstLine)
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for _, line := range lines {
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fmt.Fprintf(&fallbackText, "\n> %s", line)
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}
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fallbackText.WriteString("\n\n")
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return fallbackText.String()
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}
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func SetReply(content maubot.Content, inReplyTo *gomatrix.Event) maubot.Content {
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content.RelatesTo.InReplyTo.EventID = inReplyTo.ID
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content.RelatesTo.InReplyTo.RoomID = inReplyTo.RoomID
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if content.MsgType == maubot.MsgText || content.MsgType == maubot.MsgNotice {
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if len(content.FormattedBody) == 0 || content.Format != maubot.FormatHTML {
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content.FormattedBody = html.EscapeString(content.Body)
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content.Format = maubot.FormatHTML
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}
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content.FormattedBody = ReplyFallbackHTML(inReplyTo) + content.FormattedBody
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content.Body = ReplyFallbackText(inReplyTo) + content.Body
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}
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return content
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}
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