106 lines
3.0 KiB
Go
106 lines
3.0 KiB
Go
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// 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 event
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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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"maunium.net/go/mautrix/id"
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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 (content *MessageEventContent) RemoveReplyFallback() {
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if len(content.GetReplyTo()) > 0 && !content.replyFallbackRemoved {
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if content.Format == FormatHTML {
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content.FormattedBody = TrimReplyFallbackHTML(content.FormattedBody)
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}
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content.Body = TrimReplyFallbackText(content.Body)
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content.replyFallbackRemoved = true
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}
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}
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func (content *MessageEventContent) GetReplyTo() id.EventID {
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if content.RelatesTo != nil && content.RelatesTo.Type == RelReply {
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return content.RelatesTo.EventID
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}
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return ""
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}
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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>`
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func (evt *Event) GenerateReplyFallbackHTML() string {
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parsedContent, ok := evt.Content.Parsed.(*MessageEventContent)
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if !ok {
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return ""
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}
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parsedContent.RemoveReplyFallback()
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body := parsedContent.FormattedBody
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if len(body) == 0 {
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body = strings.ReplaceAll(html.EscapeString(parsedContent.Body), "\n", "<br/>")
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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 (evt *Event) GenerateReplyFallbackText() string {
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parsedContent, ok := evt.Content.Parsed.(*MessageEventContent)
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if !ok {
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return ""
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}
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parsedContent.RemoveReplyFallback()
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body := parsedContent.Body
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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 (content *MessageEventContent) SetReply(inReplyTo *Event) {
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content.RelatesTo = &RelatesTo{
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EventID: inReplyTo.ID,
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Type: RelReply,
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}
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if content.MsgType == MsgText || content.MsgType == MsgNotice {
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content.EnsureHasHTML()
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content.FormattedBody = inReplyTo.GenerateReplyFallbackHTML() + content.FormattedBody
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content.Body = inReplyTo.GenerateReplyFallbackText() + content.Body
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content.replyFallbackRemoved = false
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}
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}
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