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// Copyright 2018 Tulir Asokan
package mautrix
import (
"fmt"
"regexp"
"strings"
"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.TrimSpace(strings.Join(lines, "\n"))
}
func (content *Content) RemoveReplyFallback() {
if len(content.GetReplyTo()) > 0 {
if content.Format == FormatHTML {
content.FormattedBody = TrimReplyFallbackHTML(content.FormattedBody)
}
content.Body = TrimReplyFallbackText(content.Body)
}
}
func (content *Content) GetReplyTo() string {
if content.RelatesTo != nil {
return content.RelatesTo.InReplyTo.EventID
}
return ""
}
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 (evt *Event) GenerateReplyFallbackHTML() string {
body := evt.Content.FormattedBody
if len(body) == 0 {
body = html.EscapeString(evt.Content.Body)
}
senderDisplayName := evt.Sender
return fmt.Sprintf(ReplyFormat, evt.RoomID, evt.ID, evt.Sender, senderDisplayName, body)
}
func (evt *Event) GenerateReplyFallbackText() string {
body := evt.Content.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 *Content) SetReply(inReplyTo *Event) {
if content.RelatesTo == nil {
content.RelatesTo = &RelatesTo{}
}
content.RelatesTo.InReplyTo = InReplyTo{
EventID: inReplyTo.ID,
RoomID: inReplyTo.RoomID,
}
if content.MsgType == MsgText || content.MsgType == MsgNotice {
if len(content.FormattedBody) == 0 || content.Format != FormatHTML {
content.FormattedBody = html.EscapeString(content.Body)
content.Format = FormatHTML
}
content.FormattedBody = inReplyTo.GenerateReplyFallbackHTML() + content.FormattedBody
content.Body = inReplyTo.GenerateReplyFallbackText() + content.Body
}
}
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