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use std::fmt::{self, Write};
use super::{
sanitize::remove_plain_reply_fallback, FormattedBody, MessageType, OriginalRoomMessageEvent,
Relation,
};
#[cfg(feature = "unstable-sanitize")]
use super::{sanitize::HtmlSanitizer, HtmlSanitizerMode, RemoveReplyFallback};
fn get_message_quote_fallbacks(original_message: &OriginalRoomMessageEvent) -> (String, String) {
let get_quotes = |body: &str, formatted: Option<&FormattedBody>, is_emote: bool| {
let OriginalRoomMessageEvent { room_id, event_id, sender, content, .. } = original_message;
let is_reply = matches!(content.relates_to, Some(Relation::Reply { .. }));
let emote_sign = is_emote.then_some("* ").unwrap_or_default();
let body = is_reply.then(|| remove_plain_reply_fallback(body)).unwrap_or(body);
#[cfg(feature = "unstable-sanitize")]
let html_body = FormattedOrPlainBody { formatted, body, is_reply };
#[cfg(not(feature = "unstable-sanitize"))]
let html_body = FormattedOrPlainBody { formatted, body };
(
format!("> {emote_sign}<{sender}> {body}").replace('\n', "\n> "),
format!(
"<mx-reply>\
<blockquote>\
<a href=\"https://matrix.to/#/{room_id}/{event_id}\">In reply to</a> \
{emote_sign}<a href=\"https://matrix.to/#/{sender}\">{sender}</a>\
<br>\
{html_body}\
</blockquote>\
</mx-reply>"
),
)
};
match &original_message.content.msgtype {
MessageType::Audio(_) => get_quotes("sent an audio file.", None, false),
MessageType::Emote(c) => get_quotes(&c.body, c.formatted.as_ref(), true),
MessageType::File(_) => get_quotes("sent a file.", None, false),
MessageType::Image(_) => get_quotes("sent an image.", None, false),
MessageType::Location(_) => get_quotes("sent a location.", None, false),
MessageType::Notice(c) => get_quotes(&c.body, c.formatted.as_ref(), false),
MessageType::ServerNotice(c) => get_quotes(&c.body, None, false),
MessageType::Text(c) => get_quotes(&c.body, c.formatted.as_ref(), false),
MessageType::Video(_) => get_quotes("sent a video.", None, false),
MessageType::VerificationRequest(content) => get_quotes(&content.body, None, false),
MessageType::_Custom(content) => get_quotes(&content.body, None, false),
}
}
struct EscapeHtmlEntities<'a>(&'a str);
impl fmt::Display for EscapeHtmlEntities<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
for c in self.0.chars() {
match c {
'&' => f.write_str("&")?,
'<' => f.write_str("<")?,
'>' => f.write_str(">")?,
'"' => f.write_str(""")?,
'\n' => f.write_str("<br>")?,
_ => f.write_char(c)?,
}
}
Ok(())
}
}
struct FormattedOrPlainBody<'a> {
formatted: Option<&'a FormattedBody>,
body: &'a str,
#[cfg(feature = "unstable-sanitize")]
is_reply: bool,
}
impl fmt::Display for FormattedOrPlainBody<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if let Some(formatted_body) = self.formatted {
#[cfg(feature = "unstable-sanitize")]
if self.is_reply {
let sanitizer =
HtmlSanitizer::new(HtmlSanitizerMode::Strict, RemoveReplyFallback::Yes);
write!(f, "{}", sanitizer.clean(&formatted_body.body))
} else {
f.write_str(&formatted_body.body)
}
#[cfg(not(feature = "unstable-sanitize"))]
f.write_str(&formatted_body.body)
} else {
write!(f, "{}", EscapeHtmlEntities(self.body))
}
}
}
pub fn plain_and_formatted_reply_body(
body: &str,
formatted: Option<impl fmt::Display>,
original_message: &OriginalRoomMessageEvent,
) -> (String, String) {
let (quoted, quoted_html) = get_message_quote_fallbacks(original_message);
let plain = format!("{quoted}\n{body}");
let html = match formatted {
Some(formatted) => format!("{quoted_html}{formatted}"),
None => format!("{quoted_html}{}", EscapeHtmlEntities(body)),
};
(plain, html)
}
#[cfg(test)]
mod tests {
use crate::{
event_id,
events::{room::message::RoomMessageEventContent, MessageLikeUnsigned},
room_id, user_id, MilliSecondsSinceUnixEpoch,
};
use super::OriginalRoomMessageEvent;
#[test]
fn fallback_multiline() {
let (plain_quote, html_quote) =
super::get_message_quote_fallbacks(&OriginalRoomMessageEvent {
content: RoomMessageEventContent::text_plain("multi\nline"),
event_id: event_id!("$1598361704261elfgc:localhost").to_owned(),
sender: user_id!("@alice:example.com").to_owned(),
origin_server_ts: MilliSecondsSinceUnixEpoch::now(),
room_id: room_id!("!n8f893n9:example.com").to_owned(),
unsigned: MessageLikeUnsigned::new(),
});
assert_eq!(plain_quote, "> <@alice:example.com> multi\n> line");
assert_eq!(
html_quote,
"<mx-reply>\
<blockquote>\
<a href=\"https://matrix.to/#/!n8f893n9:example.com/$1598361704261elfgc:localhost\">In reply to</a> \
<a href=\"https://matrix.to/#/@alice:example.com\">@alice:example.com</a>\
<br>\
multi<br>line\
</blockquote>\
</mx-reply>",
);
}
}