Ignore ancient messages

src/bot.rs

@@ -25,7 +25,7 @@ use matrix_sdk::{
                 },
             },
         },
-        OwnedRoomOrAliasId, RoomAliasId, RoomId, RoomOrAliasId,
+        OwnedRoomOrAliasId, RoomAliasId, RoomId, RoomOrAliasId, SecondsSinceUnixEpoch,
     },
     Client, RoomState,
 };
@@ -33,7 +33,7 @@ use never_say_never::Never;
 use reqwest::Url;
 use serde::Deserialize;
 use time::{
-    convert::{Day, Hour, Minute},
+    convert::{Day, Hour, Minute, Second},
     ext::NumericalDuration,
     macros::format_description,
     OffsetDateTime, UtcOffset,
@@ -337,6 +337,17 @@ impl Bot {
         room: &Room,
     ) -> Result<()> {
         event!(Level::TRACE, ?ev, "handling message");
+        if SecondsSinceUnixEpoch::now().get() - ev.origin_server_ts.as_secs()
+            > Second::per(Day).into()
+        {
+            event!(
+                Level::INFO,
+                origin_server_ts = i64::from(ev.origin_server_ts.get()),
+                "message is too old, ignoring"
+            );
+            return Ok(());
+        }
+
         if Some(&*ev.sender) == self.client.user_id() {
             event!(Level::TRACE, "message from ourselves, ignoring");
             return Ok(());