Do not process commands coming from ourselves (help text)

dicebot/src/bot/event_handlers.rs

@@ -5,11 +5,11 @@ use crate::error::BotError;
 use log::{debug, error, info, warn};
 use matrix_sdk::ruma::events::room::member::RoomMemberEventContent;
 use matrix_sdk::ruma::events::{StrippedStateEvent, SyncMessageLikeEvent};
-use matrix_sdk::{Client, DisplayName};
 use matrix_sdk::{self, room::Room, ruma::events::room::message::RoomMessageEventContent};
+use matrix_sdk::{Client, DisplayName};
 use std::ops::Sub;
-use std::time::{Duration, SystemTime};
 use std::time::UNIX_EPOCH;
+use std::time::{Duration, SystemTime};
 
 /// Check if a message is recent enough to actually process. If the
 /// message is within "oldest_message_age" seconds, this function
@@ -67,7 +67,23 @@ async fn should_process_message<'a>(
         .map(str::to_string)
         .unwrap_or_else(|| String::new());
 
-    let sender_username: String = format!("@{}:{}", event.sender().localpart(), event.sender().server_name());
+    let sender_username: String = format!(
+        "@{}:{}",
+        event.sender().localpart(),
+        event.sender().server_name()
+    );
+
+    // Do not process messages from the bot itself. Otherwise it might
+    // try to execute its own commands.
+    let bot_username = bot
+        .client
+        .user_id()
+        .map(|u| format!("@{}:{}", u.localpart(), u.server_name()))
+        .unwrap_or_default();
+
+    if sender_username == bot_username {
+        return Err(BotError::ShouldNotProcessError);
+    }
 
     Ok((msg_body, sender_username))
 }
@@ -100,7 +116,10 @@ pub(super) async fn on_stripped_state_member(
 
     info!(
         "Autojoining room {}",
-        room.display_name().await.ok().unwrap_or_else(|| DisplayName::Named("[error]".to_string()))
+        room.display_name()
+            .await
+            .ok()
+            .unwrap_or_else(|| DisplayName::Named("[error]".to_string()))
     );
 
     if let Err(e) = client.join_room_by_id(&room.room_id()).await {
@@ -134,6 +153,11 @@ pub(super) async fn on_room_message(
         .execute_commands(&room, &sender_username, &msg_body)
         .await;
 
-    bot.handle_results(&room, &sender_username, event.event_id().to_owned(), results)
+    bot.handle_results(
+        &room,
+        &sender_username,
+        event.event_id().to_owned(),
+        results,
+    )
     .await;
 }