Limit nickname length to 50 unicode codepoints

frontend/index.html

@@ -26,6 +26,7 @@
           type="text"
           id="join-session-nickname"
           placeholder="Nickname"
+          maxlength="50"
           required
         />
         

src/main.rs

@@ -8,6 +8,7 @@ use warp as warb; // i think it's funny
 mod events;
 mod viewer_connection;
 mod watch_session;
+mod utils;
 
 use serde::Deserialize;
 

src/utils.rs

@@ -0,0 +1,6 @@
+pub fn truncate_str(s: &str, max_chars: usize) -> &str {
+    match s.char_indices().nth(max_chars) {
+        None => s,
+        Some((idx, _)) => &s[..idx],
+    }
+}

src/viewer_connection.rs

@@ -16,6 +16,7 @@ use warp::ws::{Message, WebSocket};
 
 use crate::{
     events::{WatchEvent, WatchEventData},
+    utils::truncate_str,
     watch_session::{get_session, handle_watch_event_data},
 };
 
@@ -53,6 +54,7 @@ pub async fn ws_subscribe(session_uuid: Uuid, nickname: String, colour: String,
     if !colour.len() == 6 || !colour.chars().all(|x| x.is_ascii_hexdigit()) {
         colour = String::from("7ed0ff");
     }
+    let nickname = truncate_str(&nickname, 50).to_string();
 
     CONNECTED_VIEWERS.write().await.insert(
         viewer_id,