Add max chat message length

Fixes #115
Credit to @scorpion9979 for the previous implementation (https://gitlab.com/veloren/veloren/merge_requests/215)

client/src/lib.rs

@@ -9,7 +9,10 @@ pub use specs::{join::Join, saveload::Marker, Entity as EcsEntity, ReadStorage};
 
 use common::{
     comp,
-    msg::{ClientMsg, ClientState, RequestStateError, ServerError, ServerInfo, ServerMsg},
+    msg::{
+        validate_chat_msg, ChatMsgValidationError, ClientMsg, ClientState, RequestStateError,
+        ServerError, ServerInfo, ServerMsg, MAX_BYTES_CHAT_MSG,
+    },
     net::PostBox,
     state::{State, Uid},
     terrain::{block::Block, TerrainChunk, TerrainChunkSize},
@@ -232,7 +235,13 @@ impl Client {
     /// Send a chat message to the server.
     #[allow(dead_code)]
     pub fn send_chat(&mut self, msg: String) {
-        self.postbox.send_message(ClientMsg::chat(msg))
+        match validate_chat_msg(&msg) {
+            Ok(()) => self.postbox.send_message(ClientMsg::chat(msg)),
+            Err(ChatMsgValidationError::TooLong) => log::warn!(
+                "Attempted to send a message that's too long (Over {} bytes)",
+                MAX_BYTES_CHAT_MSG
+            ),
+        }
     }
 
     /// Remove all cached terrain

common/src/msg/mod.rs

@@ -16,3 +16,18 @@ pub enum ClientState {
     Dead,
     Character,
 }
+
+pub const MAX_BYTES_CHAT_MSG: usize = 80;
+
+pub enum ChatMsgValidationError {
+    TooLong,
+}
+
+pub fn validate_chat_msg(msg: &str) -> Result<(), ChatMsgValidationError> {
+    // TODO: Consider using grapheme cluster count instead of size in bytes
+    if msg.len() <= MAX_BYTES_CHAT_MSG {
+        Ok(())
+    } else {
+        Err(ChatMsgValidationError::TooLong)
+    }
+}

server/src/lib.rs

@@ -999,8 +999,17 @@ impl Server {
                             ClientState::Registered
                             | ClientState::Spectator
                             | ClientState::Dead
-                            | ClientState::Character => new_chat_msgs
+                            | ClientState::Character => match validate_chat_msg(&message) {
-                                .push((Some(entity), ServerMsg::ChatMsg { chat_type, message })),
+                                Ok(()) => new_chat_msgs.push((
+                                    Some(entity),
+                                    ServerMsg::ChatMsg { chat_type, message },
+                                )),
+                                Err(ChatMsgValidationError::TooLong) => log::warn!(
+                                    "Recieved a chat message that's too long (max:{} len:{})",
+                                    MAX_BYTES_CHAT_MSG,
+                                    message.len()
+                                ),
+                            },
                             ClientState::Pending => {}
                         },
                         ClientMsg::PlayerPhysics { pos, vel, ori } => match client.client_state {

voxygen/src/hud/chat.rs

@@ -3,7 +3,7 @@ use super::{
     KILL_COLOR, META_COLOR, PRIVATE_COLOR, SAY_COLOR, TELL_COLOR, TEXT_COLOR,
 };
 use client::Event as ClientEvent;
-use common::ChatType;
+use common::{msg::validate_chat_msg, ChatType};
 use conrod_core::{
     input::Key,
     position::Dimension,
@@ -59,7 +59,9 @@ impl<'a> Chat<'a> {
     }
 
     pub fn input(mut self, input: String) -> Self {
-        self.force_input = Some(input);
+        if let Ok(()) = validate_chat_msg(&input) {
+            self.force_input = Some(input);
+        }
         self
     }
 
@@ -206,7 +208,9 @@ impl<'a> Widget for Chat<'a> {
             {
                 let mut input = str.to_owned();
                 input.retain(|c| c != '\n');
-                state.update(|s| s.input = input);
+                if let Ok(()) = validate_chat_msg(&input) {
+                    state.update(|s| s.input = input);
+                }
             }
         }