Implement basic chat functionality

src/DedicatedServer.cpp

@@ -149,6 +149,8 @@ namespace Feather
         //    .uuid = { 4658857991808325907ull, 7518717155607718277ull },
         //    .username = start.username
         //};
+        client.SetUsername(start.username);
+
         std::string uuid = "ecb99913-96a8-40a7-8529-a2ca6ad95768";
         Login::ClientboundSuccess success =
         {
@@ -203,4 +205,22 @@ namespace Feather
     {
         // TODO: check these and kick clients that don't send em right or at all
     }
+
+    template <>
+    void DedicatedServer::HandlePacket(MinecraftClient& client, const Play::ServerboundChatMessage& chat)
+    {
+        Log::Info("{}: {}", client.GetUsername(), chat.message);
+
+        std::string json = fmt::format(R"({{ "text": "<{}> {}" }})", client.GetUsername(), chat.message);
+        Play::ClientboundChatMessage message =
+        {
+            .jsonData = json,
+            .position = 0
+        };
+
+        // m_clients is already locked for us!
+        auto& clients = m_clients.steal();
+        for (auto& client : clients)
+            client.SendMessage(message);
+    }
 }

src/MinecraftClient.h

@@ -16,9 +16,14 @@ namespace Feather
         inline Network::TCPClientHandle& GetTCPClient() { return m_client; }
         inline Protocol::ProtocolContext& GetContext() { return m_context; }
 
+        inline const std::string& GetUsername() const        { return m_username; }
+        inline void SetUsername(const std::string& username) { m_username = username; }
+
         void SendMessage(const NetworkMessage& message);
 
     private:
+        std::string               m_username;
+
         Network::TCPClientHandle  m_client;
         Protocol::ProtocolContext m_context;
     };

src/protocol/protocol.hjson

@@ -139,17 +139,37 @@
         {
             serverbound:
             {
+                ChatMessage:
+                {
+                    id   : 0x03
+                    vars :
+                    {
+                        message : string[256]
+                    }
+                }
+
                 KeepAlive:
                 {
-                    id: 0x0F
-                    vars: {
-                        id: int64
+                    id   : 0x0F
+                    vars : 
+                    {
+                        id : int64
                     }
                 }
             }
 
             clientbound :
             {
+                ChatMessage:
+                {
+                    id   : 0x0F
+                    vars :
+                    {
+                        jsonData : string[32767]
+                        position : uint8
+                    }
+                }
+
                 JoinGame :
                 {
                     id    : 38