Implement client user agent getter

Add a getter for the user agent of a client.
Remove the ostype subpackage, this library won't be responsible
for parsing the user agent string due to excessive complexity.
It is up to the user to parse the UA to get detailed information
about the client.

Author: romshark

client.go

@@ -18,9 +18,15 @@ type Client struct {
 	conn *websocket.Conn
 
 	connectionTime time.Time
+	userAgent      string
 	Session        *Session
 }
 
+// UserAgent returns the user agent string associated with this client
+func (clt *Client) UserAgent() string {
+	return clt.userAgent
+}
+
 // write sends the given data to the other side of the socket,
 // it also protects the connection from concurrent writes
 func (clt *Client) write(data []byte) error {

examples/chatroom/server/sessions.go

@@ -11,7 +11,7 @@ var sessions = make(map[string]*webwire.Client)
 
 func onClientConnected(newClient *webwire.Client) {
 	connectedClients[newClient] = true
-	log.Printf("New client connected: %s", newClient.RemoteAddr())
+	log.Printf("New client connected: %s | %s", newClient.RemoteAddr(), newClient.UserAgent())
 }
 
 func onClientDisconnected(client *webwire.Client) {

ostype/ostype.go

@@ -354,6 +354,7 @@ func (srv *Server) ServeHTTP(
 		&sync.Mutex{},
 		conn,
 		time.Now(),
+		req.Header.Get("User-Agent"),
 		nil,
 	}