[client,signal,management] Add browser client support (#4415)

shared/relay/client/client.go

@@ -9,11 +9,8 @@ import (
 
 	log "github.com/sirupsen/logrus"
 
-	"github.com/netbirdio/netbird/client/iface"
 	auth "github.com/netbirdio/netbird/shared/relay/auth/hmac"
 	"github.com/netbirdio/netbird/shared/relay/client/dialer"
-	"github.com/netbirdio/netbird/shared/relay/client/dialer/quic"
-	"github.com/netbirdio/netbird/shared/relay/client/dialer/ws"
 	"github.com/netbirdio/netbird/shared/relay/healthcheck"
 	"github.com/netbirdio/netbird/shared/relay/messages"
 )
@@ -296,14 +293,7 @@ func (c *Client) Close() error {
 }
 
 func (c *Client) connect(ctx context.Context) (*RelayAddr, error) {
-	// Force WebSocket for MTUs larger than default to avoid QUIC DATAGRAM frame size issues
-	var dialers []dialer.DialeFn
-	if c.mtu > 0 && c.mtu > iface.DefaultMTU {
-		c.log.Infof("MTU %d exceeds default (%d), forcing WebSocket transport to avoid DATAGRAM frame size issues", c.mtu, iface.DefaultMTU)
-		dialers = []dialer.DialeFn{ws.Dialer{}}
-	} else {
-		dialers = []dialer.DialeFn{quic.Dialer{}, ws.Dialer{}}
-	}
+	dialers := c.getDialers()
 
 	rd := dialer.NewRaceDial(c.log, dialer.DefaultConnectionTimeout, c.connectionURL, dialers...)
 	conn, err := rd.Dial()

shared/relay/client/dialer/ws/conn.go

@@ -38,8 +38,7 @@ func (c *Conn) Read(b []byte) (n int, err error) {
 }
 
 func (c *Conn) Write(b []byte) (n int, err error) {
-	err = c.Conn.Write(c.ctx, websocket.MessageBinary, b)
-	return 0, err
+	return 0, c.Conn.Write(c.ctx, websocket.MessageBinary, b)
 }
 
 func (c *Conn) RemoteAddr() net.Addr {

shared/relay/client/dialer/ws/dialopts_generic.go

@@ -0,0 +1,11 @@
+//go:build !js
+
+package ws
+
+import "github.com/coder/websocket"
+
+func createDialOptions() *websocket.DialOptions {
+	return &websocket.DialOptions{
+		HTTPClient: httpClientNbDialer(),
+	}
+}

shared/relay/client/dialer/ws/dialopts_js.go

@@ -0,0 +1,10 @@
+//go:build js
+
+package ws
+
+import "github.com/coder/websocket"
+
+func createDialOptions() *websocket.DialOptions {
+	// WASM version doesn't support HTTPClient
+	return &websocket.DialOptions{}
+}

shared/relay/client/dialer/ws/ws.go

@@ -32,9 +32,7 @@ func (d Dialer) Dial(ctx context.Context, address string) (net.Conn, error) {
 		return nil, err
 	}
 
-	opts := &websocket.DialOptions{
-		HTTPClient: httpClientNbDialer(),
-	}
+	opts := createDialOptions()
 
 	parsedURL, err := url.Parse(wsURL)
 	if err != nil {

shared/relay/client/dialers_generic.go

@@ -0,0 +1,19 @@
+//go:build !js
+
+package client
+
+import (
+	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/shared/relay/client/dialer"
+	"github.com/netbirdio/netbird/shared/relay/client/dialer/quic"
+	"github.com/netbirdio/netbird/shared/relay/client/dialer/ws"
+)
+
+// getDialers returns the list of dialers to use for connecting to the relay server.
+func (c *Client) getDialers() []dialer.DialeFn {
+	if c.mtu > 0 && c.mtu > iface.DefaultMTU {
+		c.log.Infof("MTU %d exceeds default (%d), forcing WebSocket transport to avoid DATAGRAM frame size issues", c.mtu, iface.DefaultMTU)
+		return []dialer.DialeFn{ws.Dialer{}}
+	}
+	return []dialer.DialeFn{quic.Dialer{}, ws.Dialer{}}
+}

shared/relay/client/dialers_js.go

@@ -0,0 +1,13 @@
+//go:build js
+
+package client
+
+import (
+	"github.com/netbirdio/netbird/shared/relay/client/dialer"
+	"github.com/netbirdio/netbird/shared/relay/client/dialer/ws"
+)
+
+func (c *Client) getDialers() []dialer.DialeFn {
+	// JS/WASM build only uses WebSocket transport
+	return []dialer.DialeFn{ws.Dialer{}}
+}