refactor(jafar): remove unnecessary dep on netx (#497)

internal/cmd/jafar/tlsproxy/tlsproxy.go

@@ -12,9 +12,13 @@ import (
 	"sync"
 
 	"github.com/apex/log"
-	"github.com/ooni/probe-cli/v3/internal/engine/netx"
 )
 
+// Dialer establishes network connections
+type Dialer interface {
+	DialContext(ctx context.Context, network, address string) (net.Conn, error)
+}
+
 // CensoringProxy is a censoring TLS proxy
 type CensoringProxy struct {
 	keywords []string
@@ -27,7 +31,7 @@ type CensoringProxy struct {
 // the SNII record of a ClientHello. dnsNetwork and dnsAddress are
 // settings to configure the upstream, non censored DNS.
 func NewCensoringProxy(
-	keywords []string, uncensored netx.Dialer,
+	keywords []string, uncensored Dialer,
 ) *CensoringProxy {
 	return &CensoringProxy{
 		keywords: keywords,

internal/cmd/jafar/tlsproxy/tlsproxy_test.go

@@ -174,8 +174,6 @@ func TestForwardWriteError(t *testing.T) {
 
 type mockedConnReadOkay struct {
 	net.Conn
-	localIP  net.IP
-	remoteIP net.IP
 }
 
 func (c *mockedConnReadOkay) Read(b []byte) (int, error) {