Add v2 network package

network/v2/proxy_network.go

@@ -0,0 +1,36 @@
+package network
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+
+	"github.com/9seconds/mtg/v2/essentials"
+	"golang.org/x/net/proxy"
+)
+
+type proxyNetwork struct {
+	Network
+	client proxy.ContextDialer
+}
+
+func (p proxyNetwork) DialContext(ctx context.Context, network, address string) (essentials.Conn, error) {
+	conn, err := p.client.DialContext(ctx, network, address)
+	if err != nil {
+		return nil, err
+	}
+
+	return essentials.WrapNetConn(conn), nil
+}
+
+func NewProxyNetwork(base Network, proxyURL *url.URL) (*proxyNetwork, error) {
+	socks, err := proxy.FromURL(proxyURL, base.NativeDialer())
+	if err != nil {
+		return nil, fmt.Errorf("cannot build proxy dialer: %w", err)
+	}
+
+	return &proxyNetwork{
+		Network: base,
+		client:  socks.(proxy.ContextDialer),
+	}, nil
+}