feat: configurable parser and refactor config

common/utils/netutil/proxy.go

@@ -1,6 +1,10 @@
 package netutil
 
 import (
+	"context"
+	"fmt"
+	"net"
+	"net/http"
 	"net/url"
 
 	"golang.org/x/net/proxy"
@@ -13,3 +17,38 @@ func NewProxyDialer(proxyUrl string) (proxy.Dialer, error) {
 	}
 	return proxy.FromURL(url, proxy.Direct)
 }
+
+func NewProxyHTTPClient(proxyUrl string) (*http.Client, error) {
+	if proxyUrl == "" {
+		return http.DefaultClient, nil
+	}
+
+	u, err := url.Parse(proxyUrl)
+	if err != nil {
+		return nil, err
+	}
+
+	switch u.Scheme {
+	case "http", "https":
+		return &http.Client{
+			Transport: &http.Transport{
+				Proxy: http.ProxyURL(u),
+			},
+		}, nil
+	case "socks5":
+		dialer, err := proxy.SOCKS5("tcp", u.Host, nil, proxy.Direct)
+		if err != nil {
+			return nil, err
+		}
+
+		return &http.Client{
+			Transport: &http.Transport{
+				DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+					return dialer.Dial(network, addr)
+				},
+			},
+		}, nil
+	default:
+		return nil, fmt.Errorf("unsupported proxy scheme: %s", u.Scheme)
+	}
+}