feat(proxy): add SOCKS5 support and improve proxy handling

- Added SOCKS5 proxy support, including authentication.
- Improved handling of proxy schemes and associated error logging.
- Enhanced transport creation for HTTP, HTTPS, and SOCKS5 proxies with better configuration management.

sdk/cliproxy/rtprovider.go

@@ -1,12 +1,16 @@
 package cliproxy
 
 import (
+	"context"
+	"net"
 	"net/http"
 	"net/url"
 	"strings"
 	"sync"
 
 	coreauth "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/auth"
+	log "github.com/sirupsen/logrus"
+	"golang.org/x/net/proxy"
 )
 
 // defaultRoundTripperProvider returns a per-auth HTTP RoundTripper based on
@@ -25,27 +29,49 @@ func (p *defaultRoundTripperProvider) RoundTripperFor(auth *coreauth.Auth) http.
 	if auth == nil {
 		return nil
 	}
-	proxy := strings.TrimSpace(auth.ProxyURL)
-	if proxy == "" {
+	proxyStr := strings.TrimSpace(auth.ProxyURL)
+	if proxyStr == "" {
 		return nil
 	}
 	p.mu.RLock()
-	rt := p.cache[proxy]
+	rt := p.cache[proxyStr]
 	p.mu.RUnlock()
 	if rt != nil {
 		return rt
 	}
-	// Build HTTP/HTTPS proxy transport; ignore SOCKS for simplicity here.
-	u, err := url.Parse(proxy)
-	if err != nil {
+	// Parse the proxy URL to determine the scheme.
+	proxyURL, errParse := url.Parse(proxyStr)
+	if errParse != nil {
+		log.Errorf("parse proxy URL failed: %v", errParse)
 		return nil
 	}
-	if u.Scheme != "http" && u.Scheme != "https" {
+	var transport *http.Transport
+	// Handle different proxy schemes.
+	if proxyURL.Scheme == "socks5" {
+		// Configure SOCKS5 proxy with optional authentication.
+		username := proxyURL.User.Username()
+		password, _ := proxyURL.User.Password()
+		proxyAuth := &proxy.Auth{User: username, Password: password}
+		dialer, errSOCKS5 := proxy.SOCKS5("tcp", proxyURL.Host, proxyAuth, proxy.Direct)
+		if errSOCKS5 != nil {
+			log.Errorf("create SOCKS5 dialer failed: %v", errSOCKS5)
+			return nil
+		}
+		// Set up a custom transport using the SOCKS5 dialer.
+		transport = &http.Transport{
+			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+				return dialer.Dial(network, addr)
+			},
+		}
+	} else if proxyURL.Scheme == "http" || proxyURL.Scheme == "https" {
+		// Configure HTTP or HTTPS proxy.
+		transport = &http.Transport{Proxy: http.ProxyURL(proxyURL)}
+	} else {
+		log.Errorf("unsupported proxy scheme: %s", proxyURL.Scheme)
 		return nil
 	}
-	transport := &http.Transport{Proxy: http.ProxyURL(u)}
 	p.mu.Lock()
-	p.cache[proxy] = transport
+	p.cache[proxyStr] = transport
 	p.mu.Unlock()
 	return transport
 }