feat(ReverseProxy): add SSL/TLS configuration options and build TLS config method

internal/route/reverse_proxy.go

@@ -1,7 +1,6 @@
 package route
 
 import (
-	"crypto/tls"
 	"net/http"
 	"sync"
 
@@ -44,10 +43,12 @@ func NewReverseProxyRoute(base *Route) (*ReveseProxyRoute, gperr.Error) {
 		trans = a.Transport()
 		proxyURL = nettypes.NewURL(agent.HTTPProxyURL)
 	} else {
-		trans = gphttp.NewTransport()
-		if httpConfig.NoTLSVerify {
-			trans.TLSClientConfig = &tls.Config{InsecureSkipVerify: true} //nolint:gosec
+		tlsConfig, err := httpConfig.BuildTLSConfig(base.ProxyURL)
+		if err != nil {
+			return nil, err
 		}
+
+		trans = gphttp.NewTransportWithTLSConfig(tlsConfig)
 		if httpConfig.ResponseHeaderTimeout > 0 {
 			trans.ResponseHeaderTimeout = httpConfig.ResponseHeaderTimeout
 		}

internal/route/types/http_config.go

@@ -1,11 +1,118 @@
 package route
 
 import (
+	"crypto/tls"
+	"crypto/x509"
+	"os"
+	"strings"
 	"time"
+
+	"github.com/yusing/go-proxy/internal/gperr"
+	nettypes "github.com/yusing/go-proxy/internal/net/types"
 )
 
 type HTTPConfig struct {
 	NoTLSVerify           bool          `json:"no_tls_verify,omitempty"`
 	ResponseHeaderTimeout time.Duration `json:"response_header_timeout,omitempty" swaggertype:"primitive,integer"`
 	DisableCompression    bool          `json:"disable_compression,omitempty"`
+
+	// SSL/TLS proxy options (nginx-like)
+	SSLServerName         *string  `json:"ssl_server_name,omitempty"`         // SNI server name
+	SSLTrustedCertificate string   `json:"ssl_trusted_certificate,omitempty"` // Path to trusted CA certificates
+	SSLCertificate        string   `json:"ssl_certificate,omitempty"`         // Path to client certificate
+	SSLCertificateKey     string   `json:"ssl_certificate_key,omitempty"`     // Path to client certificate key
+	SSLProtocols          []string `json:"ssl_protocols,omitempty"`           // Allowed TLS protocols
+}
+
+// BuildTLSConfig creates a TLS configuration based on the HTTP config options.
+func (cfg *HTTPConfig) BuildTLSConfig(targetURL *nettypes.URL) (*tls.Config, gperr.Error) {
+	tlsConfig := &tls.Config{}
+
+	// Handle InsecureSkipVerify (legacy NoTLSVerify option)
+	if cfg.NoTLSVerify {
+		tlsConfig.InsecureSkipVerify = true
+	}
+
+	// Handle ssl_server_name (SNI)
+	if cfg.SSLServerName != nil {
+		switch *cfg.SSLServerName {
+		case "off":
+			// Disable SNI by setting empty string
+			tlsConfig.ServerName = ""
+		case "on", "":
+			// Use hostname from target URL for SNI
+			tlsConfig.ServerName = targetURL.Hostname()
+		default:
+			tlsConfig.ServerName = *cfg.SSLServerName
+		}
+	} else {
+		// Default behavior - use hostname for SNI
+		tlsConfig.ServerName = targetURL.Hostname()
+	}
+
+	// Handle ssl_trusted_certificate
+	if cfg.SSLTrustedCertificate != "" {
+		caCertData, err := os.ReadFile(cfg.SSLTrustedCertificate)
+		if err != nil {
+			return nil, gperr.New("failed to read trusted certificate file").
+				Subject(cfg.SSLTrustedCertificate).
+				With(err)
+		}
+
+		caCertPool := x509.NewCertPool()
+		if !caCertPool.AppendCertsFromPEM(caCertData) {
+			return nil, gperr.New("failed to parse trusted certificates").
+				Subject(cfg.SSLTrustedCertificate)
+		}
+		tlsConfig.RootCAs = caCertPool
+	}
+
+	// Handle ssl_certificate and ssl_certificate_key (client certificates)
+	if cfg.SSLCertificate != "" {
+		if cfg.SSLCertificateKey == "" {
+			return nil, gperr.New("ssl_certificate_key is required when ssl_certificate is specified")
+		}
+
+		clientCert, err := tls.LoadX509KeyPair(cfg.SSLCertificate, cfg.SSLCertificateKey)
+		if err != nil {
+			return nil, gperr.New("failed to load client certificate").
+				Subject(cfg.SSLCertificate).
+				With(err)
+		}
+		tlsConfig.Certificates = []tls.Certificate{clientCert}
+	}
+
+	// Handle ssl_protocols (TLS versions)
+	if len(cfg.SSLProtocols) > 0 {
+		var minVersion, maxVersion uint16
+
+		for _, protocol := range cfg.SSLProtocols {
+			var version uint16
+			switch strings.ToLower(protocol) {
+			case "tlsv1.0":
+				version = tls.VersionTLS10
+			case "tlsv1.1":
+				version = tls.VersionTLS11
+			case "tlsv1.2":
+				version = tls.VersionTLS12
+			case "tlsv1.3":
+				version = tls.VersionTLS13
+			default:
+				return nil, gperr.New("unsupported TLS protocol").
+					Subject(protocol)
+			}
+
+			if minVersion == 0 || version < minVersion {
+				minVersion = version
+			}
+			if maxVersion == 0 || version > maxVersion {
+				maxVersion = version
+			}
+		}
+
+		tlsConfig.MinVersion = minVersion
+		tlsConfig.MaxVersion = maxVersion
+	}
+
+	return tlsConfig, nil
 }