fix: apply managed Nginx public entry without service restart

backend/internal/nginxgateway/gateway.go

@@ -4,6 +4,8 @@ package nginxgateway
 
 import (
 	"context"
+	"crypto/tls"
+	"crypto/x509"
 	"errors"
 	"fmt"
 	"net"
@@ -72,7 +74,21 @@ func RefreshAuth(domain string, routes gin.RoutesInfo, authPort int) error {
 }
 
 func RefreshAuthEntry(opts nginxconfig.RenderOptions, routes gin.RoutesInfo, authPort int) error {
-	if Running() {
+	return refreshEntry(opts, routes, authPort, false, "", nil)
+}
+
+// UpdateEntry applies a validated public entry to an existing managed site.
+// persist is called after a successful reload; failure restores the old site.
+func UpdateEntry(opts nginxconfig.RenderOptions, expectedDomain string, routes gin.RoutesInfo, authPort int, persist func() error) error {
+	if !Begin() {
+		return errors.New("公网入口操作正在进行")
+	}
+	defer End()
+	return refreshEntry(opts, routes, authPort, true, expectedDomain, persist)
+}
+
+func refreshEntry(opts nginxconfig.RenderOptions, routes gin.RoutesInfo, authPort int, allowChange bool, expectedDomain string, persist func() error) error {
+	if Running() && !allowChange {
 		return errors.New("公网入口操作正在进行")
 	}
 	scheme := strings.ToLower(strings.TrimSpace(opts.Scheme))
@@ -88,7 +104,7 @@ func RefreshAuthEntry(opts nginxconfig.RenderOptions, routes gin.RoutesInfo, aut
 		return err
 	}
 	stage := Stage()
-	if scheme == "https" && stage != "https" {
+	if scheme == "https" && stage != "https" && !allowChange {
 		return errors.New("请先启用 HTTPS 站点")
 	}
 	if scheme == "http" && stage == "none" {
@@ -98,32 +114,80 @@ func RefreshAuthEntry(opts nginxconfig.RenderOptions, routes gin.RoutesInfo, aut
 	if err != nil {
 		return err
 	}
+	if allowChange && !strings.Contains(string(previous), "# Install this HTTP site first.") && !strings.Contains(string(previous), "# Plain HTTP public entry") {
+		return errors.New("现有站点不是 opsx-vpn 托管配置，拒绝覆盖")
+	}
+	if allowChange && (expectedDomain == "" || !strings.Contains(string(previous), "server_name "+expectedDomain+";")) {
+		return errors.New("现有站点域名与运行配置不匹配，拒绝覆盖")
+	}
 	domain := strings.ToLower(strings.TrimSpace(opts.Domain))
-	if !strings.Contains(string(previous), "server_name "+domain+";") {
+	if !allowChange && !strings.Contains(string(previous), "server_name "+domain+";") {
 		return errors.New("现有站点域名与配置不匹配")
 	}
+	if allowChange && scheme == "https" {
+		fullchain, privkey, _ := tlsservice.CertificateFiles(domain)
+		pair, err := tls.LoadX509KeyPair(fullchain, privkey)
+		if err != nil || len(pair.Certificate) == 0 {
+			return errors.New("目标域名没有可用的 HTTPS 证书，请先准备证书")
+		}
+		leaf, err := x509.ParseCertificate(pair.Certificate[0])
+		if err != nil || leaf.VerifyHostname(domain) != nil || time.Now().Before(leaf.NotBefore) || !time.Now().Before(leaf.NotAfter) {
+			return errors.New("目标域名证书无效或已过期")
+		}
+	}
+	if allowChange {
+		listenPort := tlsservice.EffectivePort(scheme, opts.Port)
+		portAlreadyManaged := strings.Contains(string(previous), fmt.Sprintf("listen %d;", listenPort)) ||
+			strings.Contains(string(previous), fmt.Sprintf("listen %d ssl", listenPort))
+		if !portAlreadyManaged {
+			listener, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", listenPort))
+			if err != nil {
+				return fmt.Errorf("目标端口 %d 已占用: %w", listenPort, err)
+			}
+			listener.Close()
+		}
+	}
 	httpSite, httpsSite, err := nginxconfig.RenderWithOptions(opts, routes, authPort)
 	if err != nil {
 		return err
 	}
 	if string(previous) == httpSite+httpsSite {
+		if persist != nil {
+			return persist()
+		}
 		return nil
 	}
-	if err := writeSite(httpSite + httpsSite); err != nil {
+	validate := func() error { return command(func(string) {}, 15*time.Second, "nginx", "-t") }
+	reload := func() error { return command(func(string) {}, 15*time.Second, "systemctl", "reload", "nginx") }
+	return swapManagedSite(string(previous), httpSite+httpsSite, persist, writeSite, validate, reload)
+}
+
+func swapManagedSite(previous, next string, persist func() error, write func(string) error, validate, reload func() error) error {
+	if err := write(next); err != nil {
 		return err
 	}
-	rollback := func() {
-		_ = writeSite(string(previous))
-		_ = command(func(string) {}, 15*time.Second, "nginx", "-t")
-		_ = command(func(string) {}, 15*time.Second, "systemctl", "reload", "nginx")
+	rollback := func(cause error) error {
+		if err := write(previous); err != nil {
+			return fmt.Errorf("%w；恢复旧站点失败: %v", cause, err)
+		}
+		if err := validate(); err != nil {
+			return fmt.Errorf("%w；旧站点配置校验失败: %v", cause, err)
+		}
+		if err := reload(); err != nil {
+			return fmt.Errorf("%w；恢复旧站点重载失败: %v", cause, err)
+		}
+		return cause
 	}
-	if err := command(func(string) {}, 15*time.Second, "nginx", "-t"); err != nil {
-		rollback()
-		return err
+	if err := validate(); err != nil {
+		return rollback(err)
 	}
-	if err := command(func(string) {}, 15*time.Second, "systemctl", "reload", "nginx"); err != nil {
-		rollback()
-		return err
+	if err := reload(); err != nil {
+		return rollback(err)
+	}
+	if persist != nil {
+		if err := persist(); err != nil {
+			return rollback(err)
+		}
 	}
 	return nil
 }
@@ -246,6 +310,12 @@ func Run(domain string, routes gin.RoutesInfo, emit func(string)) error {
 
 // RunEntry activates the public entry for the given scheme/port. HTTP skips ACME.
 func RunEntry(opts nginxconfig.RenderOptions, routes gin.RoutesInfo, emit func(string)) error {
+	return RunEntryWithAuth(opts, routes, 0, emit)
+}
+
+// RunEntryWithAuth preserves a running OpenVPN browser-auth upstream when
+// regenerating an already managed site.
+func RunEntryWithAuth(opts nginxconfig.RenderOptions, routes gin.RoutesInfo, authPort int, emit func(string)) error {
 	domain := strings.ToLower(strings.TrimSpace(opts.Domain))
 	scheme := strings.ToLower(strings.TrimSpace(opts.Scheme))
 	if scheme == "" {
@@ -265,7 +335,7 @@ func RunEntry(opts nginxconfig.RenderOptions, routes gin.RoutesInfo, emit func(s
 	} else if err := checkSites(); err != nil {
 		return err
 	}
-	httpSite, httpsSite, err := nginxconfig.RenderWithOptions(opts, routes, 0)
+	httpSite, httpsSite, err := nginxconfig.RenderWithOptions(opts, routes, authPort)
 	if err != nil {
 		return err
 	}