Add opt-in built-in Feishu OIDC issuer for OpenVPN

backend/internal/api/identity_gateway.go

@@ -0,0 +1,62 @@
+package api
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"vpn-platform/backend/internal/model"
+	"vpn-platform/backend/internal/nginxgateway"
+	"vpn-platform/backend/internal/service"
+	"vpn-platform/backend/internal/store"
+	"vpn-platform/backend/internal/tlsservice"
+)
+
+// Only a single OpenVPN WebAuth instance may own /oauth2/ on the management
+// hostname. Never route an arbitrary user-supplied address to a local port.
+func authGatewayPort(domain string) (int, error) {
+	var tunnels []model.Tunnel
+	if err := store.DB.Where("protocol = ? AND state = ?", "openvpn", "running").Find(&tunnels).Error; err != nil {
+		return 0, err
+	}
+	port := 0
+	for _, tunnel := range tunnels {
+		cfg, err := store.TunnelConfig(&tunnel)
+		if err != nil {
+			return 0, err
+		}
+		if service.Str(cfg, "auth_mode") != "oidc" || !strings.EqualFold(strings.TrimRight(service.Str(cfg, "oidc_base_url"), "/"), "https://"+domain) {
+			continue
+		}
+		if port != 0 {
+			return 0, &gatewayConflict{}
+		}
+		port = int(service.Num(cfg, "oidc_http_port", 0))
+	}
+	return port, nil
+}
+
+type gatewayConflict struct{}
+
+func (*gatewayConflict) Error() string {
+	return "当前域名存在多条运行中的 OIDC 专线，请先保留一条"
+}
+
+func (s *Server) identityGateway(c *gin.Context) {
+	status := tlsservice.Status()
+	if !status.Valid || status.Mode != "nginx" || status.RestartRequired || nginxgateway.Stage() != "https" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请先完成 Nginx HTTPS 入口配置"})
+		return
+	}
+	port, err := authGatewayPort(status.Domain)
+	if err != nil {
+		c.JSON(400, gin.H{"error": err.Error()})
+		return
+	}
+	if err := nginxgateway.RefreshAuth(status.Domain, s.router.Routes(), port); err != nil {
+		c.JSON(500, gin.H{"error": err.Error()})
+		return
+	}
+	store.Audit(c.GetString("username"), "identity_gateway_updated", status.Domain, "")
+	c.JSON(200, gin.H{"ok": true, "identity_route": true, "auth_route": port != 0, "auth_port": port})
+}