feat(cors): ✨ enhance CORS configuration with dynamic origins

* Update CORSConfig to allow dynamic origins based on server instances.
* Add ExternalURLs field to ServerInstanceConfig for additional CORS support.
* Implement GetIPs function to retrieve non-local IP addresses for CORS.

pkg/config/config.go

@@ -73,6 +73,9 @@ type ServerInstanceConfig struct {
 
 	// Tags for organization and filtering
 	Tags map[string]string `mapstructure:"tags"`
+
+	// ExternalURLs are additional URLs that this server instance is accessible from (for CORS) for proxy setups
+	ExternalURLs []string `mapstructure:"external_urls"`
 }
 
 // TracingConfig holds OpenTelemetry tracing configuration

pkg/config/manager.go

@@ -12,6 +12,16 @@ type Manager struct {
 	v *viper.Viper
 }
 
+var configInstance *Manager
+
+// GetConfigManager returns a singleton configuration manager instance
+func GetConfigManager() *Manager {
+	if configInstance == nil {
+		configInstance = NewManager()
+	}
+	return configInstance
+}
+
 // NewManager creates a new configuration manager with defaults
 func NewManager() *Manager {
 	v := viper.New()
@@ -32,7 +42,8 @@ func NewManager() *Manager {
 	// Set default values
 	setDefaults(v)
 
-	return &Manager{v: v}
+	configInstance = &Manager{v: v}
+	return configInstance
 }
 
 // NewManagerWithOptions creates a new configuration manager with custom options

pkg/config/server.go

@@ -2,6 +2,9 @@ package config
 
 import (
 	"fmt"
+	"net"
+	"os"
+	"strings"
 )
 
 // ApplyGlobalDefaults applies global server defaults to this instance
@@ -105,3 +108,42 @@ func (sc *ServersConfig) GetDefault() (*ServerInstanceConfig, error) {
 
 	return &instance, nil
 }
+
+// GetIPs - GetIP for pc
+func GetIPs() (string, string, []net.IP) {
+	defer func() {
+		if err := recover(); err != nil {
+			fmt.Println("Recovered in GetIPs", err)
+		}
+	}()
+	hostname, _ := os.Hostname()
+	ipaddrlist := make([]net.IP, 0)
+	iplist := ""
+	addrs, err := net.LookupIP(hostname)
+	if err != nil {
+		return hostname, iplist, ipaddrlist
+	}
+
+	for _, a := range addrs {
+		//cfg.LogInfo("\nFound IP Host Address: %s", a)
+		if strings.Contains(a.String(), "127.0.0.1") {
+			continue
+		}
+		iplist = fmt.Sprintf("%s,%s", iplist, a)
+		ipaddrlist = append(ipaddrlist, a)
+	}
+	if iplist == "" {
+		iff, _ := net.InterfaceAddrs()
+		for _, a := range iff {
+			//cfg.LogInfo("\nFound IP Address: %s", a)
+			if strings.Contains(a.String(), "127.0.0.1") {
+				continue
+			}
+			iplist = fmt.Sprintf("%s,%s", iplist, a)
+
+		}
+
+	}
+	iplist = strings.TrimLeft(iplist, ",")
+	return hostname, iplist, ipaddrlist
+}