add support for inter-node communications

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/httpd/auth_utils.go

@@ -52,6 +52,7 @@ const (
 	claimUsernameKey                = "username"
 	claimPermissionsKey             = "permissions"
 	claimAPIKey                     = "api_key"
+	claimNodeID                     = "node_id"
 	claimMustSetSecondFactorKey     = "2fa_required"
 	claimRequiredTwoFactorProtocols = "2fa_protos"
 	claimHideUserPageSection        = "hus"
@@ -74,6 +75,7 @@ type jwtTokenClaims struct {
 	Signature                  string
 	Audience                   []string
 	APIKeyID                   string
+	NodeID                     string
 	MustSetTwoFactorAuth       bool
 	RequiredTwoFactorProtocols []string
 	HideUserPageSections       int
@@ -97,6 +99,9 @@ func (c *jwtTokenClaims) asMap() map[string]any {
 	if c.APIKeyID != "" {
 		claims[claimAPIKey] = c.APIKeyID
 	}
+	if c.NodeID != "" {
+		claims[claimNodeID] = c.NodeID
+	}
 	claims[jwt.SubjectKey] = c.Signature
 	if c.MustSetTwoFactorAuth {
 		claims[claimMustSetSecondFactorKey] = c.MustSetTwoFactorAuth
@@ -157,6 +162,13 @@ func (c *jwtTokenClaims) Decode(token map[string]any) {
 		}
 	}
 
+	if val, ok := token[claimNodeID]; ok {
+		switch v := val.(type) {
+		case string:
+			c.NodeID = v
+		}
+	}
+
 	permissions := token[claimPermissionsKey]
 	c.Permissions = c.decodeSliceString(permissions)