feat: Adding extraHeaders in RegisterParams, exposing existing functionality via UaSettings() (#432)

Author: luan-evangelista

lib/src/config.dart

@@ -39,6 +39,7 @@ class Settings {
   bool? register = true;
   int? register_expires = 600;
   dynamic registrar_server;
+  List<String>? register_extra_headers;
   Map<String, dynamic>? register_extra_contact_uri_params;
 
   // Dtmf mode
@@ -237,6 +238,11 @@ class Checks {
         dst!.registrar_server = parsed;
       }
     },
+    'register_extra_headers': (src, dst) {
+      var register_extra_headers = src?.register_extra_headers;
+      if (register_extra_headers == null) return;
+      dst?.register_extra_headers = register_extra_headers;
+    },
     'register_extra_contact_uri_params': (Settings src, Settings? dst) {
       Map<String, dynamic>? register_extra_contact_uri_params =
           src.register_extra_contact_uri_params;

lib/src/registrator.dart

@@ -54,7 +54,7 @@ class Registrator {
     _contact += ';+sip.ice';
 
     // Custom headers for REGISTER and un-REGISTER.
-    _extraHeaders = <String>[];
+    _extraHeaders = ua.configuration.register_extra_headers;
 
     // Custom Contact header params for REGISTER and un-REGISTER.
     _extraContactParams = '';

lib/src/sip_ua_helper.dart

@@ -153,6 +153,7 @@ class SIPUAHelper extends EventManager {
     _settings.user_agent = uaSettings.userAgent ?? DartSIP_C.USER_AGENT;
     _settings.register = uaSettings.register;
     _settings.register_expires = uaSettings.register_expires;
+    _settings.register_extra_headers = uaSettings.registerParams.extraHeaders;
     _settings.register_extra_contact_uri_params =
         uaSettings.registerParams.extraContactUriParams;
     _settings.dtmf_mode = uaSettings.dtmfMode;
@@ -683,6 +684,7 @@ class RegisterParams {
   /// Allow extra headers and Contact Params to be sent on REGISTER
   /// Mainly used for RFC8599 Support
   /// https://github.com/cloudwebrtc/dart-sip-ua/issues/89
+  List<String> extraHeaders = [];
   Map<String, dynamic> extraContactUriParams = <String, dynamic>{};
 }