initial commit

lib/controllers/auth_code_controller.dart

@@ -0,0 +1,17 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:matrixgate/models/matrix_user.dart";
+import "package:riverpod/riverpod.dart";
+
+class AuthCodeController extends Notifier<IMap<String, MatrixUser>> {
+  @override
+  IMap<String, MatrixUser> build() => const IMap.empty();
+
+  void set(String name, MatrixUser user) =>
+      state = state.update(name, (_) => user, ifAbsent: () => user);
+  void remove(String name) => state = state.remove(name);
+
+  static final provider =
+      NotifierProvider<AuthCodeController, IMap<String, MatrixUser>>(
+        AuthCodeController.new,
+      );
+}