Register/sign-in anonymously into firebase

android/build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.6.10'
+    ext.kotlin_version = '1.9.23'
     repositories {
         google()
         mavenCentral()

lib/src/services/auth.dart

@@ -0,0 +1,14 @@
+import 'package:firebase_auth/firebase_auth.dart';
+
+/// Manages authorization processes for the app
+class Auth {
+  /// [FirebaseAuth] instance used to access auth functionality.
+  final FirebaseAuth auth;
+
+  Auth({required this.auth});
+
+  ///  Anonymously add or sign in the user into firebase.
+  Future<void> signIn() async {
+    final UserCredential userCredential = await auth.signInAnonymously();
+  }
+}

lib/src/services/run_session.dart

@@ -1,6 +1,8 @@
 import 'package:digit_span_tasks/digit_span_tasks.dart';
+import 'package:firebase_auth/firebase_auth.dart';
 import 'package:flutter/material.dart';
 import 'package:mdigit_span_tasks_ema/src/data_manager/session_id_creator.dart';
+import 'package:mdigit_span_tasks_ema/src/services/auth.dart';
 import 'package:mdigit_span_tasks_ema/src/services/data_processor.dart';
 
 import '../participant_info/participant_info_dialog.dart';
@@ -27,6 +29,8 @@ void runSession(
     sessionID: sessionID,
   );
 
+  await Auth(auth: FirebaseAuth.instance).signIn();
+
   await processData(
     participantID: participantID,
     sessionID: sessionID,

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -6,12 +6,14 @@ import FlutterMacOS
 import Foundation
 
 import cloud_firestore
+import firebase_auth
 import firebase_core
 import shared_preferences_foundation
 import sqlite3_flutter_libs
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   FLTFirebaseFirestorePlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseFirestorePlugin"))
+  FLTFirebaseAuthPlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseAuthPlugin"))
   FLTFirebaseCorePlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseCorePlugin"))
   SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
   Sqlite3FlutterLibsPlugin.register(with: registry.registrar(forPlugin: "Sqlite3FlutterLibsPlugin"))

pubspec.yaml

@@ -24,12 +24,14 @@ dependencies:
       ref: v0.3.0
   firebase_core: ^2.28.0
   cloud_firestore: ^4.16.0
+  firebase_auth: ^4.19.0
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
 
   flutter_lints: ^2.0.0
+  firebase_auth_mocks: ^0.13.0
 
 flutter:
   uses-material-design: true

test/src/services/auth_test.dart

@@ -0,0 +1,14 @@
+import 'package:firebase_auth_mocks/firebase_auth_mocks.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mdigit_span_tasks_ema/src/services/auth.dart';
+
+void main() {
+  test(
+    "Auth.signIn() does not throw exceptions",
+    () async {
+      final Auth auth = Auth(auth: MockFirebaseAuth());
+      await auth.signIn();
+      expect(auth.signIn, returnsNormally);
+    },
+  );
+}

windows/flutter/generated_plugin_registrant.cc

@@ -7,13 +7,16 @@
 #include "generated_plugin_registrant.h"
 
 #include <cloud_firestore/cloud_firestore_plugin_c_api.h>
+#include <firebase_auth/firebase_auth_plugin_c_api.h>
 #include <firebase_core/firebase_core_plugin_c_api.h>
 #include <permission_handler_windows/permission_handler_windows_plugin.h>
 #include <sqlite3_flutter_libs/sqlite3_flutter_libs_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   CloudFirestorePluginCApiRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("CloudFirestorePluginCApi"));
+  FirebaseAuthPluginCApiRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("FirebaseAuthPluginCApi"));
   FirebaseCorePluginCApiRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FirebaseCorePluginCApi"));
   PermissionHandlerWindowsPluginRegisterWithRegistrar(

windows/flutter/generated_plugins.cmake

@@ -4,6 +4,7 @@
 
 list(APPEND FLUTTER_PLUGIN_LIST
   cloud_firestore
+  firebase_auth
   firebase_core
   permission_handler_windows
   sqlite3_flutter_libs