feat: publish Authenticator.user (#10)

* feat: publish Authenticator.user

* test: add AuthException tests

* style: fix text length

packages/flutterfire_authenticator/lib/src/auth_exception.dart

@@ -8,10 +8,10 @@ sealed class AuthException implements Exception {
       // Google認証でキャンセルした場合は「cancel」が返ってくる
       // Apple認証でキャンセルした場合は「canceled」が返ってくる
       'cancel' || 'canceled' => const AuthCancelled(),
-      'requires-recent-login' => const AuthRequiresReLogin(),
+      'requires-recent-login' => const AuthRequiresRecentSignIn(),
       'invalid-phone-number' => const AuthInvalidPhoneNumber(),
       'credential-already-in-use' => const AuthCredentialAlreadyInUse(),
-      'network-request-failed' => const AuthNetworkError(),
+      'network-request-failed' => const AuthFailedNetworkRequest(),
       // 'email-already-in-use' => const ,
       // 'provider-already-linked' => const ,
       // 'too-many-requests' => const ,
@@ -35,8 +35,8 @@ class AuthCancelled implements AuthException {
   String get message => '認証がキャンセルされました';
 }
 
-class AuthRequiresReLogin implements AuthException {
-  const AuthRequiresReLogin();
+class AuthRequiresRecentSignIn implements AuthException {
+  const AuthRequiresRecentSignIn();
 
   @override
   String get message => '再ログインが必要です';
@@ -56,8 +56,8 @@ class AuthCredentialAlreadyInUse implements AuthException {
   String get message => 'この認証情報はすでに使用されています';
 }
 
-class AuthNetworkError implements AuthException {
-  const AuthNetworkError();
+class AuthFailedNetworkRequest implements AuthException {
+  const AuthFailedNetworkRequest();
 
   @override
   String get message => 'ネットワークエラーが発生しました';
@@ -69,3 +69,10 @@ class AuthUndefinedError implements AuthException {
   @override
   String get message => '予期せぬエラーが発生しました';
 }
+
+class AuthRequiresSignIn implements AuthException {
+  const AuthRequiresSignIn();
+
+  @override
+  String get message => '予期せぬエラーが発生しました';
+}

packages/flutterfire_authenticator/lib/src/authenticator.dart

@@ -26,13 +26,12 @@ class Authenticator {
   final GoogleAuthenticator _googleAuth;
   final PhoneAuthenticator _phoneAuth;
 
-  /// 現在サインイン中のユーザー。Null Assertionを使用しているので、
-  /// `requireUser` にリネームした方が良さそう。
-  User get _user => _auth.currentUser!;
+  /// 現在サインイン中のユーザー。サインインしていない場合はnullを返す。
+  User? get user => _auth.currentUser;
 
   /// 現ユーザーのJWT(JSON Web Token)を非同期で取得する。
   /// 未サインイン時など、現ユーザーが存在しない場合はnullを返す。
-  Future<String?>? get fetchJsonWebToken => _auth.currentUser?.getIdToken();
+  Future<String?>? get fetchJwt => _auth.currentUser?.getIdToken();
 
   /// 匿名サインイン
   Future<UserCredential> signInAnonymously() async {
@@ -111,15 +110,19 @@ class Authenticator {
 
   /// アカウントを削除する
   Future<void> deleteAccount() async {
+    final user = this.user;
+    if (user == null) {
+      throw const AuthRequiresSignIn();
+    }
     try {
       // アカウントを削除実行
-      await _user.delete();
+      await user.delete();
     } on FirebaseAuthException catch (exception) {
       final e = AuthException.fromError(exception);
-      if (e is AuthRequiresReLogin) {
+      if (e is AuthRequiresRecentSignIn) {
         // 再認証の後、再度実行する
         await _reauthenticate();
-        await _user.delete();
+        await user.delete();
       } else {
         throw e;
       }

packages/flutterfire_authenticator/test/src/auth_exception_test.dart

@@ -0,0 +1,55 @@
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutterfire_authenticator/authenticator.dart';
+
+void main() {
+  group('Constructor', () {
+    test('AuthCancelled instance is created from the "cancel"', () {
+      final e = FirebaseAuthException(code: 'cancel');
+      final sut = AuthException.fromError(e);
+      expect(sut, isA<AuthCancelled>());
+    });
+
+    test('AuthCancelled instance is created from the "canceled"', () {
+      final e = FirebaseAuthException(code: 'cancel');
+      final sut = AuthException.fromError(e);
+      expect(sut, isA<AuthCancelled>());
+    });
+
+    test(
+      'AuthCancelled instance is created from the "requires-recent-login"',
+      () {
+        final e = FirebaseAuthException(code: 'requires-recent-login');
+        final sut = AuthException.fromError(e);
+        expect(sut, isA<AuthRequiresRecentSignIn>());
+      },
+    );
+
+    test(
+      'AuthCancelled instance is created from the "invalid-phone-number"',
+      () {
+        final e = FirebaseAuthException(code: 'invalid-phone-number');
+        final sut = AuthException.fromError(e);
+        expect(sut, isA<AuthInvalidPhoneNumber>());
+      },
+    );
+
+    test(
+      'AuthCancelled instance is created from the "credential-already-in-use"',
+      () {
+        final e = FirebaseAuthException(code: 'credential-already-in-use');
+        final sut = AuthException.fromError(e);
+        expect(sut, isA<AuthCredentialAlreadyInUse>());
+      },
+    );
+
+    test(
+      'AuthCancelled instance is created from the "network-request-failed"',
+      () {
+        final e = FirebaseAuthException(code: 'network-request-failed');
+        final sut = AuthException.fromError(e);
+        expect(sut, isA<AuthFailedNetworkRequest>());
+      },
+    );
+  });
+}