Allows for the select_account prompt value to be used by not clea…

…ring cookies if user wishes not to on a logout (#331)

* WIP: getting select_account to work

* Added cookies to the webview for mobile

* Adjusted `config.dart` to account for new `prompt` value

lib/aad_oauth.dart

@@ -37,8 +37,8 @@ class AadOAuth {
   Future<String?> getIdToken() async => _coreOAuth.getIdToken();
 
   /// Perform Azure AD logout.
-  Future<void> logout({bool showWebPopup = true}) async =>
-      _coreOAuth.logout(showPopup: showWebPopup);
+  Future<void> logout({bool showWebPopup = true, bool clearCookies = true}) async =>
+      _coreOAuth.logout(showPopup: showWebPopup, clearCookies: clearCookies);
 
   /// Checks if MSAL has cached information
   Future<bool> get hasCachedAccountInformation async =>

lib/helper/core_oauth.dart

@@ -21,7 +21,7 @@ class CoreOAuth {
           errorType: ErrorType.unsupported,
           message: 'Unsupported silentlyLogin');
 
-  Future<void> logout({bool showPopup = true}) async =>
+  Future<void> logout({bool showPopup = true, bool clearCookies = true}) async =>
       throw UnsupportedFailure(
           errorType: ErrorType.unsupported, message: 'Unsupported logout');
 
@@ -48,7 +48,7 @@ class MockCoreOAuth extends CoreOAuth {
       Right(Token(accessToken: mockAccessToken));
 
   @override
-  Future<void> logout({bool showPopup = true}) async {}
+  Future<void> logout({bool showPopup = true, bool clearCookies = true}) async {}
 
   @override
   Future<bool> get hasCachedAccountInformation async => true;

lib/helper/mobile_oauth.dart

@@ -102,9 +102,11 @@ class MobileOAuth extends CoreOAuth {
 
   /// Perform Azure AD logout.
   @override
-  Future<void> logout({bool showPopup = true}) async {
+  Future<void> logout({bool showPopup = true, bool clearCookies = true}) async {
     await _authStorage.clear();
-    await _requestCode.clearCookies();
+    if (clearCookies) {
+      await _requestCode.clearCookies();
+    }
   }
 
   @override

lib/helper/web_oauth.dart

@@ -132,7 +132,7 @@ class WebOAuth extends CoreOAuth {
   }
 
   @override
-  Future<void> logout({bool showPopup = true}) async {
+  Future<void> logout({bool showPopup = true, bool clearCookies = true}) async {
     final completer = Completer<void>();
 
     jsLogout(

lib/model/config.dart

@@ -57,7 +57,9 @@ class Config {
   final String? state;
 
   /// Indicates the type of user interaction that is required.
-  /// The only valid values at this time are *login*, *none*, and *consent*.
+  /// The only valid values at this time are *login*, *none*, *consent*, and *select_account*.
+  /// If *select_account* is wanting to be used, the user must have at least signed in once and
+  /// when logging out, the *clearCookies* value must be false.
   final String? prompt;
 
   /// Used to secure authorization code grants via Proof Key for Code Exchange (PKCE).

lib/request_code.dart

@@ -11,6 +11,7 @@ class RequestCode {
   final AuthorizationRequest _authorizationRequest;
   final String _redirectUriHost;
   late NavigationDelegate _navigationDelegate;
+  late WebViewCookieManager _cookieManager;
   String? _code;
 
   RequestCode(Config config)
@@ -20,6 +21,7 @@ class RequestCode {
     _navigationDelegate = NavigationDelegate(
       onNavigationRequest: _onNavigationRequest,
     );
+    _cookieManager = WebViewCookieManager();
   }
 
   Future<String?> requestCode() async {
@@ -100,7 +102,7 @@ class RequestCode {
   }
 
   Future<void> clearCookies() async {
-    await WebViewCookieManager().clearCookies();
+    await _cookieManager.clearCookies();
   }
 
   String _constructUrlParams() => _mapToQueryParams(