From fc3704eb09cb81b68f71b4c8242d3a74cc627016 Mon Sep 17 00:00:00 2001
From: SBiOSoftWhare <steveb@matrix.org>
Date: Wed, 3 Feb 2021 11:34:33 +0100
Subject: [PATCH] Reauthentication: Add ReauthFallBackViewController that
 enables to authenticate with UIA fallback.

---
 .../ReauthFallBackViewController.swift        | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Riot/Modules/Reauthentication/ReauthFallBackViewController.swift

diff --git a/Riot/Modules/Reauthentication/ReauthFallBackViewController.swift b/Riot/Modules/Reauthentication/ReauthFallBackViewController.swift
new file mode 100644
index 000000000..130e5a862
--- /dev/null
+++ b/Riot/Modules/Reauthentication/ReauthFallBackViewController.swift
@@ -0,0 +1,78 @@
+//
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import UIKit
+
+/// View controller used for User-Interactive Authentication fallback (https://matrix.org/docs/spec/client_server/latest#fallback)
+final class ReauthFallBackViewController: AuthFallBackViewController, Themable {
+    
+    // MARK: - Properties
+                    
+    // MARK: Public
+    
+    var didValidate: (() -> Void)?
+    var didCancel: (() -> Void)?
+    
+    // MARK: Private
+    
+    private var theme: Theme = ThemeService.shared().theme
+    
+    // MARK: - Life cycle
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        // Do any additional setup after loading the view.
+        self.setupNavigationBar()
+        self.registerThemeServiceDidChangeThemeNotification()
+        self.update(theme: self.theme)
+    }
+    
+    // MARK: - Public
+    
+    func update(theme: Theme) {
+        self.theme = theme
+                
+        if let navigationBar = self.navigationController?.navigationBar {
+            theme.applyStyle(onNavigationBar: navigationBar)
+        }
+    }
+    
+    // MARK: - Private
+    
+    private func registerThemeServiceDidChangeThemeNotification() {
+        NotificationCenter.default.addObserver(self, selector: #selector(themeDidChange), name: .themeServiceDidChangeTheme, object: nil)
+    }
+    
+    @objc private func themeDidChange() {
+        self.update(theme: ThemeService.shared().theme)
+    }
+    
+    private func setupNavigationBar() {
+        let doneBarButtonItem = MXKBarButtonItem(title: VectorL10n.close, style: .plain) { [weak self] in
+            self?.didValidate?()
+        }        
+        self.navigationItem.leftBarButtonItem = doneBarButtonItem
+    }
+}
+
+// MARK: - UIAdaptivePresentationControllerDelegate
+extension ReauthFallBackViewController: UIAdaptivePresentationControllerDelegate {
+    
+    func presentationControllerDidDismiss(_ presentationController: UIPresentationController) {
+        self.didCancel?()
+    }
+}