Enable OIDC support (#1541)

Notification content is bypassed for now.

ElementX/Sources/Screens/Settings/AccountSettings/OIDCAccountSettingsPresenter.swift

@@ -0,0 +1,51 @@
+//
+// Copyright 2023 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 AuthenticationServices
+
+/// Presents a web authentication session that will display the user's account settings page.
+///
+/// A web authentication session is used so that the same session used for login is available
+/// meaning that the user doesn't need to sign in again. `SFSafariViewController` doesn't
+/// have access to this session, and for some reason `prefersEphemeralWebBrowserSession`
+/// isn't sharing the session back to Safari.
+@MainActor
+class OIDCAccountSettingsPresenter: NSObject {
+    private let accountURL: URL
+    private let presentationAnchor: UIWindow
+    private let oidcRedirectURL: URL
+    
+    init(accountURL: URL, presentationAnchor: UIWindow) {
+        self.accountURL = accountURL
+        self.presentationAnchor = presentationAnchor
+        oidcRedirectURL = ServiceLocator.shared.settings.oidcRedirectURL
+        super.init()
+    }
+    
+    /// Presents a web authentication session for the supplied data.
+    func start() {
+        let session = ASWebAuthenticationSession(url: accountURL, callbackURLScheme: oidcRedirectURL.scheme) { _, _ in }
+        session.prefersEphemeralWebBrowserSession = false
+        session.presentationContextProvider = self
+        session.start()
+    }
+}
+
+// MARK: ASWebAuthenticationPresentationContextProviding
+
+extension OIDCAccountSettingsPresenter: ASWebAuthenticationPresentationContextProviding {
+    func presentationAnchor(for session: ASWebAuthenticationSession) -> ASPresentationAnchor { presentationAnchor }
+}