mirror of
https://github.com/vector-im/element-ios.git
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224 lines
8.4 KiB
Swift
224 lines
8.4 KiB
Swift
/*
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Copyright 2020 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import Foundation
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enum AuthenticatedSessionViewControllerFactoryError: Int, Error, CustomNSError {
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case flowNotSupported = 0
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// MARK: - CustomNSError
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static let errorDomain = "AuthenticatedSessionViewControllerFactoryErrorDomain"
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var errorCode: Int { return self.rawValue }
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var errorUserInfo: [String: Any] {
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let userInfo: [String: Any]
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switch self {
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case .flowNotSupported:
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userInfo = [NSLocalizedDescriptionKey: VectorL10n.authenticatedSessionFlowNotSupported]
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}
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return userInfo
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}
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}
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/// This class creates view controllers that can handle an authentication flow for given requests.
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@objcMembers
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final class AuthenticatedSessionViewControllerFactory: NSObject {
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// MARK: - Constants
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// MARK: - Properties
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// MARK: Private
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private let session: MXSession
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// MARK: Public
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// MARK: - Setup
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init(session: MXSession) {
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self.session = session
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}
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// MARK: - Public methods
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/// Create a view controller to handle an authentication flow for a given request.
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///
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/// - Parameters:
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/// - path: the request path.
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/// - httpMethod: the request http method.
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/// - title: the title to use in the view controller.
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/// - message: the information to display in the view controller.
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/// - onViewController: the block called when the view controller is ready. The caller must display it.
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/// - onAuthenticated: the block called when the user finished to enter their credentials.
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/// - onCancelled: the block called when the user cancelled the authentication.
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/// - onFailure: the blocked called on error.
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@discardableResult
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func viewController(forPath path: String,
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httpMethod: String,
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title: String?,
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message: String?,
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onViewController: @escaping (UIViewController) -> Void,
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onAuthenticated: @escaping ([String: Any]) -> Void,
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onCancelled: @escaping () -> Void,
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onFailure: @escaping (Error) -> Void) -> MXHTTPOperation {
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// Get the authentication flow required for this API
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return session.matrixRestClient.authSessionForRequest(withMethod: httpMethod, path: path, parameters: [:], success: { [weak self] (authenticationSession) in
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guard let self = self else {
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return
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}
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guard let authenticationSession = authenticationSession, let flows = authenticationSession.flows else {
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onFailure(AuthenticatedSessionViewControllerFactoryError.flowNotSupported)
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return
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}
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// Return the corresponding VC
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if self.hasPasswordFlow(inFlows: flows) {
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let authViewController = self.createPasswordViewController(title: title,
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message: message,
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authenticationSession: authenticationSession,
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onAuthenticated: onAuthenticated,
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onCancelled: onCancelled,
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onFailure: onFailure)
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onViewController(authViewController)
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} else {
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// Flow not supported yet
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onFailure(AuthenticatedSessionViewControllerFactoryError.flowNotSupported)
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}
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}, failure: { (error) in
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guard let error = error else {
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return
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}
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onFailure(error)
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})
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}
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/// Check if we support the authentication flow for a given request.
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///
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/// - Parameters:
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/// - path: the request path.
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/// - httpMethod: the request http method.
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/// - onCancelled: the block called when the user cancelled the authentication.
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/// - onFailure: the blocked called on error.
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func hasSupport(forPath path: String,
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httpMethod: String,
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success: @escaping (Bool) -> Void,
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failure: @escaping (Error) -> Void) -> MXHTTPOperation {
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// Get the authentication flow required for this API
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return session.matrixRestClient.authSessionForRequest(withMethod: httpMethod, path: path, parameters: [:], success: { [weak self] (authenticationSession) in
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guard let self = self else {
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return
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}
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guard let authenticationSession = authenticationSession, let flows = authenticationSession.flows else {
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success(false)
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return
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}
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// Return the corresponding VC
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if self.hasPasswordFlow(inFlows: flows) {
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success(true)
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} else {
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// Flow not supported yet
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success(false)
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}
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}, failure: { (error) in
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guard let error = error else {
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return
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}
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failure(error)
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})
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}
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// MARK: - Private methods
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// MARK: - Password flow
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private func hasPasswordFlow(inFlows flows: [MXLoginFlow]) -> Bool {
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for flow in flows {
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if flow.type == kMXLoginFlowTypePassword || flow.stages.contains(kMXLoginFlowTypePassword) {
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return true
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}
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}
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return false
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}
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private func createPasswordViewController(
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title: String?,
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message: String?,
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authenticationSession: MXAuthenticationSession,
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onAuthenticated: @escaping ([String: Any]) -> Void,
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onCancelled: @escaping () -> Void,
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onFailure: @escaping (Error) -> Void) -> UIViewController {
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// Use a simple UIAlertController as before
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let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
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alertController.addTextField { (textField) in
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textField.isSecureTextEntry = true
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textField.placeholder = VectorL10n.authPasswordPlaceholder
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textField.keyboardType = .default
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}
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alertController.addAction(UIAlertAction(title: Bundle.mxk_localizedString(forKey: "cancel"), style: .cancel, handler: { _ in
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onCancelled()
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}))
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alertController.addAction(UIAlertAction(title: Bundle.mxk_localizedString(forKey: "ok"), style: .default, handler: { _ in
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guard let password = alertController.textFields?.first?.text else {
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// Should not happen
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return
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}
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guard let authParams = self.createAuthParams(password: password, authenticationSession: authenticationSession) else {
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onFailure(AuthenticatedSessionViewControllerFactoryError.flowNotSupported)
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return
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}
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onAuthenticated(authParams)
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}))
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return alertController
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}
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private func createAuthParams(password: String,
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authenticationSession: MXAuthenticationSession) -> [String: Any]? {
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guard let userId = self.session.myUserId, let session = authenticationSession.session else {
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return nil
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}
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return [
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"type": kMXLoginFlowTypePassword,
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"session": session,
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"user": userId,
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"password": password
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]
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}
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}
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