mirror of https://github.com/oxen-io/session-ios
Merge branch 'charlesmchen/screenLock'
Matthew Chen
7 years ago
commit
70e95b085e
@ -0,0 +1,295 @@
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//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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import LocalAuthentication
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@objc public class OWSScreenLock: NSObject {
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public enum OWSScreenLockOutcome {
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case success
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case cancel
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// case userCancel
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// case otherCancel
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case failure(error:String)
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// case permanentFailure(error:String)
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}
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@objc public let screenLockTimeouts = [
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5 * kSecondInterval,
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15 * kSecondInterval,
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30 * kSecondInterval,
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1 * kMinuteInterval,
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5 * kMinuteInterval,
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0
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]
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@objc public static let ScreenLockDidChange = Notification.Name("ScreenLockDidChange")
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let primaryStorage: OWSPrimaryStorage
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let dbConnection: YapDatabaseConnection
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private let OWSScreenLock_Collection = "OWSScreenLock_Collection"
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private let OWSScreenLock_Key_IsScreenLockEnabled = "OWSScreenLock_Key_IsScreenLockEnabled"
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private let OWSScreenLock_Key_ScreenLockTimeoutSeconds = "OWSScreenLock_Key_ScreenLockTimeoutSeconds"
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// MARK - Singleton class
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@objc(sharedManager)
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public static let shared = OWSScreenLock()
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private override init() {
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self.primaryStorage = OWSPrimaryStorage.shared()
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self.dbConnection = self.primaryStorage.newDatabaseConnection()
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super.init()
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SwiftSingletons.register(self)
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}
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// MARK: - Properties
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@objc public func isScreenLockEnabled() -> Bool {
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AssertIsOnMainThread()
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if !OWSStorage.isStorageReady() {
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owsFail("\(logTag) accessed screen lock state before storage is ready.")
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return false
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}
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return self.dbConnection.bool(forKey: OWSScreenLock_Key_IsScreenLockEnabled, inCollection: OWSScreenLock_Collection, defaultValue: false)
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}
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private func setIsScreenLockEnabled(value: Bool) {
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AssertIsOnMainThread()
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assert(OWSStorage.isStorageReady())
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self.dbConnection.setBool(value, forKey: OWSScreenLock_Key_IsScreenLockEnabled, inCollection: OWSScreenLock_Collection)
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NotificationCenter.default.postNotificationNameAsync(OWSScreenLock.ScreenLockDidChange, object: nil)
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}
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@objc public func screenLockTimeout() -> TimeInterval {
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AssertIsOnMainThread()
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if !OWSStorage.isStorageReady() {
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owsFail("\(logTag) accessed screen lock state before storage is ready.")
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return 0
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}
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let defaultTimeout = screenLockTimeouts[0]
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return self.dbConnection.double(forKey: OWSScreenLock_Key_ScreenLockTimeoutSeconds, inCollection: OWSScreenLock_Collection, defaultValue: defaultTimeout)
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}
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@objc public func setScreenLockTimeout(_ value: TimeInterval) {
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AssertIsOnMainThread()
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assert(OWSStorage.isStorageReady())
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self.dbConnection.setDouble(value, forKey: OWSScreenLock_Key_ScreenLockTimeoutSeconds, inCollection: OWSScreenLock_Collection)
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NotificationCenter.default.postNotificationNameAsync(OWSScreenLock.ScreenLockDidChange, object: nil)
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}
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// MARK: - Methods
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// On failure, completion is called with an error argument.
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// On success or cancel, completion is called with nil argument.
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// Success and cancel can be differentiated by consulting
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// isScreenLockEnabled.
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@objc public func tryToEnableScreenLock(completion: @escaping ((Error?) -> Void)) {
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tryToVerifyLocalAuthentication(localizedReason: NSLocalizedString("SCREEN_LOCK_REASON_ENABLE_SCREEN_LOCK",
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comment: "Description of how and why Signal iOS uses Touch ID/Face ID/Phone Passcode to enable 'screen lock'."),
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completion: { (outcome: OWSScreenLockOutcome) in
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AssertIsOnMainThread()
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switch outcome {
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case .failure(let error):
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completion(self.authenticationError(errorDescription: error))
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case .success:
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self.setIsScreenLockEnabled(value: true)
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completion(nil)
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case .cancel:
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completion(nil)
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}
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})
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}
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// On failure, completion is called with an error argument.
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// On success or cancel, completion is called with nil argument.
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// Success and cancel can be differentiated by consulting
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// isScreenLockEnabled.
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@objc public func tryToDisableScreenLock(completion: @escaping ((Error?) -> Void)) {
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tryToVerifyLocalAuthentication(localizedReason: NSLocalizedString("SCREEN_LOCK_REASON_DISABLE_SCREEN_LOCK",
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comment: "Description of how and why Signal iOS uses Touch ID/Face ID/Phone Passcode to disable 'screen lock'."),
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completion: { (outcome: OWSScreenLockOutcome) in
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AssertIsOnMainThread()
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switch outcome {
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case .failure(let error):
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completion(self.authenticationError(errorDescription: error))
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case .success:
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self.setIsScreenLockEnabled(value: false)
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completion(nil)
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case .cancel:
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completion(nil)
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}
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})
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}
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@objc public func tryToUnlockScreenLock(success: @escaping (() -> Void),
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failure: @escaping ((Error) -> Void),
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cancel: @escaping (() -> Void)) {
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tryToVerifyLocalAuthentication(localizedReason: NSLocalizedString("SCREEN_LOCK_REASON_UNLOCK_SCREEN_LOCK",
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comment: "Description of how and why Signal iOS uses Touch ID/Face ID/Phone Passcode to unlock 'screen lock'."),
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completion: { (outcome: OWSScreenLockOutcome) in
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AssertIsOnMainThread()
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switch outcome {
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case .failure(let error):
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failure(self.authenticationError(errorDescription: error))
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case .success:
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success()
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case .cancel:
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cancel()
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}
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})
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}
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// On failure, completion is called with an error argument.
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// On success or cancel, completion is called with nil argument.
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// Success and cancel can be differentiated by consulting
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// isScreenLockEnabled.
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private func tryToVerifyLocalAuthentication(localizedReason: String,
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completion completionParam: @escaping ((OWSScreenLockOutcome) -> Void)) {
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// Ensure completion is always called on the main thread.
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let completion = { (outcome: OWSScreenLockOutcome) in
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switch outcome {
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case .failure(let error):
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Logger.error("\(self.logTag) local authentication failed with error: \(error)")
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default:
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break
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}
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DispatchQueue.main.async {
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completionParam(outcome)
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}
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}
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let context = screenLockContext()
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let defaultErrorDescription = NSLocalizedString("SCREEN_LOCK_ENABLE_UNKNOWN_ERROR",
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comment: "Indicates that an unknown error occurred while using Touch ID/Face ID/Phone Passcode.")
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var authError: NSError?
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let canEvaluatePolicy = context.canEvaluatePolicy(.deviceOwnerAuthentication, error: &authError)
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if !canEvaluatePolicy || authError != nil {
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Logger.error("\(logTag) could not determine if local authentication is supported: \(String(describing: authError))")
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let outcome = self.outcomeForLAError(errorParam: authError,
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defaultErrorDescription: defaultErrorDescription)
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switch outcome {
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case .success:
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owsFail("\(self.logTag) local authentication unexpected success")
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completion(.failure(error:defaultErrorDescription))
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case .cancel, .failure:
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completion(outcome)
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}
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return
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}
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context.evaluatePolicy(.deviceOwnerAuthentication, localizedReason: localizedReason) { success, evaluateError in
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if success {
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Logger.info("\(self.logTag) local authentication succeeded.")
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completion(.success)
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} else {
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let outcome = self.outcomeForLAError(errorParam: evaluateError,
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defaultErrorDescription: defaultErrorDescription)
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switch outcome {
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case .success:
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owsFail("\(self.logTag) local authentication unexpected success")
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completion(.failure(error:defaultErrorDescription))
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case .cancel, .failure:
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completion(outcome)
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}
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}
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}
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}
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// MARK: - Outcome
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private func outcomeForLAError(errorParam: Error?, defaultErrorDescription: String) -> OWSScreenLockOutcome {
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if let error = errorParam {
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guard let laError = error as? LAError else {
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return .failure(error:defaultErrorDescription)
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}
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if #available(iOS 11.0, *) {
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switch laError.code {
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case .biometryNotAvailable:
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Logger.error("\(self.logTag) local authentication error: biometryNotAvailable.")
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return .failure(error: NSLocalizedString("SCREEN_LOCK_ERROR_LOCAL_AUTHENTICATION_NOT_AVAILABLE",
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comment: "Indicates that Touch ID/Face ID/Phone Passcode are not available on this device."))
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case .biometryNotEnrolled:
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Logger.error("\(self.logTag) local authentication error: biometryNotEnrolled.")
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return .failure(error: NSLocalizedString("SCREEN_LOCK_ERROR_LOCAL_AUTHENTICATION_NOT_ENROLLED",
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comment: "Indicates that Touch ID/Face ID/Phone Passcode is not configured on this device."))
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case .biometryLockout:
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Logger.error("\(self.logTag) local authentication error: biometryLockout.")
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return .failure(error: NSLocalizedString("SCREEN_LOCK_ERROR_LOCAL_AUTHENTICATION_LOCKOUT",
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comment: "Indicates that Touch ID/Face ID/Phone Passcode is 'locked out' on this device due to authentication failures."))
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default:
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// Fall through to second switch
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break
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}
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}
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switch laError.code {
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case .authenticationFailed:
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Logger.error("\(self.logTag) local authentication error: authenticationFailed.")
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return .failure(error: NSLocalizedString("SCREEN_LOCK_ERROR_LOCAL_AUTHENTICATION_FAILED",
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comment: "Indicates that Touch ID/Face ID/Phone Passcode authentication failed."))
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case .userCancel, .userFallback, .systemCancel, .appCancel:
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Logger.info("\(self.logTag) local authentication cancelled.")
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return .cancel
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case .passcodeNotSet:
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Logger.error("\(self.logTag) local authentication error: passcodeNotSet.")
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return .failure(error: NSLocalizedString("SCREEN_LOCK_ERROR_LOCAL_AUTHENTICATION_PASSCODE_NOT_SET",
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comment: "Indicates that Touch ID/Face ID/Phone Passcode passcode is not set."))
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case .touchIDNotAvailable:
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Logger.error("\(self.logTag) local authentication error: touchIDNotAvailable.")
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return .failure(error: NSLocalizedString("SCREEN_LOCK_ERROR_LOCAL_AUTHENTICATION_NOT_AVAILABLE",
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comment: "Indicates that Touch ID/Face ID/Phone Passcode are not available on this device."))
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case .touchIDNotEnrolled:
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Logger.error("\(self.logTag) local authentication error: touchIDNotEnrolled.")
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return .failure(error: NSLocalizedString("SCREEN_LOCK_ERROR_LOCAL_AUTHENTICATION_NOT_ENROLLED",
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comment: "Indicates that Touch ID/Face ID/Phone Passcode is not configured on this device."))
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case .touchIDLockout:
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Logger.error("\(self.logTag) local authentication error: touchIDLockout.")
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return .failure(error: NSLocalizedString("SCREEN_LOCK_ERROR_LOCAL_AUTHENTICATION_LOCKOUT",
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comment: "Indicates that Touch ID/Face ID/Phone Passcode is 'locked out' on this device due to authentication failures."))
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case .invalidContext:
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owsFail("\(self.logTag) context not valid.")
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break
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case .notInteractive:
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owsFail("\(self.logTag) context not interactive.")
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break
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}
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}
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return .failure(error:defaultErrorDescription)
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}
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private func authenticationError(errorDescription: String) -> Error {
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return OWSErrorWithCodeDescription(.localAuthenticationError,
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errorDescription)
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}
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// MARK: - Context
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private func screenLockContext() -> LAContext {
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let context = LAContext()
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context.touchIDAuthenticationAllowableReuseDuration = TimeInterval(screenLockTimeout())
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return context
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}
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}
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@ -0,0 +1,17 @@
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//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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NS_ASSUME_NONNULL_BEGIN
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@interface OWSScreenLockUI : NSObject
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- (instancetype)init NS_UNAVAILABLE;
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+ (instancetype)sharedManager;
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- (void)setupWithRootWindow:(UIWindow *)rootWindow;
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@end
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NS_ASSUME_NONNULL_END
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@ -0,0 +1,252 @@
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//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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#import "OWSScreenLockUI.h"
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#import "Signal-Swift.h"
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NS_ASSUME_NONNULL_BEGIN
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@interface OWSScreenLockUI ()
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// Unlike UIApplication.applicationState, this state is
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// updated conservatively, e.g. the flag is cleared during
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// "will enter background."
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@property (nonatomic) BOOL appIsInactive;
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@property (nonatomic, nullable) NSDate *appBecameInactiveDate;
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@property (nonatomic) UIWindow *screenBlockingWindow;
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@property (nonatomic) BOOL hasUnlockedScreenLock;
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@property (nonatomic) BOOL isShowingScreenLockUI;
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@end
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#pragma mark -
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@implementation OWSScreenLockUI
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+ (instancetype)sharedManager
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{
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static OWSScreenLockUI *instance = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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instance = [[self alloc] initDefault];
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});
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return instance;
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}
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- (instancetype)initDefault
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{
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self = [super init];
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if (!self) {
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return self;
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}
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[self observeNotifications];
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OWSSingletonAssert();
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return self;
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}
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- (void)dealloc
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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- (void)observeNotifications
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{
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(applicationDidBecomeActive:)
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name:OWSApplicationDidBecomeActiveNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(applicationWillResignActive:)
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name:OWSApplicationWillResignActiveNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(registrationStateDidChange)
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name:RegistrationStateDidChangeNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(screenLockDidChange:)
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name:OWSScreenLock.ScreenLockDidChange
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object:nil];
|
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}
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|
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- (void)setupWithRootWindow:(UIWindow *)rootWindow
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{
|
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OWSAssertIsOnMainThread();
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OWSAssert(rootWindow);
|
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|
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[self prepareScreenProtectionWithRootWindow:rootWindow];
|
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|
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[AppReadiness runNowOrWhenAppIsReady:^{
|
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[self ensureScreenProtection];
|
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}];
|
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}
|
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|
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#pragma mark - Methods
|
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|
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- (void)setAppIsInactive:(BOOL)appIsInactive
|
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{
|
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if (appIsInactive) {
|
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if (!_appIsInactive) {
|
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// Whenever app becomes inactive, clear this state.
|
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self.hasUnlockedScreenLock = NO;
|
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|
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// Note the time when app became inactive.
|
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self.appBecameInactiveDate = [NSDate new];
|
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}
|
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}
|
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|
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_appIsInactive = appIsInactive;
|
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|
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[self ensureScreenProtection];
|
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}
|
||||
|
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- (void)ensureScreenProtection
|
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{
|
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OWSAssertIsOnMainThread();
|
||||
|
||||
if (!AppReadiness.isAppReady) {
|
||||
[AppReadiness runNowOrWhenAppIsReady:^{
|
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[self ensureScreenProtection];
|
||||
}];
|
||||
return;
|
||||
}
|
||||
|
||||
BOOL shouldHaveScreenLock = NO;
|
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if (self.appIsInactive) {
|
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// Don't show 'Screen Lock' if app is inactive.
|
||||
} else if (![TSAccountManager isRegistered]) {
|
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// Don't show 'Screen Lock' if user is not registered.
|
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} else if (!OWSScreenLock.sharedManager.isScreenLockEnabled) {
|
||||
// Don't show 'Screen Lock' if 'Screen Lock' isn't enabled.
|
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} else if (self.hasUnlockedScreenLock) {
|
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// Don't show 'Screen Lock' if 'Screen Lock' has been unlocked.
|
||||
} else if (!self.appBecameInactiveDate) {
|
||||
// Show 'Screen Lock' if app hasn't become inactive yet (just launched).
|
||||
shouldHaveScreenLock = YES;
|
||||
} else {
|
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OWSAssert(self.appBecameInactiveDate);
|
||||
|
||||
NSTimeInterval screenLockInterval = fabs([self.appBecameInactiveDate timeIntervalSinceNow]);
|
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NSTimeInterval screenLockTimeout = OWSScreenLock.sharedManager.screenLockTimeout;
|
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OWSAssert(screenLockInterval >= 0);
|
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OWSAssert(screenLockTimeout >= 0);
|
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if (self.appBecameInactiveDate && screenLockInterval < screenLockTimeout) {
|
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// Don't show 'Screen Lock' if 'Screen Lock' timeout hasn't elapsed.
|
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shouldHaveScreenLock = NO;
|
||||
} else {
|
||||
// Otherwise, show 'Screen Lock'.
|
||||
shouldHaveScreenLock = YES;
|
||||
}
|
||||
}
|
||||
|
||||
// Show 'Screen Protection' if:
|
||||
//
|
||||
// * App is inactive and...
|
||||
// * Either 'Screen Protection' or 'Screen Lock' is enabled.
|
||||
BOOL shouldHaveScreenProtection = (self.appIsInactive
|
||||
&& (Environment.preferences.screenSecurityIsEnabled || OWSScreenLock.sharedManager.isScreenLockEnabled));
|
||||
|
||||
BOOL shouldShowBlockWindow = shouldHaveScreenProtection || shouldHaveScreenLock;
|
||||
DDLogVerbose(@"%@, shouldHaveScreenProtection: %d, shouldHaveScreenLock: %d, shouldShowBlockWindow: %d",
|
||||
self.logTag,
|
||||
shouldHaveScreenProtection,
|
||||
shouldHaveScreenLock,
|
||||
shouldShowBlockWindow);
|
||||
self.screenBlockingWindow.hidden = !shouldShowBlockWindow;
|
||||
|
||||
if (shouldHaveScreenLock) {
|
||||
if (!self.isShowingScreenLockUI) {
|
||||
self.isShowingScreenLockUI = YES;
|
||||
|
||||
[OWSScreenLock.sharedManager tryToUnlockScreenLockWithSuccess:^{
|
||||
DDLogInfo(@"%@ unlock screen lock succeeded.", self.logTag);
|
||||
self.isShowingScreenLockUI = NO;
|
||||
self.hasUnlockedScreenLock = YES;
|
||||
[self ensureScreenProtection];
|
||||
}
|
||||
failure:^(NSError *error) {
|
||||
DDLogInfo(@"%@ unlock screen lock failed.", self.logTag);
|
||||
self.isShowingScreenLockUI = NO;
|
||||
|
||||
[self showScreenLockFailureAlertWithMessage:error.localizedDescription];
|
||||
}
|
||||
cancel:^{
|
||||
DDLogInfo(@"%@ unlock screen lock cancelled.", self.logTag);
|
||||
self.isShowingScreenLockUI = NO;
|
||||
|
||||
// Re-show the unlock UI.
|
||||
[self ensureScreenProtection];
|
||||
}];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
- (void)showScreenLockFailureAlertWithMessage:(NSString *)message
|
||||
{
|
||||
OWSAssertIsOnMainThread();
|
||||
|
||||
[OWSAlerts showAlertWithTitle:NSLocalizedString(@"SCREEN_LOCK_UNLOCK_FAILED",
|
||||
@"Title for alert indicating that screen lock could not be unlocked.")
|
||||
message:message
|
||||
buttonTitle:nil
|
||||
buttonAction:^(UIAlertAction *action) {
|
||||
// After the alert, re-show the unlock UI.
|
||||
[self ensureScreenProtection];
|
||||
}];
|
||||
}
|
||||
|
||||
// 'Screen Blocking' window obscures the app screen:
|
||||
//
|
||||
// * In the app switcher.
|
||||
// * During 'Screen Lock' unlock process.
|
||||
- (void)prepareScreenProtectionWithRootWindow:(UIWindow *)rootWindow
|
||||
{
|
||||
OWSAssertIsOnMainThread();
|
||||
OWSAssert(rootWindow);
|
||||
|
||||
UIWindow *window = [[UIWindow alloc] initWithFrame:rootWindow.bounds];
|
||||
window.hidden = YES;
|
||||
window.opaque = YES;
|
||||
window.userInteractionEnabled = NO;
|
||||
window.windowLevel = CGFLOAT_MAX;
|
||||
window.backgroundColor = UIColor.ows_materialBlueColor;
|
||||
window.rootViewController =
|
||||
[[UIStoryboard storyboardWithName:@"Launch Screen" bundle:nil] instantiateInitialViewController];
|
||||
|
||||
self.screenBlockingWindow = window;
|
||||
}
|
||||
|
||||
#pragma mark - Events
|
||||
|
||||
- (void)screenLockDidChange:(NSNotification *)notification
|
||||
{
|
||||
[self ensureScreenProtection];
|
||||
}
|
||||
|
||||
- (void)registrationStateDidChange
|
||||
{
|
||||
OWSAssertIsOnMainThread();
|
||||
|
||||
DDLogInfo(@"registrationStateDidChange");
|
||||
|
||||
[self ensureScreenProtection];
|
||||
}
|
||||
|
||||
- (void)applicationDidBecomeActive:(NSNotification *)notification
|
||||
{
|
||||
self.appIsInactive = NO;
|
||||
}
|
||||
|
||||
- (void)applicationWillResignActive:(NSNotification *)notification
|
||||
{
|
||||
self.appIsInactive = YES;
|
||||
}
|
||||
|
||||
@end
|
||||
|
||||
NS_ASSUME_NONNULL_END
|
||||
Loading…
Reference in New Issue