274 lines
12 KiB
Swift
274 lines
12 KiB
Swift
//
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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 failure(error:String)
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case unexpectedFailure(error:String)
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}
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@objc public let screenLockTimeoutDefault = 15 * kMinuteInterval
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@objc public let screenLockTimeouts = [
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1 * kMinuteInterval,
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5 * kMinuteInterval,
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15 * kMinuteInterval,
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30 * kMinuteInterval,
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1 * kHourInterval,
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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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owsFailDebug("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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@objc
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public 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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owsFailDebug("accessed screen lock state before storage is ready.")
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return 0
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}
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return self.dbConnection.double(forKey: OWSScreenLock_Key_ScreenLockTimeoutSeconds, inCollection: OWSScreenLock_Collection, defaultValue: screenLockTimeoutDefault)
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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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// This method should only be called:
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//
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// * On the main thread.
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//
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// Exactly one of these completions will be performed:
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//
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// * Asynchronously.
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// * On the main thread.
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@objc public func tryToUnlockScreenLock(success: @escaping (() -> Void),
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failure: @escaping ((Error) -> Void),
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unexpectedFailure: @escaping ((Error) -> Void),
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cancel: @escaping (() -> Void)) {
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AssertIsOnMainThread()
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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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Logger.error("local authentication failed with error: \(error)")
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failure(self.authenticationError(errorDescription: error))
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case .unexpectedFailure(let error):
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Logger.error("local authentication failed with unexpected error: \(error)")
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unexpectedFailure(self.authenticationError(errorDescription: error))
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case .success:
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Logger.verbose("local authentication succeeded.")
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success()
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case .cancel:
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Logger.verbose("local authentication cancelled.")
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cancel()
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}
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})
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}
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// This method should only be called:
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//
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// * On the main thread.
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//
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// completionParam will be performed:
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//
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// * Asynchronously.
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// * On the main thread.
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private func tryToVerifyLocalAuthentication(localizedReason: String,
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completion completionParam: @escaping ((OWSScreenLockOutcome) -> Void)) {
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AssertIsOnMainThread()
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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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// Ensure completion is always called on the main thread.
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let completion = { (outcome: OWSScreenLockOutcome) in
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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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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("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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owsFailDebug("local authentication unexpected success")
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completion(.failure(error:defaultErrorDescription))
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case .cancel, .failure, .unexpectedFailure:
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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("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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owsFailDebug("local authentication unexpected success")
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completion(.failure(error:defaultErrorDescription))
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case .cancel, .failure, .unexpectedFailure:
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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("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("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("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("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("local authentication cancelled.")
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return .cancel
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case .passcodeNotSet:
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Logger.error("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("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("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("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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owsFailDebug("context not valid.")
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return .unexpectedFailure(error:defaultErrorDescription)
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case .notInteractive:
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owsFailDebug("context not interactive.")
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return .unexpectedFailure(error:defaultErrorDescription)
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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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// Never recycle biometric auth.
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context.touchIDAuthenticationAllowableReuseDuration = TimeInterval(0)
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if #available(iOS 11.0, *) {
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assert(!context.interactionNotAllowed)
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}
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return context
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}
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}
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