79 lines
3.1 KiB
Swift
79 lines
3.1 KiB
Swift
//
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// Copyright (c) 2018 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import LocalAuthentication
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public typealias BiometricsAuthHandler = (Bool, Error?) -> Void
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/// Service that provide access to authentication via biometric
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public final class BiometricsService {
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private lazy var laContext = LAContext()
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/// Returns true if user can authenticate via faceID
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public var isFaceIdSupported: Bool {
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if #available(iOS 11.0, *) {
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return canAuthenticateWithBiometrics && laContext.biometryType == .faceID
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} else {
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return false
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}
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}
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/// Returns current domain state
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public var evaluatedPolicyDomainState: Data? {
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// We need to call canEvaluatePolicy function for evaluatedPolicyDomainState to be updated
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_ = canAuthenticateWithBiometrics
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return laContext.evaluatedPolicyDomainState
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}
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/// Indicates is it possible to authenticate on this device via touch id
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public var canAuthenticateWithBiometrics: Bool {
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return laContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil)
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}
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/**
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Initiates system biometrics authentication process
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- parameters:
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- description: prompt on the system alert
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- fallback: alternative action button title on system alert
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- cancel: cancel button title on the system alert
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- authHandler: callback, with parameter, indicates if user authenticate successfuly
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*/
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public func authenticateWithBiometrics(with description: String,
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fallback fallbackTitle: String?,
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cancel cancelTitle: String?,
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authHandler: @escaping BiometricsAuthHandler) {
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if #available(iOS 10.0, *) {
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laContext.localizedCancelTitle = cancelTitle
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}
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laContext.localizedFallbackTitle = fallbackTitle
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laContext.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: description) { success, error in
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authHandler(success, error)
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}
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}
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public init() {}
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}
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