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UserAuthenticator.swift
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UserAuthenticator.swift
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//
// UserAuthenticator.swift
// DuckDuckGo
//
// Copyright © 2024 DuckDuckGo. All rights reserved.
//
// 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 Common
import Foundation
import LocalAuthentication
import Core
class UserAuthenticator {
enum AuthError: Equatable {
case noAuthAvailable
case failedToAuthenticate
}
enum AuthenticationState {
case loggedIn, loggedOut, notAvailable
}
public struct Notifications {
public static let invalidateContext = Notification.Name("com.duckduckgo.app.UserAuthenticator.invalidateContext")
}
private var context = LAContext()
private var reason: String
@Published private(set) var state = AuthenticationState.loggedOut
init(reason: String) {
self.reason = reason
}
func logOut() {
state = .loggedOut
}
func canAuthenticate() -> Bool {
var error: NSError?
let canAuthenticate = LAContext().canEvaluatePolicy(.deviceOwnerAuthentication, error: &error)
return canAuthenticate
}
func authenticate(completion: ((AuthError?) -> Void)? = nil) {
if state == .loggedIn {
completion?(nil)
return
}
context = LAContext()
context.localizedCancelTitle = UserText.autofillLoginListAuthenticationCancelButton
context.localizedReason = reason
if canAuthenticate() {
let reason = reason
context.evaluatePolicy(.deviceOwnerAuthentication, localizedReason: reason ) { success, error in
DispatchQueue.main.async {
if success {
self.state = .loggedIn
completion?(nil)
} else {
os_log("Failed to authenticate: %s", log: .generalLog, type: .debug, error?.localizedDescription ?? "nil error")
completion?(.failedToAuthenticate)
}
}
}
} else {
state = .notAvailable
completion?(.noAuthAvailable)
}
}
func invalidateContext() {
context.invalidate()
}
}