57 lines
2.1 KiB
Swift
57 lines
2.1 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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final class DataProtectionHelper {
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/// Detects after reboot, before unlocked state. Does this by trying to write a file to the filesystem (to the Caches directory) and read it back.
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/// - Parameter appGroupIdentifier: App-group identifier to be used when deciding where it'll try to write the file.
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/// - Returns: true if the state detected
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static func isDeviceInRebootedAndLockedState(appGroupIdentifier: String? = nil) -> Bool {
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let dummyString = String.vc_unique
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guard let dummyData = dummyString.data(using: .utf8) else {
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return true
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}
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do {
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var url: URL
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if let identifier = appGroupIdentifier,
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let containerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: identifier) {
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url = containerURL
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} else {
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url = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0]
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}
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// add a unique filename
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url = url.appendingPathComponent(String.vc_unique)
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try dummyData.write(to: url, options: .completeFileProtectionUntilFirstUserAuthentication)
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let readData = try Data(contentsOf: url)
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let readString = String(data: readData, encoding: .utf8)
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try FileManager.default.removeItem(at: url)
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if readString != dummyString {
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return true
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}
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} catch {
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return true
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}
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return false
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}
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}
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