48 lines
1.7 KiB
Swift
48 lines
1.7 KiB
Swift
/*
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Copyright 2020-2024 New Vector Ltd.
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SPDX-License-Identifier: AGPL-3.0-only
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Please see LICENSE in the repository root for full details.
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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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