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Merge pull request #101 from tonystone/fixed-protected-data
Add protected data monitoring for fixed FileWriter strategy on iOS
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Sources/TraceLog/Writers & Formatters/FileStrategy+Fixed.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| /// | ||
| /// FileStrategy+Fixed.swift | ||
| /// | ||
| /// Copyright 2019 Tony Stone | ||
| /// | ||
| /// 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. | ||
| /// | ||
| /// Created by Tony Stone on 1/31/19. | ||
| /// | ||
| import Foundation | ||
|
|
||
| @available(iOSApplicationExtension, unavailable) | ||
| internal class FileStrategyFixed: FileStrategyManager { | ||
|
|
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| let url: URL | ||
|
|
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| private var stream: FileOutputStream | ||
| private var available: Bool | ||
|
|
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| init(directory: URL, fileName: String) throws { | ||
|
|
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| self.url = directory.appendingPathComponent(fileName) | ||
| self.available = isLogAvailable() | ||
| self.stream = try FileOutputStream(url: url, options: [.create]) | ||
|
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| #if os(iOS) && !targetEnvironment(simulator) | ||
| /// Note: You can create empty files with file protection in any state. You just cant write or read from them. | ||
| /// We can safely create the file and set it's protection level even if not available. | ||
| /// | ||
| try FileManager.default.setAttributes([.protectionKey : FileProtectionType.completeUntilFirstUserAuthentication], ofItemAtPath: url.path) | ||
|
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| if !available { | ||
| NotificationCenter.default.addObserver(forName: UIApplication.protectedDataDidBecomeAvailableNotification, object: nil, queue: nil) { (_) in | ||
| if !self.available { | ||
| self.available = true | ||
| } | ||
| } | ||
| } | ||
| #endif | ||
| } | ||
| deinit { | ||
| self.stream.close() | ||
| } | ||
|
|
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| func write(_ bytes: [UInt8]) -> Result<Int, FailureReason> { | ||
|
|
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| guard self.available | ||
| else { return .failure(.unavailable) } | ||
|
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| return stream.write(bytes).mapError({ self.failureReason($0) }) | ||
| } | ||
| } | ||
|
|
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| #if os(iOS) && !targetEnvironment(simulator) | ||
| import UIKit | ||
|
|
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| @available(iOSApplicationExtension, unavailable) | ||
| func isLogAvailable() -> Bool { | ||
| if !Thread.isMainThread { | ||
| return DispatchQueue.main.sync { | ||
| return UIApplication.shared.isProtectedDataAvailable | ||
| } | ||
| } | ||
| return UIApplication.shared.isProtectedDataAvailable | ||
| } | ||
| #else | ||
|
|
||
| func isLogAvailable() -> Bool { | ||
| return true | ||
| } | ||
| #endif |
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