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// SPDX-License-Identifier: MIT
// Copyright © 2018-2019 WireGuard LLC. All Rights Reserved.
import UIKit
class LogViewController: UIViewController {
let textView: UITextView = {
let textView = UITextView()
textView.isEditable = false
textView.isSelectable = true
textView.font = UIFont.preferredFont(forTextStyle: UIFont.TextStyle.body)
textView.adjustsFontForContentSizeCategory = true
return textView
}()
let busyIndicator: UIActivityIndicatorView = {
let busyIndicator = UIActivityIndicatorView(style: .gray)
busyIndicator.hidesWhenStopped = true
return busyIndicator
}()
let paragraphStyle: NSParagraphStyle = {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.setParagraphStyle(NSParagraphStyle.default)
paragraphStyle.lineHeightMultiple = 1.2
return paragraphStyle
}()
var isNextLineHighlighted = false
var logViewHelper: LogViewHelper?
var isFetchingLogEntries = false
private var updateLogEntriesTimer: Timer?
override func loadView() {
view = UIView()
view.backgroundColor = .white
view.addSubview(textView)
textView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
textView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
textView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
textView.topAnchor.constraint(equalTo: view.topAnchor),
textView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
])
view.addSubview(busyIndicator)
busyIndicator.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
busyIndicator.centerXAnchor.constraint(equalTo: view.centerXAnchor),
busyIndicator.centerYAnchor.constraint(equalTo: view.centerYAnchor)
])
busyIndicator.startAnimating()
logViewHelper = LogViewHelper(logFilePath: FileManager.logFileURL?.path)
startUpdatingLogEntries()
}
override func viewDidLoad() {
title = tr("logViewTitle")
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .save, target: self, action: #selector(saveTapped(sender:)))
}
func updateLogEntries() {
guard !isFetchingLogEntries else { return }
isFetchingLogEntries = true
logViewHelper?.fetchLogEntriesSinceLastFetch { [weak self] fetchedLogEntries in
guard let self = self else { return }
defer {
self.isFetchingLogEntries = false
}
if self.busyIndicator.isAnimating {
self.busyIndicator.stopAnimating()
}
guard !fetchedLogEntries.isEmpty else { return }
let isScrolledToEnd = self.textView.contentSize.height - self.textView.bounds.height - self.textView.contentOffset.y < 1
let richText = NSMutableAttributedString()
let bodyFont = UIFont.preferredFont(forTextStyle: UIFont.TextStyle.body)
let captionFont = UIFont.preferredFont(forTextStyle: UIFont.TextStyle.caption1)
let lightGrayColor = UIColor(white: 0.88, alpha: 1.0)
for logEntry in fetchedLogEntries {
let bgColor = self.isNextLineHighlighted ? lightGrayColor : UIColor.white
let timestampText = NSAttributedString(string: logEntry.timestamp + "\n", attributes: [.font: captionFont, .backgroundColor: bgColor, .paragraphStyle: self.paragraphStyle])
let messageText = NSAttributedString(string: logEntry.message + "\n", attributes: [.font: bodyFont, .backgroundColor: bgColor, .paragraphStyle: self.paragraphStyle])
richText.append(timestampText)
richText.append(messageText)
self.isNextLineHighlighted.toggle()
}
self.textView.textStorage.append(richText)
if isScrolledToEnd {
let endOfCurrentText = NSRange(location: (self.textView.text as NSString).length, length: 0)
self.textView.scrollRangeToVisible(endOfCurrentText)
}
}
}
func startUpdatingLogEntries() {
updateLogEntries()
updateLogEntriesTimer?.invalidate()
let timer = Timer(timeInterval: 1 /* second */, repeats: true) { [weak self] _ in
self?.updateLogEntries()
}
updateLogEntriesTimer = timer
RunLoop.main.add(timer, forMode: .common)
}
@objc func saveTapped(sender: AnyObject) {
guard let destinationDir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
let dateFormatter = ISO8601DateFormatter()
dateFormatter.formatOptions = [.withFullDate, .withTime, .withTimeZone] // Avoid ':' in the filename
let timeStampString = dateFormatter.string(from: Date())
let destinationURL = destinationDir.appendingPathComponent("wireguard-log-\(timeStampString).txt")
DispatchQueue.global(qos: .userInitiated).async {
if FileManager.default.fileExists(atPath: destinationURL.path) {
let isDeleted = FileManager.deleteFile(at: destinationURL)
if !isDeleted {
ErrorPresenter.showErrorAlert(title: tr("alertUnableToRemovePreviousLogTitle"), message: tr("alertUnableToRemovePreviousLogMessage"), from: self)
return
}
}
let isWritten = Logger.global?.writeLog(to: destinationURL.path) ?? false
DispatchQueue.main.async {
guard isWritten else {
ErrorPresenter.showErrorAlert(title: tr("alertUnableToWriteLogTitle"), message: tr("alertUnableToWriteLogMessage"), from: self)
return
}
let activityVC = UIActivityViewController(activityItems: [destinationURL], applicationActivities: nil)
if let sender = sender as? UIBarButtonItem {
activityVC.popoverPresentationController?.barButtonItem = sender
}
activityVC.completionWithItemsHandler = { _, _, _, _ in
// Remove the exported log file after the activity has completed
_ = FileManager.deleteFile(at: destinationURL)
}
self.present(activityVC, animated: true)
}
}
}
}
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