NetNewsWire/Shared/Extensions/CacheCleaner.swift

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//
// CacheCleaner.swift
// NetNewsWire
//
// Created by Maurice Parker on 11/8/19.
// Copyright © 2019 Ranchero Software. All rights reserved.
//
import Foundation
import os.log
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import RSWeb
struct CacheCleaner {
static let log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "CacheCleaner")
static func purgeIfNecessary() {
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guard let flushDate = AppDefaults.shared.lastImageCacheFlushDate else {
AppDefaults.shared.lastImageCacheFlushDate = Date()
return
}
// If the image disk cache hasn't been flushed for 3 days and the network is available, delete it
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if flushDate.addingTimeInterval(3600 * 24 * 3) < Date() {
if let reachability = try? Reachability(hostname: "apple.com") {
if reachability.connection != .unavailable {
let tempDir = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first!
let faviconsFolderURL = tempDir.appendingPathComponent("Favicons")
let imagesFolderURL = tempDir.appendingPathComponent("Images")
let feedURLToIconURL = tempDir.appendingPathComponent("FeedURLToIconURLCache.plist")
let homePageToIconURL = tempDir.appendingPathComponent("HomePageToIconURLCache.plist")
let homePagesWithNoIconURL = tempDir.appendingPathComponent("HomePagesWithNoIconURLCache.plist")
for tempItem in [faviconsFolderURL, imagesFolderURL, feedURLToIconURL, homePageToIconURL, homePagesWithNoIconURL] {
do {
os_log(.info, log: self.log, "Removing cache file: %@", tempItem.absoluteString)
try FileManager.default.removeItem(at: tempItem)
} catch {
os_log(.error, log: self.log, "Could not delete cache file: %@", error.localizedDescription)
}
}
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AppDefaults.shared.lastImageCacheFlushDate = Date()
}
}
}
}
}