VPN v2

main/unused/AppInfoType.swift

@@ -0,0 +1,129 @@
+import Foundation
+import UIKit
+
+private let fm = FileManager.default
+private let documentsDir = try! fm.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+private let bundleInfoDir = documentsDir.appendingPathComponent("bundleInfo", isDirectory:true)
+
+
+struct AppInfoType : Decodable {
+	var id: String
+	var name: String?
+	var seller: String?
+	var imageURL: URL?
+	private var remoteImgURL: String?
+	private var cache: Bool?
+	private let localJSON: URL
+	private let localImgURL: URL
+	
+	static func initWorkingDir() {
+		try? fm.createDirectory(at: bundleInfoDir, withIntermediateDirectories: true, attributes: nil)
+//		print("init dir: \(bundleInfoDir)")
+	}
+	
+	init(id: String) {
+		self.id = id
+		if id == "" {
+			name = "–?–"
+			cache = true
+			localJSON = URL(fileURLWithPath: "")
+			localImgURL = localJSON
+		} else {
+			localJSON = bundleInfoDir.appendingPathComponent("\(id).json")
+			localImgURL = bundleInfoDir.appendingPathComponent("\(id).img")
+			reload()
+		}
+	}
+	
+	mutating func reload() {
+		if fm.fileExists(atPath: localImgURL.path) {
+			imageURL = localImgURL
+		}
+		guard name == nil, seller == nil,
+			fm.fileExists(atPath: localJSON.path),
+			let attr = try? fm.attributesOfItem(atPath: localJSON.path),
+			attr[FileAttributeKey.size] as! UInt64 > 0 else
+		{
+			// process json only if attributes not set yet,
+			// OR json doesn't exist, OR json is empty
+			return
+		}
+		(name, seller, remoteImgURL) = parseJSON(localJSON)
+		
+		if remoteImgURL == nil || imageURL != nil {
+			cache = true
+		}
+	}
+	
+	func getImage() -> UIImage? {
+		if let img = imageURL, let data = try? Data(contentsOf: img) {
+			return UIImage(data: data, scale: 2.0)
+		} else if id.hasPrefix("com.apple.") {
+			return appIconApple
+		} else {
+			return appIconUnknown
+		}
+	}
+	
+	private func parseJSON(_ location: URL) -> (name: String?, seller: String?, image: String?) {
+		do {
+			let data = try Data.init(contentsOf: location)
+			if
+				let json = try JSONSerialization.jsonObject(with: data, options: .fragmentsAllowed) as? [String: Any],
+				let resAll = json["results"] as? [Any],
+				let res = resAll.first as? [String: Any]
+			{
+				let name = res["trackName"] as? String // trackCensoredName
+				let seller = res["sellerName"] as? String // artistName
+				let image = res["artworkUrl60"] as? String // artworkUrl100
+				return (name, seller, image)
+			} else if id.hasPrefix("com.apple.") {
+				return (String(id.dropFirst(10)), "Apple Inc.", nil)
+			}
+		} catch {}
+		return (nil, nil, nil)
+	}
+	
+	mutating func updateIfNeeded(_ updateClosure: () -> Void) {
+		guard cache == nil,
+			let safeId = id.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) else {
+			return
+		}
+		cache = false // meaning: hasn't downloaded yet, but is about to do
+//		print("downloading \(id)")
+		_ = downloadURL("https://itunes.apple.com/lookup?bundleId=\(safeId)", toFile: localJSON).flatMap{
+//			print("downloading \(id) done.")
+			reload()
+			updateClosure()
+			return downloadURL(remoteImgURL, toFile: localImgURL)
+		}.map{
+//			print("downloading \(id) image done.")
+			reload()
+			updateClosure()
+		}
+	}
+	
+	enum NetworkError: Error {
+		case url
+    }
+	
+	private func downloadURL(_ urlStr: String?, toFile: URL) -> Result<Void, Error> {
+		guard let urlStr = urlStr, let url = URL(string: urlStr) else {
+			return .failure(NetworkError.url)
+		}
+		var result: Result<Void, Error>!
+		let semaphore = DispatchSemaphore(value: 0)
+		URLSession.shared.downloadTask(with: url) { location, response, error in
+			if let loc = location {
+				try? fm.removeItem(at: toFile)
+				try? fm.moveItem(at: loc, to: toFile)
+				result = .success(())
+			} else {
+				result = .failure(error!)
+			}
+			semaphore.signal()
+		}.resume()
+		_ = semaphore.wait(wallTimeout: .distantFuture)
+		return result
+	}
+}