[AltStoreCore] Refactors core AltStore logic into AltStoreCore framework

AltStoreCore will contain all shared AltStore code between AltStore and any app extensions. Initially, it includes all AltStore model logic.

AltStoreCore/Extensions/JSONDecoder+Properties.swift

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+//
+//  JSONDecoder+Properties.swift
+//  Harmony
+//
+//  Created by Riley Testut on 10/3/18.
+//  Copyright © 2018 Riley Testut. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+public extension CodingUserInfoKey
+{
+    static let managedObjectContext = CodingUserInfoKey(rawValue: "managedObjectContext")!
+    static let sourceURL = CodingUserInfoKey(rawValue: "sourceURL")!
+}
+
+public final class JSONDecoder: Foundation.JSONDecoder
+{
+    @DecoderItem(key: .managedObjectContext)
+    public var managedObjectContext: NSManagedObjectContext?
+    
+    @DecoderItem(key: .sourceURL)
+    public var sourceURL: URL?
+}
+
+public extension Decoder
+{
+    var managedObjectContext: NSManagedObjectContext? { self.userInfo[.managedObjectContext] as? NSManagedObjectContext }
+    var sourceURL: URL? { self.userInfo[.sourceURL] as? URL }
+}
+
+@propertyWrapper
+public struct DecoderItem<Value>
+{
+    public let key: CodingUserInfoKey
+    
+    public var wrappedValue: Value? {
+        get { fatalError("only works on instance properties of classes") }
+        set { fatalError("only works on instance properties of classes") }
+    }
+    
+    public init(key: CodingUserInfoKey)
+    {
+        self.key = key
+    }
+    
+    public static subscript<OuterSelf: JSONDecoder>(
+        _enclosingInstance decoder: OuterSelf,
+        wrapped wrappedKeyPath: ReferenceWritableKeyPath<OuterSelf, Value?>,
+        storage storageKeyPath: ReferenceWritableKeyPath<OuterSelf, Self>
+    ) -> Value? {
+        get {
+            let wrapper = decoder[keyPath: storageKeyPath]
+
+            let value = decoder.userInfo[wrapper.key] as? Value
+            return value
+        }
+        set {
+            let wrapper = decoder[keyPath: storageKeyPath]
+            decoder.userInfo[wrapper.key] = newValue
+        }
+    }
+}

AltStoreCore/Extensions/UIApplication+AppExtension.swift

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+//
+//  UIApplication+AppExtension.swift
+//  DeltaCore
+//
+//  Created by Riley Testut on 6/14/18.
+//  Copyright © 2018 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+public extension UIApplication
+{
+    // Cannot normally use UIApplication.shared from extensions, so we get around this by calling value(forKey:).
+    class var alt_shared: UIApplication? {
+        return UIApplication.value(forKey: "sharedApplication") as? UIApplication
+    }
+}

AltStoreCore/Extensions/UIColor+Hex.swift

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+//
+//  UIColor+Hex.swift
+//  AltStore
+//
+//  Created by Riley Testut on 7/15/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+public extension UIColor
+{
+    // Borrowed from https://stackoverflow.com/a/26341062
+    var hexString: String {
+        let components = self.cgColor.components
+        let r: CGFloat = components?[0] ?? 0.0
+        let g: CGFloat = components?[1] ?? 0.0
+        let b: CGFloat = components?[2] ?? 0.0
+
+        let hexString = String.init(format: "%02lX%02lX%02lX", lroundf(Float(r * 255)), lroundf(Float(g * 255)), lroundf(Float(b * 255)))
+        return hexString
+    }
+    
+    // Borrowed from https://stackoverflow.com/a/33397427
+    convenience init?(hexString: String)
+    {
+        let hex = hexString.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
+        var int = UInt32()
+        Scanner(string: hex).scanHexInt32(&int)
+        let a, r, g, b: UInt32
+        switch hex.count {
+        case 3: // RGB (12-bit)
+            (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
+        case 6: // RGB (24-bit)
+            (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
+        case 8: // ARGB (32-bit)
+            (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
+        default:
+            return nil
+        }
+        self.init(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
+    }
+}

AltStoreCore/Extensions/UserDefaults+AltStore.swift

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+//
+//  UserDefaults+AltStore.swift
+//  AltStore
+//
+//  Created by Riley Testut on 6/4/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+import Roxas
+
+public extension UserDefaults
+{
+    @NSManaged var firstLaunch: Date?
+    
+    @NSManaged var preferredServerID: String?
+    
+    @NSManaged var isBackgroundRefreshEnabled: Bool
+    @NSManaged var isDebugModeEnabled: Bool
+    @NSManaged var presentedLaunchReminderNotification: Bool
+    
+    @NSManaged var legacySideloadedApps: [String]?
+    
+    @NSManaged var isLegacyDeactivationSupported: Bool
+    @NSManaged var activeAppLimitIncludesExtensions: Bool
+    
+    var activeAppsLimit: Int? {
+        get {
+            return self._activeAppsLimit?.intValue
+        }
+        set {
+            if let value = newValue
+            {
+                self._activeAppsLimit = NSNumber(value: value)
+            }
+            else
+            {
+                self._activeAppsLimit = nil
+            }
+        }
+    }
+    @NSManaged @objc(activeAppsLimit) private var _activeAppsLimit: NSNumber?
+    
+    func registerDefaults()
+    {
+        let ios13_5 = OperatingSystemVersion(majorVersion: 13, minorVersion: 5, patchVersion: 0)
+        let isLegacyDeactivationSupported = !ProcessInfo.processInfo.isOperatingSystemAtLeast(ios13_5)
+        let activeAppLimitIncludesExtensions = !ProcessInfo.processInfo.isOperatingSystemAtLeast(ios13_5)
+        
+        self.register(defaults: [
+            #keyPath(UserDefaults.isBackgroundRefreshEnabled): true,
+            #keyPath(UserDefaults.isLegacyDeactivationSupported): isLegacyDeactivationSupported,
+            #keyPath(UserDefaults.activeAppLimitIncludesExtensions): activeAppLimitIncludesExtensions
+        ])
+    }
+}