[AltServer] Uses GrandSlam Authentication

Uses Mail.app plug-in to retrieve the computer’s anisette data, which is necessary for GSA.

AltServer/AnisetteDataManager.swift

@@ -0,0 +1,69 @@
+//
+//  AnisetteDataManager.swift
+//  AltServer
+//
+//  Created by Riley Testut on 11/16/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import Foundation
+import AltKit
+
+class AnisetteDataManager: NSObject
+{
+    static let shared = AnisetteDataManager()
+    
+    private var anisetteDataCompletionHandlers: [String: (Result<ALTAnisetteData, Error>) -> Void] = [:]
+    private var anisetteDataTimers: [String: Timer] = [:]
+    
+    private override init()
+    {
+        super.init()
+        
+        DistributedNotificationCenter.default().addObserver(self, selector: #selector(AnisetteDataManager.handleAnisetteDataResponse(_:)), name: Notification.Name("com.rileytestut.AltServer.AnisetteDataResponse"), object: nil)
+    }
+    
+    func requestAnisetteData(_ completion: @escaping (Result<ALTAnisetteData, Error>) -> Void)
+    {
+        let requestUUID = UUID().uuidString
+        self.anisetteDataCompletionHandlers[requestUUID] = completion
+        
+        let timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: false) { (timer) in
+            self.finishRequest(forUUID: requestUUID, result: .failure(ALTServerError(.pluginNotFound)))
+        }
+        self.anisetteDataTimers[requestUUID] = timer
+        
+        DistributedNotificationCenter.default().postNotificationName(Notification.Name("com.rileytestut.AltServer.FetchAnisetteData"), object: nil, userInfo: ["requestUUID": requestUUID], options: .deliverImmediately)
+    }
+}
+
+private extension AnisetteDataManager
+{
+    @objc func handleAnisetteDataResponse(_ notification: Notification)
+    {
+        guard let userInfo = notification.userInfo, let requestUUID = userInfo["requestUUID"] as? String else { return }
+                
+        if
+            let archivedAnisetteData = userInfo["anisetteData"] as? Data,
+            let anisetteData = try? NSKeyedUnarchiver.unarchivedObject(ofClass: ALTAnisetteData.self, from: archivedAnisetteData)
+        {
+            self.finishRequest(forUUID: requestUUID, result: .success(anisetteData))
+        }
+        else
+        {
+            self.finishRequest(forUUID: requestUUID, result: .failure(ALTServerError(.invalidAnisetteData)))
+        }
+    }
+    
+    func finishRequest(forUUID requestUUID: String, result: Result<ALTAnisetteData, Error>)
+    {
+        let completionHandler = self.anisetteDataCompletionHandlers[requestUUID]
+        self.anisetteDataCompletionHandlers[requestUUID] = nil
+        
+        let timer = self.anisetteDataTimers[requestUUID]
+        self.anisetteDataTimers[requestUUID] = nil
+        
+        timer?.invalidate()
+        completionHandler?(result)
+    }
+}