[AltStore] Revises authentication flow with better UI

AltStore/Authentication/SelectTeamViewController.swift

@@ -0,0 +1,150 @@
+//
+//  SelectTeamViewController.swift
+//  AltStore
+//
+//  Created by Riley Testut on 6/5/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+import AltSign
+import Roxas
+
+class SelectTeamViewController: UITableViewController
+{
+    var selectionHandler: ((ALTTeam?) -> Void)?
+    
+    var teams: [ALTTeam] {
+        get {
+            return self.dataSource.items
+        }
+        set {
+            self.dataSource.items = newValue
+        }
+    }
+    
+    private var selectedTeam: ALTTeam? {
+        didSet {
+            self.update()
+        }
+    }
+    
+    private lazy var dataSource = self.makeDataSource()
+    
+    override func viewDidLoad()
+    {
+        super.viewDidLoad()
+        
+        self.tableView.dataSource = self.dataSource
+        
+        self.update()
+    }
+    
+    override func viewWillDisappear(_ animated: Bool)
+    {
+        super.viewDidDisappear(animated)
+        
+        self.navigationItem.rightBarButtonItem?.isIndicatingActivity = false
+    }
+}
+
+private extension SelectTeamViewController
+{
+    func makeDataSource() -> RSTArrayTableViewDataSource<ALTTeam>
+    {
+        let dataSource = RSTArrayTableViewDataSource<ALTTeam>(items: [])
+        dataSource.proxy = self
+        dataSource.cellConfigurationHandler = { [weak self] (cell, team, indexPath) in
+            cell.textLabel?.text = team.name
+            
+            switch team.type
+            {
+            case .unknown: cell.detailTextLabel?.text = NSLocalizedString("Unknown", comment: "")
+            case .free: cell.detailTextLabel?.text = NSLocalizedString("Free Developer Account", comment: "")
+            case .individual: cell.detailTextLabel?.text = NSLocalizedString("Individual", comment: "")
+            case .organization: cell.detailTextLabel?.text = NSLocalizedString("Organization", comment: "")
+            @unknown default: cell.detailTextLabel?.text = nil
+            }
+            
+            cell.accessoryType = (self?.selectedTeam == team) ? .checkmark : .none
+        }
+        
+        let placeholderView = RSTPlaceholderView(frame: .zero)
+        placeholderView.textLabel.text = NSLocalizedString("No Teams", comment: "")
+        placeholderView.detailTextLabel.text = NSLocalizedString("You are not a member of any development teams.", comment: "")
+        dataSource.placeholderView = placeholderView
+        
+        return dataSource
+    }
+    
+    func update()
+    {
+        self.navigationItem.rightBarButtonItem?.isEnabled = (self.selectedTeam != nil)
+        
+        if self.isViewLoaded
+        {
+            self.tableView.reloadData()
+        }
+    }
+    
+    func fetchCertificates(for team: ALTTeam, completionHandler: @escaping (Result<[ALTCertificate], Error>) -> Void)
+    {
+        ALTAppleAPI.shared.fetchCertificates(for: team) { (certificate, error) in
+            let result = Result(certificate, error)
+            completionHandler(result)
+        }
+    }
+}
+
+private extension SelectTeamViewController
+{
+    @IBAction func chooseTeam(_ sender: UIBarButtonItem)
+    {
+        guard let team = self.selectedTeam else { return }
+        
+        func choose()
+        {
+            sender.isIndicatingActivity = true
+            
+            self.selectionHandler?(team)
+        }
+        
+        if team.type == .organization
+        {
+            let localizedActionTitle = String(format: NSLocalizedString("Use %@?", comment: ""), team.name)
+            
+            let alertController = UIAlertController(title: NSLocalizedString("Are you sure you want to use an Organization team?", comment: ""),
+                                                    message: NSLocalizedString("Doing so may affect other members of this team.", comment: ""), preferredStyle: .actionSheet)
+            alertController.addAction(UIAlertAction(title: localizedActionTitle, style: .destructive, handler: { (action) in
+                choose()
+            }))
+            alertController.addAction(.cancel)
+            
+            self.present(alertController, animated: true, completion: nil)
+        }
+        else
+        {
+            choose()
+        }
+    }
+    
+    @IBAction func cancel()
+    {
+        self.selectionHandler?(nil)
+    }
+}
+
+extension SelectTeamViewController
+{
+    override func tableView(_ tableView: UITableView, titleForFooterInSection section: Int) -> String?
+    {
+        return NSLocalizedString("Select the team you would like to use to install apps.", comment: "")
+    }
+    
+    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
+    {
+        let team = self.dataSource.item(at: indexPath)
+        self.selectedTeam = team
+    }
+}