Improves handling of authentication errors

Delta/Launch/LaunchViewController.swift

@@ -9,6 +9,8 @@
 import UIKit
 import Roxas
 
+import Harmony
+
 class LaunchViewController: RSTLaunchViewController
 {
     @IBOutlet private var gameViewContainerView: UIView!
@@ -75,11 +77,23 @@ extension LaunchViewController
     
     override func handleLaunchError(_ error: Error)
     {
-        let alertController = UIAlertController(title: NSLocalizedString("Unable to Launch Delta", comment: ""), message: error.localizedDescription, preferredStyle: .alert)
+        do
-        alertController.addAction(UIAlertAction(title: NSLocalizedString("Retry", comment: ""), style: .default, handler: { (action) in
+        {
+            throw error
+        }
+        catch is HarmonyError
+        {
+            // Ignore
             self.handleLaunchConditions()
-        }))
+        }
-        self.present(alertController, animated: true, completion: nil)
+        catch
+        {
+            let alertController = UIAlertController(title: NSLocalizedString("Unable to Launch Delta", comment: ""), message: error.localizedDescription, preferredStyle: .alert)
+            alertController.addAction(UIAlertAction(title: NSLocalizedString("Retry", comment: ""), style: .default, handler: { (action) in
+                self.handleLaunchConditions()
+            }))
+            self.present(alertController, animated: true, completion: nil)
+        }
     }
     
     override func finishLaunching()

Delta/Syncing/SyncManager.swift

@@ -124,11 +124,39 @@ extension SyncManager
                 _ = try result.get()
                 
                 self.coordinator = coordinator
-                
                 completionHandler(.success)
             }
+            catch let authError as AuthenticationError
+            {
+                // Authentication failed, but otherwise started successfully so still assign self.coordinator.
+                self.coordinator = coordinator
+                
+                switch authError
+                {
+                case .other(ServiceError.connectionFailed):
+                    // Authentication failed due to network connection, but otherwise started successfully so we ignore this error.
+                    completionHandler(.success)
+                    
+                default:
+                    // Another authentication error occured, so we'll deauthenticate ourselves.
+                    print("SyncManager.start auth error:", authError)
+                    
+                    self.deauthenticate() { (result) in
+                        switch result
+                        {
+                        case .success:
+                            completionHandler(.success)
+                            
+                        case .failure:
+                            // authError is more useful than result's error.
+                            completionHandler(.failure(authError))
+                        }
+                    }
+                }
+            }
             catch
             {
+                print("SyncManager.start error:", error)
                 completionHandler(.failure(error))
             }
         }