Shows source errors in SourcesViewController

AltStore/Extensions/NSError+AltStore.swift

@@ -0,0 +1,60 @@
+//
+//  NSError+AltStore.swift
+//  AltStore
+//
+//  Created by Riley Testut on 3/11/20.
+//  Copyright © 2020 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+extension NSError
+{
+    @objc(alt_localizedFailure)
+    var localizedFailure: String? {
+        let localizedFailure = (self.userInfo[NSLocalizedFailureErrorKey] as? String) ?? (NSError.userInfoValueProvider(forDomain: self.domain)?(self, NSLocalizedFailureErrorKey) as? String)
+        return localizedFailure
+    }
+    
+    func withLocalizedFailure(_ failure: String) -> NSError
+    {
+        var userInfo = self.userInfo
+        userInfo[NSLocalizedFailureErrorKey] = failure
+        userInfo[NSLocalizedDescriptionKey] = self.localizedDescription
+        userInfo[NSLocalizedFailureReasonErrorKey] = self.localizedFailureReason
+        userInfo[NSLocalizedRecoverySuggestionErrorKey] = self.localizedRecoverySuggestion
+        
+        let error = NSError(domain: self.domain, code: self.code, userInfo: userInfo)
+        return error
+    }
+    
+    func sanitizedForCoreData() -> NSError
+    {
+        var userInfo = self.userInfo
+        userInfo[NSLocalizedFailureErrorKey] = self.localizedFailure
+        userInfo[NSLocalizedDescriptionKey] = self.localizedDescription
+        userInfo[NSLocalizedFailureReasonErrorKey] = self.localizedFailureReason
+        userInfo[NSLocalizedRecoverySuggestionErrorKey] = self.localizedRecoverySuggestion
+        
+        // Remove non-ObjC-compliant userInfo values.
+        userInfo["NSCodingPath"] = nil
+        
+        let error = NSError(domain: self.domain, code: self.code, userInfo: userInfo)
+        return error
+    }
+}
+
+protocol ALTLocalizedError: LocalizedError, CustomNSError
+{
+    var errorFailure: String? { get }
+}
+
+extension ALTLocalizedError
+{
+    var errorUserInfo: [String : Any] {
+        let userInfo = [NSLocalizedDescriptionKey: self.errorDescription,
+                        NSLocalizedFailureReasonErrorKey: self.failureReason,
+                        NSLocalizedFailureErrorKey: self.errorFailure].compactMapValues { $0 }
+        return userInfo
+    }
+}