Improve error messaging when installing the Privileged Helper Tool (#103)

* Improve error messaging when installing the Privileged Helper Tool

* Squash those linter warnings

* Fix typo

Mist/Helpers/PropertyListUpdater.swift

@@ -10,7 +10,7 @@ import Foundation
 /// Helper struct to update a Property List key-pair value.
 struct PropertyListUpdater {
 
-    /// Edit a key-pair value in a Property List.
+    /// Update a key-pair value in a Property List.
     ///
     /// - Parameters:
     ///   - url:   The URL of the property list to be updated.

Mist/Model/FirmwareAlertType.swift

@@ -10,4 +10,5 @@ import SwiftUI
 enum FirmwareAlertType: String {
     case compatibility = "Compatiblity"
     case helperTool = "Helper Tool"
+    case error = "Error"
 }

Mist/Model/InstallerAlertType.swift

@@ -10,4 +10,5 @@ enum InstallerAlertType: String {
     case helperTool = "Helper Tool"
     case fullDiskAccess = "Full Disk Access"
     case cacheDirectory = "Cache Directory"
+    case error = "Error"
 }

Mist/Views/List/ListRowFirmware.swift

@@ -23,6 +23,7 @@ struct ListRowFirmware: View {
     @State private var showAlert: Bool = false
     @State private var showSavePanel: Bool = false
     @State private var downloading: Bool = false
+    @State private var error: Error?
     private let length: CGFloat = 48
     private let spacing: CGFloat = 5
     private let padding: CGFloat = 3
@@ -34,6 +35,14 @@ struct ListRowFirmware: View {
 
         return "This macOS Firmware download cannot be used to restore macOS on this \(architecture.description) Mac.\n\nAre you sure you want to continue?"
     }
+    private var errorMessage: String {
+
+        if let error: BlessError = error as? BlessError {
+            return error.description
+        }
+
+        return error?.localizedDescription ?? ""
+    }
 
     var body: some View {
         HStack {
@@ -68,10 +77,16 @@ struct ListRowFirmware: View {
             case .helperTool:
                 return Alert(
                     title: Text("Privileged Helper Tool not installed!"),
-                    message: Text("The Mist Privileged Helper Tool is required to perform Administrator tasks when downloading macOS Firmwares"),
+                    message: Text("The Mist Privileged Helper Tool is required to perform Administrator tasks when downloading macOS Firmwares."),
-                    primaryButton: .default(Text("Install...")) { installPrivilegedHelperTool() },
+                    primaryButton: .default(Text("Install...")) { Task { installPrivilegedHelperTool() } },
                     secondaryButton: .default(Text("Cancel"))
                 )
+            case .error:
+                return Alert(
+                    title: Text("An error has occured!"),
+                    message: Text(errorMessage),
+                    dismissButton: .default(Text("OK"))
+                )
             }
         }
         .onChange(of: showSavePanel) { boolean in
@@ -132,7 +147,13 @@ struct ListRowFirmware: View {
     }
 
     private func installPrivilegedHelperTool() {
-        try? PrivilegedHelperManager.shared.authorizeAndBless()
+        do {
+            try PrivilegedHelperManager.shared.authorizeAndBless()
+        } catch {
+            self.error = error
+            alertType = .error
+            showAlert = true
+        }
     }
 }
 

Mist/Views/List/ListRowInstaller.swift

@@ -48,6 +48,7 @@ struct ListRowInstaller: View {
     @State private var showOpenPanel: Bool = false
     @State private var exports: [InstallerExportType] = []
     @State private var volume: InstallerVolume?
+    @State private var error: Error?
     private let length: CGFloat = 48
     private let spacing: CGFloat = 5
     private let padding: CGFloat = 3
@@ -62,6 +63,14 @@ struct ListRowInstaller: View {
     private var cacheDirectoryMessage: String {
         "The cache directory has incorrect ownership and/or permissions, which will cause issues caching macOS Installers.\n\nRepair the cache directory ownership and/or permissions and try again."
     }
+    private var errorMessage: String {
+
+        if let error: BlessError = error as? BlessError {
+            return error.description
+        }
+
+        return error?.localizedDescription ?? ""
+    }
 
     var body: some View {
         HStack {
@@ -97,36 +106,7 @@ struct ListRowInstaller: View {
             .clipShape(Capsule())
         }
         .alert(isPresented: $showAlert) {
-            switch alertType {
+            alert(for: alertType)
-            case .compatibility:
-                return Alert(
-                    title: Text("macOS Installer not compatible!"),
-                    message: Text(compatibilityMessage),
-                    primaryButton: .default(Text("Cancel")),
-                    secondaryButton: .default(Text("Continue")) { Task { validate() } }
-                )
-            case .helperTool:
-                return Alert(
-                    title: Text("Privileged Helper Tool not installed!"),
-                    message: Text("The Mist Privileged Helper Tool is required to perform Administrator tasks when creating macOS Installers."),
-                    primaryButton: .default(Text("Install...")) { installPrivilegedHelperTool() },
-                    secondaryButton: .default(Text("Cancel"))
-                )
-            case .fullDiskAccess:
-                return Alert(
-                    title: Text("Full Disk Access required!"),
-                    message: Text("Mist requires Full Disk Access to perform Administrator tasks when creating macOS Installers."),
-                    primaryButton: .default(Text("Allow...")) { openFullDiskAccessPreferences() },
-                    secondaryButton: .default(Text("Cancel"))
-                )
-            case .cacheDirectory:
-                return Alert(
-                    title: Text("Cache directory settings incorrect!"),
-                    message: Text(cacheDirectoryMessage),
-                    primaryButton: .default(Text("Repair...")) { Task { try await repairCacheDirectoryOwnershipAndPermissions() } },
-                    secondaryButton: .default(Text("Cancel"))
-                )
-            }
         }
         .onChange(of: showOpenPanel) { boolean in
 
@@ -309,7 +289,13 @@ struct ListRowInstaller: View {
     }
 
     private func installPrivilegedHelperTool() {
-        try? PrivilegedHelperManager.shared.authorizeAndBless()
+        do {
+            try PrivilegedHelperManager.shared.authorizeAndBless()
+        } catch {
+            self.error = error
+            alertType = .error
+            showAlert = true
+        }
     }
 
     private func openFullDiskAccessPreferences() {
@@ -326,6 +312,45 @@ struct ListRowInstaller: View {
         let ownerAccountName: String = NSUserName()
         try await FileAttributesUpdater.update(url: url, ownerAccountName: ownerAccountName)
     }
+
+    private func alert(for alertType: InstallerAlertType) -> Alert {
+        switch alertType {
+        case .compatibility:
+            return Alert(
+                title: Text("macOS Installer not compatible!"),
+                message: Text(compatibilityMessage),
+                primaryButton: .default(Text("Cancel")),
+                secondaryButton: .default(Text("Continue")) { Task { validate() } }
+            )
+        case .helperTool:
+            return Alert(
+                title: Text("Privileged Helper Tool not installed!"),
+                message: Text("The Mist Privileged Helper Tool is required to perform Administrator tasks when creating macOS Installers."),
+                primaryButton: .default(Text("Install...")) { Task { installPrivilegedHelperTool() } },
+                secondaryButton: .default(Text("Cancel"))
+            )
+        case .fullDiskAccess:
+            return Alert(
+                title: Text("Full Disk Access required!"),
+                message: Text("Mist requires Full Disk Access to perform Administrator tasks when creating macOS Installers."),
+                primaryButton: .default(Text("Allow...")) { openFullDiskAccessPreferences() },
+                secondaryButton: .default(Text("Cancel"))
+            )
+        case .cacheDirectory:
+            return Alert(
+                title: Text("Cache directory settings incorrect!"),
+                message: Text(cacheDirectoryMessage),
+                primaryButton: .default(Text("Repair...")) { Task { try await repairCacheDirectoryOwnershipAndPermissions() } },
+                secondaryButton: .default(Text("Cancel"))
+            )
+        case .error:
+            return Alert(
+                title: Text("An error has occured!"),
+                message: Text(errorMessage),
+                dismissButton: .default(Text("OK"))
+            )
+        }
+    }
 }
 
 struct ListRowInstaller_Previews: PreviewProvider {