Add an error sheet to failed QuickRestore bootstrap

Signal/Registration/UserInterface/RegistrationQuickRestoreQRCodeViewController.swift

@@ -61,8 +61,30 @@ class RegistrationQuickRestoreQRCodeViewController:
                 let message: RegistrationProvisioningMessage = try await provisioningSocketManager.waitForMessage()
                 presenter?.didReceiveRegistrationMessage(message)
             } catch {
-                // TODO: [Backups]: Prompt the user with the error
-                Logger.error("Encountered error waiting for qick restore message")
+                let title = OWSLocalizedString(
+                    "REGISTRATION_SCAN_QR_CODE_FAILED_TITLE",
+                    comment: "Title of error notifying restore failed."
+                )
+                let body = OWSLocalizedString(
+                    "REGISTRATION_SCAN_QR_CODE_FAILED_BODY",
+                    comment: "Body of error notifying restore failed."
+                )
+                let sheet = HeroSheetViewController(
+                    hero: .circleIcon(
+                                icon: UIImage(named: "alert")!,
+                                iconSize: 36,
+                                tintColor: UIColor.Signal.label,
+                                backgroundColor: UIColor.Signal.background
+                            ),
+                    title: title,
+                    body: body,
+                    primaryButton: .init(title: CommonStrings.okayButton, action: { [weak self] _ in
+                        self?.provisioningSocketManager.reset()
+                        self?.presentedViewController?.dismiss(animated: true)
+                    })
+                )
+                sheet.modalPresentationStyle = .formSheet
+                present(sheet, animated: true)
             }
         }
     }

Signal/translations/en.lproj/Localizable.strings

@@ -6955,6 +6955,12 @@
 /* No comment provided by engineer. */
 "REGISTRATION_RESTRICTED_MESSAGE" = "You need to register before you can send a message.";
 
+/* Body of error notifying restore failed. */
+"REGISTRATION_SCAN_QR_CODE_FAILED_BODY" = "Failed to restore from old device. Try again.";
+
+/* Title of error notifying restore failed. */
+"REGISTRATION_SCAN_QR_CODE_FAILED_TITLE" = "Restore failed";
+
 /* Title for screen containing QR code that users scan with their old phone when they want to transfer/restore their message history to a new device. */
 "REGISTRATION_SCAN_QR_CODE_TITLE" = "Scan this code with your old phone";
 

SignalUI/Appearance/Theme+Icons.swift

@@ -134,6 +134,8 @@ public enum ThemeIcon: UInt {
     case composeFindByPhoneNumberLarge
     case composeInviteLarge
 
+    case errorCircle
+
     case check16
     case compose16
     case error16
@@ -462,6 +464,10 @@ public extension Theme {
         case .composeInviteLarge:
             return "invite-resizable"
 
+            // Error icon
+        case .errorCircle:
+            return "error-circle"
+
             // Compact 16 dp icons
         case .check16:
             return "check-compact"