Firebase Auth & Storage Error Handling for iOS

FirebaseAuthExtention.swift

// MARK: - Firebase Auth
extension Auth {
    //Handle Firebase Auth Errors
    static func handleFirebaseAuthErrorWith(errorCode: AuthErrorCode) -> [String] {
        switch errorCode {
        case .emailAlreadyInUse:
            let title = "User Exist"
            let message = "The email address provided already exist. Please login using your credentials."
            return [title, message]
        case .invalidEmail:
            let title = "Invalid Email"
            let message = "The email address provided is invalid."
            return [title, message]
        case .userDisabled:
            let title = "User Disabled"
            let message = "Your account has been disabled."
            return [title, message]
        case .wrongPassword:
            let title = "Wrong Password"
            let message = "Please check password and try again."
            return [title, message]
        case .userNotFound:
            let title = "User Not Found"
            let message = "There is no user registered with the details you have provided. "
            return [title, message]
        case .weakPassword:
            let title = "Weak Password"
            let message = "Please use a more secure password with at least 6 alphanumeric characters."
            return [title, message]
        case .requiresRecentLogin:
            let title = "Recent Login Required"
            let message = "You need to login again in order to update sensitive account details."
            return [title, message]
        default:
            let title = "Error"
            let message = "\(errorCode)"
            return [title, message]
        }
    }  
}

FirebaseStorageExtention.swift

// MARK: - Firebase Storage
extension Storage {
    //Handle Firebase Storage Errors
    static func handleFirebaseStorageErrorWith(errorCode: StorageErrorCode) -> [String] {
        switch errorCode {
        case .unknown:
            let title = "Uknown Error"
            let message = "An unknown error occurred."
            return [title, message]
        case .objectNotFound:
            let title = "Object Not Found"
            let message = "No object exists at the desired reference."
            return [title, message]
        case .bucketNotFound:
            let title = "Bucket Not Found"
            let message = "No bucket is configured for Cloud Storage."
            return [title, message]
        case .projectNotFound:
            let title = "Project Not Found"
            let message = "No project is configured for Cloud Storage."
            return [title, message]
        case .quotaExceeded:
            let title = "Quota Exceeded"
            let message = "Quota on your Cloud Storage bucket has been exceeded."
            return [title, message]
        case .unauthenticated:
            let title = "User Unauthenticated"
            let message = "User is unauthenticated. Authenticate and try again."
            return [title, message]
        case .unauthorized:
            let title = "User Not Authorized"
            let message = "User is not authorized to perform the desired action."
            return [title, message]
        case .retryLimitExceeded:
            let title = "Limit Exceeded"
            let message = "The maximum time limit on an operation has been exceeded."
            return [title, message]
        case .nonMatchingChecksum:
            let title = "Non Matching Checksum"
            let message = "File on the client does not match the checksum of the file recieved by the server. Try uploading again."
            return [title, message]
        case .cancelled:
            let title = "Cancelled"
            let message = "User canceled the operation."
            return [title, message]
        case .downloadSizeExceeded:
            let title = "File Size Exceeded"
            let message = "Size of the downloaded file exceeds the amount of memory allocated for the download."
            return [title, message]
        }
    }
    
    func showAlert(title: String, message: String) {
        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
            alert.dismiss(animated: true, completion: nil)
        }))
        
    }
}