element-ios/Riot/Managers/PasswordStrength/PasswordStrengthManager.swift

/*
 Copyright 2019 New Vector Ltd
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

import Foundation
import zxcvbn_ios

/// PasswordStrengthManager computes password strength for a given string.
final class PasswordStrengthManager {
    
    // MARK: - Properties
    
    private let zxcvbn = DBZxcvbn()
    
    // MARK: - Public
    
    func passwordStrength(for password: String) -> PasswordStrength {
        guard let result = zxcvbn.passwordStrength(password) else {
            return .tooGuessable
        }
        return self.passwordStrength(from: result.score)
    }
    
    // MARK: - Private
    
    private func passwordStrength(from zxcvbnScore: Int32) -> PasswordStrength {
        let passwordStrengthRawValue = UInt(zxcvbnScore)
        
        guard let passwordStrength = PasswordStrength(rawValue: passwordStrengthRawValue) else {
            return .tooGuessable
        }
        
        return passwordStrength
    }
}