passforios/passKit/Helpers/Utils.swift

//
//  Utils.swift
//  pass
//
//  Created by Mingshen Sun on 8/2/2017.
//  Copyright © 2017 Bob Sun. All rights reserved.
//

import Foundation
import SwiftyUserDefaults
import KeychainAccess

public class Utils {
    public static func removeFileIfExists(atPath path: String) {
        let fm = FileManager.default
        do {
            if fm.fileExists(atPath: path) {
                try fm.removeItem(atPath: path)
            }
        } catch {
            print(error)
        }
    }
    public static func removeFileIfExists(at url: URL) {
        removeFileIfExists(atPath: url.path)
    }

    public static func getLastSyncedTimeString() -> String {
        guard let lastSyncedTime = SharedDefaults[.lastSyncedTime] else {
            return "Oops! Sync again?"
        }
        let formatter = DateFormatter()
        formatter.dateStyle = .medium
        formatter.timeStyle = .short
        return formatter.string(from: lastSyncedTime)
    }
    
    public static func generatePassword(length: Int) -> String{
        switch SharedDefaults[.passwordGeneratorFlavor] {
        case "Random":
            return randomString(length: length)
        case "Apple":
            return Keychain.generatePassword()
        default:
            return randomString(length: length)
        }
    }
    
    public static func randomString(length: Int) -> String {
        
        let letters : NSString = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*_+-="
        let len = UInt32(letters.length)
        
        var randomString = ""
        
        for _ in 0 ..< length {
            let rand = arc4random_uniform(len)
            var nextChar = letters.character(at: Int(rand))
            randomString += NSString(characters: &nextChar, length: 1) as String
        }
        
        return randomString
    }
    
    public static func getPasswordFromKeychain(name: String) -> String? {
        let keychain = Keychain(service: Globals.bundleIdentifier, accessGroup: Globals.groupIdentifier)
        do {
            return try keychain.getString(name)
        } catch {
            print(error)
        }
        return nil
    }
    
    public static func addPasswordToKeychain(name: String, password: String?) {
        let keychain = Keychain(service: Globals.bundleIdentifier, accessGroup: Globals.groupIdentifier)
        keychain[name] = password
    }
    
    public static func removeKeychain(name: String) {
        let keychain = Keychain(service: Globals.bundleIdentifier, accessGroup: Globals.groupIdentifier)
        do {
            try keychain.remove(name)
        } catch {
            print(error)
        }
    }
    
    public static func removeAllKeychain() {
        let keychain = Keychain(service: Globals.bundleIdentifier, accessGroup: Globals.groupIdentifier)
        do {
            try keychain.removeAll()
        } catch {
            print(error)
        }
    }
    public static func copyToPasteboard(textToCopy: String?) {
        guard textToCopy != nil else {
            return
        }
        UIPasteboard.general.string = textToCopy
    }
    public static func attributedPassword(plainPassword: String) -> NSAttributedString{
        let attributedPassword = NSMutableAttributedString.init(string: plainPassword)
        // draw all digits in the password into red
        // draw all punctuation characters in the password into blue
        for (index, element) in plainPassword.unicodeScalars.enumerated() {
            var charColor = UIColor.darkText
            if NSCharacterSet.decimalDigits.contains(element) {
                charColor = Globals.digitColor
            } else if !NSCharacterSet.letters.contains(element) {
                charColor = Globals.symbolColor
            } else {
                charColor = Globals.letterColor
            }
            attributedPassword.addAttribute(NSAttributedStringKey.foregroundColor, value: charColor, range: NSRange(location: index, length: 1))
        }
        return attributedPassword
    }
    public static func initDefaultKeys() {
        if SharedDefaults[.passwordGeneratorFlavor] == "" {
            SharedDefaults[.passwordGeneratorFlavor] = "Random"
        }
    }
}