extract key from PEM text

StringPEM.swift

//
//  StringPEM.swift
//  TestPEM
//
//  Created by Paul Aguilar on 10/4/18.
//  Copyright © 2018 Paul Aguilar. All rights reserved.
//

import Foundation

public extension String {
    
    // MARK: Methods
    
    private func plain() -> String {
        
        return String(self.filter { !" \n\t\r".contains($0) })
    }
    
    public func plainPEM() -> String {
        
        return self.split(separator: "\n").reduce("") { (result, next) -> String in
            
            guard !next.contains("-----") else {
                return result
            }
            
            let plainNext = String(next).plain()
            
            return result + plainNext
        }
    }
}