AuthenticationViewController extension for AuthenticationViewController Swift Library for OAuth2 Authentication

OAuthGoogle.swift

//
//  OAuthGoogle.swift
//  AuthenticationViewController
//
//  Created by Jose Antonio Lopez (jalopezsuarez@gmail.com) on 01/01/2018.
//  Copyright © 2018 Jose Antonio Lopez. All rights reserved.
//

import Foundation
import AuthenticationViewController

struct OAuthGoogle: AuthenticationProvider {
    
    let title: String?
    let clientId: String
    let clientSecret: String
    let scopes: [String]
    
    let redirectURI = "com.googleusercontent.apps.188766122934-0t21j64fd4qmcomewpho6jeqwxe6kpwq:/oauth2redirect"
    
    var authorizationURL: URL {
        var request = ""
        
        request = request + "https://accounts.google.com/o/oauth2/auth"
        request = request + "?" + "client_id=\(clientId)"
        request = request + "&" + "scope=\(scopes.joined(separator: "+"))"
        request = request + "&" + "redirect_uri=\(redirectURI)"
        request = request + "&" + "response_type=code"
        
        return URL(string: request)!
    }
    
    var accessTokenURL: URL {
        return URL(string: "https://accounts.google.com/o/oauth2/token")!
    }
    
    var parameters: [String: String] {
        return ["grant_type": "authorization_code", "redirect_uri": redirectURI]
    }
    
    // MARK: Initialisers
    
    init(clientId: String, clientSecret: String, scopes: [String]) {
        self.clientId = clientId
        self.clientSecret = clientSecret
        self.scopes = scopes
        self.title = "Google"
    }
}