aalemi97

func refreshToken(completion: @escaping (_ isSuccess: Bool) -> Void) {
    guard let apiKey = UserDefaultsManager.shared.getUserCredentials().apiKey,
        let secretKey = UserDefaultsManager.shared.getUserCredentials().secretKey else { return }
    let parameters = ["grant_type": "client_credentials", "client_id": apiKey, "client_secret": secretKey]
    AF.request(authorize, method: .post, parameters: parameters, encoding: JSONEncoding.default).responseJSON { response in
        if let data = response.data, let token = (try? JSONSerialization.jsonObject(with: data, options: [])
            as? [String: Any])?["access_token"] as? String {
            UserDefaultsManager.shared.setToken(token: token)
            print("\nRefresh token completed successfully. New token is: \(token)\n")
            completion(true)

aalemi97

func retry(_ request: Request, for session: Session, dueTo error: Error,
              completion: @escaping (RetryResult) -> Void) {
    guard request.retryCount < retryLimit else {
        completion(.doNotRetry)
        return
    }
    print("\nretried; retry count: \(request.retryCount)\n")
    refreshToken { isSuccess in
        isSuccess ? completion(.retry) : completion(.doNotRetry)
    }

aalemi97

func adapt(_ urlRequest: URLRequest, for session: Session, completion: @escaping (Result<URLRequest, Error>) -> Void) {
    var request = urlRequest
    guard let token = UserDefaultsManager.shared.getToken() else {
        completion(.success(urlRequest))
        return
    }
    let bearerToken = "Bearer \(token)"
    request.setValue(bearerToken, forHTTPHeaderField: "Authorization")
    print("\nadapted; token added to the header field is: \(bearerToken)\n")
    completion(.success(request))

aalemi97

func request(_ url: String, method: HTTPMethod = .get, parameters: Parameters? = nil,
             encoding: ParameterEncoding = URLEncoding.queryString, headers: HTTPHeaders? = nil,
             interceptor: RequestInterceptor? = nil, completion: @escaping completionHandler) {
    AF.request(url, method: method, parameters: parameters, encoding: encoding,
               headers: headers, interceptor: interceptor ?? self).validate().responseJSON { (response) in
        if let data = response.data {
            completion(.success(data))
        } else {
            completion(.failure(.unavailableServer))
        }

aalemi97

import Foundation
class UserDefaultsManager {
    enum Key: String {
        case apiKey
        case secretKey
        case token
        case isSignedIn
    }
    static let shared: UserDefaultsManager = {
        return UserDefaultsManager()

aalemi97

import Alamofire
class NetworkManager {
    static let shared: NetworkManager = {
        return NetworkManager()
    }()
    typealias completionHandler = ((Result<Data, CustomError>) -> Void)
    var request: Alamofire.Request?
    let retryLimit = 3
    let authorize = "https://api.petfinder.com/v2/oauth2/token"
    func authorize(parameters: [String: Any]?, completion: @escaping completionHandler) {

aalemi97

func login(apiKey: String, secretKey: String) {
        let parameters = ["grant_type": "client_credentials", "client_id": apiKey, "client_secret": secretKey]
        NetworkManager.shared.authorize(parameters: parameters) { (result) in
            switch result {
            case .success(let data):
                if let token = (try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any])?["access_token"] as? String {
                    UserDefaultsManager.shared.signIn(apiKey: apiKey, secretKey: secretKey, token: token)
                }
            case .failure(let error):
                print(error)