Refresh token handling with Moya

MoyaProvider+Ext.swift

import Alamofire
import Foundation
import Moya

extension MoyaProvider {
    
    convenience init(handleRefreshToken: Bool) {
        if handleRefreshToken {
            self.init(requestClosure: MoyaProvider.endpointResolver(),
                      manager: DefaultAlamofireManager.sharedManager,
                      plugins: [moyalogger])
        } else {
            self.init()
        }
    }
    
    static func endpointResolver() -> MoyaProvider<Target>.RequestClosure {
        return { endpoint, closure in
            
            // Getting the original request
            let request = try! endpoint.urlRequest()
            
            do {
                
                let isExpired = try EmailAuthorizationService.isTokenExpired()
                if !isExpired {
                    // Token is valid, so just resume the original request
                    closure(.success(request))
                    return
                }
                
                //Do a request to refresh the authtoken based on refreshToken
                EmailAuthorizationService.refreshTokenIfNeeded { result in
                    switch result {
                    case .success:
                        // This line will "resume" the actual request
                        closure(.success(request))
                        
                    case .failure(let error):
                        //something went terrible wrong! Request will not be performed
                        closure(.failure(MoyaError.parameterEncoding(error)))
                    }
                }
                
            } catch {
                AppRouter.shared.logOut()
            }
            
        }
    }
    
}