import Foundation import Alamofirepublic class AuthorizationManager: Manager {public typealias NetworkSuccessHandler = (AnyObject?) -> Voidpublic typealias NetworkFailureHandler = (NSHTTPURLResponse?, AnyObject?, NSError) -> Voidprivate typealias CachedTask = (NSHTTPURLResponse?, AnyObject?, NSError?) -> Voidprivate var cachedTasks = Array<CachedTask>()private var isRefreshing = falsepublic func startRequest(method method: Alamofire.Method,URLString: URLStringConvertible,parameters: [String: AnyObject]?,encoding: ParameterEncoding,success: NetworkSuccessHandler?,failure: NetworkFailureHandler?) -> Request?{let cachedTask: CachedTask = { [weak self] URLResponse, data, error inguard let strongSelf = self else { return }if let error = error {failure?(URLResponse, data, error)} else {strongSelf.startRequest(method: method,URLString: URLString,parameters: parameters,encoding: encoding,success: success,failure: failure)}}if self.isRefreshing {self.cachedTasks.append(cachedTask)return nil}// Append your auth tokens here to your parameterslet request = self.request(method, URLString, parameters: parameters, encoding: encoding)request.response { [weak self] request, response, data, error inguard let strongSelf = self else { return }if let response = response where response.statusCode == 401 {strongSelf.cachedTasks.append(cachedTask)strongSelf.refreshTokens()return}if let error = error {failure?(response, data, error)} else {success?(data)}}return request}func refreshTokens() {self.isRefreshing = true// Make the refresh call and run the following in the success closure to restart the cached taskslet cachedTaskCopy = self.cachedTasksself.cachedTasks.removeAll()cachedTaskCopy.map { $0(nil, nil, nil) }self.isRefreshing = false} }

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