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weibo/Pods/Alamofire/Source/RedirectHandler.swift

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4 years ago
//
// RedirectHandler.swift
//
// Copyright (c) 2014-2018 Alamofire Software Foundation (http://alamofire.org/)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
import Foundation
/// A type that handles how an HTTP redirect response from a remote server should be redirected to the new request.
public protocol RedirectHandler {
/// Determines how the HTTP redirect response should be redirected to the new request.
///
/// The `completion` closure should be passed one of three possible options:
///
/// 1. The new request specified by the redirect (this is the most common use case).
/// 2. A modified version of the new request (you may want to route it somewhere else).
/// 3. A `nil` value to deny the redirect request and return the body of the redirect response.
///
/// - Parameters:
/// - task: The `URLSessionTask` whose request resulted in a redirect.
/// - request: The `URLRequest` to the new location specified by the redirect response.
/// - response: The `HTTPURLResponse` containing the server's response to the original request.
/// - completion: The closure to execute containing the new `URLRequest`, a modified `URLRequest`, or `nil`.
func task(_ task: URLSessionTask,
willBeRedirectedTo request: URLRequest,
for response: HTTPURLResponse,
completion: @escaping (URLRequest?) -> Void)
}
// MARK: -
/// `Redirector` is a convenience `RedirectHandler` making it easy to follow, not follow, or modify a redirect.
public struct Redirector {
/// Defines the behavior of the `Redirector` type.
public enum Behavior {
/// Follow the redirect as defined in the response.
case follow
/// Do not follow the redirect defined in the response.
case doNotFollow
/// Modify the redirect request defined in the response.
case modify((URLSessionTask, URLRequest, HTTPURLResponse) -> URLRequest?)
}
/// Returns a `Redirector` with a `.follow` `Behavior`.
public static let follow = Redirector(behavior: .follow)
/// Returns a `Redirector` with a `.doNotFollow` `Behavior`.
public static let doNotFollow = Redirector(behavior: .doNotFollow)
/// The `Behavior` of the `Redirector`.
public let behavior: Behavior
/// Creates a `Redirector` instance from the `Behavior`.
///
/// - Parameter behavior: The `Behavior`.
public init(behavior: Behavior) {
self.behavior = behavior
}
}
// MARK: -
extension Redirector: RedirectHandler {
public func task(_ task: URLSessionTask,
willBeRedirectedTo request: URLRequest,
for response: HTTPURLResponse,
completion: @escaping (URLRequest?) -> Void) {
switch behavior {
case .follow:
completion(request)
case .doNotFollow:
completion(nil)
case let .modify(closure):
let request = closure(task, request, response)
completion(request)
}
}
}