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Pods/Kingfisher/Sources/Networking/AuthenticationChallengeResponsable.swift

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+//
+//  AuthenticationChallengeResponsable.swift
+//  Kingfisher
+//
+//  Created by Wei Wang on 2018/10/11.
+//
+//  Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
+//
+//  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
+
+@available(*, deprecated, message: "Typo. Use `AuthenticationChallengeResponsible` instead", renamed: "AuthenticationChallengeResponsible")
+public typealias AuthenticationChallengeResponsable = AuthenticationChallengeResponsible
+
+/// Protocol indicates that an authentication challenge could be handled.
+public protocol AuthenticationChallengeResponsible: AnyObject {
+
+    /// Called when a session level authentication challenge is received.
+    /// This method provide a chance to handle and response to the authentication
+    /// challenge before downloading could start.
+    ///
+    /// - Parameters:
+    ///   - downloader: The downloader which receives this challenge.
+    ///   - challenge: An object that contains the request for authentication.
+    ///   - completionHandler: A handler that your delegate method must call.
+    ///
+    /// - Note: This method is a forward from `URLSessionDelegate.urlSession(:didReceiveChallenge:completionHandler:)`.
+    ///         Please refer to the document of it in `URLSessionDelegate`.
+    func downloader(
+        _ downloader: ImageDownloader,
+        didReceive challenge: URLAuthenticationChallenge,
+        completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void)
+
+    /// Called when a task level authentication challenge is received.
+    /// This method provide a chance to handle and response to the authentication
+    /// challenge before downloading could start.
+    ///
+    /// - Parameters:
+    ///   - downloader: The downloader which receives this challenge.
+    ///   - task: The task whose request requires authentication.
+    ///   - challenge: An object that contains the request for authentication.
+    ///   - completionHandler: A handler that your delegate method must call.
+    func downloader(
+        _ downloader: ImageDownloader,
+        task: URLSessionTask,
+        didReceive challenge: URLAuthenticationChallenge,
+        completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void)
+}
+
+extension AuthenticationChallengeResponsible {
+
+    public func downloader(
+        _ downloader: ImageDownloader,
+        didReceive challenge: URLAuthenticationChallenge,
+        completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void)
+    {
+        if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust {
+            if let trustedHosts = downloader.trustedHosts, trustedHosts.contains(challenge.protectionSpace.host) {
+                let credential = URLCredential(trust: challenge.protectionSpace.serverTrust!)
+                completionHandler(.useCredential, credential)
+                return
+            }
+        }
+
+        completionHandler(.performDefaultHandling, nil)
+    }
+
+    public func downloader(
+        _ downloader: ImageDownloader,
+        task: URLSessionTask,
+        didReceive challenge: URLAuthenticationChallenge,
+        completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void)
+    {
+        completionHandler(.performDefaultHandling, nil)
+    }
+
+}