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329 lines
15 KiB
329 lines
15 KiB
4 years ago
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//
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// SessionDelegate.swift
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//
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// Copyright (c) 2014-2018 Alamofire Software Foundation (http://alamofire.org/)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import Foundation
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/// Class which implements the various `URLSessionDelegate` methods to connect various Alamofire features.
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open class SessionDelegate: NSObject {
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private let fileManager: FileManager
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weak var stateProvider: SessionStateProvider?
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var eventMonitor: EventMonitor?
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/// Creates an instance from the given `FileManager`.
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///
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/// - Parameter fileManager: `FileManager` to use for underlying file management, such as moving downloaded files.
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/// `.default` by default.
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public init(fileManager: FileManager = .default) {
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self.fileManager = fileManager
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}
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/// Internal method to find and cast requests while maintaining some integrity checking.
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///
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/// - Parameters:
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/// - task: The `URLSessionTask` for which to find the associated `Request`.
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/// - type: The `Request` subclass type to cast any `Request` associate with `task`.
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func request<R: Request>(for task: URLSessionTask, as type: R.Type) -> R? {
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guard let provider = stateProvider else {
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assertionFailure("StateProvider is nil.")
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return nil
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}
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return provider.request(for: task) as? R
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}
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}
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/// Type which provides various `Session` state values.
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protocol SessionStateProvider: AnyObject {
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var serverTrustManager: ServerTrustManager? { get }
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var redirectHandler: RedirectHandler? { get }
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var cachedResponseHandler: CachedResponseHandler? { get }
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func request(for task: URLSessionTask) -> Request?
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func didGatherMetricsForTask(_ task: URLSessionTask)
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func didCompleteTask(_ task: URLSessionTask, completion: @escaping () -> Void)
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func credential(for task: URLSessionTask, in protectionSpace: URLProtectionSpace) -> URLCredential?
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func cancelRequestsForSessionInvalidation(with error: Error?)
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}
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// MARK: URLSessionDelegate
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extension SessionDelegate: URLSessionDelegate {
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open func urlSession(_ session: URLSession, didBecomeInvalidWithError error: Error?) {
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eventMonitor?.urlSession(session, didBecomeInvalidWithError: error)
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stateProvider?.cancelRequestsForSessionInvalidation(with: error)
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}
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}
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// MARK: URLSessionTaskDelegate
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extension SessionDelegate: URLSessionTaskDelegate {
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/// Result of a `URLAuthenticationChallenge` evaluation.
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typealias ChallengeEvaluation = (disposition: URLSession.AuthChallengeDisposition, credential: URLCredential?, error: AFError?)
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open func urlSession(_ session: URLSession,
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task: URLSessionTask,
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didReceive challenge: URLAuthenticationChallenge,
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completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
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eventMonitor?.urlSession(session, task: task, didReceive: challenge)
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let evaluation: ChallengeEvaluation
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switch challenge.protectionSpace.authenticationMethod {
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case NSURLAuthenticationMethodServerTrust:
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evaluation = attemptServerTrustAuthentication(with: challenge)
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case NSURLAuthenticationMethodHTTPBasic, NSURLAuthenticationMethodHTTPDigest, NSURLAuthenticationMethodNTLM,
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NSURLAuthenticationMethodNegotiate, NSURLAuthenticationMethodClientCertificate:
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evaluation = attemptCredentialAuthentication(for: challenge, belongingTo: task)
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default:
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evaluation = (.performDefaultHandling, nil, nil)
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}
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if let error = evaluation.error {
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stateProvider?.request(for: task)?.didFailTask(task, earlyWithError: error)
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}
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completionHandler(evaluation.disposition, evaluation.credential)
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}
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/// Evaluates the server trust `URLAuthenticationChallenge` received.
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///
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/// - Parameter challenge: The `URLAuthenticationChallenge`.
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///
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/// - Returns: The `ChallengeEvaluation`.
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func attemptServerTrustAuthentication(with challenge: URLAuthenticationChallenge) -> ChallengeEvaluation {
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let host = challenge.protectionSpace.host
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guard challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust,
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let trust = challenge.protectionSpace.serverTrust
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else {
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return (.performDefaultHandling, nil, nil)
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}
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do {
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guard let evaluator = try stateProvider?.serverTrustManager?.serverTrustEvaluator(forHost: host) else {
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return (.performDefaultHandling, nil, nil)
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}
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try evaluator.evaluate(trust, forHost: host)
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return (.useCredential, URLCredential(trust: trust), nil)
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} catch {
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return (.cancelAuthenticationChallenge, nil, error.asAFError(or: .serverTrustEvaluationFailed(reason: .customEvaluationFailed(error: error))))
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}
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}
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/// Evaluates the credential-based authentication `URLAuthenticationChallenge` received for `task`.
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///
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/// - Parameters:
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/// - challenge: The `URLAuthenticationChallenge`.
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/// - task: The `URLSessionTask` which received the challenge.
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///
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/// - Returns: The `ChallengeEvaluation`.
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func attemptCredentialAuthentication(for challenge: URLAuthenticationChallenge,
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belongingTo task: URLSessionTask) -> ChallengeEvaluation {
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guard challenge.previousFailureCount == 0 else {
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return (.rejectProtectionSpace, nil, nil)
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}
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guard let credential = stateProvider?.credential(for: task, in: challenge.protectionSpace) else {
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return (.performDefaultHandling, nil, nil)
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}
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return (.useCredential, credential, nil)
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}
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open func urlSession(_ session: URLSession,
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task: URLSessionTask,
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didSendBodyData bytesSent: Int64,
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totalBytesSent: Int64,
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totalBytesExpectedToSend: Int64) {
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eventMonitor?.urlSession(session,
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task: task,
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didSendBodyData: bytesSent,
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totalBytesSent: totalBytesSent,
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totalBytesExpectedToSend: totalBytesExpectedToSend)
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stateProvider?.request(for: task)?.updateUploadProgress(totalBytesSent: totalBytesSent,
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totalBytesExpectedToSend: totalBytesExpectedToSend)
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}
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open func urlSession(_ session: URLSession,
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task: URLSessionTask,
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needNewBodyStream completionHandler: @escaping (InputStream?) -> Void) {
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eventMonitor?.urlSession(session, taskNeedsNewBodyStream: task)
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guard let request = request(for: task, as: UploadRequest.self) else {
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assertionFailure("needNewBodyStream did not find UploadRequest.")
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completionHandler(nil)
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return
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}
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completionHandler(request.inputStream())
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}
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open func urlSession(_ session: URLSession,
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task: URLSessionTask,
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willPerformHTTPRedirection response: HTTPURLResponse,
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newRequest request: URLRequest,
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completionHandler: @escaping (URLRequest?) -> Void) {
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eventMonitor?.urlSession(session, task: task, willPerformHTTPRedirection: response, newRequest: request)
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if let redirectHandler = stateProvider?.request(for: task)?.redirectHandler ?? stateProvider?.redirectHandler {
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redirectHandler.task(task, willBeRedirectedTo: request, for: response, completion: completionHandler)
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} else {
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completionHandler(request)
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}
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}
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open func urlSession(_ session: URLSession, task: URLSessionTask, didFinishCollecting metrics: URLSessionTaskMetrics) {
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eventMonitor?.urlSession(session, task: task, didFinishCollecting: metrics)
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stateProvider?.request(for: task)?.didGatherMetrics(metrics)
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stateProvider?.didGatherMetricsForTask(task)
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}
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open func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
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eventMonitor?.urlSession(session, task: task, didCompleteWithError: error)
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let request = stateProvider?.request(for: task)
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stateProvider?.didCompleteTask(task) {
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request?.didCompleteTask(task, with: error.map { $0.asAFError(or: .sessionTaskFailed(error: $0)) })
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}
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}
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@available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *)
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open func urlSession(_ session: URLSession, taskIsWaitingForConnectivity task: URLSessionTask) {
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eventMonitor?.urlSession(session, taskIsWaitingForConnectivity: task)
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}
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}
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// MARK: URLSessionDataDelegate
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extension SessionDelegate: URLSessionDataDelegate {
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open func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
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eventMonitor?.urlSession(session, dataTask: dataTask, didReceive: data)
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if let request = request(for: dataTask, as: DataRequest.self) {
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request.didReceive(data: data)
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} else if let request = request(for: dataTask, as: DataStreamRequest.self) {
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request.didReceive(data: data)
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} else {
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assertionFailure("dataTask did not find DataRequest or DataStreamRequest in didReceive")
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return
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}
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}
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open func urlSession(_ session: URLSession,
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dataTask: URLSessionDataTask,
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willCacheResponse proposedResponse: CachedURLResponse,
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completionHandler: @escaping (CachedURLResponse?) -> Void) {
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eventMonitor?.urlSession(session, dataTask: dataTask, willCacheResponse: proposedResponse)
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if let handler = stateProvider?.request(for: dataTask)?.cachedResponseHandler ?? stateProvider?.cachedResponseHandler {
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handler.dataTask(dataTask, willCacheResponse: proposedResponse, completion: completionHandler)
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} else {
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completionHandler(proposedResponse)
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}
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}
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}
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// MARK: URLSessionDownloadDelegate
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extension SessionDelegate: URLSessionDownloadDelegate {
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open func urlSession(_ session: URLSession,
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downloadTask: URLSessionDownloadTask,
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didResumeAtOffset fileOffset: Int64,
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expectedTotalBytes: Int64) {
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eventMonitor?.urlSession(session,
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downloadTask: downloadTask,
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didResumeAtOffset: fileOffset,
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expectedTotalBytes: expectedTotalBytes)
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guard let downloadRequest = request(for: downloadTask, as: DownloadRequest.self) else {
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assertionFailure("downloadTask did not find DownloadRequest.")
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return
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}
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downloadRequest.updateDownloadProgress(bytesWritten: fileOffset,
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totalBytesExpectedToWrite: expectedTotalBytes)
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}
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open func urlSession(_ session: URLSession,
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downloadTask: URLSessionDownloadTask,
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didWriteData bytesWritten: Int64,
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totalBytesWritten: Int64,
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totalBytesExpectedToWrite: Int64) {
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eventMonitor?.urlSession(session,
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downloadTask: downloadTask,
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didWriteData: bytesWritten,
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totalBytesWritten: totalBytesWritten,
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totalBytesExpectedToWrite: totalBytesExpectedToWrite)
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guard let downloadRequest = request(for: downloadTask, as: DownloadRequest.self) else {
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assertionFailure("downloadTask did not find DownloadRequest.")
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return
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}
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downloadRequest.updateDownloadProgress(bytesWritten: bytesWritten,
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totalBytesExpectedToWrite: totalBytesExpectedToWrite)
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}
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open func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
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eventMonitor?.urlSession(session, downloadTask: downloadTask, didFinishDownloadingTo: location)
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guard let request = request(for: downloadTask, as: DownloadRequest.self) else {
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assertionFailure("downloadTask did not find DownloadRequest.")
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return
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}
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guard let response = request.response else {
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fatalError("URLSessionDownloadTask finished downloading with no response.")
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}
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let (destination, options) = (request.destination)(location, response)
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eventMonitor?.request(request, didCreateDestinationURL: destination)
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do {
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if options.contains(.removePreviousFile), fileManager.fileExists(atPath: destination.path) {
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try fileManager.removeItem(at: destination)
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}
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if options.contains(.createIntermediateDirectories) {
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let directory = destination.deletingLastPathComponent()
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try fileManager.createDirectory(at: directory, withIntermediateDirectories: true)
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}
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try fileManager.moveItem(at: location, to: destination)
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request.didFinishDownloading(using: downloadTask, with: .success(destination))
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} catch {
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request.didFinishDownloading(using: downloadTask, with: .failure(.downloadedFileMoveFailed(error: error,
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source: location,
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destination: destination)))
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}
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}
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}
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