Add Network service and default sessions

Signed-off-by: Joseph Mattello <mail@joemattiello.com>

AltStore/Services/NetworkService.swift

@@ -0,0 +1,81 @@
+//
+//  NetworkService.swift
+//  SideStore
+//
+//  Created by Joseph Mattiello on 11/6/22.
+//  Copyright © 2022 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+public protocol Services {
+    var network: any NetworkService { get }
+}
+
+public protocol NetworkService {
+    var session: URLSession { get }
+    var sessionNoCache: URLSession { get }
+    var backgroundSession: URLSession { get }
+}
+ 
+public struct DefaultServices: Services {
+    public var network: NetworkService = AltNetworkService()
+}
+
+let AppServices = DefaultServices()
+
+final public class AltNetworkDelegate: NSObject, URLSessionTaskDelegate {
+    public struct Options: OptionSet {
+        public let rawValue: Int
+        public init(rawValue: Int) {
+            self.rawValue = rawValue
+        }
+        
+        public static let redirect = Options(rawValue: 1 << 0)
+        public static let all: Options = [.redirect]
+    }
+    
+    var options: Options = .all
+    
+//    func urlSession(_ session: URLSession, task: URLSessionTask, willPerformHTTPRedirection response: HTTPURLResponse, newRequest request: URLRequest, completionHandler: @escaping (URLRequest?) -> Void) {
+//        if options.contains(.redirect) {
+//            completionHandler(request)
+//        } else {
+//            completionHandler(nil)
+//        }
+//    }
+    
+    public func urlSession(_ session: URLSession, task: URLSessionTask, willPerformHTTPRedirection response: HTTPURLResponse, newRequest request: URLRequest) async -> URLRequest? {
+        if options.contains(.redirect) {
+            return request
+        } else {
+            return nil
+        }
+    }
+}
+
+public final class AltNetworkService: NetworkService {
+    public let session: URLSession = {
+        let configuration: URLSessionConfiguration = URLSessionConfiguration.default
+        configuration.httpShouldSetCookies = true
+        configuration.httpShouldUsePipelining = true
+        let session = URLSession.init(configuration: configuration, delegate: AltNetworkDelegate(), delegateQueue: nil)
+        return session
+    }()
+    
+    public let sessionNoCache: URLSession = {
+        let configuration: URLSessionConfiguration = URLSessionConfiguration.default
+        configuration.requestCachePolicy = .reloadIgnoringLocalCacheData
+        configuration.urlCache = nil        
+        let session = URLSession.init(configuration: configuration, delegate: AltNetworkDelegate(), delegateQueue: nil)
+        return session
+    }()
+    
+    static let backgroundSessionIdentifier = "SideStoreBackgroundSession"
+    
+    public let backgroundSession: URLSession = {
+        let configuration: URLSessionConfiguration = URLSessionConfiguration.background(withIdentifier: AltNetworkService.backgroundSessionIdentifier)
+        let session = URLSession.init(configuration: configuration, delegate: AltNetworkDelegate(), delegateQueue: nil)
+        return session
+    }()
+}