VPN: Add TunnelsManager to manage the tunnels in the app

Signed-off-by: Roopesh Chander <roop@roopc.net>

WireGuard/WireGuard.xcodeproj/project.pbxproj

@@ -12,6 +12,7 @@
 		6F7774E421718281006A79B3 /* TunnelsListTableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6F7774E321718281006A79B3 /* TunnelsListTableViewController.swift */; };
 		6F7774E82172020C006A79B3 /* Configuration.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6F7774E72172020C006A79B3 /* Configuration.swift */; };
 		6F7774EA217229DB006A79B3 /* IPAddressRange.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6F7774E9217229DB006A79B3 /* IPAddressRange.swift */; };
+		6F7774EF21722D97006A79B3 /* TunnelsManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6F7774EE21722D97006A79B3 /* TunnelsManager.swift */; };
 		6FF4AC1F211EC472002C96EB /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 6FF4AC1E211EC472002C96EB /* Assets.xcassets */; };
 		6FF4AC22211EC472002C96EB /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 6FF4AC20211EC472002C96EB /* LaunchScreen.storyboard */; };
 		6FF4AC472120B9E0002C96EB /* NetworkExtension.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 6FF4AC462120B9E0002C96EB /* NetworkExtension.framework */; };
@@ -23,6 +24,7 @@
 		6F7774E321718281006A79B3 /* TunnelsListTableViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TunnelsListTableViewController.swift; sourceTree = "<group>"; };
 		6F7774E72172020C006A79B3 /* Configuration.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Configuration.swift; sourceTree = "<group>"; };
 		6F7774E9217229DB006A79B3 /* IPAddressRange.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = IPAddressRange.swift; sourceTree = "<group>"; };
+		6F7774EE21722D97006A79B3 /* TunnelsManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TunnelsManager.swift; sourceTree = "<group>"; };
 		6FF4AC14211EC46F002C96EB /* WireGuard.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = WireGuard.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		6FF4AC1E211EC472002C96EB /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		6FF4AC21211EC472002C96EB /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
@@ -71,6 +73,14 @@
 			path = Model;
 			sourceTree = "<group>";
 		};
+		6F7774ED21722D0C006A79B3 /* VPN */ = {
+			isa = PBXGroup;
+			children = (
+				6F7774EE21722D97006A79B3 /* TunnelsManager.swift */,
+			);
+			path = VPN;
+			sourceTree = "<group>";
+		};
 		6FF4AC0B211EC46F002C96EB = {
 			isa = PBXGroup;
 			children = (
@@ -93,6 +103,7 @@
 			children = (
 				6F7774E6217201E0006A79B3 /* Model */,
 				6F7774DD217181B1006A79B3 /* UI */,
+				6F7774ED21722D0C006A79B3 /* VPN */,
 				6FF4AC482120B9E0002C96EB /* WireGuard.entitlements */,
 				6FF4AC1E211EC472002C96EB /* Assets.xcassets */,
 				6FF4AC20211EC472002C96EB /* LaunchScreen.storyboard */,
@@ -186,6 +197,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				6F7774E421718281006A79B3 /* TunnelsListTableViewController.swift in Sources */,
+				6F7774EF21722D97006A79B3 /* TunnelsManager.swift in Sources */,
 				6F7774E2217181B1006A79B3 /* AppDelegate.swift in Sources */,
 				6F7774EA217229DB006A79B3 /* IPAddressRange.swift in Sources */,
 				6F7774E82172020C006A79B3 /* Configuration.swift in Sources */,

WireGuard/WireGuard/VPN/TunnelsManager.swift

@@ -0,0 +1,82 @@
+//
+//  TunnelsManager.swift
+//  WireGuard
+//
+//  Created by Roopesh Chander on 13/10/18.
+//  Copyright © 2018 WireGuard LLC. All rights reserved.
+//
+
+import Foundation
+
+class TunnelProviderManager {
+    // Mock of NETunnelProviderManager
+    var name: String
+    var tunnelConfiguration: TunnelConfiguration
+    init(tunnelConfiguration: TunnelConfiguration) {
+        self.name = tunnelConfiguration.name
+        self.tunnelConfiguration = tunnelConfiguration
+    }
+}
+
+class TunnelContainer {
+    var name: String { return tunnelProvider.name }
+    let tunnelProvider: TunnelProviderManager
+    var index: Int
+    init(tunnel: TunnelProviderManager, index: Int) {
+        self.tunnelProvider = tunnel
+        self.index = index
+    }
+}
+
+class TunnelsManager {
+
+    var tunnels: [TunnelContainer]
+
+    enum TunnelsManagerError: Error {
+        case tunnelsUninitialized
+    }
+
+    init(tunnelProviders: [TunnelProviderManager]) {
+        var tunnels: [TunnelContainer] = []
+        for (i, tunnelProvider) in tunnelProviders.enumerated() {
+            let tunnel = TunnelContainer(tunnel: tunnelProvider, index: i)
+            tunnels.append(tunnel)
+        }
+        self.tunnels = tunnels
+    }
+
+    static func create(completionHandler: (TunnelsManager?) -> Void) {
+        completionHandler(TunnelsManager(tunnelProviders: []))
+    }
+
+    func add(tunnelConfiguration: TunnelConfiguration, completionHandler: @escaping (Error?) -> Void) {
+        let tunnelProvider = TunnelProviderManager(tunnelConfiguration: tunnelConfiguration)
+        for tunnel in tunnels {
+            tunnel.index = tunnel.index + 1
+        }
+        let tunnel = TunnelContainer(tunnel: tunnelProvider, index: 0)
+        tunnels.insert(tunnel, at: 0)
+        completionHandler(nil)
+    }
+
+    func modify(tunnel: TunnelContainer, with tunnelConfiguration: TunnelConfiguration, completionHandler: @escaping (Error?) -> Void) {
+        tunnel.tunnelProvider.tunnelConfiguration = tunnelConfiguration
+        completionHandler(nil)
+    }
+
+    func remove(tunnel: TunnelContainer, completionHandler: @escaping (Error?) -> Void) {
+        for i in ((tunnel.index + 1) ..< tunnels.count) {
+            tunnels[i].index = tunnels[i].index + 1
+        }
+        tunnels.remove(at: tunnel.index)
+        completionHandler(nil)
+    }
+
+    func numberOfTunnels() -> Int {
+        return tunnels.count
+    }
+
+    func tunnel(at index: Int) -> TunnelContainer {
+        return tunnels[index]
+    }
+}