chore: clear session on launch if vpn unconfigured (#76)

Author: ethanndickson

Coder Desktop/Coder Desktop/Coder_DesktopApp.swift

@@ -49,6 +49,14 @@ class AppDelegate: NSObject, NSApplicationDelegate {
             name: .NEVPNStatusDidChange,
             object: nil
         )
+        Task {
+            // If there's no NE config, then the user needs to sign in.
+            // However, they might have a session from a previous install, so we
+            // need to clear it.
+            if await !vpn.loadNetworkExtensionConfig() {
+                state.clearSession()
+            }
+        }
     }
 
     // This function MUST eventually call `NSApp.reply(toApplicationShouldTerminate: true)`

Coder Desktop/Coder Desktop/NetworkExtension.swift

@@ -24,13 +24,16 @@ enum NetworkExtensionState: Equatable {
 /// An actor that handles configuring, enabling, and disabling the VPN tunnel via the
 /// NetworkExtension APIs.
 extension CoderVPNService {
-    func loadNetworkExtensionConfig() async {
+    // Attempts to load the NetworkExtension configuration, returning true if successful.
+    func loadNetworkExtensionConfig() async -> Bool {
         do {
             let tm = try await getTunnelManager()
             neState = .disabled
             serverAddress = tm.protocolConfiguration?.serverAddress
+            return true
         } catch {
             neState = .unconfigured
+            return false
         }
     }
 

Coder Desktop/Coder Desktop/VPNService.swift

@@ -35,6 +35,8 @@ enum VPNServiceError: Error, Equatable {
             state.description
         }
     }
+
+    var localizedDescription: String { description }
 }
 
 @MainActor
@@ -67,9 +69,6 @@ final class CoderVPNService: NSObject, VPNService {
     override init() {
         super.init()
         installSystemExtension()
-        Task {
-            await loadNetworkExtensionConfig()
-        }
     }
 
     deinit {

Coder Desktop/Coder Desktop/Views/LoginForm.swift

@@ -204,6 +204,8 @@ enum LoginError: Error {
             "Could not authenticate with Coder deployment:\n\(err.description)"
         }
     }
+
+    var localizedDescription: String { description }
 }
 
 enum LoginPage {

Coder Desktop/Coder Desktop/Views/VPNMenu.swift

@@ -89,6 +89,7 @@ struct VPNMenu<VPN: VPNService>: View {
         !state.hasSession ||
             vpn.state == .connecting ||
             vpn.state == .disconnecting ||
+            // Prevent starting the VPN before the user has approved the system extension.
             vpn.state == .failed(.systemExtensionError(.needsUserApproval))
     }
 }

Coder Desktop/CoderSDK/Client.swift

@@ -134,4 +134,6 @@ public enum ClientError: Error {
             "Failed to encode body: \(error)"
         }
     }
+
+    public var localizedDescription: String { description }
 }

Coder Desktop/VPN/Manager.swift

@@ -276,6 +276,8 @@ enum ManagerError: Error {
             "Failed to communicate with dylib over tunnel: \(err)"
         }
     }
+
+    var localizedDescription: String { description }
 }
 
 func writeVpnLog(_ log: Vpn_Log) {

Coder Desktop/VPN/TunnelHandle.swift

@@ -82,6 +82,8 @@ enum TunnelHandleError: Error {
         case let .close(errs): "close tunnel: \(errs.map(\.localizedDescription).joined(separator: ", "))"
         }
     }
+
+    var localizedDescription: String { description }
 }
 
 enum OpenTunnelError: Int32 {

Coder Desktop/VPNLib/Download.swift

@@ -11,7 +11,7 @@ public enum ValidationError: Error {
     case missingInfoPList
     case invalidVersion(version: String?)
 
-    public var errorDescription: String? {
+    public var description: String {
         switch self {
         case .fileNotFound:
             "The file does not exist."
@@ -31,6 +31,8 @@ public enum ValidationError: Error {
             "Info.plist is not embedded within the dylib."
         }
     }
+
+    public var localizedDescription: String { description }
 }
 
 public class SignatureValidator {
@@ -156,7 +158,7 @@ public enum DownloadError: Error {
     case networkError(any Error)
     case fileOpError(any Error)
 
-    var localizedDescription: String {
+    public var description: String {
         switch self {
         case let .unexpectedStatusCode(code):
             "Unexpected HTTP status code: \(code)"
@@ -168,4 +170,6 @@ public enum DownloadError: Error {
             "Received non-HTTP response"
         }
     }
+
+    public var localizedDescription: String { description }
 }

Coder Desktop/VPNLib/Receiver.swift

@@ -75,9 +75,18 @@ actor Receiver<RecvMsg: Message> {
     }
 }
 
-enum ReceiveError: Error {
+public enum ReceiveError: Error {
     case readError(String)
     case invalidLength
+
+    public var description: String {
+        switch self {
+        case let .readError(err): "read error: \(err)"
+        case .invalidLength: "invalid message length"
+        }
+    }
+
+    public var localizedDescription: String { description }
 }
 
 func deserializeLen(_ data: Data) throws -> UInt32 {