[wasm] Support network status information

src/libraries/System.Net.NetworkInformation/Directory.Build.props

@@ -3,6 +3,5 @@
   <PropertyGroup>
     <StrongNameKeyId>Microsoft</StrongNameKeyId>
     <IncludePlatformAttributes>true</IncludePlatformAttributes>
-    <UnsupportedOSPlatforms>browser</UnsupportedOSPlatforms>
   </PropertyGroup>
 </Project>

src/libraries/System.Net.NetworkInformation/ref/System.Net.NetworkInformation.cs

@@ -337,6 +337,7 @@ public partial class NetworkChange
         public NetworkChange() { }
         [System.Runtime.Versioning.UnsupportedOSPlatform("illumos")]
         [System.Runtime.Versioning.UnsupportedOSPlatform("solaris")]
+        [System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
         public static event System.Net.NetworkInformation.NetworkAddressChangedEventHandler? NetworkAddressChanged { add { } remove { } }
         [System.Runtime.Versioning.UnsupportedOSPlatform("illumos")]
         [System.Runtime.Versioning.UnsupportedOSPlatform("solaris")]

src/libraries/System.Net.NetworkInformation/src/System.Net.NetworkInformation.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-Linux;$(NetCoreAppCurrent)-Android;$(NetCoreAppCurrent)-OSX;$(NetCoreAppCurrent)-iOS;$(NetCoreAppCurrent)-tvOS;$(NetCoreAppCurrent)-FreeBSD;$(NetCoreAppCurrent)-illumos;$(NetCoreAppCurrent)-Solaris;$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-Linux;$(NetCoreAppCurrent)-Android;$(NetCoreAppCurrent)-OSX;$(NetCoreAppCurrent)-iOS;$(NetCoreAppCurrent)-tvOS;$(NetCoreAppCurrent)-FreeBSD;$(NetCoreAppCurrent)-illumos;$(NetCoreAppCurrent)-Solaris;$(NetCoreAppCurrent)-Browser;$(NetCoreAppCurrent)</TargetFrameworks>
   </PropertyGroup>
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>
@@ -27,7 +27,7 @@
     <Compile Include="System\Net\NetworkInformation\MulticastIPAddressInformationCollection.cs" />
     <Compile Include="System\Net\NetworkInformation\NetBiosNodeType.cs" />
     <Compile Include="System\Net\NetworkInformation\NetEventSource.NetworkInformation.cs" />
-    <Compile Include="System\Net\NetworkInformation\NetworkAddressChange.cs" Condition="'$(TargetPlatformIdentifier)' != 'illumos' and '$(TargetPlatformIdentifier)' != 'Solaris'" />
+    <Compile Include="System\Net\NetworkInformation\NetworkAddressChange.cs" Condition="'$(TargetPlatformIdentifier)' != 'illumos' and '$(TargetPlatformIdentifier)' != 'Solaris' and '$(TargetPlatformIdentifier)' != 'Browser'" />
     <Compile Include="System\Net\NetworkInformation\NetworkAvailabilityEventArgs.cs" />
     <Compile Include="System\Net\NetworkInformation\NetworkChangeDelegates.cs" />
     <Compile Include="System\Net\NetworkInformation\NetworkInterface.cs" />
@@ -159,6 +159,16 @@
     <Compile Include="System\Net\NetworkInformation\NetworkInterfacePal.Android.cs" />
     <Compile Include="System\Net\NetworkInformation\AndroidNetworkInterface.cs" />
   </ItemGroup>
+  <!-- Android -->
+  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'Browser'">
+    <Compile Include="System\Net\NetworkInformation\IPGlobalPropertiesPal.Browser.cs" />
+    <Compile Include="System\Net\NetworkInformation\NetworkInterfacePal.Browser.cs" />
+    <Compile Include="System\Net\NetworkInformation\NetworkAddressChange.Browser.cs" />
+  </ItemGroup>
+  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'Browser'">
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.InteropServices.JavaScript\gen\JSImportGenerator\JSImportGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+    <Reference Include="System.Runtime.InteropServices.JavaScript" />
+  </ItemGroup>
   <!-- OSX -->
   <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'OSX' or '$(TargetPlatformIdentifier)' == 'iOS' or '$(TargetPlatformIdentifier)' == 'tvOS' or '$(TargetPlatformIdentifier)' == 'FreeBSD'">
     <Compile Include="System\Net\NetworkInformation\IPGlobalPropertiesPal.Bsd.cs" />

src/libraries/System.Net.NetworkInformation/src/System/Net/NetworkInformation/IPGlobalPropertiesPal.Browser.cs

@@ -0,0 +1,10 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace System.Net.NetworkInformation
+{
+    internal static class IPGlobalPropertiesPal
+    {
+        public static IPGlobalProperties GetIPGlobalProperties() => throw new PlatformNotSupportedException();
+    }
+}

src/libraries/System.Net.NetworkInformation/src/System/Net/NetworkInformation/NetworkAddressChange.Browser.cs

@@ -0,0 +1,61 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.Win32.SafeHandles;
+
+using System.ComponentModel;
+using System.Collections.Generic;
+using System.Net.Sockets;
+using System.Runtime.Versioning;
+using System.Threading;
+
+namespace System.Net.NetworkInformation
+{
+    public partial class NetworkChange
+    {
+        private static event NetworkAvailabilityChangedEventHandler? s_networkAvailabilityChanged;
+
+        [UnsupportedOSPlatform("illumos")]
+        [UnsupportedOSPlatform("solaris")]
+        public static event NetworkAvailabilityChangedEventHandler? NetworkAvailabilityChanged
+        {
+            add
+            {
+                if (s_networkAvailabilityChanged == null)
+                    BrowserNetworkInterfaceInterop.AddChangeListener(OnNetworkChanged);
+
+                s_networkAvailabilityChanged += value;
+            }
+            remove
+            {
+                s_networkAvailabilityChanged -= value;
+            }
+        }
+
+        private static void OnNetworkChanged(bool isOnline)
+        {
+            if (s_networkAvailabilityChanged != null)
+                s_networkAvailabilityChanged?.Invoke(null, new NetworkAvailabilityEventArgs(isOnline));
+        }
+
+        [UnsupportedOSPlatform("browser")]
+        [UnsupportedOSPlatform("illumos")]
+        [UnsupportedOSPlatform("solaris")]
+        public static event NetworkAddressChangedEventHandler? NetworkAddressChanged
+        {
+            add => throw new PlatformNotSupportedException();
+            remove => throw new PlatformNotSupportedException();
+        }
+
+        [EditorBrowsableAttribute(EditorBrowsableState.Never)]
+        [Obsolete("This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.", true)]
+        public NetworkChange()
+        {
+        }
+
+        // Introduced for supporting design-time loading of System.Windows.dll
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        [Obsolete("This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.", true)]
+        public static void RegisterNetworkChange(NetworkChange nc) { }
+    }
+}

src/libraries/System.Net.NetworkInformation/src/System/Net/NetworkInformation/NetworkAddressChange.OSX.cs

@@ -39,6 +39,7 @@ public partial class NetworkChange
         private static readonly AutoResetEvent s_runLoopStartedEvent = new AutoResetEvent(false);
         private static readonly AutoResetEvent s_runLoopEndedEvent = new AutoResetEvent(false);
 
+        [UnsupportedOSPlatform("browser")]
         [UnsupportedOSPlatform("illumos")]
         [UnsupportedOSPlatform("solaris")]
         public static event NetworkAddressChangedEventHandler? NetworkAddressChanged

src/libraries/System.Net.NetworkInformation/src/System/Net/NetworkInformation/NetworkAddressChange.Unix.cs

@@ -44,6 +44,7 @@ public partial class NetworkChange
         private static Timer? s_availabilityTimer;
         private static bool s_availabilityHasChanged;
 
+        [UnsupportedOSPlatform("browser")]
         [UnsupportedOSPlatform("illumos")]
         [UnsupportedOSPlatform("solaris")]
         public static event NetworkAddressChangedEventHandler? NetworkAddressChanged

src/libraries/System.Net.NetworkInformation/src/System/Net/NetworkInformation/NetworkAddressChange.UnknownUnix.cs

@@ -16,6 +16,7 @@ public NetworkChange()
         {
         }
 
+        [UnsupportedOSPlatform("browser")]
         [UnsupportedOSPlatform("illumos")]
         [UnsupportedOSPlatform("solaris")]
         public static event NetworkAddressChangedEventHandler? NetworkAddressChanged

src/libraries/System.Net.NetworkInformation/src/System/Net/NetworkInformation/NetworkAddressChange.Windows.cs

@@ -28,6 +28,7 @@ public partial class NetworkChange
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         [UnsupportedOSPlatform("illumos")]
         [UnsupportedOSPlatform("solaris")]
         public static event NetworkAddressChangedEventHandler? NetworkAddressChanged

src/libraries/System.Net.NetworkInformation/src/System/Net/NetworkInformation/NetworkInterfacePal.Browser.cs

@@ -0,0 +1,28 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices.JavaScript;
+
+namespace System.Net.NetworkInformation
+{
+    internal static partial class BrowserNetworkInterfaceInterop
+    {
+        [JSImport("INTERNAL.network_wasm_online")]
+        public static partial bool IsOnline();
+
+        [JSImport("INTERNAL.network_wasm_add_change_listener")]
+        public static partial void AddChangeListener([JSMarshalAs<JSType.Function<JSType.Boolean>>] Action<bool> handler);
+    }
+
+    internal static class NetworkInterfacePal
+    {
+        public static NetworkInterface[] GetAllNetworkInterfaces() => throw new PlatformNotSupportedException();
+        public static int IPv6LoopbackInterfaceIndex => throw new PlatformNotSupportedException();
+        public static int LoopbackInterfaceIndex => throw new PlatformNotSupportedException();
+
+        public static bool GetIsNetworkAvailable()
+        {
+            return BrowserNetworkInterfaceInterop.IsOnline();
+        }
+    }
+}

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/AddressParsingTests.cs

@@ -7,6 +7,7 @@
 
 namespace System.Net.NetworkInformation.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public class AddressParsingTests : FileCleanupTestBase
     {
         [Fact]

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/ConnectionsParsingTests.cs

@@ -6,6 +6,7 @@
 
 namespace System.Net.NetworkInformation.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public class ConnectionsParsingTests : FileCleanupTestBase
     {
         [Fact]

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/DnsParsingTests.cs

@@ -7,6 +7,7 @@
 
 namespace System.Net.NetworkInformation.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public class DnsParsingTests : FileCleanupTestBase
     {
         [InlineData("NetworkFiles/resolv.conf")]

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/IPGlobalPropertiesTest.cs

@@ -12,6 +12,7 @@
 
 namespace System.Net.NetworkInformation.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public class IPGlobalPropertiesTest
     {
         private readonly ITestOutputHelper _log;

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/LoggingTest.cs

@@ -6,6 +6,7 @@
 
 namespace System.Net.NetworkInformation.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public class LoggingTest
     {
         [Fact]

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/NetworkAddressChangedTests.cs

@@ -7,6 +7,7 @@ namespace System.Net.NetworkInformation.Tests
 {
     // Partial class used for both NetworkAddressChanged and NetworkAvailabilityChanged
     // so that the tests for each don't run concurrently
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public partial class NetworkChangedTests
     {
         private readonly NetworkAddressChangedEventHandler _addressHandler = delegate { };

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/NetworkAvailabilityChangedTests.cs

@@ -7,6 +7,7 @@ namespace System.Net.NetworkInformation.Tests
 {
     // Partial class used for both NetworkAddressChanged and NetworkAvailabilityChanged
     // so that the tests for each don't run concurrently
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public partial class NetworkChangedTests
     {
         private readonly NetworkAvailabilityChangedEventHandler _availabilityHandler = delegate { };

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceBasicTest.cs

@@ -20,6 +20,7 @@ public NetworkInterfaceBasicTest(ITestOutputHelper output)
         }
 
         [Fact]
+        [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
         public void BasicTest_GetNetworkInterfaces_AtLeastOne()
         {
             Assert.NotEqual<int>(0, NetworkInterface.GetAllNetworkInterfaces().Length);
@@ -131,6 +132,7 @@ public void BasicTest_AccessInstanceProperties_NoExceptions_Bsd()
 
         [Fact]
         [Trait("IPv4", "true")]
+        [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
         public void BasicTest_StaticLoopbackIndex_MatchesLoopbackNetworkInterface()
         {
             Assert.True(Capability.IPv4Support());
@@ -154,6 +156,7 @@ public void BasicTest_StaticLoopbackIndex_MatchesLoopbackNetworkInterface()
 
         [Fact]
         [Trait("IPv4", "true")]
+        [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
         public void BasicTest_StaticLoopbackIndex_ExceptionIfV4NotSupported()
         {
             Assert.True(Capability.IPv4Support());
@@ -163,6 +166,7 @@ public void BasicTest_StaticLoopbackIndex_ExceptionIfV4NotSupported()
 
         [Trait("IPv6", "true")]
         [ConditionalFact(typeof(Socket), nameof(Socket.OSSupportsIPv6))]
+        [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
         public void BasicTest_StaticIPv6LoopbackIndex_MatchesLoopbackNetworkInterface()
         {
             Assert.True(Capability.IPv6Support());
@@ -187,6 +191,7 @@ public void BasicTest_StaticIPv6LoopbackIndex_MatchesLoopbackNetworkInterface()
 
         [Trait("IPv6", "true")]
         [ConditionalFact(typeof(Socket), nameof(Socket.OSSupportsIPv6))]
+        [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
         public void BasicTest_StaticIPv6LoopbackIndex_ExceptionIfV6NotSupported()
         {
             Assert.True(Capability.IPv6Support());
@@ -277,6 +282,7 @@ public void BasicTest_GetIsNetworkAvailable_Success()
         [ActiveIssue("https://github.com/dotnet/runtime/issues/34690", TestPlatforms.Windows, TargetFrameworkMonikers.Netcoreapp, TestRuntimes.Mono)]
         [SkipOnPlatform(TestPlatforms.OSX | TestPlatforms.FreeBSD, "Expected behavior is different on OSX or FreeBSD")]
         [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.MacCatalyst | TestPlatforms.tvOS, "Not supported on Browser, iOS, MacCatalyst, or tvOS.")]
+        [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
         [InlineData(false)]
         [InlineData(true)]
         public async Task NetworkInterface_LoopbackInterfaceIndex_MatchesReceivedPackets(bool ipv6)

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceIPv4Statistics.cs

@@ -10,6 +10,7 @@
 
 namespace System.Net.NetworkInformation.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public class NetworkInterfaceIPv4Statistics
     {
         private readonly ITestOutputHelper _log;

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/PhysicalAddressTest.cs

@@ -6,6 +6,7 @@
 
 namespace System.Net.NetworkInformation.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public class PhysicalAddressTest
     {
         [Fact]

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/StatisticsParsingTests.cs

@@ -6,6 +6,7 @@
 
 namespace System.Net.NetworkInformation.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Browser, "Not supported on Browser")]
     public class StatisticsParsingTests : FileCleanupTestBase
     {
         [Fact]

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/System.Net.NetworkInformation.Functional.Tests.csproj

@@ -3,11 +3,9 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <StringResourcesPath>../../src/Resources/Strings.resx</StringResourcesPath>
     <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
-    <IgnoreForCI Condition="'$(TargetOS)' == 'Browser'">true</IgnoreForCI>
     <DefineConstants>$(DefineConstants);NETWORKINFORMATION_TEST</DefineConstants>
   </PropertyGroup>
   <ItemGroup>
-    <Compile Include="AssemblyInfo.cs" />
     <!-- Shared code with src assembly -->
     <Compile Include="..\..\src\System\Net\NetworkInformation\StringParsingHelpers.Addresses.cs"
              Link="SharedSource\StringParsingHelpers.Addresses.cs" />

src/mono/wasm/runtime/exports.ts

@@ -72,6 +72,7 @@ import { mono_wasm_bind_cs_function, mono_wasm_get_assembly_exports } from "./in
 import { mono_wasm_marshal_promise } from "./marshal-to-js";
 import { ws_wasm_abort, ws_wasm_close, ws_wasm_create, ws_wasm_open, ws_wasm_receive, ws_wasm_send } from "./web-socket";
 import { http_wasm_abort_request, http_wasm_abort_response, http_wasm_create_abort_controler, http_wasm_fetch, http_wasm_fetch_bytes, http_wasm_get_response_bytes, http_wasm_get_response_header_names, http_wasm_get_response_header_values, http_wasm_get_response_length, http_wasm_get_streamed_response_bytes, http_wasm_supports_streaming_response } from "./http";
+import { network_wasm_online, network_wasm_add_change_listener } from "./network-information";
 import { diagnostics } from "./diagnostics";
 import { mono_wasm_cancel_promise } from "./cancelable-promise";
 import {
@@ -485,6 +486,10 @@ const INTERNAL: any = {
     http_wasm_get_response_bytes,
     http_wasm_get_response_length,
     http_wasm_get_streamed_response_bytes,
+
+    // NetworkInformation
+    network_wasm_online,
+    network_wasm_add_change_listener
 };
 
 // this represents visibility in the javascript

src/mono/wasm/runtime/network-information.ts

@@ -0,0 +1,11 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+export function network_wasm_online(): boolean {
+    return globalThis.navigator && globalThis.navigator.onLine;
+}
+
+export function network_wasm_add_change_listener(listener: (onLine: boolean) => void): void {
+    window.addEventListener("offline", () => listener(network_wasm_online()));
+    window.addEventListener("online", () => listener(network_wasm_online()));
+}