Add support for NetStandard 2.0+

Author: RobThree

AutoRefreshTokenHttpMessageHandler/AutoRefreshTokenHttpMessageHandler.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFramework>net8.0</TargetFramework>
+		<TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 		<LangVersion>latest</LangVersion>
@@ -34,7 +34,14 @@
 	</ItemGroup>
 
 	<ItemGroup>
+		<PackageReference Include="Microsoft.Bcl.TimeProvider" Version="8.0.1" />
 		<PackageReference Include="Microsoft.Extensions.Options" Version="8.0.2" />
+		<PackageReference Include="PolySharp" Version="1.14.1">
+		  <PrivateAssets>all</PrivateAssets>
+		  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+		</PackageReference>
+		<PackageReference Include="System.Net.Http.Json" Version="8.0.0" />
+		<PackageReference Include="System.Text.Json" Version="8.0.2" />
 	</ItemGroup>
 
 </Project>

AutoRefreshTokenHttpMessageHandler/TokenAuthenticationService.cs

@@ -35,14 +35,14 @@ private async Task<Token> RetrieveTokenAsync(string grantType, CancellationToken
         {
             result.EnsureSuccessStatusCode();
             return Token.FromTokenResponse(
-                await result.Content.ReadFromJsonAsync<TokenResponse>(cancellationToken) ?? throw new HttpRequestException(Translations.INVALID_OR_UNEXPECTED_RESPONSE, null, result.StatusCode),
+                await result.Content.ReadFromJsonAsync<TokenResponse>(cancellationToken) ?? throw new ExtendedHttpRequestException(Translations.INVALID_OR_UNEXPECTED_RESPONSE, null, result.StatusCode),
                 _timeprovider.GetUtcNow()
             );
         }
         catch (HttpRequestException ex)
         {
-            var err = await result.Content.ReadFromJsonAsync<ErrorResponse>(cancellationToken) ?? throw new HttpRequestException(Translations.INVALID_OR_UNEXPECTED_RESPONSE, null, result.StatusCode);
-            throw new HttpRequestException($"[{err.Error}] {err.Description}", ex, result.StatusCode);
+            var err = await result.Content.ReadFromJsonAsync<ErrorResponse>(cancellationToken) ?? throw new ExtendedHttpRequestException(Translations.INVALID_OR_UNEXPECTED_RESPONSE, null, result.StatusCode);
+            throw new ExtendedHttpRequestException($"[{err.Error}] {err.Description}", ex, result.StatusCode);
         }
     }
 
@@ -76,7 +76,7 @@ private async Task<Token> RefreshTokenAsync(Token token, CancellationToken cance
                 return await RetrieveTokenAsync(GrantTypes.Refresh, cancellationToken);
             }
         }
-        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.BadRequest or HttpStatusCode.Unauthorized) { }
+        catch (ExtendedHttpRequestException ex) when (ex.StatusCode is HttpStatusCode.BadRequest or HttpStatusCode.Unauthorized) { }
         // Refresh token expired or refresh failed? Try to get a new token
         return await RetrieveTokenAsync(GetGrantType(), cancellationToken).ConfigureAwait(false);
     }
@@ -99,4 +99,9 @@ private record ErrorResponse
         [property: JsonPropertyName("error")] string Error,
         [property: JsonPropertyName("error_description")] string Description
     );
-}
+
+    private class ExtendedHttpRequestException(string message, Exception? innerException, HttpStatusCode httpStatusCode) : HttpRequestException(message, innerException)
+    {
+        public HttpStatusCode StatusCode { get; private set; } = httpStatusCode;
+    }
+}