chore(GraphQl): Add application user (#662)

Hard coded IUser set to LocalDevelopmentUser

## Related Issue(s)

- #490 

## Verification

- [x] **Your** code builds clean without any errors or warnings
- [ ] Manual testing done (required)
- [ ] Relevant automated test added (if you find this hard, leave it and
we'll help out)

## Documentation

- [ ] Documentation is updated (either in `docs`-directory, Altinnpedia
or a separate linked PR in
[altinn-studio-docs.](https://github.com/Altinn/altinn-studio-docs), if
applicable)

Author: oskogstad

src/Digdir.Domain.Dialogporten.GraphQL/Common/ApplicationUser.cs

@@ -0,0 +1,19 @@
+using System.Security.Claims;
+using Digdir.Domain.Dialogporten.Application.Externals.Presentation;
+
+namespace Digdir.Domain.Dialogporten.GraphQL.Common;
+
+internal sealed class ApplicationUser : IUser
+{
+    private readonly IHttpContextAccessor _httpContextAccessor;
+
+    public ApplicationUser(IHttpContextAccessor httpContextAccessor)
+    {
+        _httpContextAccessor = httpContextAccessor ?? throw new ArgumentNullException(nameof(httpContextAccessor));
+    }
+
+    public ClaimsPrincipal GetPrincipal()
+    {
+        return _httpContextAccessor.HttpContext?.User ?? throw new InvalidOperationException("No user principal found");
+    }
+}

src/Digdir.Domain.Dialogporten.GraphQL/Common/Authentication/AuthenticationBuilderExtensions.cs

@@ -12,9 +12,9 @@ public static IServiceCollection AddDialogportenAuthentication(
     {
         var jwtTokenSchemas = configuration
             .GetSection(GraphQlSettings.SectionName)
-            .Get<GraphQlSettings>()
-            ?.Authentication
-            ?.JwtBearerTokenSchemas;
+            .Get<GraphQlSettings>()?
+            .Authentication?
+            .JwtBearerTokenSchemas;
 
         if (jwtTokenSchemas is null || jwtTokenSchemas.Count == 0)
             // Validation should have caught this.

src/Digdir.Domain.Dialogporten.GraphQL/Program.cs

@@ -82,7 +82,7 @@ static void BuildAndRun(string[] args)
         .AddInfrastructure(builder.Configuration, builder.Environment)
         .AddAutoMapper(Assembly.GetExecutingAssembly())
         .AddApplicationInsightsTelemetry()
-        .AddScoped<IUser, LocalDevelopmentUser>()
+        .AddScoped<IUser, ApplicationUser>()
         .AddValidatorsFromAssembly(thisAssembly, ServiceLifetime.Transient, includeInternalTypes: true)
         .AddAzureAppConfiguration()