WithReference to project and host.docker.internal

[dashkan]

I am writing a hosting provider for oauth2-proxy. I want to proxy projects and other http/s resources via oauth2-proxy upstreams. When I reference a project using .WithReference, the env var for the service is added to my project, and when I viewed in the dashboard, the value is what I am looking for (e.g services__apiservice__http__0: http://host.docker.internal:5455).

I have the below extension method to add the upstream project where I pass in the project builder and the endpoint name. I AddReference to the project and AddEnvironment with a callback. But the value for services__apiservice__http__0 is http://localhost:5455. Is there a non-hacky way to get the resolved hostname (host.docker.internal) in my scenario?

My ultimate goal is to the the OAUTH2_PROXY_UPSTREAMS environment value with http://host.docker.internal:5455. Not http://localhost:5455.

    public static IResourceBuilder<OAuth2ProxyResource> WithUpstreamProject(
        this IResourceBuilder<OAuth2ProxyResource> builder,
        IResourceBuilder<ProjectResource> project,
        string endpointName = "http",
        string path = "/")
    {
        builder.WithReference(project)
            .WithEnvironment(context =>
            {
                var envVar = context.EnvironmentVariables[$"services__{project.Resource.Name}__{endpointName}__0"] as EndpointReference;
                return Task.CompletedTask;
            })
            .WaitFor(project);

        return builder;
    }

Thanks in advance.

[dashkan]

Never mind. I figured it out.

    public static IResourceBuilder<OAuth2ProxyResource> WithUpstreamProject(
        this IResourceBuilder<OAuth2ProxyResource> builder,
        IResourceBuilder<ProjectResource> project,
        string endpointName = "http",
        string path = "/")
    {
        builder.WithReference(project)
            .WithEnvironment(context =>
            {
                if (context.EnvironmentVariables.GetValueOrDefault("OAUTH2_PROXY_UPSTREAMS") is ReferenceExpression oauth2ProxyUpstreams)
                {
                    context.EnvironmentVariables["OAUTH2_PROXY_UPSTREAMS"] = ReferenceExpression.Create($"{oauth2ProxyUpstreams},{project.Resource.GetEndpoint(endpointName)}{path}");
                }
                else
                {
                    context.EnvironmentVariables["OAUTH2_PROXY_UPSTREAMS"] = ReferenceExpression.Create($"{project.Resource.GetEndpoint(endpointName)}{path}");
                }
                return Task.CompletedTask;
            })
            .WaitFor(project);

        return builder;
    }