Get tenant routes to filter from SPA fallback

[xperiandri]

We are trying to run Blazor from Orchard Core theme.
It launches but UseBlazor middleware handles all requests and does not allow to access admin or tenants:

https://github.com/aspnet/Blazor/blob/39d2b90f03b037cf4601a056b37ab55fad9daab6/src/Microsoft.AspNetCore.Blazor.Server/Builder/BlazorApplicationBuilderExtensions.cs#L96

https://github.com/aspnet/Blazor/blob/39d2b90f03b037cf4601a056b37ab55fad9daab6/src/Microsoft.AspNetCore.Blazor.Server/Builder/BlazorApplicationBuilderExtensions.cs#L158

How to get a list of tenant routes, theme route and admin route to filter them from SPA fallback?

[sebastienros]

@jtkech Can you take a look?

Maybe we need to add some functional tests that will try to access these from the Demo module.

[jtkech]

Okay, i will take a look.

I don't know well Blazor, where do you call UseBlazor()? If it is through the Configure() of a module / theme startup, maybe you just need to override and then set the startup Order property to a value > 0 so that the MapWhenMiddleware is run later, but need to be tried.

After a quick look at the above links, i saw static file middlewares which use physical files providers. So, i'm afraid that it would need more adaptations because our modules / themes embed their static files in their assemblies and there are served through custom file providers.

I remember we did a recent change allowing to add Mappings files to the module static files we serve, because somebody wanted to add e.g .wasm files, maybe he was trying to do the same thing.

[xperiandri]

My colleague will upload a reproduction here (branch blazor-conference) around half of the hour.
We call UseBlazor() within the module's startup. And it just handles all the requests.

I remember we did a recent change allowing to add Mappings files to the module static files we serve, because somebody wanted to add e.g .wasm files, maybe he was trying to do the same thing.

It was me. But we moved to Blazor due to Ooui.Forms lack of necessary features.
But I'm going to evolve both options.

[sebastienros]

Sorry, Blazor, I read Razor Pages ;)

[xperiandri]

I've updated the link

[xperiandri]

@jtkech, have you tried my reproduction?

[jtkech]

@xperiandri sorry not yet, i will do it soon.

[sebastienros]

Don';t spend too much time on this, Blazor is super not stable, so I don't want any dependency on it in OC. It's fine to know if it works or not, and if so how to make it work, but we should not try to support it yet. You can already create a side project that would use Blazor to query content from OC, like their Server/Client sample.

[jtkech]

Okay, no problem, i just did little tests.

• I first needed to remove any reference on blazor packages to be able to run the setup with your conference recipe.

• Then i got an SPA default page middleware exception. Maybe i missed something but your main issue being related to routes, i only focused on this.

• Indeed, when i remove your path checking then i can't access e.g /admin.

So, a quick workaround, which could give you some ideas and which seems to work, is to do something like this in your theme startup.

    // So that it is run last
    public override int Order => 100;

    ....

    public override void Configure(IApplicationBuilder app, ...)
    {
        ...
        app.UseWhen(
            ctx => ctx.Response.StatusCode == StatusCodes.Status404NotFound,
            builder => builder.UseBlazor<RoadShow.Program>());
    }

Doing this i got the same SPA error on the home page (meaning the spa middleware run as before) but i could go e.g to /admin.

[sebastienros]

I asked around and it seems that mixing Blazor and an MVC app doesn't work, so it would not work with Orchard either. The current samples expose two different apps for this. Let's follow what they have to say on the issue you created in the blazor repos.

[jtkech]

@xperiandri have you tried my workaround to filter routes from SPA fallback?

[xperiandri]

Yes, it works. Thanks.
Blazor causes an issue now.