Provide a simple built-in way to change the file extension used for .NET assemblies in Blazor WebAssembly apps

[danroth27]

We documented how you can script changing the file extension used for .NET assemblies in a Blazor WebAssembly app. But it would be nice to have a simple built-in way to do this.

Suggestion from @stavroskasidis:

Hopefully one day this could all be handled by the framework with a flag in the csproj, e.g.

<BlazorBinariesExtension>.bin</BlazorBinariesExtension>

[mihaimyh]

From what I can see the rename from .dll to .bin must be done also in wwwroot/service-worker-assets.js and remove or re-compress wwwroot/service-worker-assets.js.br and wwwroot/service-worker-assets.js.gz, otherwise there are integrity issues in browser's console.

[danroth27]

From what I can see the rename from .dll to .bin must be done also in wwwroot/service-worker-assets.js and remove or re-compress wwwroot/service-worker-assets.js.br and wwwroot/service-worker-assets.js.gz, otherwise there are integrity issues in browser's console.

@guardrex @SteveSandersonMS Do you need to update the docs on this to account for this?

[guardrex]

The current doc does NOT address service-worker-assets.js; so if that's an issue, we'll need the doc to reflect it.

After I hear back that it should be called out, I'll open an doc issue to address it. 👂

[SteveSandersonMS]

Yes, the same filename replacements would need to be made in the service worker assets manifest too.

[darcythomas]

I wonder if there is a risk some AV scanners may inspect files looking for dll magic strings.?! So it would be nice if there were some way of obfuscating the files. Say by a simple XOR encryption with a random key that is included in the blazor.boot.json Or if you want to be fancy using CryptoJS.AES

Thoughts?

[smartprogrammer93]

I believe this should get more love since dotnet/AspNetCore.Docs#18551
and cases like #21996 might happen more often with dll file ending

[guardrex]

@smartprogrammer93 asked about guidance for compression. Today, we just say that it's up to the dev to deal with recompressing blazor.boot.json. Should I seek to expand the doc scripts to handle compression? I'd rather not if the framework is going to get something built in. I'm 🏃 on a lot of high priority work for the next few months.

[pranavkm]

@javiercn I imagine your work to enable custom deployments - https://devblogs.microsoft.com/aspnet/custom-deployment-layout-for-blazor-webassembly-apps/ - tackles this issue. Do you think there's any additional work to be done here?

[javiercn]

@pranavkm yes.

[SteveSandersonMS]

@pranavkm That'll teach you to ask more than one question. Loving the ambiguity :)