"camelCase" formatting seems to cause problems with "Office for the web" as client

[planax]

https://github.com/petrsvihlik/WopiHost/blob/842e6ff132716afc087a16f1e215ec74c93fae46/WopiHost.Core/Controllers/FilesController.cs#L78

For me, when using .NET 5/Core 3.1, the response will contain JSON key names formatted in camelCase. This seems to be the new default.

{
  "baseFileName": "TestDocument.docx",
  "ownerId": "uid-12345-6789",
  "size": 1234567,
  "userId": "uid-12345-6789",
  "version": "1234567"
}

This wouldn't be per se a problem, but when using Office for the web as Wopi Client, no GetFile will be sent back. After quite some time reading the MS-WOPI protocol specification, part 3.3.5.1.2.2, I realized that this was the reason.

I fixed the issue by forcing PascalCase, which seems to be what MS-WOPI expects.

Before: https://github.com/petrsvihlik/WopiHost/blob/842e6ff132716afc087a16f1e215ec74c93fae46/WopiHost/Startup.cs#L44

After:

services.AddControllers()
  .AddNewtonsoftJson(options =>
  {
      options.SerializerSettings.ContractResolver = new DefaultContractResolver();
  });

Response:

{
  "BaseFileName": "TestDocument.docx",
  "OwnerId": "uid-12345-6789",
  "Size": 1234567,
  "UserId": "uid-12345-6789",
  "Version": "1234567"
}

[petrsvihlik]

Thank you for reporting this @planax , I'll try to reproduce it next week and let you know!

[planax]

@petrsvihlik, this can be closed. It was actually my fault. I didn't notice you were specifying PascalCase formatting in WopiCoreBuilderExtensions class.