Incorrect schema generation for IFormFile parameters in Minimal API projects when using WithOpenApi extension method #2625
Description
I'm using .NET 7.0.4 and Swashbuckle.AspNetCore 6.5.0.
Consider the following endpoints:
app.MapPost("/api/upload", (IFormFile file) =>
{
return TypedResults.Ok(file.FileName);
});
app.MapPost("/api/upload_with_openapi", (IFormFile file) =>
{
return TypedResults.Ok(file.FileName);
})
.WithOpenApi();
The first one generates the following schema:
schema": {
"required": [
"file"
],
"type": "object",
"properties": {
"file": {
"type": "string",
"format": "binary"
}
}
},
While the second, using WithOpenApi, produces this:
"schema": {
"type": "string",
"format": "binary"
},
This causes an exception when calling the /api/upload_with_openapi endpoint:
Microsoft.AspNetCore.Http.BadHttpRequestException: Required parameter "IFormFile file" was not provided from form file.
at lambda_method3(Closure, Object, HttpContext, Object)
at Microsoft.AspNetCore.Http.RequestDelegateFactory.<>c__DisplayClass92_2.<<HandleRequestBodyAndCompileRequestDelegateForForm>b__2>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)
You can find a minimal repro here: https://github.com/marcominerva/FileUploadIssue
Original issue posted at dotnet/aspnetcore#47526