I have an action in my ASP.NET Core application that needs to manually load the request body as a stream using HttpContext.Request.Body
. In this case, I cannot use a DTO as a request parameter. However, I would still like to declare a custom type for OpenAPI annotations and documentation purposes, even though the DTO won't be used to handle the request body.
Here is the current code snippet:
[HttpPost]
[Route("api/upload")]
[Consumes("multipart/form-data")]
[ProducesResponseType(StatusCodes.Status204NoContent)]
public async Task<IActionResult> UploadDataAsync()
{
// Use the HttpContext.Request.Body to read the body manually
return NoContent();
}
I need to declare a custom type as my request payload. Something like this:
[HttpPost]
[Route("api/upload")]
[Consumes("multipart/form-data")]
[ProducesResponseType(StatusCodes.Status204NoContent)]
[SwaggerRequestBody(typeof(SomeDTO))] /* Something like this attribute! */
public async Task<IActionResult> UploadDataAsync()
{
// Use the HttpContext.Request.Body to read the body manually
return NoContent();
}
Please note that the DTO is only used for specifying the OpenAPI annotations and is not actually used in the request processing.
Is there a way to achieve this without using the DTO as a request parameter? I want to ensure accurate API documentation while still manually handling the request body using HttpContext.Request.Body
. I'm aware that I can implement a custom IOperationFilter
, but this would require manually creating the schema with all of the properties. I'm looking for a simpler approach that avoids the need to create the schema myself.
Here the idea how you can use IOperationFilter
to define your own contract for body:
public sealed class AnyBodyFilter<T> : IOperationFilter
{
public void Apply(OpenApiOperation operation, OperationFilterContext context)
{
var schema = context.SchemaGenerator.GenerateSchema(typeof(T), context.SchemaRepository);
operation.RequestBody = new OpenApiRequestBody
{
Content =
{
["multipart/form-data"] = new OpenApiMediaType
{
Schema = schema,
}
}
};
}
}
Then decorate your action with attribute [SwaggerOperationFilter(typeof(AnyBodyFilter<SomeDTO>))]
and it's should be done.