cover parameters in decorator created with createParamDecorator

[dragoscirjan]

I'm submitting a...

[ ] Regression 
[ ] Bug report
[x ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Hi guys,

I have the following case:

const ParamsFromHeaders = createParamDecorator((data: unknown, ctx: ExecutionContext) => {
  const request = ctx.switchToHttp().getRequest<Request>();
  return {
    param1: request.headers['nonce'],
    param2: request.headers['uid'],
  };
});

export class ParamsFromHeadersDto {
  @ApiProperty({...})
  param1: string;

  @ApiProperty({...})
  param2: string;
}

@Controller('/path')
export class Controller {
  @Get('/subpath')
  async workWithHeaders(
    @ParamsFromHeaders () headers: ParamsFromHeadersDto
  ): Promise<void> {
    // ...
  }
}

Current behavior

So far, from what I've read, swagger does not support a custom param decorator so the described properties will not be indexed.

If, instead @FaramsFromHeaders() headers: ... I would use @Headers() headers: ... the properties would be indexed and documented.

Expected behavior

There should be a way to add the custom decorators that swagger will "look into" and index those properties.

If there is a way already, please let me know, if not, could we implement one?

[kamilmysliwiec]

Duplicate #32