CODEWITHSUNDEEP
asp.net.netasp.net-core
realPro
realPro

Reputation: 1846

How to validate request before file upload using ASP.NET Core

I have this code that uploads a file. My problem is that AuthorizationCheck fires only after the file is uploaded. If the file is larger than 20MB the AuthorizationCheck will not fire at all and the request will return 404. Is it possible to validate the request headers before the file steam is sent? If the request is not authorized then the file should be blocked from uploading to the server. Also it is not clear why when I upload a large file it is being uploaded fully and only then 404 is being returned...

            [RequestSizeLimit(21_000_000)]
            [Authorize(Policy = "AuthorizationCheck")]
            public async Task<IActionResult> Upload(IFormFile file)
            {
    
                using (var stream = file.OpenReadStream())
                {
                    await StoreFileAsync(stream);
                }
             }

Upvotes: 3

Views: 562

Answers (1)

mj1313
mj1313

Reputation: 8459

[RequestSizeLimit(21_000_000)] limit your resquest can't exceed 20MB, you may use [DisableRequestSizeLimit] instead.

In addition, there's also a limit that's imposed by IIS, which is 30MB by default. When this size limit is exceeded, IIS itself generates a 404 response. To change the limit of IIS, you should custom a Web.configure.

For more details, you can refer to this answer.

Updata

You can access the request headers in a custom middleware :

app.Use(async (context, next) =>
{
    var header = context.Request.Headers["XXX"];

    //do something
    
    await next();
});

Upvotes: 1

Related Questions