Read JSON post data in ASP.Net Core MVC

Question

I've tried to find a solution for this, but all the ones coming up are for previous versions of ASP.Net.

I'm working with the JWT authentication middleware and have the following method:

private async Task GenerateToken(HttpContext context)
{
    var username = context.Request.Form["username"];
    var password = context.Request.Form["password"];
    //Remainder of login code
}

This gets the sent data as if it was form data, but my Angular 2 front end is sending the data as JSON.

login(username: string, password: string): Observable<boolean> {
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });
    let body = JSON.stringify({ username: username, password: password });
        return this.http.post(this._api.apiUrl + 'token', body, options)
            .map((response: Response) => {
                
            });
    }

My preferred solution is to send it as JSON, but I've been unsuccessful in retrieving the data. I know it's sending, because I can see it in fiddler, and if I use Postman and just send form data it works fine.

Basically I just need to figure out how to change this line to read the json data

var username = context.Request.Form["username"];

Answer 1

By the time it gets to your middleware the request stream has already been read, so what you can do here is Microsoft.AspNetCore.Http.Internal.EnableRewind on the Request and read it yourself

Site wide :

Startup.cs
using Microsoft.AspNetCore.Http.Internal;

Startup.Configure(...){
...
//Its important the rewind us added before UseMvc
app.Use(next => context => { context.Request.EnableRewind(); return next(context); });
app.UseMvc()
...
}

OR selective :

private async Task GenerateToken(HttpContext context)
    {
     context.Request.EnableRewind();
     string jsonData = new StreamReader(context.Request.Body).ReadToEnd();
    ...
    }