AspNetCore: Hide swagger from nonauthorized users

[spixy]

Hi, I use Nswag in my company and I want to allow access to swagger only with login
(it is private API so other users out of company should not have access).
Is that possible?

Currently I use NSwag.AspNetCore nuget.
(Related: domaindrivendev/Swashbuckle.WebApi#601)

[RicoSuter]

This feature is not built-in and is probably handled best with an own middleware or proxy in front of the web app

[jeremyVignelles]

I just had this isse, asked Rico, which redirected me here.

I implemented the middleware as sad before, in an extension class:

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Builder;
using System;

/// <summary>
/// The extension methods that extends <see cref="IApplicationBuilder" /> for authentication purposes
/// </summary>
public static class ApplicationBuilderExtensions
{
    /// <summary>
    /// Requires authentication for paths that starts with <paramref name="pathPrefix" />
    /// </summary>
    /// <param name="app">The application builder</param>
    /// <param name="pathPrefix">The path prefix</param>
    /// <returns>The application builder</returns>
    public static IApplicationBuilder RequireAuthenticationOn(this IApplicationBuilder app, string pathPrefix)
    {
        return app.Use((context, next) =>
        {
            // First check if the current path is the swagger path
            if (context.Request.Path.HasValue && context.Request.Path.Value.StartsWith(pathPrefix, StringComparison.InvariantCultureIgnoreCase))
            {
                // Secondly check if the current user is authenticated
                if (!context.User.Identity.IsAuthenticated)
                {
                    return context.ChallengeAsync();
                }
            }

            return next();
        });
    }
}

This will redirect the user to the login page if you have properly set up the authentication mecanism.

Then, when building your app

app.RequireAuthenticationOn("/swagger");
//Enable Swagger + Swagger Ui
app.UseSwaggerUi3WithApiExplorer(this.ConfigureSwagger);