add google authentication to Existing .net core 2 web api project

Question

TL;DR - how to add authentication to an existing default core 2 web api project that was started without auth.

Details - I've got an existing .net core 2 web api project with no authentication configured and I'm using entity framework core.

It was opened like -

PIC 1 - No Auth Selected

I'd like to add Google authentication to my existing project as if it were opened with

PIC 2 - Individual user accounts selected

but I can't find any resource regarding adding those capabilities + scaffolding and migrations - all I can find are links regarding upgrading from core v1 to 2.

any ideas?

thanks!

Sorry, I don't follow. Upgrading what? The google linked shows you how to add Google Auth to an asp.net core app. Can you try updating your question? Regards. — spottedmahn
– spottedmahn, Commented Oct 12, 2017 at 19:42
hey ! thank you ! updated - hope its clearer. Basically I started out with the default template ( without authentication) and now I'd like to add google auth to my project without having to copy out all my work to a new one .. — JanivZ
– JanivZ, Commented Oct 12, 2017 at 20:22
Did you ever figure this out? I'm really struggling to get mine working and so many example use the MVC template, I just want the API. — nicV
– nicV, Commented Nov 19, 2017 at 8:19
No! I did not! Any advice you have or suggestions how to edit the question... — JanivZ
– JanivZ, Commented Nov 19, 2017 at 9:15
I found the following blog post when trying to do the same thing: jonhilton.net/2017/05/10/… — Jonny
– Jonny, Commented Mar 15, 2018 at 10:59

Murray · Accepted Answer · 2017-12-16 19:57:39Z

Add packages

Microsoft.AspNetCore.Identity
Microsoft.AspNetCore.Identity.EntityFrameworkCore
Microsoft.AspNetCore.Authentication.Google

Then in Startup:

public void ConfigureServices(IServiceCollection services)
{
    services.AddIdentity<IdentityUser, IdentityRole>();
    services.AddAuthentication(
            v => {
                v.DefaultAuthenticateScheme = GoogleDefaults.AuthenticationScheme;
                v.DefaultChallengeScheme = GoogleDefaults.AuthenticationScheme;
            }).AddGoogle(googleOptions =>
            {
                googleOptions.ClientId = "CLIENT ID";
                googleOptions.ClientSecret = "CLIENT SECRET";
            });
    services.AddMvc();
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseAuthentication()
       .UseMvc();
}

A minimal working example here: https://github.com/mjrmua/Asp.net-Core-2.0-google-authentication-example

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