Program.cs

using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.OpenIdConnect;
using Microsoft.IdentityModel.JsonWebTokens;
using Microsoft.IdentityModel.Tokens;
using Microsoft.AspNetCore.Authentication.Google;
using Microsoft.AspNetCore.Authentication.OAuth;
using static System.Net.WebRequestMethods;

var builder = WebApplication.CreateBuilder(args);

builder.Logging.ClearProviders();
builder.Logging.AddConsole();

builder.Services.AddControllersWithViews();
JsonWebTokenHandler.DefaultInboundClaimTypeMap.Clear();
builder.Services.AddHttpClient("ApiClient", client =>
{
    client.BaseAddress = new Uri(builder.Configuration["Api:BaseAddress"]);
});

builder.Services.AddAuthentication(options =>
{
    options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
}).AddCookie(CookieAuthenticationDefaults.AuthenticationScheme, options =>
{
    options.LoginPath = "/Account/Login";
    options.AccessDeniedPath = "/Authentication/AccessDenied";
})
.AddOpenIdConnect(OpenIdConnectDefaults.AuthenticationScheme, options =>
{
    options.Authority = builder.Configuration["Authentication:OpenId:Authority"];
    options.ClientId = builder.Configuration["Authentication:OpenId:ClientId"];
    options.ClientSecret = builder.Configuration["Authentication:OpenId:ClientSecret"];
    options.ResponseType = "code";
    options.SaveTokens = true;
    options.RequireHttpsMetadata = bool.Parse(builder.Configuration["Authentication:OpenId:Metadata"]);
    if (options.RequireHttpsMetadata)
    {
        options.MetadataAddress = builder.Configuration["Authentication:OpenId:MetaAddress"];
    }
    options.Scope.Add("openid");
    options.CallbackPath = "/login-callback";
    options.SignedOutCallbackPath = "/logout-callback";
    options.TokenValidationParameters = new TokenValidationParameters
    {
        NameClaimType = "preferred_username",
        RoleClaimType = "roles"
    };
})
.AddGoogle(GoogleDefaults.AuthenticationScheme, options =>
{
    options.ClientId = builder.Configuration["Authentication:Google:ClientId"];
    options.ClientSecret = builder.Configuration["Authentication:Google:ClientSecret"];
    options.CallbackPath = "/login-callback";
});

var app = builder.Build();

if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}


//app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthentication();
app.UseAuthorization();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

app.Run();