Read B2C Token from Razor MVC Application

 To Retrieve B2C logged in users token for delegate permissions, follow below steps,

Add below lines in startup,

// Configuration to sign-in users with Azure AD B2C

   services.AddMicrosoftIdentityWebAppAuthentication(Configuration, Constants.AzureAdB2C).

        EnableTokenAcquisitionToCallDownstreamApi(new string[] { "https://graph.microsoft.com/.default" })

       .AddInMemoryTokenCaches();

services.Configure<OpenIdConnectOptions>(OpenIdConnectDefaults.AuthenticationScheme, options =>

{

    options.TokenValidationParameters = new TokenValidationParameters

    {

        ValidAudience = "https://graph.microsoft.com"

    };

    options.SaveTokens = true;

});

 

services.Configure<ConfidentialClientApplicationOptions>(options =>

{

    options.ClientSecret = Configuration["AzureAdB2C:ClientSecret"];

});

 

services.ConfigureApplicationCookie(options =>

{

    options.Cookie.SameSite = SameSiteMode.None;

    options.Cookie.SecurePolicy = CookieSecurePolicy.Always;

});

 

Now retrieve token from Controller with below syntax,

    HttpContext.GetTokenAsync("access_token").Result

    or

    HttpContext.GetTokenAsync("id_token").Result