Set data protection application discriminators

This prevents cookie confusion when applications are hosted at the same domain and path. For example, under default settings, WebMVC may attempt to decrypt Identity's antiforgery cookie rather than its own.

src/Services/Identity/Identity.API/Startup.cs

@@ -54,6 +54,11 @@ namespace eShopOnContainers.Identity
 
             services.Configure<AppSettings>(Configuration);
 
+            services.AddDataProtection(opts =>
+            {
+                opts.ApplicationDiscriminator = "eshop.identity";
+            });
+
             services.AddMvc();
 
             services.AddTransient<IEmailSender, AuthMessageSender>();

src/Web/WebMVC/Startup.cs

@@ -42,6 +42,11 @@ namespace Microsoft.eShopOnContainers.WebMVC
         // This method gets called by the runtime. Use this method to add services to the container.
         public void ConfigureServices(IServiceCollection services)
         {
+            services.AddDataProtection(opts =>
+            {
+                opts.ApplicationDiscriminator = "eshop.webmvc";
+            });
+
             services.AddMvc();
             services.Configure<AppSettings>(Configuration);
             

src/Web/WebSPA/Startup.cs

@@ -41,6 +41,11 @@ namespace eShopConContainers.WebSPA
         {
             services.Configure<AppSettings>(Configuration);
 
+            services.AddDataProtection(opts =>
+            {
+                opts.ApplicationDiscriminator = "eshop.webspa";
+            });
+
             services.AddAntiforgery(options => options.HeaderName = "X-XSRF-TOKEN");
 
             services.AddMvc()