feat: add "no server side rendering" guard to protect routes that sho…

…uld not be rendered in SSR (#1277)

* used for all checkout pages that should only be rendered in the users browser

src/app/core/guards/no-server-side-rendering.guard.ts

@@ -0,0 +1,20 @@
+import { Injectable } from '@angular/core';
+import { CanActivate, Router } from '@angular/router';
+
+/**
+ * guards a route against server side rendering (e.g. if the logic requires information only available in browser rendering)
+ */
+@Injectable({ providedIn: 'root' })
+export class NoServerSideRenderingGuard implements CanActivate {
+  constructor(private router: Router) {}
+
+  canActivate() {
+    // prevent any handling in the server side rendering (SSR) and instead show loading
+    if (SSR) {
+      return this.router.parseUrl('/loading');
+    }
+
+    // if not in SSR just return true and continue
+    return true;
+  }
+}

src/app/pages/checkout/checkout-page.module.ts

@@ -1,6 +1,7 @@
 import { NgModule } from '@angular/core';
 import { RouterModule, Routes } from '@angular/router';
 
+import { NoServerSideRenderingGuard } from 'ish-core/guards/no-server-side-rendering.guard';
 import { SharedModule } from 'ish-shared/shared.module';
 
 import { CheckoutAddressPageModule } from '../checkout-address/checkout-address-page.module';
@@ -16,6 +17,7 @@ import { CheckoutProgressBarComponent } from './checkout-progress-bar/checkout-p
 const checkoutPageRoutes: Routes = [
   {
     path: '',
+    canActivate: [NoServerSideRenderingGuard],
     component: CheckoutPageComponent,
     children: [
       {