convert soft 404s to hard 404s in unfurler ssr

frontend/src/app/services/seo.service.ts

@@ -1,5 +1,7 @@
 import { Injectable } from '@angular/core';
 import { Title, Meta } from '@angular/platform-browser';
+import { ActivatedRoute, NavigationEnd, Router } from '@angular/router';
+import { filter, map, switchMap } from 'rxjs';
 import { StateService } from './state.service';
 
 @Injectable({
@@ -13,8 +15,22 @@ export class SeoService {
     private titleService: Title,
     private metaService: Meta,
     private stateService: StateService,
+    private router: Router,
+    private activatedRoute: ActivatedRoute,
   ) {
     this.stateService.networkChanged$.subscribe((network) => this.network = network);
+    this.router.events.pipe(
+      filter(event => event instanceof NavigationEnd),
+      map(() => this.activatedRoute),
+      map(route => {
+        while (route.firstChild) route = route.firstChild;
+        return route;
+      }),
+      filter(route => route.outlet === 'primary'),
+      switchMap(route => route.data),
+    ).subscribe((data) => {
+      this.clearSoft404();
+    });
   }
 
   setTitle(newTitle: string): void {
@@ -53,4 +69,14 @@ export class SeoService {
   ucfirst(str: string) {
     return str.charAt(0).toUpperCase() + str.slice(1);
   }
+
+  clearSoft404() {
+    window['soft404'] = false;
+    console.log('cleared soft 404');
+  }
+
+  logSoft404() {
+    window['soft404'] = true;
+    console.log('set soft 404');
+  }
 }