w2p-85140 ds-rss component now adds a button to all search pages and community and collection, link-head service adds the rss to the head element

src/app/shared/rss-feed/rss.component.ts

@@ -0,0 +1,94 @@
+import {
+  ChangeDetectionStrategy,
+  Component,
+  OnDestroy,
+  OnInit,
+  ViewEncapsulation
+} from '@angular/core';
+import { BehaviorSubject, Observable } from 'rxjs';
+import { GroupDataService } from '../../core/eperson/group-data.service';
+import { LinkHeadService } from '../../core/services/link-head.service';
+import { ConfigurationDataService } from '../../core/data/configuration-data.service';
+import { getFirstCompletedRemoteData } from '../../core/shared/operators';
+import { environment } from '../../../../src/environments/environment';
+import { SearchConfigurationService } from '../../core/shared/search/search-configuration.service';
+import { SortOptions } from '../../core/cache/models/sort-options.model';
+import { PaginationService } from '../../core/pagination/pagination.service';
+
+
+/**
+ * The default pagination controls component.
+ */
+@Component({
+  exportAs: 'rssComponent',
+  selector: 'ds-rss',
+  styleUrls: ['rss.component.scss'],
+  templateUrl: 'rss.component.html',
+  changeDetection: ChangeDetectionStrategy.Default,
+  encapsulation: ViewEncapsulation.Emulated
+})
+export class RSSComponent implements OnInit, OnDestroy  {
+
+  route$: BehaviorSubject<string>;
+
+  isEnabled$: BehaviorSubject<boolean> = new BehaviorSubject<boolean>(false);
+
+  uuid: string;
+  configuration$: Observable<string>;
+  sortOption$: Observable<SortOptions>;
+
+  constructor(private groupDataService: GroupDataService,
+              private linkHeadService: LinkHeadService,
+              private configurationService: ConfigurationDataService,
+              private searchConfigurationService: SearchConfigurationService,
+              protected paginationService: PaginationService) {
+  }
+  ngOnDestroy(): void {
+    this.linkHeadService.removeTag("rel='alternate'");
+  }
+
+  ngOnInit(): void {
+    this.configuration$ = this.searchConfigurationService.getCurrentConfiguration('default');
+
+    this.configurationService.findByPropertyName('websvc.opensearch.enable').pipe(
+      getFirstCompletedRemoteData(),
+    ).subscribe((result) => {
+      const enabled = Boolean(result.payload.values[0]);
+      this.isEnabled$.next(enabled);
+    });
+
+    this.searchConfigurationService.getCurrentQuery('').subscribe((query) => {
+      this.sortOption$ = this.paginationService.getCurrentSort(this.searchConfigurationService.paginationID, null, true);
+      this.sortOption$.subscribe((sort) => {
+        this.uuid = this.groupDataService.getUUIDFromString(window.location.href);
+
+        const route = environment.rest.baseUrl + this.formulateRoute(this.uuid, sort, query);
+
+        this.linkHeadService.addTag({
+          href: route,
+          type: 'application/atom+xml',
+          rel: 'alternate',
+          title: 'Sitewide Atom feed'
+        });
+        this.route$ = new BehaviorSubject<string>(route);
+      });
+    });
+  }
+
+  formulateRoute(uuid: string, sort: SortOptions, query: string): string {
+    let route = 'search?format=atom';
+    if (uuid) {
+      route += `&scope=${uuid}`;
+    }
+    if (sort.direction && sort.field) {
+      route += `&sort=${sort.field}&sort_direction=${sort.direction}`;
+    }
+    if (query) {
+      route += `&query=${query}`;
+    } else {
+      route += `&query=*`;
+    }
+    route = '/opensearch/' + route;
+    return route;
+  }
+}