Use the item's HALLink to get the access status

src/app/core/core.module.ts

@@ -164,6 +164,7 @@ import { CoreState } from './core-state.model';
 import { GroupDataService } from './eperson/group-data.service';
 import { SubmissionAccessesModel } from './config/models/config-submission-accesses.model';
 import { AccessStatusObject } from '../shared/object-list/access-status-badge/access-status.model';
+import { AccessStatusDataService } from './data/access-status-data.service';
 
 /**
  * When not in production, endpoint responses can be mocked for testing purposes
@@ -221,6 +222,7 @@ const PROVIDERS = [
   MyDSpaceResponseParsingService,
   ServerResponseService,
   BrowseService,
+  AccessStatusDataService,
   SubmissionCcLicenseDataService,
   SubmissionCcLicenseUrlDataService,
   SubmissionFormsConfigService,

src/app/core/data/access-status-data.service.ts

@@ -0,0 +1,45 @@
+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+import { Store } from '@ngrx/store';
+import { NotificationsService } from '../../shared/notifications/notifications.service';
+import { dataService } from '../cache/builders/build-decorators';
+import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
+import { ObjectCacheService } from '../cache/object-cache.service';
+import { HALEndpointService } from '../shared/hal-endpoint.service';
+import { DataService } from './data.service';
+import { RequestService } from './request.service';
+import { DefaultChangeAnalyzer } from './default-change-analyzer.service';
+import { CoreState } from '../core-state.model';
+import { AccessStatusObject } from 'src/app/shared/object-list/access-status-badge/access-status.model';
+import { ACCESS_STATUS } from 'src/app/shared/object-list/access-status-badge/access-status.resource-type';
+import { Observable } from 'rxjs';
+import { RemoteData } from './remote-data';
+import { Item } from '../shared/item.model';
+
+@Injectable()
+@dataService(ACCESS_STATUS)
+export class AccessStatusDataService extends DataService<AccessStatusObject> {
+
+  protected linkPath = 'accessStatus';
+
+  constructor(
+    protected comparator: DefaultChangeAnalyzer<AccessStatusObject>,
+    protected halService: HALEndpointService,
+    protected http: HttpClient,
+    protected notificationsService: NotificationsService,
+    protected objectCache: ObjectCacheService,
+    protected rdbService: RemoteDataBuildService,
+    protected requestService: RequestService,
+    protected store: Store<CoreState>,
+  ) {
+    super();
+  }
+
+  /**
+   * Returns {@link RemoteData} of {@link AccessStatusObject} that is the access status of the given item
+   * @param item  Item we want the access status of
+   */
+  findAccessStatusFor(item: Item): Observable<RemoteData<AccessStatusObject>> {
+    return this.findByHref(item._links.accessStatus.href);
+  }
+}

src/app/core/data/item-data.service.ts

@@ -36,7 +36,6 @@ import { sendRequest } from '../shared/request.operators';
 import { RestRequest } from './rest-request.model';
 import { CoreState } from '../core-state.model';
 import { FindListOptions } from './find-list-options.model';
-import { AccessStatusObject } from 'src/app/shared/object-list/access-status-badge/access-status.model';
 
 @Injectable()
 @dataService(ITEM)
@@ -292,33 +291,6 @@ export class ItemDataService extends DataService<Item> {
     );
   }
 
-  /**
-   * Get the endpoint for an item's access status
-   * @param itemId
-   */
-   public getAccessStatusEndpoint(itemId: string): Observable<string> {
-    return this.halService.getEndpoint(this.linkPath).pipe(
-      switchMap((url: string) => this.halService.getEndpoint('accessStatus', `${url}/${itemId}`))
-    );
-  }
-
-  /**
-   * Get the the access status
-   * @param itemId
-   */
-  public getAccessStatus(itemId: string): Observable<RemoteData<AccessStatusObject>> {
-    const hrefObs = this.getAccessStatusEndpoint(itemId);
-
-    hrefObs.pipe(
-      take(1)
-    ).subscribe((href) => {
-      const request = new GetRequest(this.requestService.generateRequestId(), href);
-      this.requestService.send(request);
-    });
-
-    return this.rdbService.buildSingle<AccessStatusObject>(hrefObs);
-  }
-
   /**
    * Invalidate the cache of the item
    * @param itemUUID

src/app/core/shared/item.model.ts

@@ -21,6 +21,8 @@ import { Version } from './version.model';
 import { VERSION } from './version.resource-type';
 import { BITSTREAM } from './bitstream.resource-type';
 import { Bitstream } from './bitstream.model';
+import { ACCESS_STATUS } from 'src/app/shared/object-list/access-status-badge/access-status.resource-type';
+import { AccessStatusObject } from 'src/app/shared/object-list/access-status-badge/access-status.model';
 
 /**
  * Class representing a DSpace Item
@@ -72,6 +74,7 @@ export class Item extends DSpaceObject implements ChildHALResource {
     templateItemOf: HALLink;
     version: HALLink;
     thumbnail: HALLink;
+    accessStatus: HALLink;
     self: HALLink;
   };
 
@@ -110,6 +113,13 @@ export class Item extends DSpaceObject implements ChildHALResource {
   @link(BITSTREAM, false, 'thumbnail')
   thumbnail?: Observable<RemoteData<Bitstream>>;
 
+  /**
+   * The access status for this Item
+   * Will be undefined unless the access status {@link HALLink} has been resolved.
+   */
+   @link(ACCESS_STATUS)
+   accessStatus?: Observable<RemoteData<AccessStatusObject>>;
+
   /**
    * Method that returns as which type of object this object should be rendered
    */

src/app/shared/object-grid/search-result-grid-element/item-search-result/item/item-search-result-grid-element.component.html

@@ -18,7 +18,7 @@
       </span>
       <div class="card-body">
           <ds-type-badge *ngIf="showLabel" [object]="dso"></ds-type-badge>
-          <ds-access-status-badge [uuid]="dso.uuid"></ds-access-status-badge>
+          <ds-access-status-badge [item]="dso"></ds-access-status-badge>
           <ds-truncatable-part [id]="dso.id" [minLines]="3" type="h4">
               <h4 class="card-title" [innerHTML]="firstMetadataValue('dc.title')"></h4>
           </ds-truncatable-part>

src/app/shared/object-list/access-status-badge/access-status-badge.component.ts

@@ -1,11 +1,11 @@
 import { Component, Input } from '@angular/core';
 import { catchError, map } from 'rxjs/operators';
 import { Observable, of as observableOf } from 'rxjs';
-import { getFirstCompletedRemoteData } from 'src/app/core/shared/operators';
-import { ItemDataService } from 'src/app/core/data/item-data.service';
 import { AccessStatusObject } from './access-status.model';
 import { hasValue } from '../../empty.util';
 import { environment } from 'src/environments/environment';
+import { Item } from 'src/app/core/shared/item.model';
+import { AccessStatusDataService } from 'src/app/core/data/access-status-data.service';
 
 @Component({
   selector: 'ds-access-status-badge',
@@ -16,7 +16,7 @@ import { environment } from 'src/environments/environment';
  */
 export class AccessStatusBadgeComponent {
 
-  @Input() uuid: string;
+  @Input() item: Item;
   accessStatus$: Observable<string>;
 
   /**
@@ -27,16 +27,21 @@ export class AccessStatusBadgeComponent {
   /**
    * Initialize instance variables
    *
-   * @param {ItemDataService} itemDataService
+   * @param {AccessStatusDataService} accessStatusDataService
    */
-  constructor(private itemDataService: ItemDataService) { }
+  constructor(private accessStatusDataService: AccessStatusDataService) { }
 
   ngOnInit(): void {
     this.showAccessStatus = environment.item.showAccessStatuses;
-    this.accessStatus$ = this.itemDataService
-      .getAccessStatus(this.uuid)
-      .pipe(
-        getFirstCompletedRemoteData(),
+    if (!this.showAccessStatus || this.item == null) {
+      // Do not show the badge if the feature is inactive or if the item is null.
+      return;
+    }
+    if (this.item.accessStatus == null) {
+      // In case the access status has not been loaded, do it individually.
+      this.item.accessStatus = this.accessStatusDataService.findAccessStatusFor(this.item);
+    } 
+    this.accessStatus$ = this.item.accessStatus.pipe(
       map((accessStatusRD) => {
         if (accessStatusRD.statusCode !== 401 && hasValue(accessStatusRD.payload)) {
           return accessStatusRD.payload;

src/app/shared/object-list/my-dspace-result-list-element/item-list-preview/item-list-preview.component.html

@@ -4,7 +4,7 @@
   </ng-container>
   <div class="d-flex">
     <ds-type-badge [object]="item"></ds-type-badge>
-    <ds-access-status-badge [uuid]="item.uuid" class="pl-1"></ds-access-status-badge>
+    <ds-access-status-badge [item]="item" class="pl-1"></ds-access-status-badge>
   </div>
   <ds-truncatable [id]="item.id">
     <h3 [innerHTML]="item.firstMetadataValue('dc.title') || ('mydspace.results.no-title' | translate)" [ngClass]="{'lead': true,'text-muted': !item.firstMetadataValue('dc.title')}"></h3>

src/app/shared/object-list/search-result-list-element/item-search-result/item-types/item/item-search-result-list-element.component.html

@@ -1,6 +1,6 @@
 <div class="d-flex">
   <ds-type-badge *ngIf="showLabel" [object]="dso"></ds-type-badge>
-  <ds-access-status-badge [uuid]="dso.uuid" class="pl-1"></ds-access-status-badge>
+  <ds-access-status-badge [item]="dso" class="pl-1"></ds-access-status-badge>
 </div>
 
 <ds-truncatable [id]="dso.id" *ngIf="object !== undefined && object !== null">

src/app/shared/search/search.component.ts

@@ -31,6 +31,7 @@ import { ViewMode } from '../../core/shared/view-mode.model';
 import { SelectionConfig } from './search-results/search-results.component';
 import { ListableObject } from '../object-collection/shared/listable-object.model';
 import { CollectionElementLinkType } from '../object-collection/collection-element-link.type';
+import { environment } from 'src/environments/environment';
 
 @Component({
   selector: 'ds-search',
@@ -355,7 +356,8 @@ export class SearchComponent implements OnInit {
       undefined,
       this.useCachedVersionIfAvailable,
       true,
-      followLink<Item>('thumbnail', { isOptional: true })
+      followLink<Item>('thumbnail', { isOptional: true }),
+      followLink<Item>('accessStatus', { isOptional: true, shouldEmbed: environment.item.showAccessStatuses })
     ).pipe(getFirstCompletedRemoteData())
       .subscribe((results: RemoteData<SearchObjects<DSpaceObject>>) => {
         if (results.hasSucceeded && results.payload?.page?.length > 0) {