[TLC-249] Register DOI operation and button in item status page

src/app/shared/object-list/identifier-data/identifier-data.component.ts

@@ -0,0 +1,56 @@
+import { Component, Input } from '@angular/core';
+import { catchError, map } from 'rxjs/operators';
+import { Observable, of as observableOf } from 'rxjs';
+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';
+import {IdentifierData} from './identifier-data.model';
+import {IdentifierDataService} from '../../../core/data/identifier-data.service';
+
+@Component({
+  selector: 'ds-identifier-data',
+  templateUrl: './identifier-data.component.html'
+})
+/**
+ * Component rendering the access status of an item as a badge
+ */
+export class IdentifierDataComponent {
+
+  @Input() item: Item;
+  identifiers$: Observable<IdentifierData>;
+
+  /**
+   * Whether to show the access status badge or not
+   */
+  showAccessStatus: boolean;
+
+  /**
+   * Initialize instance variables
+   *
+   * @param {IdentifierDataService} identifierDataService
+   */
+  constructor(private identifierDataService: IdentifierDataService) { }
+
+  ngOnInit(): void {
+    if (this.item == null) {
+      // Do not show the badge if the feature is inactive or if the item is null.
+      return;
+    }
+    if (this.item.identifiers == null) {
+      // In case the access status has not been loaded, do it individually.
+      this.item.identifiers = this.identifierDataService.getIdentifierDataFor(this.item);
+    }
+    this.identifiers$ = this.item.identifiers.pipe(
+      map((identifierRD) => {
+        if (identifierRD.statusCode !== 401 && hasValue(identifierRD.payload)) {
+          return identifierRD.payload;
+        } else {
+          return null;
+        }
+      }),
+      // EMpty array if none
+      //map((identifiers: IdentifierData) => hasValue(identifiers.identifiers) ? identifiers.identifiers : [])
+    );
+  }
+}