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

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

@@ -0,0 +1,62 @@
+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';
+import {IDENTIFIERS} from '../../shared/object-list/identifier-data/identifier-data.resource-type';
+import {IdentifierData} from '../../shared/object-list/identifier-data/identifier-data.model';
+import {getFirstCompletedRemoteData, getFirstSucceededRemoteDataPayload} from '../shared/operators';
+import {map, startWith} from 'rxjs/operators';
+import {ConfigurationProperty} from '../shared/configuration-property.model';
+import {ConfigurationDataService} from './configuration-data.service';
+
+@Injectable()
+@dataService(IDENTIFIERS)
+export class IdentifierDataService extends DataService<IdentifierData> {
+
+  protected linkPath = 'identifiers';
+
+  constructor(
+    protected comparator: DefaultChangeAnalyzer<IdentifierData>,
+    protected halService: HALEndpointService,
+    protected http: HttpClient,
+    protected notificationsService: NotificationsService,
+    protected objectCache: ObjectCacheService,
+    protected rdbService: RemoteDataBuildService,
+    protected requestService: RequestService,
+    protected store: Store<CoreState>,
+    private configurationService: ConfigurationDataService,
+  ) {
+    super();
+  }
+
+  /**
+   * Returns {@link RemoteData} of {@link IdentifierData} representing identifiers for this item
+   * @param item  Item we are querying
+   */
+  getIdentifierDataFor(item: Item): Observable<RemoteData<IdentifierData>> {
+    return this.findByHref(item._links.identifiers.href, false, true);
+  }
+
+  /**
+   * Should we allow registration of new DOIs via the item status page?
+   */
+  public getIdentifierRegistrationConfiguration(): Observable<string[]> {
+    return this.configurationService.findByPropertyName('identifiers.item-status.register').pipe(
+      getFirstCompletedRemoteData(),
+      map((propertyRD: RemoteData<ConfigurationProperty>) => propertyRD.hasSucceeded ? propertyRD.payload.values : [])
+    );
+  }
+}