add tar for preview (#713)

* add tar for preview

Author: Paurikova2

src/app/item-page/simple/field-components/preview-section/file-description/file-description.component.html

@@ -61,7 +61,7 @@
       </div>
       <div [style]="'max-height: 500px; padding: 0px; overflow: scroll'" class="panel-body">
         <ul class="treeview in collapse show">
-          <ng-container *ngIf="fileInput.format === 'application/zip'">
+          <ng-container *ngIf="fileInput.format === 'application/zip' || fileInput.format === 'application/x-tar'">
             <ds-file-tree-view
               *ngFor="let node of fileInput.fileInfo"
               [node]="node">

src/app/item-page/simple/field-components/preview-section/file-description/file-description.component.ts

@@ -3,7 +3,7 @@ import { MetadataBitstream } from 'src/app/core/metadata/metadata-bitstream.mode
 import { HALEndpointService } from '../../../../../core/shared/hal-endpoint.service';
 import {Router} from '@angular/router';
 
-const allowedPreviewFormats = ['text/plain', 'text/html', 'application/zip'];
+const allowedPreviewFormats = ['text/plain', 'text/html', 'application/zip', 'application/x-tar'];
 @Component({
   selector: 'ds-file-description',
   templateUrl: './file-description.component.html',