[DSC-1433] add OpenGraph and Twitter card tags to setDSOMetaTags()

Yevhenii-Lohatskyi · Yevhenii-Lohatskyi · commit b207e74f47d6 · 2024-01-16T10:00:44.000+02:00
diff --git a/src/app/core/metadata/metadata.service.ts b/src/app/core/metadata/metadata.service.ts
@@ -206,6 +206,13 @@ export class MetadataService {
       this.setCitationTechnicalReportNumberTag();
     }
 
+    this.setOpenGraphTitleTag();
+    this.setOpenGraphDescriptionTag();
+    //this.setOpenGraphImageTag();
+
+    this.setTwitterTitleTag();
+    this.setTwitterDescriptionTag();
+    //this.setTwitterImageTag();
   }
 
   /**
@@ -467,6 +474,56 @@ export class MetadataService {
     }
   }
 
+  /**
+   * Add <meta name="og:title" ... >  to the <head>
+   */
+  private setOpenGraphTitleTag(): void {
+    const value = this.getMetaTagValue('dc.title');
+    this.addMetaTag('og:title', value);
+  }
+
+  /**
+   * Add <meta name="og:description" ... >  to the <head>
+   */
+  private setOpenGraphDescriptionTag(): void {
+    // TODO: truncate abstract
+    const value = this.getMetaTagValue('dc.description.abstract');
+    this.addMetaTag('og:description', value);
+  }
+
+  /**
+   * Add <meta name="og:image" ... >  to the <head>
+   */
+  private setOpenGraphImageTag(): void {
+    const value = '';
+    this.addMetaTag('og:image', value);
+  }
+
+  /**
+   * Add <meta name="twitter:title" ... >  to the <head>
+   */
+  private setTwitterTitleTag(): void {
+    const value = this.getMetaTagValue('dc.title');
+    this.addMetaTag('twitter:title', value);
+  }
+
+  /**
+   * Add <meta name="twitter:description" ... >  to the <head>
+   */
+  private setTwitterDescriptionTag(): void {
+    // TODO: truncate abstract
+    const value = this.getMetaTagValue('dc.description.abstract');
+    this.addMetaTag('twitter:description', value);
+  }
+
+  /**
+   * Add <meta name="twitter:image" ... >  to the <head>
+   */
+  private setTwitterImageTag(): void {
+    const value = '';
+    this.addMetaTag('twitter:image', value);
+  }
+
   getBitLinkIfDownloadable(bitstream: Bitstream, bitstreamRd: RemoteData<PaginatedList<Bitstream>>): Observable<string> {
     return observableOf(bitstream).pipe(
       getDownloadableBitstream(this.authorizationService),
