Bazaar: Added 'isBazaarAvailable' helper

The EntityBazaarInfoCard shows the bazaar data for components that
have a bazaar item linked. The isBazaarAvailable helper makes it
possible to only include the EntityBazaarInfoCard for components
that actually have a bazaar project linked.

Closes #15013

Signed-off-by: Niklas Aronsson <niklasar@axis.com>

plugins/bazaar/src/api.ts

@@ -14,7 +14,9 @@
  * limitations under the License.
  */
 
+import { Entity, stringifyEntityRef } from '@backstage/catalog-model';
 import {
+  ApiHolder,
   createApiRef,
   DiscoveryApi,
   FetchApi,
@@ -46,6 +48,25 @@ export interface BazaarApi {
   deleteProject(id: number): Promise<void>;
 }
 
+/** @public */
+export const isBazaarAvailable = async (
+  entity: Entity,
+  context: { apis: ApiHolder },
+): Promise<boolean> => {
+  const bazaarClient = context.apis.get(bazaarApiRef);
+  if (bazaarClient === undefined) {
+    return false;
+  }
+  const entityRef = stringifyEntityRef({
+    kind: entity.kind,
+    name: entity.metadata.name,
+    namespace: entity.metadata.namespace,
+  });
+  const response = await bazaarClient.getProjectByRef(entityRef);
+  const project = await response.json();
+  return project.data.length > 0;
+};
+
 export class BazaarClient implements BazaarApi {
   private readonly identityApi: IdentityApi;
   private readonly discoveryApi: DiscoveryApi;

plugins/bazaar/src/index.ts

@@ -15,6 +15,7 @@
  */
 
 export { bazaarPlugin, BazaarPage } from './plugin';
+export { isBazaarAvailable } from './api';
 export { BazaarOverviewCard } from './components/BazaarOverviewCard';
 export type { BazaarOverviewCardProps } from './components/BazaarOverviewCard';
 export { EntityBazaarInfoCard } from './components/EntityBazaarInfoCard';