Credential offer can be resolved multiple times simultaneously

packages/runtime/src/dataViews/DataViewExpander.ts

@@ -143,6 +143,7 @@ import {
 import { FileDVO, IdentityDVO, MessageDVO, MessageStatus, RecipientDVO, RelationshipDVO, RelationshipDirection, RelationshipTemplateDVO } from "./transport";
 
 export class DataViewExpander {
+    private readonly credentialOfferCache = new Map<string, Promise<any>>();
     public constructor(
         @Inject private readonly transport: TransportServices,
         @Inject private readonly consumption: ConsumptionServices,
@@ -641,13 +642,21 @@ export class DataViewExpander {
             case "ShareCredentialOfferRequestItem":
                 const shareCredentialOfferRequestItem = requestItem as ShareCredentialOfferRequestItemJSON;
 
-                const credentialResponses = await (async () => {
-                    try {
-                        return await this.consumptionController.openId4Vc.requestAllCredentialsFromCredentialOfferUrl(shareCredentialOfferRequestItem.credentialOfferUrl);
-                    } catch {
-                        return;
-                    }
-                })();
+                // Use cache to avoid duplication of requests for the same URL
+                let credentialResponsesPromise = this.credentialOfferCache.get(shareCredentialOfferRequestItem.credentialOfferUrl);
+
+                if (!credentialResponsesPromise) {
+                    credentialResponsesPromise = (async () => {
+                        try {
+                            return await this.consumptionController.openId4Vc.requestAllCredentialsFromCredentialOfferUrl(shareCredentialOfferRequestItem.credentialOfferUrl);
+                        } catch {
+                            return undefined;
+                        }
+                    })();
+
+                    this.credentialOfferCache.set(shareCredentialOfferRequestItem.credentialOfferUrl, credentialResponsesPromise);
+                }
+                const credentialResponses = await credentialResponsesPromise;
 
                 return {
                     ...shareCredentialOfferRequestItem,