Id of credential

Fixes #90

Signed-off-by: Mirko Mollik <mirkomollik@gmail.com>

apps/holder-backend/src/app/credentials/credentials.service.ts

@@ -16,6 +16,7 @@ import { CredentialResponse } from './dto/credential-response.dto';
 import { OnEvent } from '@nestjs/event-emitter';
 import { USER_DELETED_EVENT, UserDeletedEvent } from '../auth/auth.service';
 import { Interval } from '@nestjs/schedule';
+import { createHash } from 'crypto';
 
 type DateKey = 'exp' | 'nbf';
 @Injectable()
@@ -41,20 +42,28 @@ export class CredentialsService {
   }
 
   async create(createCredentialDto: CreateCredentialDto, user: string) {
-    const credential = new Credential();
-    credential.id = createCredentialDto.id;
-    credential.user = user;
-    credential.value = createCredentialDto.value;
-    credential.metaData = createCredentialDto.metaData;
-    credential.issuer = createCredentialDto.issuer;
-    credential.nbf = await this.getDate(createCredentialDto.value, 'nbf');
-    credential.exp = await this.getDate(createCredentialDto.value, 'exp');
+    const credential = this.credentialRepository.create({
+      ...createCredentialDto,
+      user,
+      id: this.getCredentialId(createCredentialDto),
+      nbf: await this.getDate(createCredentialDto.value, 'nbf'),
+      exp: await this.getDate(createCredentialDto.value, 'exp'),
+    });
     await this.credentialRepository.save(credential);
     return {
       id: credential.id,
     };
   }
 
+  /**
+   * Create the id of the credential based on the hash of the value.
+   * @param createCredentialDto
+   * @returns
+   */
+  private getCredentialId(createCredentialDto: CreateCredentialDto): string {
+    return createHash('sha256').update(createCredentialDto.value).digest('hex');
+  }
+
   /**
    * Get the date from the credential, use key to get the correct value.
    * @param credential

libs/holder-shared/src/lib/oid4vc/issuance-request/issuance-request.component.html

@@ -10,20 +10,24 @@
     <mat-card-subtitle>{{ issuer[0].description }}</mat-card-subtitle>
   </mat-card-header>
   <img
-    *ngIf="credentials"
-    [src]="credentials[0].display![0].background_image?.url"
-    [alt]="credentials[0].display![0].background_image?.url"
+    *ngIf="
+      credentials &&
+      credentials[0].display &&
+      credentials[0].display[0].background_image
+    "
+    [src]="credentials[0].display[0].background_image.url"
+    [alt]="credentials[0].display[0].background_image.url"
   />
   <!-- instead of just the credential name, we could present the credential with it's attributes. In this case the parse event was already executed and we need a "accept" button to persist it into the database. Because it could be that the holder is denying the credential.-->
   <mat-card-content *ngIf="credentials">
     <p>wants to offer you a credential.</p>
     <mat-list>
-      <mat-list-item>
-        <span matListItemTitle>{{ credentials[0].display![0].name }}</span>
-        <span matListItemLine>{{
-          credentials[0].display![0].description
-        }}</span>
+      @for(credential of credentials; track credential) {
+      <mat-list-item *ngIf="credential.display">
+        <span matListItemTitle>{{ credential.display[0].name }}</span>
+        <span matListItemLine>{{ credential.display[0].description }}</span>
       </mat-list-item>
+      }
     </mat-list>
   </mat-card-content>
   <mat-card-actions fxLayout="row" fxLayoutAlign="space-between center">