fix document 500 error

apps/sso-core/src/domain/documents.service.ts

@@ -124,17 +124,47 @@ export class DocumentsService {
   }
 
   private toResponse(document: Awaited<ReturnType<PrismaService['userDocument']['create']>>) {
-    const metadata = document.metadata as { encryptedPayload?: string } | null;
     return {
       id: document.id,
       userId: document.userId,
       type: document.type,
-      number: this.encryption.decrypt(document.number),
-      issuedAt: document.issuedAt?.toISOString(),
-      expiresAt: document.expiresAt?.toISOString(),
-      metadataJson: metadata?.encryptedPayload ? this.encryption.decrypt(metadata.encryptedPayload) : undefined,
-      createdAt: document.createdAt.toISOString(),
-      updatedAt: document.updatedAt.toISOString()
+      number: this.encryption.decryptIfNeeded(document.number),
+      issuedAt: this.formatOptionalDate(document.issuedAt),
+      expiresAt: this.formatOptionalDate(document.expiresAt),
+      metadataJson: this.resolveMetadataJson(document.metadata),
+      createdAt: this.formatRequiredDate(document.createdAt),
+      updatedAt: this.formatRequiredDate(document.updatedAt)
     };
   }
+
+  private resolveMetadataJson(metadata: Prisma.JsonValue | null): string | undefined {
+    if (!metadata || typeof metadata !== 'object' || Array.isArray(metadata)) {
+      return undefined;
+    }
+
+    const record = metadata as Record<string, unknown>;
+    if (typeof record.encryptedPayload === 'string') {
+      return this.encryption.decryptIfNeeded(record.encryptedPayload);
+    }
+
+    if (Object.keys(record).length === 0) {
+      return undefined;
+    }
+
+    return JSON.stringify(record);
+  }
+
+  private formatOptionalDate(value: Date | null | undefined): string | undefined {
+    if (!value || Number.isNaN(value.getTime())) {
+      return undefined;
+    }
+    return value.toISOString();
+  }
+
+  private formatRequiredDate(value: Date): string {
+    if (Number.isNaN(value.getTime())) {
+      return new Date(0).toISOString();
+    }
+    return value.toISOString();
+  }
 }