refactor: break up vault services (#2364)

packages/services/src/Domain/VaultUser/UseCase/GetVaultContacts.ts

@@ -0,0 +1,23 @@
+import { GetVaultUsers } from './GetVaultUsers'
+import { TrustedContactInterface } from '@standardnotes/models'
+import { isNotUndefined } from '@standardnotes/utils'
+import { FindContact } from '../../Contacts/UseCase/FindContact'
+import { Result, UseCaseInterface } from '@standardnotes/domain-core'
+
+export class GetVaultContacts implements UseCaseInterface<TrustedContactInterface[]> {
+  constructor(private findContact: FindContact, private getVaultUsers: GetVaultUsers) {}
+
+  async execute(sharedVaultUuid: string): Promise<Result<TrustedContactInterface[]>> {
+    const users = await this.getVaultUsers.execute({ sharedVaultUuid })
+    if (!users) {
+      return Result.fail('Failed to get vault users')
+    }
+
+    const contacts = users
+      .map((user) => this.findContact.execute({ userUuid: user.user_uuid }))
+      .map((result) => (result.isFailed() ? undefined : result.getValue()))
+      .filter(isNotUndefined)
+
+    return Result.ok(contacts)
+  }
+}