Improve story DOE flow

ts/util/distributionListToSendTarget.ts

@@ -0,0 +1,38 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { UUIDStringType } from '../types/UUID';
+import type { SenderKeyInfoType } from '../model-types.d';
+import dataInterface from '../sql/Client';
+import type { StoryDistributionType } from '../sql/Interface';
+import type { SenderKeyTargetType } from './sendToGroup';
+import { isNotNil } from './isNotNil';
+
+export function distributionListToSendTarget(
+  distributionList: StoryDistributionType,
+  pendingSendRecipientIds: ReadonlyArray<string>
+): SenderKeyTargetType {
+  let inMemorySenderKeyInfo = distributionList?.senderKeyInfo;
+
+  const recipientsSet = new Set(pendingSendRecipientIds);
+
+  return {
+    getGroupId: () => undefined,
+    getMembers: () =>
+      pendingSendRecipientIds
+        .map(uuid => window.ConversationController.get(uuid))
+        .filter(isNotNil),
+    hasMember: (uuid: UUIDStringType) => recipientsSet.has(uuid),
+    idForLogging: () => `dl(${distributionList.id})`,
+    isGroupV2: () => true,
+    isValid: () => true,
+    getSenderKeyInfo: () => inMemorySenderKeyInfo,
+    saveSenderKeyInfo: async (senderKeyInfo: SenderKeyInfoType) => {
+      inMemorySenderKeyInfo = senderKeyInfo;
+      await dataInterface.modifyStoryDistribution({
+        ...distributionList,
+        senderKeyInfo,
+      });
+    },
+  };
+}