Move getUntrustedContacts out of conversation_view

ts/services/singleServePromise.ts

@@ -0,0 +1,44 @@
+// Copyright 2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { ExplodePromiseResultType } from '../util/explodePromise';
+import type { UUIDStringType } from '../types/UUID';
+import { UUID } from '../types/UUID';
+
+// This module provides single serve promises in a pub/sub manner.
+// One example usage is if you're calling a redux action creator but need to
+// await some result within it, you may pass in this promise and access it in
+// other parts of the app via its referencing UUID.
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+const promises = new Map<UUIDStringType, ExplodePromiseResultType<any>>();
+
+export function set<T>(
+  explodedPromise: ExplodePromiseResultType<T>
+): UUIDStringType {
+  let uuid = UUID.generate().toString();
+
+  while (promises.has(uuid)) {
+    uuid = UUID.generate().toString();
+  }
+
+  promises.set(uuid, {
+    promise: explodedPromise.promise,
+    resolve: value => {
+      promises.delete(uuid);
+      explodedPromise.resolve(value);
+    },
+    reject: err => {
+      promises.delete(uuid);
+      explodedPromise.reject(err);
+    },
+  });
+
+  return uuid;
+}
+
+export function get<T>(
+  uuid: UUIDStringType
+): ExplodePromiseResultType<T> | undefined {
+  return promises.get(uuid);
+}