Moves DraftAttachments into redux

ts/util/resolveAttachmentOnDisk.ts

@@ -0,0 +1,40 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { pick } from 'lodash';
+
+import * as log from '../logging/log';
+import { AttachmentType } from '../types/Attachment';
+
+export function resolveAttachmentOnDisk(
+  attachment: AttachmentType
+): AttachmentType {
+  let url = '';
+  if (attachment.pending) {
+    return attachment;
+  }
+
+  if (attachment.screenshotPath) {
+    url = window.Signal.Migrations.getAbsoluteDraftPath(
+      attachment.screenshotPath
+    );
+  } else if (attachment.path) {
+    url = window.Signal.Migrations.getAbsoluteDraftPath(attachment.path);
+  } else {
+    log.warn(
+      'resolveOnDiskAttachment: Attachment was missing both screenshotPath and path fields'
+    );
+  }
+  return {
+    ...pick(attachment, [
+      'blurHash',
+      'caption',
+      'contentType',
+      'fileName',
+      'path',
+      'size',
+    ]),
+    pending: false,
+    url,
+  };
+}