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Co-authored-by: Fedor Indutnyy <indutny@signal.org>

ts/util/uploadAttachment.ts

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+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import Long from 'long';
+
+import type {
+  AttachmentWithHydratedData,
+  UploadedAttachmentType,
+} from '../types/Attachment';
+import { MIMETypeToString } from '../types/MIME';
+import { padAndEncryptAttachment, getRandomBytes } from '../Crypto';
+import { strictAssert } from './assert';
+
+export async function uploadAttachment(
+  attachment: AttachmentWithHydratedData
+): Promise<UploadedAttachmentType> {
+  const keys = getRandomBytes(64);
+  const encrypted = padAndEncryptAttachment(attachment.data, keys);
+
+  const { server } = window.textsecure;
+  strictAssert(server, 'WebAPI must be initialized');
+
+  const attachmentIdString = await server.putEncryptedAttachment(
+    encrypted.ciphertext
+  );
+
+  return {
+    cdnId: Long.fromString(attachmentIdString),
+    key: keys,
+    size: attachment.data.byteLength,
+    digest: encrypted.digest,
+
+    contentType: MIMETypeToString(attachment.contentType),
+    fileName: attachment.fileName,
+    flags: attachment.flags,
+    width: attachment.width,
+    height: attachment.height,
+    caption: attachment.caption,
+    blurHash: attachment.blurHash,
+  };
+}