Function processAttachment

ts/textsecure/processDataMessage.preload.ts:75–142

(
  attachment?: Proto.AttachmentPointer | null
)

): ProcessedAttachment | undefined;

export function processAttachment(
  attachment?: Proto.AttachmentPointer | null
): ProcessedAttachment | undefined {
  if (attachment == null) {
    return undefined;
  }

  const {
    cdnNumber,
    attachmentIdentifier,
    clientUuid,
    key,
    size,
    contentType,
    digest,
    incrementalMac,
    chunkSize,
    fileName,
    flags,
    width,
    height,
    caption,
    blurHash,
  } = attachment;

  if (!isNumber(size)) {
    throw new Error('Missing size on incoming attachment!');
  }

  let uploadTimestamp: number | undefined =
    toNumber(attachment.uploadTimestamp) ?? 0;

  // Make sure uploadTimestamp is not set to an obviously wrong future value (we use
  // uploadTimestamp to determine whether to re-use CDN pointers)
  if (uploadTimestamp && uploadTimestamp > Date.now() + 12 * HOUR) {
    log.warn('uploadTimestamp is in the future, dropping');
    uploadTimestamp = undefined;
  }

  return {
    cdnKey: attachmentIdentifier?.cdnKey,
    cdnNumber: cdnNumber ?? 0,
    chunkSize: chunkSize ?? 0,
    fileName: fileName ?? '',
    flags: flags ?? 0,
    width: width ?? 0,
    height: height ?? 0,
    caption: caption ?? '',
    blurHash: blurHash ?? '',
    uploadTimestamp,
    cdnId:
      attachmentIdentifier?.cdnId === 0n
        ? undefined
        : attachmentIdentifier?.cdnId?.toString(),
    clientUuid: Bytes.isNotEmpty(clientUuid)
      ? bytesToUuid(clientUuid)
      : undefined,
    contentType: contentType