Function downloadAttachmentContents

apps/sim/lib/mothership/inbox/executor.ts:433–511

* Download attachment content from AgentMail, convert to file content objects * for the LLM, and upload to copilot storage for chat display.

(
  attachments: AgentMailAttachment[],
  inboxProviderId: string | null,
  messageId: string | null,
  taskId: string,
  userId: string
)

 * for the LLM, and upload to copilot storage for chat display.
 */
async function downloadAttachmentContents(
  attachments: AgentMailAttachment[],
  inboxProviderId: string | null,
  messageId: string | null,
  taskId: string,
  userId: string
): Promise<DownloadedAttachments> {
  if (!inboxProviderId || !messageId || attachments.length === 0) {
    return { fileAttachments: [], storedAttachments: [] }
  }

  const eligible = attachments.filter((a) => {
    if (a.size > MAX_ATTACHMENT_SIZE) {
      logger.info('Skipping large attachment', { taskId, filename: a.filename, size: a.size })
      return false
    }
    return true
  })

  const settled = await Promise.allSettled(
    eligible.map(async (attachment) => {
      const arrayBuffer = await agentmail.getAttachment(
        inboxProviderId,
        messageId,
        attachment.attachment_id
      )
      const buffer = Buffer.from(arrayBuffer)
      const fileContent = createFileContent(buffer, attachment.content_type)
      if (!fileContent) return null

      const storageKey = `copilot/${Date.now()}-${attachment.attachment_id}-${attachment.filename}`
      const uploaded = await uploadFile({
        file: buffer,
        fileName: attachment.filename,
        contentType: attachment.content_type,
        context: 'copilot',
        customKey: storageKey,
        preserveKey: true,
        metadata: { userId, originalName: attachment.filename },
      })

      const stored: StoredAttachment = {
        id: attachment.attachment_id,
        key: uploaded.key,
        filename: attachment.filename,
        media_type: attachment.content_type,
        size: buffer.length,
      }

      return { fileContent: { ...fileContent, filename: attachment.filename }, stored }
    })
  )

  const fileAttachments: Array<MessageContent & { filename: string }> = []
  const storedAttachments: StoredAttachment[] = []
  for (let i = 0; i < settled.length; i++) {
    const outcome = settled[i]
    if (outcome.status === 'fulfilled' && outcome.value) {