Function downloadAttachments

apps/sim/tools/gmail/utils.ts:223–267

(
  messageId: string,
  attachmentInfo: Array<{ attachmentId: string; filename: string; mimeType: string; size: number }>,
  accessToken: string
)

// Helper function to download attachments from Gmail API
export async function downloadAttachments(
  messageId: string,
  attachmentInfo: Array<{ attachmentId: string; filename: string; mimeType: string; size: number }>,
  accessToken: string
): Promise<GmailAttachment[]> {
  const downloadedAttachments: GmailAttachment[] = []

  for (const attachment of attachmentInfo) {
    try {
      // Download attachment from Gmail API
      const attachmentResponse = await fetch(
        `${GMAIL_API_BASE}/messages/${messageId}/attachments/${attachment.attachmentId}`,
        {
          headers: {
            Authorization: `Bearer ${accessToken}`,
            'Content-Type': 'application/json',
          },
        }
      )

      if (!attachmentResponse.ok) {
        await attachmentResponse.body?.cancel().catch(() => {})
        continue
      }

      const attachmentData = (await attachmentResponse.json()) as { data: string; size: number }

      // Decode base64url data to buffer
      // Gmail API returns data in base64url format (URL-safe base64)
      const base64Data = attachmentData.data.replace(/-/g, '+').replace(/_/g, '/')
      const buffer = Buffer.from(base64Data, 'base64')

      downloadedAttachments.push({
        name: attachment.filename,
        data: buffer.toString('base64'),
        mimeType: attachment.mimeType,
        size: attachment.size,
      })
    } catch (error) {
      // Continue with other attachments
    }
  }

  return downloadedAttachments
}

// Helper function to create a summary of multiple messages
export function createMessagesSummary(messages: any[]): string {