Get File or Folder

//native

const graph = "https://graph.microsoft.com/v1.0"

function driveUrl(drive_id: string | undefined) {

  return drive_id != null && drive_id !== ""

    ? `${graph}/drives/${encodeURIComponent(drive_id)}`

    : `${graph}/me/drive`

}

// An item is addressed by its id, or by a path from the drive root starting with "/"

function ref(item: string | undefined) {

  if (item == null || item === "" || item === "/") return "root"

  if (!item.startsWith("/")) return `items/${encodeURIComponent(item)}`

  const path = item

    .replace(/\/+$/, "")

    .split("/")

    .map(encodeURIComponent)

    .join("/")

  return `root:${path}:`

}

/**

 * Get File or Folder

 * Get the metadata of a file or folder in your OneDrive, or in another drive when `drive_id` is set: name, size, web URL, parent, timestamps and a short-lived `@microsoft.graph.downloadUrl`. `item` is an id, or a path from the drive root starting with "/" (e.g. `/Reports/2026/summary.xlsx`). `expand` takes relationships such as `listItem`, `permissions` or `thumbnails`. Requires Files.Read (covered by the default Files.ReadWrite); a drive that is not your own needs Files.Read.All.

 */

export async function main(

  auth: RT.MsOnedrive,

  item: string,

  select: string | undefined,

  expand: string | undefined,

  drive_id: string | undefined

) {

  const drive = driveUrl(drive_id)

  const url = new URL(`${drive}/${ref(item)}`)

  if (select != null && select !== "") {

    url.searchParams.append("$select", select)

  }

  if (expand != null && expand !== "") {

    url.searchParams.append("$expand", expand)

  }

  const response = await fetch(url, {

    headers: {

      Authorization: `Bearer ${auth.token}`,

      Accept: "application/json",

    },

  })

  if (!response.ok) {

    throw new Error(`${response.status} ${await response.text()}`)

  }

  return await response.json()

}