How do you get the account name for a given folder?

[eyalroz]

Suppose I have a folder (i.e. an nsIMsgFolder instance). How do I get its account? I suppose I could parse its URI to get some string ID, but is there a more civilized and idiomatic way to do this?

PS - Asking about regular Thunderbird extension/core code, not WebExtensions.

[eyalroz]

Given a nsIMsgFolder f, you can get the root folder as f.server.rootFolder. Now, for many things, it's actually the root folder you want rather than the account. If you really need the nsIMsgAccount, you can get it with this function:

function rootFolderToAccount(rootFolder) {
  for (let account of MailServices.accounts.accounts) {
    if (rootFolder == account.incomingServer.rootMsgFolder)
      return account;
  }
  return null;
}

yes, it's an iteration :-(

[jobisoft]

let server = folder.server;
let account = MailServices.accounts.FindAccountForServer(server);

[jobisoft]

But I guess it is doing the iteration internally as well.