This is a very basic one, should cover what you need tho :) Unforunatly you cant check if a nick isop without joining the channel. The reason the check is on a timer is because the IAL isnt updated until the join event ends, so if you check if $nick isop before the join event has ended it wont see them as an op.

on *:INVITE:#: {
  if (!$hget(spamcheck,$chan)) {
      hadd -mz spamcheck $chan 60
      hadd -mu5 invite $chan $nick 
      join $chan
  }
  else {
      .notice $nick I was just invited to $chan $+ . Please wait $duration($hget(spamcheck,$chan)) before inviting me again
  }
}

on *:JOIN:#: {
  if ($nick == $me) && ($hget(invite,$chan)) {
      $+(.timer_checkop_,$chan) 1 1 check_op $hget(invite,$chan) $chan
  }
}

alias check_op {
  if ($1 isop $2) || ($1 ishop $2) {
      msg $2 Hi there im $me $+ . I was invited by $1 $+ .
  }
  else {
      part $2 I was invited by a non-op. Please try again
  }
}