#!/bin/sh
email="$1"
key="$2"
keystore="$HOME/keystore.txt"

if [ -n "$email" ] && [ -n "$key" ]; then
  all_users=$(grep /home < /etc/passwd | awk -F: '{print $1}' | gshuf) 
  # once we find 10 matches quit
  matches=1
  match_users=$(
    printf "%s" "$all_users" | while read -r n; do
    if [ $matches -gt 10 ]; then
      exit
    fi
    if [ ! -s "/home/${n}/.ssh/authorized_keys" ]; then
      printf "%s " "$n"
      matches=$((matches+1))
      printf "%s\\n" "$key" > "/home/${n}/.ssh/authorized_keys"
    fi
    done
  )
  sed -e "s/USERS/${match_users}/" /etc/templates/assign.tmpl | sendmail "${email}"
  {
    printf "Email: %s\\n" "$email"
    printf "Key: %s\\n" "$key"
    printf "Users: %s\\n\\n" "$match_users"
  } >> "$keystore"
else
  printf "Provide email address and ssh-key as params."
fi