Connect to a remote SSH folder with Zenity without a password

ssh-remote-folder.sh

#!/bin/bash

# Configuration
REMOTE_USER="admin"
REMOTE_IP="11.22.33.44"
REMOTE_PORT="22"
REMOTE_FOLDER="/data"
LOCAL_FOLDER="/mnt/nas"
LOCAL_KEY="~/.ssh/chiavi/nas" # Private key
# Create private and public keys with ssh-keygen
# Register public key to server with ssh-copy-id -i mykey.pub user@server

# Messages
CONNECTION_NAME="NAS"
QUESTION_CONNECT="Do you want to connect to the NAS?"
QUESTION_DISCONNECT="You are already connected to the NAS.\n\nDo you want to disconnect?"
WAIT_CONNECTION="Connection in progress..."
WAIT_DISCONNECTION="Closing the connection..."
INFO_CONNECTION_OK="Connection established successfully!"
INFO_CONNECTION_KO="Connection error"
INFO_DISCONNECTION_OK="Connection closed correctly"
INFO_DISCONNECTION_KO="Error closing connection"

PARAMS=$*

function main()
{
  if [[ ${PARAMS[0]} == "autostart" ]];then
    `silent_connection`
  else
    `manage_connection`
  fi
}

function silent_connection()
{
  if [[ `check_connection` == false ]]; then
    `start_connection`
  fi
}

function manage_connection()
{
  if [[ `check_connection` == false ]]; then
    zenity --title="${CONNECTION_NAME}" --question --text="${QUESTION_CONNECT}"
    if [[ $? == 0 ]]; then
      `zen_start_connection`
    fi
  else
    zenity --title="${CONNECTION_NAME}" --question --text="${QUESTION_DISCONNECT}"
    if [[ $? == 0 ]]; then
      `zen_stop_connection`
    fi
  fi
}

# Check if the connection exists
function check_connection()
{
  COUNT_CONNECTION=`df -h | grep ${REMOTE_USER}@${REMOTE_IP} | grep -c "${LOCAL_FOLDER}"`
  if [[ ${COUNT_CONNECTION} == 1 ]]; then
    echo true
  else
    echo false
  fi
}

function start_connection()
{
  sshfs ${REMOTE_USER}@${REMOTE_IP}:${REMOTE_FOLDER} "${LOCAL_FOLDER}" -p ${REMOTE_PORT} -o IdentityFile="${LOCAL_KEY}"
}

function stop_connection()
{
  gksudo umount "${LOCAL_FOLDER}"
}


function zen_start_connection()
{
  (`start_connection`) | zenity --title="SSH @ ${CONNECTION_NAME}" --progress --pulsate --auto-close --text="${WAIT_CONNECTION}"
  
  if [[ `check_connection` == true ]]; then
    zenity --title="SSH @ ${CONNECTION_NAME}" --info --text="${INFO_CONNECTION_OK}"
  else
    zenity --title="SSH @ ${CONNECTION_NAME}" --info --text="${INFO_CONNECTION_KO}"
  fi
}

function zen_stop_connection()
{
  (`stop_connection`) | zenity --title="SSH @ ${CONNECTION_NAME}" --progress --pulsate --auto-close --text="${WAIT_DISCONNECTION}"
  
  if [[ `check_connection` == false ]]; then
    zenity --title="SSH @ ${CONNECTION_NAME}" --info --text="${INFO_DISCONNECTION_OK}"
  else
    zenity --title="SSH @ ${CONNECTION_NAME}" --info --text="${INFO_DISCONNECTION_KO}"
  fi
}

main