app-manager.sh

#!/bin/bash -i

red='\033[0;31m'
clear='\033[0m'

function welcome() {
  clear
  echo -e "============================================="
  echo -e "==  Welcome to Application Manager Wizard  =="
  echo -e "---------------------------------------------"
  echo -e "==    For Ubuntu 20.04 on Digital Ocean    =="
  echo -e "============================================="
  echo -e "=="
}

function goodbye() {
  echo -e "=="
  echo -e "==  Congratulations"
  echo -e "==  Operation succesfully."
  echo -e "=="
  echo -e "=="
  echo -e "============================================="
  echo -e "==        Made with ${red}❤️${clear} from ©Factman        =="
  echo -e "============================================="
}

function setupAliases() {
  if alias | grep -q appman; then
    echo ""
  else
    printf "\n\n#########################\n## App Manager Aliases ##\n#########################\nalias appman=\"~/.app-manager.sh\"\nalias appmanager=\"~/.app-manager.sh\"\n\n" >>~/.bashrc
    source ~/.bashrc
  fi
}

function setFirewall() {
  echo "=="
  echo -e "==  > Setting Up a Basic Firewall..."
  echo "=="
  ufw allow OpenSSH
  ufw enable
  echo "=="
}

function aptUpdate() {
  echo "=="
  echo -e "==  > Updating apt libraries..."
  echo "=="
  sudo apt -y update
  echo "=="
}

function setupNginx() {
  aptUpdate
  echo "=="
  echo -e "==  > Installing Nginx..."
  echo "=="
  sudo apt install nginx
  sudo sed -i "s/# server_names_hash_bucket_size/server_names_hash_bucket_size/" /etc/nginx/nginx.conf
  sudo nginx -t
  sudo systemctl restart nginx
  echo "=="
}

function enablingHTTPS() {
  setFirewall
  echo "=="
  echo -e "==  > Installing let's encrypt..."
  echo "=="
  sudo apt -y install certbot python3-certbot-nginx
  echo "=="
  echo "=="
  echo -e "==  > Updating the firewall..."
  sudo ufw allow 'Nginx Full'
  echo "=="
}

function enablingHTTP() {
  setFirewall
  echo "=="
  echo -e "==  > Updating the firewall..."
  sudo ufw allow 'Nginx HTTP'
  echo "=="
}

function installNVM() {
  echo "=="
  echo -e "==  > Installing NVM..."
  echo "=="
  curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash
  export NVM_DIR="$HOME/.nvm"
  [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
  [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"
  source ~/.bashrc
  source ~/.profile
  echo "=="
  echo "=="
  echo -e "==  > Installed NVM: v$(nvm -v)"
  echo "=="
}

function installNodeJS() {
  echo "=="
  echo -e "==  > Installing NodeJS v$1..."
  echo "=="
  nvm install $1
  nvm use node
  echo "=="
  echo "=="
  echo -e "==  > Installed Node: $(node -v)"
  echo -e "==  > Installed NPM: v$(npm -v)"
  echo "=="
}

function installPM2() {
  source ~/.bashrc
  source ~/.profile
  echo "=="
  echo -e "==  > Installing PM2..."
  echo "=="
  npm install -g pm2
  echo "=="
  echo "=="
  pm2Save=$(pm2 startup)
  pm2ver=$(pm2 -v)
  echo "==  sudo ${pm2Save##*"sudo "}"
  echo "=="
  echo -e "==  > IMPORTANT: You must run the code above to complete installation."
  echo "=="
  echo "=="
  echo -e "==  > Installed PM2: v$(pm2 -v)"
  echo "=="
  source ~/.bashrc
  source ~/.profile
}

function output() {
  echo "=="
  echo -e -n "==  $1: "
  read $2
}

function checkInput() {
  case $1 in
  n | N | no | No | NO) echo "n" ;;
  y | Y | yes | Yes | YES) echo "y" ;;
  *) echo $2 ;;
  esac
}

function init() {
  # Installation Options
  echo "=="
  echo -e "==  Press (Y) for Yes & (N) for No"
  output "Install Nginx (Yes)" installNginx
  output "Enable HTTPS with Let's Encrypt (Yes)" enableHttps
  output "Install NVM/NodeJS/NPM (Yes)" installNode
  if [[ $(checkInput "$installNode" "y") = "y" ]]; then
    output "Node version (lts)" nodeVersion
  fi
  output "Install PM2 (Yes)" installPM

  # installing Nginx
  if [[ $(checkInput "$installNginx" "y") = "y" ]]; then
    setupNginx
    if [[ $(checkInput "$enableHttps" "y") = "y" ]]; then
      enablingHTTPS
    else
      enablingHTTP
    fi
  fi

  # installing NVM/Node/NPM
  if [[ $(checkInput "$installNode" "y") = "y" ]]; then
    installNVM
    if [[ -z $nodeVersion ]]; then
      installNodeJS "lts"
    else
      installNodeJS "$nodeVersion"
    fi
  fi

  # installing PM2
  if [[ $(checkInput "$installPM" "y") = "y" ]]; then
    installPM2
  fi
}

function updateSystem() {
  echo "=="
  echo -e "==  > Updating Server..."
  echo "=="
  apt -y update
  echo "=="
  echo "=="
  echo -e "==  > Upgrading Server..."
  echo "=="
  apt -y upgrade
  echo "=="
  echo "=="
}

# Layout start here
setupAliases

if [[ $1 = "install" ]]; then
  welcome
  echo "==  Installation in progress..."
  init
elif [[ $1 = "update" ]]; then
  output "Update Server? (Yes)" updateServer
  if [[ $(checkInput "$updateServer" "y") = "y" ]]; then
    updateSystem
  fi
fi

# Layout end here
goodbye