#!/bin/bash
#
# wordpress-tools
# https://git.stack-source.com/msb/wordpress-tools
# MIT License Copyright (c) 2021 Matthew Saunders Brown

# require root
if [ "${EUID}" -ne 0 ]; then
  echo "This script must be run as root"
  exit
fi

virtualhost_basedir="/srv/www"
virtualhost_htdocsdir="html"

declare -a input_keys_index
input_keys_index=(v r t e u p m d n w x s)

declare -A input_keys_array
input_keys_array[v]="VirtualHost"
input_keys_array[r]="URL"
input_keys_array[t]="Site Title"
input_keys_array[e]="Admin Email"
input_keys_array[u]="Admin Username"
input_keys_array[p]="Admin Password"
input_keys_array[m]="MySQL Hostname"
input_keys_array[d]="MySQL Database"
input_keys_array[n]="MySQL Username"
input_keys_array[w]="MySQL Password"
input_keys_array[x]="MySQL DB Prefix"
input_keys_array[s]="Shell Username"

declare -A input_values_array

help()
{
  thisfilename=$(basename -- "$0")
  echo "$thisfilename - Install WordPress to a specific VirtualHost."
  echo ""
  echo "Usage: $thisfilename [-v VirtualHost] [-r URL] [-t Site Title] [-e Admin Email] [-u Admin Username] [-p Admin Password] [-h MySQL Hostname] [-d MySQL Database] [-n MySQL Username] [-w MySQL Password] [-x MySQL DB Prefix] [-s Shell Username]"
  echo ""
  echo "  -v VirtualHost      VirtualHost that WordPress install is for, only option that is required - all others have automatic defaults."
  echo "  -r URL              Site URL for WordPress install, defaults to VirtualHost."
  echo "  -t Site Title       Site Title for WordPress install, defaults to VirtualHost."
  echo "  -e Admin Email      Email address for WordPress admin user, defaults to 'Admin username'@'VirtualHost'"
  echo "  -u Admin Username   Username for WordPress admin user, defaults to Shell Username"
  echo "  -p Admin Password   Password for WordPress admin user, random password is generated if not set."
  echo "  -m MySQL Hostname   MySQL Hostname, defaults to 127.0.0.1"
  echo "  -d MySQL Database   MySQL Database, defaults to 'VirtualHost' with dots & dashes changed from symbols to words if not specified."
  echo "  -n MySQL Username   MySQL Username, defaults to 'Shell Username'@'VirtualHost' if not specified."
  echo "  -w MySQL Password   MySQL Hostname, random password is generated if not set."
  echo "  -x MySQL DB Prefix  WordPress db table prefix, defaults to wp_"
  echo "  -s Shell Username   System user that owns website files for this VirtualHost, autodetected and reset if not specified correctly."
  echo "  -f                  Force install - skips install confirmation step, for automated installs."
  echo "  -h                  Print this help."
  echo ""
  echo "                      You will be prompted to any options that were not"
  echo "                      specified on the command line and given a chance"
  echo "                      to confirm before performing the install unless the"
  echo "                      -f option is specified."
  exit
}

# force (-f) defaults to false
force=false

# set any options that were passed
while getopts "v:r:t:e:u:p:m:d:n:w:x:s:fh" opt; do
  case "${opt}" in
    h )
      help
      exit;;
    v )
      input_values_array[v]=${OPTARG}
      ;;
    r )
      input_values_array[r]=${OPTARG}
      ;;
    t )
      input_values_array[t]=${OPTARG}
      ;;
    e )
      input_values_array[e]=${OPTARG}
      ;;
    u )
      input_values_array[u]=${OPTARG}
      ;;
    p )
      input_values_array[p]=${OPTARG}
      ;;
    m )
      input_values_array[m]=${OPTARG}
      ;;
    d )
      input_values_array[d]=${OPTARG}
      ;;
    n )
      input_values_array[n]=${OPTARG}
      ;;
    w )
      input_values_array[w]=${OPTARG}
      ;;
    x )
      input_values_array[x]=${OPTARG}
      ;;
    s )
      input_values_array[s]=${OPTARG}
      ;;
    f )
      force=true
      ;;
    \? )
      echo "Invalid option: $OPTARG" 1>&2
      exit 1;;
    : )
      echo "Invalid option: $OPTARG requires an argument" 1>&2
      exit 1;;
  esac
done

# v - virtualhost
function validate_v() {
  if [ -d "$virtualhost_basedir/${input_values_array[v]}" ]; then
    if [ -d "$virtualhost_basedir/${input_values_array[v]}/$virtualhost_htdocsdir" ]; then
      # make sure DocumentRoot is empty (except for possible index.html file)
      htdocsdir_file_count=`/usr/bin/ls $virtualhost_basedir/${input_values_array[v]}/$virtualhost_htdocsdir|grep -v index.html|wc -l`
      if [ $htdocsdir_file_count -gt 0 ]; then
        echo "$virtualhost_basedir/${input_values_array[v]}/$virtualhost_htdocsdir appears to contain an existing website."
        echo "Manually remove all files before attempting to install WordPress"
        exit
      fi
    else
      echo "${input_values_array[v]} is installed, but DocumentRoot for ${input_values_array[v]} does not exist."
      echo "$virtualhost_basedir/${input_values_array[v]}/$virtualhost_htdocsdir"
      exit
    fi
  else
    echo "VirtualHost ${input_values_array[v]} is not installed on this server."
    echo "$virtualhost_basedir/${input_values_array[v]}/$virtualhost_htdocsdir"
    unset input_values_array[v]
  fi
}
if [ -n "${input_values_array[v]}" ] ; then
  validate_v
fi
if [ -z "${input_values_array[v]}" ] ; then
  while [ -z "${input_values_array[v]}" ]; do
    read -p "Enter the VirtualHost for WordPress install: " virtualhost
    if [ -n "$virtualhost" ] ; then
      input_values_array[v]=$virtualhost
      validate_v
    fi
  done
fi

# s - Shell Username
function validate_s() {
  # force shell user value, user can't override
  shell_username=$(stat -c '%U' $virtualhost_basedir/${input_values_array[v]})
  if [[ ${input_values_array[s]} != $shell_username ]]; then
    echo "ERROR: Incorrect Shell Username, forcing value reset."
    input_values_array[s]=$shell_username
  fi
}
if [ -z "${input_values_array[s]}" ] ; then
  input_values_array[s]=$(stat -c '%U' $virtualhost_basedir/${input_values_array[v]})
fi
if [ -n "${input_values_array[e]}" ] ; then
  validate_s
fi

# u - URL
function validate_u() {
  if [[ ${input_values_array[r]} != *"${input_values_array[v]}"* ]] ; then
    echo "URL (${input_values_array[r]}) does not appear to be based on VirtualHost (${input_values_array[v]})"
    unset input_values_array[r]
  fi
}
if [ -z "${input_values_array[r]}" ] ; then
  input_values_array[r]="www.${input_values_array[v]}"
fi
if [ -n "${input_values_array[r]}" ] ; then
  validate_u
fi

# t - Site Title
if [ -z "${input_values_array[t]}" ] ; then
  input_values_array[t]="${input_values_array[v]}"
fi

# e - Admin Email
function validate_e() {
  regex="^[a-z0-9!#\$%&'*+/=?^_\`{|}~-]+(\.[a-z0-9!#$%&'*+/=?^_\`{|}~-]+)*@([a-z0-9]([a-z0-9-]*[a-z0-9])?\.)+[a-z0-9]([a-z0-9-]*[a-z0-9])?\$"
  if ! [[ ${input_values_array[e]} =~ $regex ]] ; then
    read -p "ERROR: Invalid email address, please re-enter: " admin_email
    if [ -n "$admin_email" ] ; then
      input_values_array[e]=$admin_email
      validate_e
    fi
  fi
}
if [ -z "${input_values_array[e]}" ] ; then
  input_values_array[e]="${input_values_array[s]}@${input_values_array[v]}"
fi
if [ -n "${input_values_array[e]}" ] ; then
  validate_e
fi

# u - Admin Username
if [ -z "${input_values_array[u]}" ] ; then
  input_values_array[u]=${input_values_array[s]}
fi

# p - Admin Password
if [ -z "${input_values_array[p]}" ] ; then
  input_values_array[p]=`pwgen -1 8`
fi

# m - MySQL Hostname
if [ -z "${input_values_array[m]}" ] ; then
  if [ -f "$virtualhost_basedir/${input_values_array[v]}/.my.cnf" ]; then
    input_values_array[m]=`grep host /srv/www/${input_values_array[v]}/.my.cnf |cut -d = -f 2`
  else
    input_values_array[m]="127.0.0.1"
  fi
fi

# d - MySQL Database
if [ -z "${input_values_array[d]}" ] ; then
  if [ -f "$virtualhost_basedir/${input_values_array[v]}/.my.cnf" ]; then
    input_values_array[d]=`grep database /srv/www/${input_values_array[v]}/.my.cnf |cut -d = -f 2`
  else
    mysql_database=${input_values_array[v]}
    mysql_database=${mysql_database//./dot}
    mysql_database=${mysql_database//-/dash}
    input_values_array[d]=$mysql_database
  fi
fi

# n - MySQL Username
if [ -z "${input_values_array[n]}" ] ; then
  if [ -f "$virtualhost_basedir/${input_values_array[v]}/.my.cnf" ]; then
    input_values_array[n]=`grep user /srv/www/${input_values_array[v]}/.my.cnf |cut -d = -f 2`
  else
    input_values_array[n]="${input_values_array[s]}@${input_values_array[v]}"
  fi
fi

# w - MySQL Password
if [ -z "${input_values_array[w]}" ] ; then
  if [ -f "$virtualhost_basedir/${input_values_array[v]}/.my.cnf" ]; then
    input_values_array[w]=`grep password /srv/www/${input_values_array[v]}/.my.cnf |cut -d = -f 2`
  else
    input_values_array[w]=`pwgen -1 16`
  fi
fi

# w - MySQL Password
function validate_w() {
  mysql_username_count=`mysql -s -N -e "SELECT COUNT(*) FROM mysql.user WHERE User='${input_values_array[n]}'"`
  if [[ "$mysql_username_count" -gt 0 ]]; then
    mysql_password_verification=`mysql -s -A -N -e "SELECT COUNT(1) Password_is_OK FROM mysql.user WHERE user='${input_values_array[n]}' AND password=PASSWORD('${input_values_array[w]}')"`
    if [[ "$mysql_password_verification" -ne 1 ]]; then
      read -p "ERROR: Invalid MySQL Password for existing MySQL User ${input_values_array[n]}, please enter current password: " mysql_password
      if [ -n "$mysql_password" ] ; then
        input_values_array[w]=$mysql_password
        restart_script
      fi
    fi
  fi
}

# x - MySQL DB Prefix
function validate_x() {
  if mysql -e "USE ${input_values_array[d]}" 2> /dev/null; then
    mysql_db_prefix=`echo ${input_values_array[x]} |sed 's|_|\\\_|g'`
    mysql_db_prefix_count=`mysql -s -N -e "SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '${input_values_array[d]}' AND TABLE_NAME LIKE '$mysql_db_prefix%'"`
    if [[ "$mysql_db_prefix_count" -gt 0 ]]; then
      read -p "One or more MySQL tables with DB Prefix '${input_values_array[x]}' already exist, please enter new prefix: " mysql_db_prefix
      if [ -n "$mysql_db_prefix" ] ; then
        input_values_array[x]=$mysql_db_prefix
        restart_script
      fi
    fi
  fi
}
if [ -z "${input_values_array[x]}" ] ; then
  input_values_array[x]="wp_"
fi
# if [ -n "${input_values_array[x]}" ] ; then
#   validate_x
# fi

# display confirmation
function display_confirmation() {
  echo
  for key in "${!input_keys_index[@]}" ; do
    value=${input_keys_index[$key]}
    echo "$value - ${input_keys_array[$value]}: ${input_values_array[$value]}"
  done
  echo
  echo "i - install now with these settings"
  echo "q - quit without installing"
  echo
  read -p "Select option to edit or install/quit: " option
  echo
}

function restart_script() {
  # set command line args
  cli_args=
  for key in "${!input_values_array[@]}" ; do
    value=${input_values_array[$key]}
    cli_args="$cli_args -$key '$value'"
  done
#   echo "${0} $cli_args"
  echo
  eval ${0} $cli_args
  exit
}

if [[ "$force" == "false" ]]; then
  display_confirmation
else
  option="i"
fi

if [[ "$option" == "i" ]]; then

  # validate MySQL DB Prefix
  validate_x
  # validate MySQL User Password
  validate_w

  echo
  echo "Installing WP for VirtualHost ${input_values_array[v]} now..."

  # create database if it doesn't already exist
  if ! mysql -e "USE ${input_values_array[d]}" 2> /dev/null; then
    mysqladmin create ${input_values_array[d]}
  fi

  # create mysql user if they don't already exist
  if [[ "$mysql_username_count" -eq 0 ]]; then
    mysql -e "CREATE USER '${input_values_array[n]}'@'${input_values_array[m]}' IDENTIFIED BY '${input_values_array[w]}'"
  fi

  # add db privileges for mysql user if no already enabled
  if ! mysql --host=${input_values_array[m]} --user=${input_values_array[n]} --password=${input_values_array[w]} -e "USE ${input_values_array[d]}" 2> /dev/null; then
    mysql -e "GRANT ALL PRIVILEGES ON ${input_values_array[d]}.* TO '${input_values_array[n]}'@'${input_values_array[m]}'"
    mysqladmin flush-privileges
  fi

  # switch to Shell User and install WordPress
sudo -u ${input_values_array[s]} --shell /bin/bash << EOF
cd $virtualhost_basedir/${input_values_array[v]}/$virtualhost_htdocsdir
wp core download
wp config create --dbhost="${input_values_array[m]}" --dbname=${input_values_array[d]} --dbuser="${input_values_array[n]}" --dbpass="${input_values_array[w]}" --dbprefix="${input_values_array[x]}"
wp config set DISALLOW_FILE_EDIT true
wp config set DISABLE_WP_CRON true
wp core install --url="${input_values_array[r]}" --title="${input_values_array[v]}" --admin_user=${input_values_array[u]} --admin_password="${input_values_array[p]}" --admin_email=${input_values_array[e]}
wp option set permalink_structure "/%postname%/"
echo "apache_modules:" > wp-cli.local.yml
echo "  - mod_rewrite" >> wp-cli.local.yml
wp rewrite flush --hard
rm wp-cli.local.yml
EOF

  if [ -f "$virtualhost_basedir/${input_values_array[v]}/$virtualhost_htdocsdir/index.html" ]; then
    /usr/bin/rm $virtualhost_basedir/${input_values_array[v]}/$virtualhost_htdocsdir/index.html
  fi

elif [[ "$option" == "q" ]]; then
  echo "Quiting without installing."
elif [[ " ${input_keys_index[@]} " =~ " $option " ]]; then
  read -p "Enter new value for ${input_keys_array[$option]} (${input_values_array[$option]}): " new_value
  if [ -n "$new_value" ] ; then
    input_values_array[$option]=$new_value
  fi
  restart_script
else
  echo "ERROR: Invalid entry, try again."
fi