#!/usr/bin/env bash
# wrapper for curl with modified server name indication

# exit if a command fails
set -o errexit

# exit if required variables are not set
set -o nounset

# if no scheme is provided, use https
SCHEME="${SCHEME:-https}"

# if scheme is https, use port 443
if [ "${SCHEME}" == "https" ]; then
  PORT=443
# if scheme is http, use port 80
elif [ "${SCHEME}" == "http" ]; then
  PORT=80
# otherwise exit with error
else
  echo -e "\\nInvalid scheme. Valid options: http, https\\n"
  exit 1
fi

# if exactly two arguments are provided, run non-interactively
if [ "$#" -eq 2 ]; then
  DOMAIN="$1"
  IP_ADDR="$2"
# if no arguments are provided, prompt user for information
elif [ "$#" -eq 0 ]; then
  read -p -r "What domain would you like to access? " DOMAIN
  read -p -r "What IP would you like to resolve to? " IP_ADDR
# otherwise exit with error
else
  echo -e "\\nUsage: $0 [domain] [ip address]\\n"
  exit 1
fi

# add a space for pretty formatting
echo ""

# run the actual curl command
curl -k -I --resolve "${DOMAIN}":"${PORT}":"${IP_ADDR}" "${SCHEME}"://"${DOMAIN}"