gistfile1.txt

#!/usr/bin/env bash


show_help() {
   echo "Usage: s3get OPTIONS"
   echo "-r region"
   echo "-b bucket"
   echo "-f filename"
   exit 0
}

if [ $# -eq 0 ]
  then
    show_help
    exit 1
fi


while getopts r:b:f:a:s:h option
do
  case "${option}" in
   r) REGION=${OPTARG};;
   b) BUCKET=${OPTARG};;
   f) TSFILE=${OPTARG};;
   h) show_help
  esac
done

echo -n 'Enter AWS ACCESS KEY: '
read -s ACCESS;echo

echo -n 'Enter AWS SECRET KEY: '
read -s SECRET;echo

if [ -z $REGION ] || [ -z $BUCKET ] || [ -z $TSFILE ] || [ -z $ACCESS ] || [ -z $SECRET ]; then
show_help
fi

if ! hash openssl 2>/dev/null; then fail "openssl not installed"; fi
if ! hash curl 2>/dev/null; then fail "curl not installed"; fi

contentType="text/html; charset=UTF-8"
date="$(date -u +'%a, %d %b %Y %H:%M:%S GMT')"
resource="/${BUCKET}/${TSFILE}"
string="GET\n\n${contentType}\n\nx-amz-date:${date}\n${resource}"
signature=$(echo -en ${string} | openssl sha1 -hmac "${SECRET}" -binary | base64)

curl -H "x-amz-date: ${date}" \
     -H "Content-Type: ${contentType}" \
     -H "Authorization: AWS ${ACCESS}:${signature}" \
        "https://s3-${REGION}.amazonaws.com${resource}"