rmS3

#!/bin/bash

ENV_FILE=".env"

#
# loads the s3 env variables
#
load_s3_env_vars () {
  if [ -f "${ENV_FILE}" ]
  then
    export $(grep -v '^#' ${ENV_FILE} | xargs)
  fi
}

#
# write s3 variables to file
#
write_s3_env_vars () {

  echo "ACCESS_KEY_ID=${ACCESS_KEY_ID}" > ${ENV_FILE}
  echo "SECRET_ACCESS_KEY=${SECRET_ACCESS_KEY}" >> ${ENV_FILE}
}

#
# asks user to input s3 variables
#
ask_s3_env_vars () {

  if [ -z "${ACCESS_KEY_ID}" ]
  then
    read -p 'Enter your Access Key ID: ' ACCESS_KEY_ID
    export ACCESS_KEY_ID
  fi
  if [ -z "${SECRET_ACCESS_KEY}" ]
  then
    read -p  'Enter your Secret Access Key: ' SECRET_ACCESS_KEY
    export SECRET_ACCESS_KEY
  fi
}

#
# check to see if s3 variables exist.  Ask use for them if they don't exist
#
check_s3_env_vars () {

  while true
  do
    if [ -z "${ACCESS_KEY_ID}" ] || [ -z "${SECRET_ACCESS_KEY}" ]
    then
      ask_s3_env_vars
    else
      break
    fi
  done
}

#
# Main Program
#
if [ $# -gt 1 ] || [ $# -lt 1 ]
then
  echo ""
  echo "ERROR! Wrong # of command line arguements"
  echo ""
  echo "USAGE:  $0 <S3 URL>"
  echo ""
  echo "  <S3 URL>       completed URL in the format of <access type>://<hostname>/<vault>/<object>"
  echo ""
  echo "  <access type>  either http or https"
  echo "  <hostname>     either hostame or ip address of accesser (or load balancer)"
  echo "  <vault>        name of the vault you wish to access"
  echo "  <object>       name of object in ICOS to remove"
  echo ""
  echo "  NOTE:  The system will prompt you for your S3 credentials and store them in the file .env"
  echo "         This will allow you to share the S3 credentials between scripts and store them for future use"
  echo ""
  exit 1 
else 

  # load the s3 keys if they exist
  load_s3_env_vars
  # check for the s3 keys and prompt if you don't have them
  check_s3_env_vars
  # write the s3 keys
  write_s3_env_vars

  URL=${1}
  OBJECT=`basename ${URL}`
  TEMP_URL=`dirname ${URL}`
  HOST_URL=`dirname ${TEMP_URL}`
  ACCESSER=`basename ${HOST_URL}`
  VAULT=`basename ${TEMP_URL}`
  resource="/${VAULT}/${OBJECT}"

  contentType='application/x-compressed-tar'
  dateValue=`date -R`

  stringToSign="DELETE\n\n${contentType}\n${dateValue}\n${resource}"
  s3Key=${ACCESS_KEY_ID}
  s3Secret=${SECRET_ACCESS_KEY}
  signature=`echo -en ${stringToSign} | openssl sha1 -hmac ${s3Secret} -binary | base64`
  OUTPUT=`curl -k -X DELETE \
    -H "Host: ${ACCESSER}" \
    -H "Date: ${dateValue}" \
    -H "Content-Type: ${contentType}" \
    -H "Authorization: AWS ${s3Key}:${signature}" \
    ${URL} 2>&1`
  IS_ERROR=`echo ${OUTPUT}| grep -i Error`
  if [ ! -z "${IS_ERROR}" ]
  then
    echo ""
    echo "THERE WAS AN ERROR"
    echo ""
    echo ${OUTPUT} | sed -e 's_>_&\
_g'
    exit 1
  else
    echo ""
    echo "OPERATION WAS SUCCESSFUL"
    echo ""
  fi
fi