#!/bin/bash

# Check the version of openssl.
if [[ `openssl version` < 'OpenSSL 0.9.8e' ]]; then
  echo "openssl is too old - must be version 0.9.8e or later."
  exit 1
fi

# Set our Access Key Id, and Secret Access Key.
readonly ACCESS_KEY_ID='xxxxxxxxxxxxxxxxxxxx'
readonly SECRET_ACCESS_KEY='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

# Downloads the next document from PDF Alchemy.
# Set the DOCUMENT_ID variable on success.
function downloadNext {
  DATE=`date --rfc-2822 --utc`
  REQUEST="/$ACCESS_KEY_ID/outqueue/next"
  CLEARTEXT=`echo -e "GET\n$ACCESS_KEY_ID\n$DATE\n$REQUEST"`
  SIGNATURE=`echo -n "$CLEARTEXT" | openssl dgst -sha1 -hmac "$SECRET_ACCESS_KEY" -binary | openssl base64`
  OUT=`wget -S "--header=Date: $DATE" "--header=X-PDF-Alchemy-Signature: $SIGNATURE" "http://www.pdfalchemy.com$REQUEST" 2>&1`
  RC="$?"
  if [ "$RC" -eq 0 ]; then
    echo "$OUT" | grep '[0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\} \(.*\) - .* saved \[[0-9]\+/[0-9]\+\]$'
    DOCUMENT_ID=`echo "$OUT" | sed -ne 's/ *X-PDF-Alchemy-ID: \(.*\)/\1/gp'`
  else
    echo "$OUT" # Print all of the error output.
  fi
  return "$RC"
}

# Removes documentId from the PDF Alchemy outqueue.
function deleteDocument { # $1 => documentId.
  DATE=`date --rfc-2822 --utc`
  REQUEST="/$ACCESS_KEY_ID/outqueue/$1"
  CLEARTEXT=`echo -e "DELETE\n$ACCESS_KEY_ID\n$DATE\n$REQUEST"`
  SIGNATURE=`echo -n "$CLEARTEXT" | openssl dgst -sha1 -hmac "$SECRET_ACCESS_KEY" -binary | openssl base64`
  curl -X 'DELETE' -H "Date: $DATE" -H "X-PDF-Alchemy-Signature: $SIGNATURE" "http://www.pdfalchemy.com$REQUEST"
}

RC=0
while [ "$RC" -eq 0 ]; do
  downloadNext
  RC="$?"
  if [ "$RC" -eq 0 ]; then
    deleteDocument "$DOCUMENT_ID"
  fi
done

exit "$RC"