Shell script to sign, upload and prove files on provendb.com

provenfiles.sh

# 
# provenFiles.sh:  Store files into a ProvenDB database using `mongofiles`
#    optionally sign using a private key
#    submit a Blockchain Proof once the files are loaded
#
# Usage: provenFiles.sh -u ProvenDBUri -k keyFile fileSpecification mongoFilesArgs
#
# Author: guy.a.harrison@gmail.com
# License: AGPL
#
DATEFORMAT="+%Y-%m-%dT%H:%M:%S.000%z"
usage() {
  if [ $# -gt 0 ];then 
    echo "`date $DATEFORMAT`" $*
  fi
  echo "Usage:"
  echo "${O} -u ProvenDBUri [-k privateKeyFile ] -f fileName"
  exit 0
}

# Check arguments

while getopts ":k:u:f:h" opt;do
  case ${opt} in 
    u ) URI=${OPTARG}
    DB=`echo $URI|cut -f1 -d'?'|cut -d'/' -f4` #NB: this relies on provendb URI being in normal format
    ;; 
    k ) KEYFILE=${OPTARG}
    ;;
    f ) FILENAME=${OPTARG}
    ;;
    h ) usage;
    ;;
  esac  
done
shift $((OPTIND -1))

[ "$FILENAME" = "" ] &&                   usage "Error: -f option must be specified"
[ "$URI" = "" ]      &&                   usage "Error: -u option must be specified"
[ -e "$FILENAME" ]   ||                   usage "File $FILENAME does not exist"
if [ "$KEYFILE" != "" ];then 
   [ -e "$KEYFILE" ] ||                   usage "keyfile $KEYFILE does not exist"
fi

if [ "$KEYFILE" != "" ];then 
  # sign the file
  echo "`date "$DATEFORMAT"` : Signing $FILENAME with $KEYFILE"
  openssl dgst -sha256 -sign $KEYFILE -out $FILENAME.sign $FILENAME
  if [ $? -ne 0 ];then
    echo "Error signing file. Is $KEYFILE really a private key file?"
    exit 1
  fi
fi

echo "`date "$DATEFORMAT"` : Uploading files to ProvenDB"
mongofiles --uri $URI --db $DB put $FILENAME|| echo "Error loading $FILENAME"
if [ "$KEYFILE" != "" ];then 
    mongofiles --uri $URI --db $DB put ${FILENAME}.sign|| echo "Error loading ${FILENAME}.sign" 
fi

echo "`date "$DATEFORMAT"` : Submitting blockchain proof"
cat >/tmp/provenfiles.$$ <<EOF
  var currentVersion=db.runCommand({getVersion:1}).version;
  var proof=db.runCommand({submitProof:currentVersion});
  print("Blockchain proof",proof.proofId,"submitted");
EOF
mongo --quiet $URI /tmp/provenfiles.$$||echo "Error submitting blockchain proof"