#!/bin/bash
    #

    set -e

    export PATH="$PATH:/usr/local/bin"

    usage()
    {
    cat << EOF
    usage: $0 options

    This Script Dumps All Mongo Databases, Tars Them And Sends Them To Am Amazon S3 Bucket

    OPTIONS:
       -k      AWS Access Key
       -s      AWS Secret Key
       -r      S3 Region
       -b      S3 Bucket Name
       -f      S3 Folder Name / Tree
    EOF
    }

    AWS_ACCESS_KEY=
    AWS_SECRET_KEY=
    S3_REGION=
    S3_BUCKET=
    S3_FOLDER=

    while getopts “ht:k:s:r:b:f:” OPTION
    do
      case $OPTION in
        h)
          usage
          exit 1
          ;;
        k)
          AWS_ACCESS_KEY=$OPTARG
          ;;
        s)
          AWS_SECRET_KEY=$OPTARG
          ;;
        r)
          S3_REGION=$OPTARG
          ;;
        b)
          S3_BUCKET=$OPTARG
          ;;
        f)
          S3_FOLDER=$OPTARG
          ;;
        ?)
          usage
          exit
        ;;
      esac
    done

    if [[ -z $AWS_ACCESS_KEY ]] || [[ -z $AWS_SECRET_KEY ]] || [[ -z $S3_REGION ]] || [[ -z $S3_BUCKET ]] || [[ -z $S3_FOLDER ]]
    then
      usage
      exit 1
    fi

    # Get CWD
    DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
    echo $DIR
    DATE=$(date -u "+%F-%H%M%S")
    FILE_NAME="backup-$DATE"
    ARCHIVE_NAME="$FILE_NAME.tar.gz"

    # Dump All Databases And Tar Them
    mongodump --out $DIR/backup/$FILE_NAME
    tar -C $DIR/backup/ -zcvf $DIR/backup/$ARCHIVE_NAME $FILE_NAME/

    #Remove Temp Files
    rm -r $DIR/backup/$FILE_NAME

    #Build S3 Request + Signature
    HEADER_DATE=$(date -u "+%a, %d %b %Y %T %z")
    CONTENT_MD5=$(openssl dgst -md5 -binary $DIR/backup/$ARCHIVE_NAME | openssl enc -base64)
    CONTENT_TYPE="application/x-tar"
    STRING_TO_SIGN="PUT\n$CONTENT_MD5\n$CONTENT_TYPE\n$HEADER_DATE\n/$S3_BUCKET/$S3_FOLDER/$ARCHIVE_NAME"
    SIGNATURE=$(echo -e -n $STRING_TO_SIGN | openssl dgst -sha1 -binary -hmac $AWS_SECRET_KEY | openssl enc -base64)

    #Upload To S3
    curl -X PUT \
    --header "Host: $S3_BUCKET.s3.amazonaws.com" \
    --header "Date: $HEADER_DATE" \
    --header "content-type: $CONTENT_TYPE" \
    --header "Content-MD5: $CONTENT_MD5" \
    --header "Authorization: AWS $AWS_ACCESS_KEY:$SIGNATURE" \
    --upload-file $DIR/backup/$ARCHIVE_NAME \
    https://$S3_BUCKET.s3.amazonaws.com/$S3_FOLDER/$ARCHIVE_NAME