Upload a blob to Azure

upload-blob

#!/usr/bin/env bash

if [[ $# != 3 ]]; then
  echo "Cowardly refusing to run without exactly three arguments"
  echo "Syntax: $0 key-string container-url file"
  exit 1
fi

API_VERSION="2015-02-21"
DATE=$(TZ=GMT date +"%a, %d %b %Y %T %Z")

KEY=$1
URL=$2
FILE=$3

FILE_LENGTH=$(wc --bytes < $FILE)
FILE_TYPE=$(file --mime-type -b $FILE)
FILE_MD5=$(md5sum -b $FILE | awk '{ print $1 }')

MS_DATE="x-ms-date:$DATE"
MS_VERSION="x-ms-version:$API_VERSION"
MS_BLOB_TYPE="x-ms-blob-type:BlockBlob"

ACCOUNT=$(echo -n $URL|sed -r 's|https://([^.]*)\..*|\1|')
CONTAINER=$(echo -n $URL|sed -r 's|.*\.net/(.*)|\1|')

CANHEADERS="${MS_BLOB_TYPE}\n${MS_DATE}\n${MS_VERSION}"
CANRESOURCE="/$ACCOUNT/$CONTAINER/$FILE"

SIGSTRING="PUT\n\n\n$FILE_LENGTH\n\n$FILE_TYPE\n\n\n\n\n\n\n$CANHEADERS\n${CANRESOURCE}"

SIGNATURE=$(echo -en "$SIGSTRING" | openssl dgst -sha256 -mac HMAC -macopt "hexkey:$(echo -n $KEY|base64 -d -w0 | xxd -p -c256)" -binary | base64 -w0)

curl -X PUT -sLk $URL/$FILE -H "Authorization: SharedKey $ACCOUNT:$SIGNATURE" -H "$MS_DATE" -H "$MS_VERSION" -H "$MS_BLOB_TYPE" -H "Content-Type: $FILE_TYPE" -T $FILE