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giskou/container_exists.sh

Created December 19, 2019 13:47
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  1. giskou created this gist Dec 19, 2019.
    32 changes: 32 additions & 0 deletions container_exists.sh
    View file
    Original file line number Diff line number Diff line change
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    #!/usr/bin/env bash
    # vim: ai ts=2 sw=2 et sts=2 ft=sh

    set -euf -o pipefail

    storage_account="$1"
    container_name="$2"
    access_key="$3"

    # HTTP Request headers
    x_ms_date_h="x-ms-date:$(TZ=GMT date "+%a, %d %h %Y %H:%M:%S %Z")"
    x_ms_version_h="x-ms-version:2019-02-02"

    # Build the signature string
    canonicalized_headers="${x_ms_date_h}\\n${x_ms_version_h}"
    canonicalized_resource="/${storage_account}/${container_name}"

    string_to_sign="GET\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n${canonicalized_headers}\\n${canonicalized_resource}\\nrestype:container"

    # Decode the Base64 encoded access key, convert to Hex.
    decoded_hex_key="$(echo -n "$access_key" | base64 -d | tr -d '\n' | xxd -p -c256 | tr -d '[:space:]')"

    # Create the HMAC signature for the Authorization header
    signature=$(printf "$string_to_sign" | openssl dgst -sha256 -mac HMAC -macopt "hexkey:$decoded_hex_key" -binary | base64 | tr -d '\n')

    authorization_header="Authorization: SharedKey $storage_account:$signature"

    curl -v \
    -H "$x_ms_date_h" \
    -H "$x_ms_version_h" \
    -H "$authorization_header" \
    "https://${storage_account}.blob.core.windows.net/${container_name}?restype=container"