direct access meta-data api in havana

direct-access-meta-data.py

    expected_signature = hmac.new(
        CONF.neutron_metadata_proxy_shared_secret,
        instance_id,
        hashlib.sha256).hexdigest()
        
    # grep shared_secret /etc/nova/nova.conf
    neutron_metadata_proxy_shared_secret=deadbeef2eb84d8d
    
    Python 2.7.5 (default, Nov 12 2013, 16:18:42) 
    [GCC 4.8.2 20131017 (Red Hat 4.8.2-1)] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import hmac
    >>> import hashlib
    >>> hmac.new('deadbeef2eb84d8d',
    >>> '32d0524b-314d-4594-b3a3-607e3f2354f8',
    >>> hashlib.sha256).hexdigest()
    '6bcbe3885ae7efc49cef35b438efe29c95501f4a720a0c53ed000d8fcf04a605'

    $ curl \
    -H 'x-instance-id: 32d0524b-314d-4594-b3a3-607e3f2354f8' \
    -H 'x-tenant-id: 28a490a0f8b28800181ce490a74df8d2' \
    -H 'x-instance-id-signature: 6bcbe3885ae7efc49cef35b438efe29c95501f4a720a0c53ed000d8fcf04a605' \
    http://localhost:8775/latest/meta-data
    
    ami-id
    ami-launch-index
    ami-manifest-path
    block-device-mapping/
    hostname
    instance-action
    instance-id
    instance-type
    kernel-id
    local-hostname
    local-ipv4
    placement/
    public-hostname
    public-ipv4
    public-keys/
    ramdisk-id
    reservation-id

references:
[1] http://blog.oddbit.com/2014/01/14/direct-access-to-nova-metadata/