Created
November 20, 2014 18:49
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Cloudformation metadata API Ruby code
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require 'net/http' | |
require 'base64' | |
require 'json' | |
module Cfn | |
class << self | |
def instance_identity_document() | |
Net::HTTP.get(URI('http://169.254.169.254/latest/dynamic/instance-identity/document')) | |
end | |
def instance_identity_signature() | |
Net::HTTP.get(URI('http://169.254.169.254/latest/dynamic/instance-identity/signature')) | |
end | |
def cfn_authorization_header() | |
document = Base64.strict_encode64(instance_identity_document) | |
signature = instance_identity_signature.gsub("\n", '') | |
"CFN_V1 #{document}:#{signature}" | |
end | |
def cfn_metadata(stack_name, logical_resource_id, region='us-east-1') | |
http = Net::HTTP.start("cloudformation.#{region}.amazonaws.com", 443, use_ssl: true) | |
resp = http.get( | |
'/?' + URI.encode_www_form( | |
{ | |
'Action' => 'DescribeStackResource', | |
'Version' => '2010-05-15', | |
'ContentType' => 'JSON', | |
'StackName' => stack_name, | |
'LogicalResourceId' => logical_resource_id | |
} | |
), | |
{ | |
'Authorization' => cfn_authorization_header | |
} | |
) | |
body = JSON.parse(resp.body) | |
metadata = body['DescribeStackResourceResponse']['DescribeStackResourceResult']['StackResourceDetail']['Metadata'] | |
if metadata.nil? | |
{} | |
else | |
JSON.parse(metadata) | |
end | |
end | |
end | |
end |
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