Class: CloudStackHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/cloudstack_helper.rb

Constant Summary collapse

CONFIGURABLE_ATTRIBUTES = 
[
  :response,
  :secret_key,
  :api_key,
  :api_url
]

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ CloudStackHelper

Returns a new instance of CloudStackHelper.



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# File 'lib/cloudstack_helper.rb', line 16

def initialize(options = {})
  CONFIGURABLE_ATTRIBUTES.each do |attribute_name|
    self.send("#{attribute_name}=", options[attribute_name]) if options.has_key?(attribute_name)
  end
end

Instance Method Details

#generate_params_str(params) ⇒ Object 



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# File 'lib/cloudstack_helper.rb', line 50

def generate_params_str(params)
  unless params[:response]
    params[:response] = @response if @response
  end
  params[:apikey] = @api_key
  params[:signature] = generate_signature(params.clone)
  str = parameterize(params)
end

#generate_signature(params) ⇒ Object

To generate the signature:

  1. For each field-value pair (as separated by a ‘&’) in the Command String, URL encode each value so that it can be safely sent via HTTP GET.

    NOTE: Make sure all spaces are encoded as “%20” rather than “+”.

  2. Lower case the entire Command String and sort it alphabetically via the field for each field-value pair.

  3. Take the sorted Command String and run it through the HMAC SHA-1 hashing algorithm with the user’s Secret Key.

  4. Base64 encode the resulting byte array in UTF-8 so that it can be safely transmitted via HTTP.



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# File 'lib/cloudstack_helper.rb', line 29

def generate_signature(params)
  params.each { |k,v| params[k] = CGI.escape(v).gsub('+', '%20').downcase }
  sorted_params = params.sort_by{|key,value| key.to_s}

  data = parameterize(sorted_params, false)

  hash = OpenSSL::HMAC.digest('sha1', @secret_key, data)
  signature = Base64.b64encode(hash).chomp
end

#get(params, api_url = nil) ⇒ Object 



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# File 'lib/cloudstack_helper.rb', line 70

def get(params, api_url = nil)
  api_url ||= @api_url
  request(params, api_url, :get)
end

#parameterize(params, escape = true) ⇒ Object 



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# File 'lib/cloudstack_helper.rb', line 39

def parameterize(params, escape=true)
  params = params.collect do |k,v| 
    if escape
      "#{CGI.escape(k.to_s)}=#{CGI.escape(v.to_s)}"
    else
      "#{k}=#{v}"
    end
  end
  params.join('&')
end

#request(params, api_url, method = :get) ⇒ Object 



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# File 'lib/cloudstack_helper.rb', line 59

def request(params, api_url, method = :get)
  case method
  when :get
    url = api_url + "?" + generate_params_str(params.clone)
    response = RestClient.send(method, url)
  else
    raise "HTTP method #{method} not supported"
  end
  response    
end