semantic handle creation with ruby Savon library

gistfile1.rb

the gem:
gem "savon", "~> 2.0"

the basic config:
handles_enabled: false
handle_wsdl: http://linktest.odai.yale.edu/ypls-ws/PersistentLinking?wsdl
handle_prefix: 10079.1/digcoll
handle_group: 10079.1/DIGCOLL
handle_user: 10079.1/DIGCOLL
handle_credential: *
handle_base: http://findit.library.yale.edu/catalog/


the implementing methods:
def create_handle(pid)
  if @handles_enabled == true
    logger.info("Creating handle for pid: " + pid)
    semantic_handle = pid_to_semantic_handle(pid)
    client = Savon.client(wsdl: @handle_wsdl)
    envelope = handle_soap_envelope(pid,semantic_handle)
    response = client.call(:create_batch_semantic, xml: envelope)
    if response.success? == true
      logger.info("Created handle: http://hdl.handle.net/"+semantic_handle)
      logger.info("envelope: " + envelope)
      logger.info("response: " + response.to_xml.to_s)
    else
      logger.error("Error creating handle for pid: "+pid)
      logger.error("envelope: " + envelope)
      logger.error("response: " + response.to_xml.to_s)
    end
  else
    logger.info("Handles disabled, skipping call to handle service")
  end
end

def pid_to_semantic_handle(pid)
  ns = @handle_prefix[@handle_prefix.index("/")+1,@handle_prefix.size]+":"
  if pid.include?(ns)
    return @handle_prefix + "/" + pid.gsub(ns,"")
  else
    logger.error("Handle prefix namespace "+ns+" doesn't match pid namespace of pid "+pid)
    raise "Handle prefix namespace "+ns+" doesn't match pid namespace of pid "+pid
  end
end

def handle_soap_envelope(pid,semantic_handle)
  envelope =
    "<env:Envelope xmlns:env=\"http://schemas.xmlsoap.org/soap/envelope/\">"+
    "<env:Body>"+
    "<tns:createBatchSemantic xmlns:tns=\"http://ws.ypls.odai.yale.edu/\">"+
    "<handlesToValues><map><entry>"+
    "<key>"+semantic_handle+"</key>"+
    "<value>"+@handle_base+pid+"</value>"+
    "</entry></map></handlesToValues>"+
    "<group>"+@handle_group+"</group>"+
    "<user>"+@handle_user+"</user>"+
    "<credential>"+@handle_credential+"</credential>"+
    "</tns:createBatchSemantic></env:Body></env:Envelope>"
  envelope
end