CPI SOAP to REST Currency Converter with Groovy

Hello,

In this tutorial we’re gonna create a simple SOAP Currency Converter in CPI:

Using a REST API data source for the conversions, read more about it here:  https://exchangeratesapi.io/

Basically in this FREE API, you need to pass the base currency on the URL query parameter, like this: https://api.ratesapi.io/api/latest?base=USD. The result:

{
  "base": "USD",
  "rates": {
    "GBP": 0.8098223235,
    "HKD": 7.7519817768,
    "IDR": 14754.9977220957,
    "ILS": 3.5118906606,
    "DKK": 6.7934396355,
    "INR": 75.5599088838,
    "CHF": 0.9658314351,
    "MXN": 22.150523918,
    "CZK": 24.667881549,
    "SGD": 1.4177676538,
    "THB": 31.8797266515,
    "HRK": 6.9102505695,
    "EUR": 0.9111617312,
    "MYR": 4.3634624146,
    "NOK": 9.9264692483,
    "CNY": 7.131571754,
    "BGN": 1.7820501139,
    "PHP": 50.4400911162,
    "PLN": 4.0552164009,
    "ZAR": 17.3712984055,
    "CAD": 1.3835079727,
    "ISK": 140.410022779,
    "BRL": 5.3862414579,
    "RON": 4.413667426,
    "NZD": 1.6143052392,
    "TRY": 6.7438724374,
    "JPY": 107.444191344,
    "RUB": 70.8422779043,
    "KRW": 1232.1002277904,
    "USD": 1.0,
    "AUD": 1.5069703872,
    "HUF": 318.5421412301,
    "SEK": 9.6184965831
  },
  "date": "2020-05-26"
}

So basically we need 2 input fields (Currency from and Currency To) and 1 response field (Rate value). For that, i’ve created a simple WSDL file using Eclipse and used on the iFlow, you can get it here:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<wsdl:definitions xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://www.example.org/CPI_DEMO/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="CPI_DEMO" targetNamespace="http://www.example.org/CPI_DEMO/">
  <wsdl:types>
    <xsd:schema targetNamespace="http://www.example.org/CPI_DEMO/">
      <xsd:element name="GetCurrency">
        <xsd:complexType>
          <xsd:sequence>
          	<xsd:element name="FROM" type="xsd:string" />
          	<xsd:element name="TO" type="xsd:string"></xsd:element>
          </xsd:sequence>
        </xsd:complexType>
      </xsd:element>
      <xsd:element name="GetCurrencyResponse">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element name="VALUE" type="xsd:string"/>
          </xsd:sequence>
        </xsd:complexType>
      </xsd:element>
    </xsd:schema>
  </wsdl:types>
  <wsdl:message name="GetCurrencyRequest">
    <wsdl:part element="tns:GetCurrency" name="parameters"/>
  </wsdl:message>
  <wsdl:message name="GetCurrencyResponse">
    <wsdl:part element="tns:GetCurrencyResponse" name="parameters"/>
  </wsdl:message>
  <wsdl:portType name="CPI_DEMO">
    <wsdl:operation name="GetCurrency">
      <wsdl:input message="tns:GetCurrencyRequest"/>
      <wsdl:output message="tns:GetCurrencyResponse"/>
    </wsdl:operation>
  </wsdl:portType>
  <wsdl:binding name="CPI_DEMOSOAP" type="tns:CPI_DEMO">
    <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
    <wsdl:operation name="GetCurrency">
      <soap:operation soapAction="http://www.example.org/CPI_DEMO/GetCurrency"/>
      <wsdl:input>
        <soap:body use="literal"/>
      </wsdl:input>
      <wsdl:output>
        <soap:body use="literal"/>
      </wsdl:output>
    </wsdl:operation>
  </wsdl:binding>
  <wsdl:service name="CPI_DEMO">
    <wsdl:port binding="tns:CPI_DEMOSOAP" name="CPI_DEMOSOAP">
      <soap:address location="http://www.example.org/"/>
    </wsdl:port>
  </wsdl:service>
</wsdl:definitions>

So let’s do it! Create an iFlow, in the end it should look like these:

So create a SOAP sender connection, using the WSDL above:

Next, a Content Modifier to capture both input values:

Next, a Request Reply HTTP to the Receiver (API), passing the Query parameter like this:

Next, a Groovy Script to “map” the return value to the desired SOAP response (using JSON Slurper):

import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;
import groovy.json.*;
def Message processData(Message message) {
        map = message.getProperties();
        currto = map.get("CURRFROM");
        def body = message.getBody(String.class);  
        def jsonSlurper = new JsonSlurper();
        def list = jsonSlurper.parseText(body);
        String val = list.rates[currto];             
       message.setBody(
           "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
            "<ns0:GetCurrencyResponse xmlns:ns0=\"http://www.example.org/CPI_DEMO/\"><VALUE>" + 
            val +
            "</VALUE></ns0:GetCurrencyResponse> "
           );    
       return message;
}

And that’s it, save and deploy!

To test it, i’m using SOAPUI.

Use the WSDL to generate the Request and place your iFlow URL to make the call, and you’ll get the desired currency, exemple below from BRL to EUR:

Enjoy!

Regards.