React Native

XML Inclusive Canonicalization

See more XML Digital Signatures Examples

Demonstrates how to convert XML to the Inclusive XML Canonicalization form as specified in http://www.w3.org/TR/xml-c14n/ React Native

import { Http, StringBuilder, XmlDSig } from '@chilkat/react-native'

async function chilkatExample() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // The XML digital signature verification class provides utility methods for
  // XML canonicalization.  This example demonstrates how to do inclusive XML canonicalization.

  const http = new Http();
  const sbXml = new StringBuilder();
  const canon = new XmlDSig();

  // Use inclusive XML canonicalization.
  let canonVersion = 'C14N';
  const withComments = false;

  const url = 'https://www.chilkatsoft.com/exampleData/c14n/test7.xml';
  await http.quickGetSbAsync(url, sbXml);

  // This is the input XML:
  // The XML comment is referring to when exclusive XML canonicalization is applied.  With inclusive canonicalization, the namespace nodes
  // are kept, as we'll see below..

  // <doc>
  // <!-- A namespace node N is ignored if the nearest ancestor element of the node's parent element that is in the node-set has a namespace node in the node-set with the same local name and value as N. -->
  // 	<animal xmlns:aa="https://www.animal.com/">
  // 		<reptile xmlns:bb="https://www.reptile.com/">
  //   			<lizard xmlns="" type="african fat tailed" abc="xyz" xmlns:aa="https://www.animal.com/" />
  //   			<snake type="poisonous rattler" xmlns:bb="https://www.reptile.com/" >
  //   			</snake>
  //   		</reptile>
  //   	</animal>
  // </doc>

  const xmlInclCanon = canon.canonicalizeXml(sbXml.getAsString(), canonVersion, withComments);
  console.log(xmlInclCanon);

  // The C14N (inclusive) canonicalization is:

  // <doc>
  // 
  // 	<animal xmlns:aa="https://www.animal.com/">
  // 		<reptile xmlns:bb="https://www.reptile.com/">
  //   			<lizard abc="xyz" type="african fat tailed"></lizard>
  //   			<snake type="poisonous rattler">
  //   			</snake>
  //   		</reptile>
  //   	</animal>
  // </doc>

  // To see the difference, let's do exclusive canonicalization..
  canonVersion = 'EXCL_C14N';

  const xmlExclCanon = canon.canonicalizeXml(sbXml.getAsString(), canonVersion, withComments);
  console.log(xmlExclCanon);

  // // The C14N (exclusive) canonicalization is:
  // 
  // <doc>
  // 
  // 	<animal>
  // 		<reptile>
  //   			<lizard abc="xyz" type="african fat tailed"></lizard>
  //   			<snake type="poisonous rattler">
  //   			</snake>
  //   		</reptile>
  //   	</animal>
  // </doc>
}