(Node.js) XML Inclusive Canonicalization

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

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

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.

    var http = new chilkat.Http();
    var sbXml = new chilkat.StringBuilder();
    var canon = new chilkat.XmlDSig();

    // Use inclusive XML canonicalization.
    var canonVersion = "C14N";
    var withComments = false;

    var url = "https://www.chilkatsoft.com/exampleData/c14n/test7.xml";
    var success = http.QuickGetSb(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>

    var 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";

    var 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>

}

chilkatExample();