code optimization

lib/orders/H004/signer.js

@@ -0,0 +1,50 @@
+
+'use strict';
+
+// const crypto = require('crypto');
+const Crypto = require('../../crypto/Crypto');
+
+const { DOMParser, XMLSerializer } = require('xmldom');
+const xpath = require('xpath');
+const C14n = require('xml-crypto/lib/c14n-canonicalization').C14nCanonicalization;
+
+const digest = (doc) => {
+	// get the xml node, where the digested value is supposed to be
+	const nodeDigestValue = doc.getElementsByTagName('ds:DigestValue')[0];
+
+	// canonicalize the node that has authenticate='true' attribute
+	const contentToDigest = xpath.select("//*[@authenticate='true']", doc)
+		.map(x => new C14n().process(x)).join('');
+
+	// fix the canonicalization
+	const fixedContent = contentToDigest.replace(/xmlns="urn:org:ebics:H004"/g, 'xmlns="urn:org:ebics:H004" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"');
+
+	if (nodeDigestValue)
+		nodeDigestValue.textContent = Crypto.digestWithHash(fixedContent).toString('base64').trim();
+
+	return doc;
+};
+
+const sign = (doc, key) => {
+	const nodeSignatureValue = doc.getElementsByTagName('ds:SignatureValue')[0];
+
+	if (nodeSignatureValue) {
+		const select = xpath.useNamespaces({ ds: 'http://www.w3.org/2000/09/xmldsig#' });
+		const contentToSign = (new C14n().process(select('//ds:SignedInfo', doc)[0])).replace('xmlns:ds="http://www.w3.org/2000/09/xmldsig#"', 'xmlns="urn:org:ebics:H004" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"');
+
+		nodeSignatureValue.textContent = Crypto.privateSign(key, contentToSign); // this.keys.x().key.sign(contentToSign, 'base64');
+	}
+
+	return doc;
+};
+
+const toXML = doc => new XMLSerializer().serializeToString(doc);
+
+module.exports = {
+	sign(data, keys) {
+		const keyX = keys.x();
+		const doc = new DOMParser().parseFromString(data, 'text/xml');
+
+		return toXML(sign(digest(doc), keyX));
+	},
+};