code optimization

lib/orders/H004/response.js

@@ -0,0 +1,114 @@
+'use strict';
+
+const zlib = require('zlib');
+const crypto = require('crypto');
+const BN = require('bn.js');
+
+const Crypto = require('../../crypto/Crypto');
+
+const { DOMParser, XMLSerializer } = require('xmldom');
+const xpath = require('xpath');
+
+const DEFAULT_IV = Buffer.from(Array(16).fill(0, 0, 15));
+
+const lastChild = (node) => {
+	let y = node.lastChild;
+
+	while (y.nodeType !== 1) y = y.previousSibling;
+
+	return y;
+};
+
+module.exports = (xml, keys) => ({
+	keys,
+	doc: new DOMParser().parseFromString(xml, 'text/xml'),
+
+	isSegmented() {
+		const select = xpath.useNamespaces({ xmlns: 'urn:org:ebics:H004' });
+		const node = select('//xmlns:header/xmlns:mutable/xmlns:SegmentNumber', this.doc);
+
+		return !!node.length;
+	},
+
+	isLastSegment() {
+		const select = xpath.useNamespaces({ xmlns: 'urn:org:ebics:H004' });
+		const node = select("//xmlns:header/xmlns:mutable/*[@lastSegment='true']", this.doc);
+
+		return !!node.length;
+	},
+
+	orderData() {
+		const orderDataNode = this.doc.getElementsByTagNameNS('urn:org:ebics:H004', 'OrderData');
+
+		if (!orderDataNode.length) return {};
+
+		const orderData = orderDataNode[0].textContent;
+		const decipher = crypto.createDecipheriv('aes-128-cbc', this.transactionKey(), DEFAULT_IV).setAutoPadding(false);
+		const data = Buffer.from(decipher.update(orderData, 'base64', 'binary') + decipher.final('binary'), 'binary');
+
+		return zlib.inflateSync(data).toString();
+	},
+
+	transactionKey() {
+		const keyNodeText = this.doc.getElementsByTagNameNS('urn:org:ebics:H004', 'TransactionKey')[0].textContent;
+
+		return Crypto.privateDecrypt(this.keys.e(), Buffer.from(keyNodeText, 'base64'));
+	},
+
+	transactionId() {
+		const select = xpath.useNamespaces({ xmlns: 'urn:org:ebics:H004' });
+		const node = select('//xmlns:header/xmlns:static/xmlns:TransactionID', this.doc);
+
+		return node.length ? node[0].textContent : '';
+	},
+
+	orderId() {
+		const select = xpath.useNamespaces({ xmlns: 'urn:org:ebics:H004' });
+		const node = select('//xmlns:header/xmlns:mutable/xmlns:OrderID', this.doc);
+
+		return node.length ? node[0].textContent : '';
+	},
+
+	returnCode() {
+		const select = xpath.useNamespaces({ xmlns: 'urn:org:ebics:H004' });
+		const node = select('//xmlns:header/xmlns:mutable/xmlns:ReturnCode', this.doc);
+
+		return node.length ? node[0].textContent : '';
+	},
+
+	reportText() {
+		const select = xpath.useNamespaces({ xmlns: 'urn:org:ebics:H004' });
+		const node = select('//xmlns:header/xmlns:mutable/xmlns:ReportText', this.doc);
+
+		return node.length ? node[0].textContent : '';
+	},
+
+	bankKeys() {
+		const orderData = this.orderData();
+		if (!Object.keys(orderData).length) return {};
+
+		const doc = new DOMParser().parseFromString(orderData, 'text/xml');
+		const select = xpath.useNamespaces({ xmlns: 'urn:org:ebics:H004' });
+		const keyNodes = select('//xmlns:PubKeyValue', doc);
+		const bankKeys = {};
+
+		if (!keyNodes.length) return {};
+
+		for (let i = 0; i < keyNodes.length; i++) {
+			const type = lastChild(keyNodes[i].parentNode).textContent;
+			const modulus = xpath.select("//*[local-name(.)='Modulus']", keyNodes[i])[0].textContent;
+			const exponent = xpath.select("//*[local-name(.)='Exponent']", keyNodes[i])[0].textContent;
+
+			const mod = new BN(Buffer.from(modulus, 'base64'), 2).toBuffer();
+			const exp = new BN(Buffer.from(exponent, 'base64')).toNumber();
+
+			bankKeys[`bank${type}`] = { mod, exp };
+		}
+
+		return bankKeys;
+	},
+
+	toXML() {
+		return new XMLSerializer().serializeToString(this.doc);
+	},
+});