xpath

To help you get started, we've collected the most common ways that xpath is being used within popular public projects.

socialtables / saml-protocol / test / sp-security-checklist.js View on Github

const chai = require("chai");
const chaiAsPromised = require("chai-as-promised");
chai.use(chaiAsPromised);
const should = chai.should(); // eslint-disable-line no-unused-vars

const xmldom = require("xmldom");
const xpath  = require("xpath");
const entityFixtures = require("./fixtures/entities");
const ModelStub      = require("./fixtures/model-stub");
//const samlFixtures   = require("./fixtures/saml");
const credentials = require("../lib/util/credentials");
const randomID    = require("../lib/util/random-id");
const signing     = require("../lib/util/signing");
const errors      = require("../lib/errors");
const namespaces  = require("../lib/namespaces");
const select      = xpath.useNamespaces(namespaces);
const moment      = require("moment");

/**
 * Tests for SP request construction and response handling for the
 * security-conscious. The protocol binding layer is tested seperately, as
 * its functionality is shared by both IDPs and SPs.
 */
describe("Service Provider security checklist", function() {

	const requestConstruction = require("../lib/request-construction");
	const responseConstruction = require("../lib/response-construction");
	const responseHandling = require("../lib/response-handling");

	let sp = entityFixtures.simpleSPWithCredentials;
	let idp = entityFixtures.simpleIDPWithCredentials;
	const idpWithLatency = entityFixtures.simpleIDPWithLatency;

View more ways to use xpath

xpath

DOM 3 XPath 1.0 implemention and helper for JavaScript, with node.js support.

Originally written by Cameron McCormack (blog).

Additional contributions from
Yaron Naveh (blog)
goto100
Thomas Weinert
Jimmy Rishe
and others

Install

Install with npm:

npm install xpath

xpath is xml engine agnostic but we recommend xmldom:

npm install @xmldom/xmldom

API Documentation

Can be found here. See below for example usage.

Your first xpath:

var xpath = require('xpath');
var dom = require('@xmldom/xmldom').DOMParser;

var xml = "<title>Harry Potter</title>";
var doc = new dom().parseFromString(xml, 'text/xml');
var nodes = xpath.select("//title", doc);

console.log(nodes[0].localName + ": " + nodes[0].firstChild.data);
console.log("Node: " + nodes[0].toString());

➡

title: Harry Potter
Node: <title>Harry Potter</title>

Alternatively

Using the same interface you have on modern browsers (MDN)

var node = null;
var xml = "<title>Harry Potter</title>";
var doc = new dom().parseFromString(xml, 'text/xml');
var result = xpath.evaluate(
    "/book/title",            // xpathExpression
    doc,                        // contextNode
    null,                       // namespaceResolver
    xpath.XPathResult.ANY_TYPE, // resultType
    null                        // result
);

node = result.iterateNext();
while (node) {
    console.log(node.localName + ": " + node.firstChild.data);
    console.log("Node: " + node.toString());

    node = result.iterateNext();
}

➡

title: Harry Potter
Node: <title>Harry Potter</title>

Evaluate string values directly:

var xml = "<title>Harry Potter</title>";
var doc = new dom().parseFromString(xml, 'text/xml');
var title = xpath.select("string(//title)", doc);

console.log(title);

➡

Harry Potter

Namespaces

var xml = "<title xmlns="myns">Harry Potter</title>";
var doc = new dom().parseFromString(xml, 'text/xml');
var node = xpath.select("//*[local-name(.)='title' and namespace-uri(.)='myns']", doc)[0];

console.log(node.namespaceURI);

➡

myns

Namespaces with easy mappings

var xml = "Harry Potter"
var select = xpath.useNamespaces({"bookml": "https://example.com/book"});

console.log(select('//bookml:title/text()', doc)[0].nodeValue);

➡

Harry Potter

Default namespace with mapping

var xml = "<title>Harry Potter</title>"
var select = xpath.useNamespaces({"bookml": "https://example.com/book"});

console.log(select('//bookml:title/text()', doc)[0].nodeValue);

➡

Harry Potter

Attributes

var xml = "<title>Harry Potter</title>";
var doc = new dom().parseFromString(xml, 'text/xml');
var author = xpath.select1("/book/@author", doc).value;

console.log(author);

➡

J. K. Rowling

License

MIT