n8n/packages/workflow/test/Expression.test.ts

/**
 * @jest-environment jsdom
 */

import { DateTime, Duration, Interval } from 'luxon';
import { Workflow } from '@/Workflow';
import * as Helpers from './Helpers';
import type { ExpressionTestEvaluation, ExpressionTestTransform } from './ExpressionFixtures/base';
import { baseFixtures } from './ExpressionFixtures/base';
import type { INodeExecutionData } from '@/Interfaces';
import { extendSyntax } from '@/Extensions/ExpressionExtension';
import { ExpressionError } from '@/errors/expression.error';
import { setDifferEnabled, setEvaluator } from '@/ExpressionEvaluatorProxy';
import { workflow } from './ExpressionExtensions/Helpers';

setDifferEnabled(true);

for (const evaluator of ['tmpl', 'tournament'] as const) {
	setEvaluator(evaluator);
	describe(`Expression (with ${evaluator})`, () => {
		describe('getParameterValue()', () => {
			const nodeTypes = Helpers.NodeTypes();
			const workflow = new Workflow({
				id: '1',
				nodes: [
					{
						name: 'node',
						typeVersion: 1,
						type: 'test.set',
						id: 'uuid-1234',
						position: [0, 0],
						parameters: {},
					},
				],
				connections: {},
				active: false,
				nodeTypes,
			});
			const expression = workflow.expression;

			const evaluate = (value: string) =>
				expression.getParameterValue(value, null, 0, 0, 'node', [], 'manual', {});

			it('should not be able to use global built-ins from denylist', () => {
				expect(evaluate('={{document}}')).toEqual({});
				expect(evaluate('={{window}}')).toEqual({});

				expect(evaluate('={{Window}}')).toEqual({});
				expect(evaluate('={{globalThis}}')).toEqual({});
				expect(evaluate('={{self}}')).toEqual({});

				expect(evaluate('={{alert}}')).toEqual({});
				expect(evaluate('={{prompt}}')).toEqual({});
				expect(evaluate('={{confirm}}')).toEqual({});

				expect(evaluate('={{eval}}')).toEqual({});
				expect(evaluate('={{uneval}}')).toEqual({});
				expect(evaluate('={{setTimeout}}')).toEqual({});
				expect(evaluate('={{setInterval}}')).toEqual({});
				expect(evaluate('={{Function}}')).toEqual({});

				expect(evaluate('={{fetch}}')).toEqual({});
				expect(evaluate('={{XMLHttpRequest}}')).toEqual({});

				expect(evaluate('={{Promise}}')).toEqual({});
				expect(evaluate('={{Generator}}')).toEqual({});
				expect(evaluate('={{GeneratorFunction}}')).toEqual({});
				expect(evaluate('={{AsyncFunction}}')).toEqual({});
				expect(evaluate('={{AsyncGenerator}}')).toEqual({});
				expect(evaluate('={{AsyncGeneratorFunction}}')).toEqual({});

				expect(evaluate('={{WebAssembly}}')).toEqual({});

				expect(evaluate('={{Reflect}}')).toEqual({});
				expect(evaluate('={{Proxy}}')).toEqual({});

				expect(() => evaluate('={{constructor}}')).toThrowError(
					new ExpressionError('Cannot access "constructor" due to security concerns'),
				);

				expect(evaluate('={{escape}}')).toEqual({});
				expect(evaluate('={{unescape}}')).toEqual({});
			});

			it('should be able to use global built-ins from allowlist', () => {
				expect(evaluate('={{new Date()}}')).toBeInstanceOf(Date);
				expect(evaluate('={{DateTime.now().toLocaleString()}}')).toEqual(
					DateTime.now().toLocaleString(),
				);

				jest.useFakeTimers({ now: new Date() });
				expect(evaluate('={{Interval.after(new Date(), 100)}}')).toEqual(
					Interval.after(new Date(), 100),
				);
				jest.useRealTimers();

				expect(evaluate('={{Duration.fromMillis(100)}}')).toEqual(Duration.fromMillis(100));

				expect(evaluate('={{new Object()}}')).toEqual(new Object());

				expect(evaluate('={{new Array()}}')).toEqual([]);
				expect(evaluate('={{new Int8Array()}}')).toEqual(new Int8Array());
				expect(evaluate('={{new Uint8Array()}}')).toEqual(new Uint8Array());
				expect(evaluate('={{new Uint8ClampedArray()}}')).toEqual(new Uint8ClampedArray());
				expect(evaluate('={{new Int16Array()}}')).toEqual(new Int16Array());
				expect(evaluate('={{new Uint16Array()}}')).toEqual(new Uint16Array());
				expect(evaluate('={{new Int32Array()}}')).toEqual(new Int32Array());
				expect(evaluate('={{new Uint32Array()}}')).toEqual(new Uint32Array());
				expect(evaluate('={{new Float32Array()}}')).toEqual(new Float32Array());
				expect(evaluate('={{new Float64Array()}}')).toEqual(new Float64Array());
				expect(evaluate('={{new BigInt64Array()}}')).toEqual(new BigInt64Array());
				expect(evaluate('={{new BigUint64Array()}}')).toEqual(new BigUint64Array());

				expect(evaluate('={{new Map()}}')).toEqual(new Map());
				expect(evaluate('={{new WeakMap()}}')).toEqual(new WeakMap());
				expect(evaluate('={{new Set()}}')).toEqual(new Set());
				expect(evaluate('={{new WeakSet()}}')).toEqual(new WeakSet());

				expect(evaluate('={{new Error()}}')).toEqual(new Error());
				expect(evaluate('={{new TypeError()}}')).toEqual(new TypeError());
				expect(evaluate('={{new SyntaxError()}}')).toEqual(new SyntaxError());
				expect(evaluate('={{new EvalError()}}')).toEqual(new EvalError());
				expect(evaluate('={{new RangeError()}}')).toEqual(new RangeError());
				expect(evaluate('={{new ReferenceError()}}')).toEqual(new ReferenceError());
				expect(evaluate('={{new URIError()}}')).toEqual(new URIError());

				expect(evaluate('={{Intl}}')).toEqual(Intl);

				expect(evaluate('={{new String()}}')).toEqual(new String());
				expect(evaluate("={{new RegExp('')}}")).toEqual(new RegExp(''));

				expect(evaluate('={{Math}}')).toEqual(Math);
				expect(evaluate('={{new Number()}}')).toEqual(new Number());
				expect(evaluate("={{BigInt('1')}}")).toEqual(BigInt('1'));
				expect(evaluate('={{Infinity}}')).toEqual(Infinity);
				expect(evaluate('={{NaN}}')).toEqual(NaN);
				expect(evaluate('={{isFinite(1)}}')).toEqual(isFinite(1));
				expect(evaluate('={{isNaN(1)}}')).toEqual(isNaN(1));
				expect(evaluate("={{parseFloat('1')}}")).toEqual(parseFloat('1'));
				expect(evaluate("={{parseInt('1', 10)}}")).toEqual(parseInt('1', 10));

				expect(evaluate('={{JSON.stringify({})}}')).toEqual(JSON.stringify({}));
				expect(evaluate('={{new ArrayBuffer(10)}}')).toEqual(new ArrayBuffer(10));
				expect(evaluate('={{new SharedArrayBuffer(10)}}')).toEqual(new SharedArrayBuffer(10));
				expect(evaluate('={{Atomics}}')).toEqual(Atomics);
				expect(evaluate('={{new DataView(new ArrayBuffer(1))}}')).toEqual(
					new DataView(new ArrayBuffer(1)),
				);

				expect(evaluate("={{encodeURI('https://google.com')}}")).toEqual(
					encodeURI('https://google.com'),
				);
				expect(evaluate("={{encodeURIComponent('https://google.com')}}")).toEqual(
					encodeURIComponent('https://google.com'),
				);
				expect(evaluate("={{decodeURI('https://google.com')}}")).toEqual(
					decodeURI('https://google.com'),
				);
				expect(evaluate("={{decodeURIComponent('https://google.com')}}")).toEqual(
					decodeURIComponent('https://google.com'),
				);

				expect(evaluate('={{Boolean(1)}}')).toEqual(Boolean(1));
				expect(evaluate('={{Symbol(1).toString()}}')).toEqual(Symbol(1).toString());
			});

			it('should not able to do arbitrary code execution', () => {
				const testFn = jest.fn();
				Object.assign(global, { testFn });
				expect(() => evaluate("={{ Date['constructor']('testFn()')()}}")).toThrowError(
					new ExpressionError('Cannot access "constructor" due to security concerns'),
				);
				expect(testFn).not.toHaveBeenCalled();
			});
		});

		describe('Test all expression value fixtures', () => {
			const expression = workflow.expression;

			const evaluate = (value: string, data: INodeExecutionData[]) => {
				const itemIndex = data.length === 0 ? -1 : 0;
				return expression.getParameterValue(value, null, 0, itemIndex, 'node', data, 'manual', {});
			};

			for (const t of baseFixtures) {
				if (!t.tests.some((test) => test.type === 'evaluation')) {
					continue;
				}
				test(t.expression, () => {
					const evaluationTests = t.tests.filter(
						(test): test is ExpressionTestEvaluation => test.type === 'evaluation',
					);

					for (const test of evaluationTests) {
						const input = test.input.map((d) => ({ json: d })) as any;

						if ('error' in test) {
							expect(() => evaluate(t.expression, input)).toThrowError(test.error);
						} else {
							expect(evaluate(t.expression, input)).toStrictEqual(test.output);
						}
					}
				});
			}
		});

		describe('Test all expression transform fixtures', () => {
			for (const t of baseFixtures) {
				if (!t.tests.some((test) => test.type === 'transform')) {
					continue;
				}
				test(t.expression, () => {
					for (const test of t.tests.filter(
						(test): test is ExpressionTestTransform => test.type === 'transform',
					)) {
						const expr = t.expression;
						expect(extendSyntax(expr, test.forceTransform)).toEqual(test.result ?? expr);
					}
				});
			}
		});
	});
}