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stephenmathieson/axe-puppeteer-up-lambda.js

Created July 17, 2018 20:32
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  1. stephenmathieson created this gist Jul 17, 2018.
    75 changes: 75 additions & 0 deletions axe-puppeteer-up-lambda.js
    View file
    Original file line number Diff line number Diff line change
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    const chromium = require('chrome-aws-lambda');
    const puppeteer = require('puppeteer');
    const axeCore = require('axe-core');
    const { createServer } = require('http');
    const { parse: parseURL } = require('url');

    const { PORT = 3000 } = process.env;

    const analyze = async url => {
    let browser;
    let results;

    try {
    // Setup Puppeteer
    browser = await puppeteer.launch({
    args: chromium.args,
    headless: chromium.headless,
    executablePath: await chromium.executablePath
    });

    // Get new page
    const page = await browser.newPage();
    await page.goto(url);

    // Inject and run axe-core
    const handle = await page.evaluateHandle(`
    // Inject axe source code
    ${axeCore.source}
    // Run axe
    axe.run()
    `);

    // Get the results from `axe.run()`.
    results = await handle.jsonValue();
    // Destroy the handle & return axe results.
    await handle.dispose();
    } catch (err) {
    // Ensure we close the puppeteer connection when possible
    if (browser) {
    await browser.close();
    }

    // Re-throw
    throw err;
    }

    await browser.close();
    return results;
    };

    const server = createServer((req, res) => {
    // Ensure ?url= was provided
    const { query = {} } = parseURL(req.url, true);
    const { url } = query;
    if (!url) {
    res.writeHead(400, { 'Content-Type': 'text/plain' });
    res.end('URL required');
    return;
    }

    // Analyze the URL
    analyze(url)
    .then(results => {
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify(results, null, 2));
    })
    .catch(err => {
    console.error('Runtime error', { error: err.message, stack: err.stack });
    res.writeHead(500, { 'Content-Type': 'text/plain' });
    res.end(err.message || 'Unknown error');
    });
    });

    server.listen(PORT);