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render.js
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/*
* Copyright 2022 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const Eleventy = require('@11ty/eleventy');
const path = require('path');
const yaml = require('js-yaml');
const xss = require('xss').filterXSS;
const {EleventyRenderPlugin} = require('@11ty/eleventy');
const {OAuth2Client} = require('google-auth-library');
const ignorePatterns = [
'site/es/**/*',
'site/pt/**/*',
'site/ko/**/*',
'site/zh/**/*',
'site/ru/**/*',
'site/ja/**/*',
'site/fr/**/*',
'site/de/**/*',
'site/**/docs/',
'site/**/articles/',
'site/**/authors/',
'site/**/tags/',
'site/**/releases/',
'site/**/workbox/',
];
const supportedLayouts = ['layouts/blog-post.njk', 'layouts/doc-post.njk'];
const CLIENT_ID =
'636061184119-c4pof3b538r4ibs8bt6g8qdfth958nc9.apps.googleusercontent.com';
const authClient = new OAuth2Client(CLIENT_ID);
async function verifyLogin(token) {
const ticket = await authClient.verifyIdToken({
idToken: token,
audience: CLIENT_ID,
});
const payload = ticket.getPayload();
return payload && payload['sub']; // userid
}
/**
* Escapes and formats frontmatter provided by user to 11ty format.
* @param {string} inputFm Frontmatter string
*/
const parseFrontmatter = inputFm => {
const /** @type {any} */ parsedFm = yaml.load(inputFm) || {};
const date = parsedFm.date?.toISOString ? parsedFm.date : new Date();
return {
layout: xss(parsedFm.layout) || 'layouts/blog-post.njk',
date: date.toISOString().split('T')[0],
title: xss(parsedFm.title) || 'Test title TBD',
desciption: xss(parsedFm.description) || 'Test description TBD',
authors: parsedFm.authors?.map(author => xss(author)) || ['rachelandrew'],
};
};
const renderHandler = async (req, res) => {
// Check sign in
try {
const userId = await verifyLogin(req.body.t);
if (!userId) {
return res.sendStatus(401);
}
} catch (e) {
return res.sendStatus(401);
}
process.env.ELEVENTY_IGNORE_EXTENSIONS = 'true';
let fm = {};
try {
fm = parseFrontmatter(req.body.fm);
} catch (e) {
return res.status(400).send(`FrontMatter malformed: ${e}`);
}
if (!supportedLayouts.includes(fm.layout)) {
return res.status(400).send(`Unsupported layout: ${fm.layout}`);
}
const body = xss(req.body.md);
const inputPath = path.join('./site/en/preview', fm.layout);
try {
const elev = new Eleventy(inputPath, 'dist', {
configPath: '.eleventy.js',
inputDir: './site',
config: function (eleventyConfig) {
eleventyConfig.addPlugin(EleventyRenderPlugin);
eleventyConfig.addGlobalData('fm', fm);
eleventyConfig.addGlobalData('body', body);
eleventyConfig.addGlobalData('date', fm.date);
eleventyConfig.addAsyncShortcode('render', async function (str) {
const {renderTemplate} = eleventyConfig.javascriptFunctions;
// Ignore ts complaining about the magical 'this' that comes from 11ty
// @ts-ignore
const r = renderTemplate.bind(this);
// @ts-ignore
const out = await r(str, 'njk, md', this.ctx);
return out;
});
ignorePatterns.forEach(entry => {
eleventyConfig.ignores.add(entry);
});
},
});
const out = await elev.toJSON();
if (!out.length || !out[0]?.content) {
return res.status(400).send('Render failed - template not found');
}
return res.send(out[0].content);
} catch (e) {
return res.status(400).send(`Render failed. Details:\n ${e}`);
}
};
module.exports = {renderHandler};