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puppeteer-server.js
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const bodyParser = require('body-parser');
const express = require('express');
const puppeteer = require('puppeteer');
const app = express();
app.use(bodyParser.json({limit: '10mb'}));
app.post('/d3/svg', function(req, res) {
const data = req.body;
if (data.scripts && data.main && data.params) {
// Render page using headless-chrome
(async () => {
var browser
try {
browser = await puppeteer.launch({headless: true, executablePath: '/usr/bin/chromium-browser'});
const page = await browser.newPage();
await page.setViewport({
width: data.params.viewport_width || 1000,
height: data.params.viewport_height || 1000,
deviceScaleFactor: 1,
});
await page.setContent(
'<html><head><meta charset="utf-8"></head><body></body></html>',
{waitUntil: 'domcontentloaded'}
);
await page.addScriptTag({path: 'd3.min.js'});
var scripts = '';
for (var i = 0; i < data.scripts.length; i++) {
scripts += '\n' + data.scripts[i];
}
var params = 'var params=JSON.parse(\'' + JSON.stringify(data.params) + '\');';
var main = data.main + '(params)(d3.select("body").node());';
await page.evaluate(scripts + params + main);
const svg = await page.evaluate(function() {return (new XMLSerializer()).serializeToString(document.querySelector('svg'));});
res.header('Content-Type', 'image/svg+xml; charset=utf-8');
res.send(svg);
} finally {
if (browser) { await browser.close(); }
}
})();
} else {
res.statusCode = 400;
res.send(
"Missing parameters. Make sure to send a valid JSON request."
);
}
});
app.post('/d3/pdf', function(req, res) {
const data = req.body;
if (data.scripts && data.main && data.params) {
// Render page using headless-chrome
(async () => {
var browser;
try {
browser = await puppeteer.launch({headless: true, executablePath: '/usr/bin/chromium-browser'});
const page = await browser.newPage();
await page.setContent(
'<html><head></head><body><div id="viewport"></div></body></html>',
{waitUntil: 'domcontentloaded'}
);
await page.addScriptTag({path: 'd3.min.js'});
// Run the script on the viewport, save as window.chart
var scripts = '';
for (var i = 0; i < data.scripts.length; i++) {
scripts += '\n' + data.scripts[i];
}
var params = 'var params=JSON.parse(\'' + JSON.stringify(data.params) + '\');';
var main = 'window.chart = ' + data.main + '(params)(d3.select("#viewport").node());';
await page.evaluate(scripts + params + main);
// Set the viewport
const width = await page.evaluate(function(){
if (window.chart && window.chart.width) return window.chart.width();
return null;
});
const height = await page.evaluate(function(){
if (window.chart && window.chart.height) return window.chart.height();
return null;
});
await page.setViewport({
width: data.params.viewport_width || width || 1000,
height: data.params.viewport_height || height || 1000,
deviceScaleFactor: 1,
});
const clipRect = await page.evaluate(function() {
return document.getElementById('viewport').getBoundingClientRect();
});
const pdf_buffer = await page.pdf({
// if we didn't get a bounding rect we need to add some
// margins ourselves so the PDF doesn't get split to
// two pages
height: clipRect.height || (height + 16),
width: clipRect.width || (width + 16)
});
const pdf = pdf_buffer.toString('base64');
// Return the PDF
res.header('Content-Type', 'application/base64');
res.header('Content-Length', pdf.length.toString());
res.send(pdf);
} finally {
if (browser) { await browser.close(); }
}
})();
} else {
res.statusCode = 400;
res.send(
"Missing parameters. Make sure to send a valid JSON request."
);
}
});
app.post('/d3/png', function(req, res) {
const data = req.body;
if (data.scripts && data.main && data.params) {
// Render page using headless-chrome
(async () => {
var browser
try {
browser = await puppeteer.launch({headless: true, executablePath: '/usr/bin/chromium-browser'});
const page = await browser.newPage();
await page.setContent(
'<html><head></head><body><div id="viewport"></div></body></html>',
{waitUntil: 'domcontentloaded'}
);
await page.addScriptTag({path: 'd3.min.js'});
// Run the script on the viewport, save as window.chart
var scripts = '';
for (var i = 0; i < data.scripts.length; i++) {
scripts += '\n' + data.scripts[i];
}
var params = 'var params=JSON.parse(\'' + JSON.stringify(data.params) + '\');';
var main = 'window.chart = ' + data.main + '(params)(d3.select("#viewport").node());';
await page.evaluate(scripts + params + main);
// Set the viewport
const width = await page.evaluate(function(){
if (window.chart && window.chart.width) return window.chart.width();
return null;
});
const height = await page.evaluate(function(){
if (window.chart && window.chart.height) return window.chart.height();
return null;
});
await page.setViewport({
// The png seems to get cut off with the actual width
width: data.params.viewport_width + 16 || width + 16 || 1000,
// The height seems to get expanded automatically
height: data.params.viewport_height || height || 1
});
// Save the PNG
const clipRect = await page.evaluate(function() {
return document.getElementById('viewport').getBoundingClientRect();
});
const png_buffer = await page.screenshot({type: 'png', clip: {
x: clipRect.x || 0,
y: clipRect.y || 0,
width: clipRect.width || width,
height: clipRect.height || height,
}});
const png = png_buffer.toString('base64');
await browser.close();
// Return the PNG
res.header('Content-Type', 'application/base64');
res.header('Content-Length', png.length.toString());
res.send(png);
} finally {
if (browser) { await browser.close(); }
}
})();
} else {
res.statusCode = 400;
res.send(
"Missing parameters. Make sure to send a valid JSON request."
);
}
});
app.listen(1337);
console.log('Listening on port 1337.');