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server.js
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var fs = require('fs');
var Routes = require('./Routes.js');
var webpage = require('webpage');
var app = new Routes();
app.post('/d3/svg', function(req, res) {
data = JSON.parse(req.post);
if (data.scripts && data.main && data.params) {
var page;
try {
page = webpage.create();
page.viewportSize = {
width: data.params.viewport_width || 1000,
height: data.params.viewport_height || 1000
};
page.setContent('<html><head><meta charset="utf-8"></head><body></body></html>', 'http://www.nohost.org');
page.injectJs('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());';
page.evaluateJavaScript('function(){' + scripts + params + main + '}');
var svg = 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 (page) page.close();
}
} else {
res.statusCode = 400;
res.send(
"Missing parameters. Make sure to send a valid JSON request."
);
}
});
app.post('/d3/pdf', function(req, res) {
data = JSON.parse(req.post);
if (data.scripts && data.main && data.params) {
// Create the page
var page;
try {
page = webpage.create();
page.setContent(
'<html><head></head><body><div id="viewport"></div></body></html>',
'http://www.nohost.org'
);
page.injectJs('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());';
page.evaluateJavaScript('function(){' + scripts + params + main + '}');
// Set the viewport
width = page.evaluate(function(){
if (window.chart && window.chart.width) return window.chart.width();
return null;
});
height = page.evaluate(function(){
if (window.chart && window.chart.height) return window.chart.height();
return null;
});
page.viewportSize = {
width: data.params.viewport_width || width || 1000,
height: data.params.viewport_height || height || 1000
};
// Save as PDF
if (!fs.exists('tmp')) {
fs.makeDirectory('tmp');
}
var filename = 'tmp/' + (new Date().getTime().toString()) + '.pdf';
page.clipRect = page.evaluate(function() {
return document.querySelector('#viewport').getBoundingClientRect();
});
page.render(filename, {format: 'pdf'});
var pdf = btoa(fs.open(filename, 'rb').read());
fs.remove(filename);
// Return the PDF
res.header('Content-Type', 'application/base64');
res.header('Content-Length', pdf.length.toString());
res.send(pdf);
} finally {
if (page) page.close();
}
} else {
res.statusCode = 400;
res.send(
"Missing parameters. Make sure to send a valid JSON request."
);
}
});
app.post('/d3/png', function(req, res) {
data = JSON.parse(req.post);
if (data.scripts && data.main && data.params) {
var page;
try {
// Create Webpage
page = webpage.create();
page.setContent(
'<html><head></head><body><div id="viewport"></div></body></html>',
'http://www.nohost.org'
);
page.injectJs('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());';
page.evaluateJavaScript('function(){' + scripts + params + main + '}');
// Set the viewport
width = page.evaluate(function(){
if (window.chart && window.chart.width) return window.chart.width();
return null;
});
height = page.evaluate(function(){
if (window.chart && window.chart.height) return window.chart.height();
return null;
});
page.viewportSize = {
// 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
page.clipRect = page.evaluate(function() {
return document.querySelector('#viewport').getBoundingClientRect();
});
var png = page.renderBase64('png');
// Return the PNG
res.header('Content-Type', 'application/base64');
res.header('Content-Length', png.length.toString());
res.send(png);
} finally {
if (page) page.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.');