Stackedit/app/pdf.js

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4.3 KiB
JavaScript
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/* global window,MathJax */
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var spawn = require('child_process').spawn;
var fs = require('fs');
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var path = require('path');
var os = require('os');
var request = require('request');
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function waitForJavaScript() {
if(window.MathJax) {
// Amazon EC2: fix TeX font detection
MathJax.Hub.Register.StartupHook("HTML-CSS Jax Startup",function () {
var HTMLCSS = MathJax.OutputJax["HTML-CSS"];
HTMLCSS.Font.checkWebFont = function (check,font,callback) {
if (check.time(callback)) {
return;
}
if (check.total === 0) {
HTMLCSS.Font.testFont(font);
setTimeout(check,200);
} else {
callback(check.STATUS.OK);
}
};
});
MathJax.Hub.Queue(function () {
window.status = 'done';
});
}
else {
setTimeout(function() {
window.status = 'done';
}, 2000);
}
}
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var authorizedPageSizes = [
'A3',
'A4',
'Legal',
'Letter'
];
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exports.export = function(req, res, next) {
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function onError(err) {
next(err);
}
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function onUnknownError() {
res.statusCode = 400;
res.end('Unknown error');
}
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function onUnauthorizedError() {
res.statusCode = 401;
res.end('Unauthorized');
}
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function onTimeout() {
res.statusCode = 408;
res.end('Request timeout');
}
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request({
uri: 'https://monetizejs.com/api/payments',
qs: {
access_token: req.query.token
},
json: true
}, function (err, paymentsRes, payments) {
var authorized = payments && payments.app == 'ESTHdCYOi18iLhhO' && (
(payments.chargeOption && payments.chargeOption.alias == 'once') ||
(payments.subscriptionOption && payments.subscriptionOption.alias == 'yearly'));
if(err || paymentsRes.statusCode != 200 || !authorized) {
return onUnauthorizedError();
}
var options, params = [];
try {
options = JSON.parse(req.query.options);
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}
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catch(e) {
options = {};
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}
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// Margins
var marginTop = parseInt(options.marginTop);
params.push('-T', isNaN(marginTop) ? 25 : marginTop);
var marginRight = parseInt(options.marginRight);
params.push('-R', isNaN(marginRight) ? 25 : marginRight);
var marginBottom = parseInt(options.marginBottom);
params.push('-B', isNaN(marginBottom) ? 25 : marginBottom);
var marginLeft = parseInt(options.marginLeft);
params.push('-L', isNaN(marginLeft) ? 25 : marginLeft);
// Header
options.headerCenter && params.push('--header-center', options.headerCenter);
options.headerLeft && params.push('--header-left', options.headerLeft);
options.headerRight && params.push('--header-left', options.headerRight);
options.headerFontName && params.push('--header-font-name ', options.headerFontName);
options.headerFontSize && params.push('--header-font-size ', options.headerFontSize);
// Footer
options.footerCenter && params.push('--footer-center', options.footerCenter);
options.footerLeft && params.push('--footer-left', options.footerLeft);
options.footerRight && params.push('--footer-left', options.footerRight);
options.footerFontName && params.push('--footer-font-name ', options.footerFontName);
options.footerFontSize && params.push('--footer-font-size ', options.footerFontSize);
// Page size
params.push('--page-size', authorizedPageSizes.indexOf(options.pageSize) === -1 ? 'A4' : options.pageSize);
// Use a temp file as wkhtmltopdf can't access /dev/stdout on Amazon EC2 for some reason
var filePath = path.join(os.tmpDir(), Date.now() + '.pdf');
var binPath = process.env.WKHTMLTOPDF_PATH || 'wkhtmltopdf';
params.push('--run-script', waitForJavaScript.toString() + 'waitForJavaScript()');
params.push('--window-status', 'done');
var wkhtmltopdf = spawn(binPath, params.concat('-', filePath), {
stdio: [
'pipe',
'ignore',
'ignore'
]
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});
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var timeoutId = setTimeout(function() {
timeoutId = undefined;
wkhtmltopdf.kill();
}, 30000);
wkhtmltopdf.on('error', onError);
wkhtmltopdf.stdin.on('error', onError);
wkhtmltopdf.on('close', function(code) {
if(!timeoutId) {
return onTimeout();
}
clearTimeout(timeoutId);
if(code) {
return onUnknownError();
}
var readStream = fs.createReadStream(filePath);
readStream.on('open', function() {
readStream.pipe(res);
});
readStream.on('close', function() {
fs.unlink(filePath, function() {
});
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});
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readStream.on('error', onUnknownError);
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});
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req.pipe(wkhtmltopdf.stdin);
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});
};