Added PDF service

app/.jshintrc

@@ -0,0 +1,9 @@
+{
+    "curly": true,
+    "node": true,
+    "indent": 4,
+    "latedef": true,
+    "undef": true,
+    "unused": true,
+    "expr": true
+}

app/index.js

@@ -0,0 +1,38 @@
+var express = require('express');
+var app = express();
+
+// Configure ejs engine
+app.set('views', __dirname + '/../public');
+app.engine('html', require('ejs').renderFile);
+
+// Force HTTPS on stackedit.io
+app.all('*', function(req, res, next) {
+	if (req.headers.host == 'stackedit.io' && req.headers['x-forwarded-proto'] != 'https') {
+		res.redirect('https://stackedit.io' + req.url);
+	}
+	else {
+		/\.(eot|ttf|woff)$/.test(req.url) && res.header('Access-Control-Allow-Origin', '*');
+		next();
+	}
+});
+
+// Use gzip compression
+app.use(express.compress());
+
+// Serve static resources
+app.use(express.static(__dirname + '/../public'));
+
+// Serve viewer.html in /viewer
+app.get('/viewer', function (req, res) {
+	res.render('viewer.html');
+});
+
+app.post('/pdf', require('./pdf'));
+
+// Error 404
+app.use(function(req, res, next) {
+	res.status(404);
+	res.render('error_404.html');
+});
+
+module.exports = app;

app/pdf.js

@@ -0,0 +1,75 @@
+var spawn = require('child_process').spawn;
+var fs = require('fs');
+
+var authorizedPageSizes = [
+	'A3',
+	'A4',
+	'Legal',
+	'Letter'
+];
+
+module.exports = function(req, res, next) {
+	var options, params = [];
+	try {
+		options = JSON.parse(req.query.options);
+	}
+	catch(e) {
+		options = {};
+	}
+
+	// Margins
+	var marginRight = parseInt(options.marginRight);
+	params.push('-R', isNaN(marginRight) ? 25 : marginRight);
+	var marginTop = parseInt(options.marginTop);
+	params.push('-T', isNaN(marginTop) ? 25 : marginTop);
+	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
+	var pageSize = options.pageSize;
+	params.push('--page-size', authorizedPageSizes.indexOf(pageSize) === -1 ? 'A4' : pageSize);
+
+	// wkhtmltopdf can't access /dev/stdout on Amazon EC2 for some reason
+	var filePath = '/tmp/' + Date.now() + '.pdf';
+	var wkhtmltopdf = spawn('wkhtmltopdf', params.concat('--javascript-delay', '6000', '-', filePath), {
+		stdio: [
+			'pipe',
+			'ignore',
+			'ignore'
+		]
+	});
+	function onError(err) {
+		next(err);
+	}
+	wkhtmltopdf.on('error', onError);
+	wkhtmltopdf.stdin.on('error', onError);
+	wkhtmltopdf.on('close', function(code) {
+		if(code) {
+			res.statusCode = 400;
+			return res.end('Unknown error');
+		}
+		var readStream = fs.createReadStream(filePath);
+		readStream.on('close', function() {
+			fs.unlink(filePath, function() {
+			});
+		});
+		readStream.pipe(res);
+	});
+	req.pipe(wkhtmltopdf.stdin);
+};

public/res/constants.js

@@ -26,7 +26,7 @@ define([], function() {
 	constants.DOWNLOAD_PROXY_URL = "https://stackedit-download-proxy.herokuapp.com/";
 	constants.PICASA_PROXY_URL = "https://stackedit-picasa-proxy.herokuapp.com/";
 	constants.SSH_PROXY_URL = "https://stackedit-ssh-proxy.herokuapp.com/";
-	constants.HTMLTOPDF_URL = "https://stackedit-htmltopdf.herokuapp.com/";
+	constants.HTMLTOPDF_URL = "/pdf";
 
 	// Site dependent
 	constants.BASE_URL = "http://localhost/";

public/res/publisher.js

@@ -348,7 +348,6 @@ define([
                 var xhr = new XMLHttpRequest();
                 xhr.open('POST', constants.HTMLTOPDF_URL, true);
                 xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
-                xhr.setRequestHeader('page-size', settings.pdfPageSize);
                 xhr.responseType = 'blob';
                 xhr.onreadystatechange = function() {
                     if(this.readyState == 4) {

public/res/styles/base.less

@@ -218,6 +218,10 @@ hr {
 	margin: 2em 0;
 }
 
+img {
+	max-width: 100%;
+}
+
 .sequence-diagram, .flow-chart {
     text-align: center;
 	margin-bottom: @p-margin;
@@ -468,14 +472,3 @@ body.rtl {
         direction: rtl;
     }
 }
-
-/*******************
- * PDF
- *******************/
-body.pdf {
-	font-family: "DejaVu Sans";
-
-	code, pre {
-	    font-family: "DejaVu Sans Mono";
-	}
-}

public/res/styles/main.less

@@ -1558,9 +1558,10 @@ div.jGrowl {
 		-ms-filter: none;
 		filter: none;
 		border-radius: 4px;
+		font-family: @font-family-base;
 	}
 	div.jGrowl-notification {
-		min-height: 60px;
+		min-height: 65px;
 	}
 }
 

server.js

@@ -1,37 +1,4 @@
-var express = require('express');
+var app = require('./app');
-var app = express();
-
-// Configure ejs engine
-app.set('views', __dirname + '/public');
-app.engine('html', require('ejs').renderFile);
-
-// Force HTTPS on stackedit.io
-app.all('*', function(req, res, next) {
-    if (req.headers.host == 'stackedit.io' && req.headers['x-forwarded-proto'] != 'https') {
-        res.redirect('https://stackedit.io' + req.url);
-    }
-    else {
-		/\.(eot|ttf|woff)$/.test(req.url) && res.header('Access-Control-Allow-Origin', '*');
-        next();
-    }
-});
-
-// Use gzip compression
-app.use(express.compress());
-
-// Serve static resources
-app.use(express.static(__dirname + '/public'));
-
-// Serve viewer.html in /viewer
-app.get('/viewer', function (req, res) {
-    res.render('viewer.html');
-});
-
-// Error 404
-app.use(function(req, res, next) {
-    res.status(404);
-    res.render('error_404.html');
-});
 
 // Listen on port 3000
 var port = process.env.PORT || 3000;