Add pdfrotate module

author: tomsmeding <tom.smeding@gmail.com> 2017-11-16 00:33:41 +0100
committer: tomsmeding <tom.smeding@gmail.com> 2017-11-16 00:33:47 +0100
commit: dbd9786a07e9c10cfe07db58f660fa186243b9a3 (patch)
tree: b5e231bd999cbdde1432027561bfa59efe506f63 /modules/pdfrotate
parent: 4ef74766662a8b57124cdc4b7a9fdafd686f0de2 (diff)
3 files changed, 188 insertions, 0 deletions
diff --git a/modules/pdfrotate/editor.html b/modules/pdfrotate/editor.html
new file mode 100644
index 0000000..6be03a8
--- /dev/null
+++ b/modules/pdfrotate/editor.html
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+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>PDF rotate</title>
+<script>
+var sessionid=(function(){
+	var spl=location.href.split("/");
+	return spl[spl.length-1];
+})();
+</script>
+</head>
+<body>
+Editor...
+</body>
+<script>alert(sessionid);</script>
+</html>
diff --git a/modules/pdfrotate/index.html b/modules/pdfrotate/index.html
new file mode 100644
index 0000000..ae63865
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+++ b/modules/pdfrotate/index.html
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+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>PDF rotate</title>
+<script>
+window.addEventListener("load",function(){
+	var errc=location.href.split("?err=")[1];
+	if(errc){
+		if(errc=="nopdf")alert("That doesn't seem to be a PDF document.");
+		else if(errc=="rot0")alert("Haha your document was already upright. Maybe just use that instead?");
+		else if(errc=="invrot")alert("Don't bug my form, that rotation was invalid!");
+		else if(errc=="pdfjamerr")alert("An error occurred trying to convert that document. Maybe it isn't a PDF document?");
+		else alert("Unknown error occurred ('"+errc+"')");
+	}
+});
+</script>
+<style>
+.pagediagram {
+	display: inline-block;
+	border: 1px black solid;
+	width: 40px;
+	height: 56px;
+	font-family: sans-serif;
+	font-size: 40px;
+	text-align: center;
+	margin-left: 9px;
+	margin-right: 9px;
+	line-height: 62px;
+}
+</style>
+</head>
+<body>
+<h1>PDF rotate</h1>
+<p>Select a PDF file below.</p>
+<form method="POST" action="/pdfrotate/upload" enctype="multipart/form-data">
+	<input type="file" id="file" name="file" required><br>
+	<p>Click the button that looks most like the document you have. We will turn it upright.</p>
+	<table><tbody><tr>
+		<!-- CSS and pdfjam rotation are conveniently each other's inverses. -->
+		<td style="text-align: center;">
+			<label for="rot0"><div class="pagediagram" style="transform:rotate(0deg);">A</div></label><br>
+			<input type="radio" id="rot0" name="rotgroup" value="rot0" required>
+		</td>
+		<td style="text-align: center;">
+			<label for="rot90"><div class="pagediagram" style="transform:rotate(90deg);">A</div></label><br>
+			<input type="radio" id="rot90" name="rotgroup" value="rot90" required>
+		</td>
+		<td style="text-align: center;">
+			<label for="rot180"><div class="pagediagram" style="transform:rotate(180deg);">A</div></label><br>
+			<input type="radio" id="rot180" name="rotgroup" value="rot180" required>
+		</td>
+		<td style="text-align: center;">
+			<label for="rot270"><div class="pagediagram" style="transform:rotate(270deg);">A</div></label><br>
+			<input type="radio" id="rot270" name="rotgroup" value="rot270" required>
+		</td>
+	</tr></tbody></table>
+	<p>Now click the button below to finish the process!</p>
+	<input type="submit" value="Upload, turn and download result!">
+</form>
+<br>
+<br>
+<i><small>This uses <a href="https://warwick.ac.uk/fac/sci/statistics/staff/academic-research/firth/software/pdfjam/">pdfjam</a> to perform the actual hard work. Credits to me only for the slick rotated A's above.</small></i>
+</body>
+</html>
diff --git a/modules/pdfrotate/pdfrotate.js b/modules/pdfrotate/pdfrotate.js
new file mode 100644
index 0000000..a41241d
--- /dev/null
+++ b/modules/pdfrotate/pdfrotate.js
@@ -0,0 +1,106 @@
+var cmn=require("../$common.js"),
+    fs=require("fs"),
+    child_process=require("child_process"),
+    multer=require("multer"),
+    mkdirp=require("mkdirp");
+
+var moddir;
+
+var uniqid=(function(){
+	var id=0;
+	return function uniqid(){return id++;};
+})();
+
+function clearDirectory(path){
+	var entries=fs.readdirSync(path);
+	for(var i=0;i<entries.length;i++){
+		fs.unlinkSync(path+"/"+entries[i]);
+	}
+}
+
+function cleanUpDir(path){
+	var nowtime=new Date().getTime();
+	var entries=fs.readdirSync(path);
+	for(var i=0;i<entries.length;i++){
+		var stat=fs.statSync(path+"/"+entries[i]);
+		if(stat.mtime-nowtime>30*60*1000){
+			fs.unlink(path+"/"+entries[i],function(err){});
+		}
+	}
+}
+
+// Clear files older than 30 mins every 30 mins
+setInterval(function(){
+	process.nextTick(cleanUpDir(moddir+"/uploads"));
+	process.nextTick(cleanUpDir(moddir+"/converted"));
+},30*60*1000);
+
+module.exports=function(app,io,_moddir){
+	moddir=_moddir;
+
+	mkdirp.sync(moddir+"/uploads");
+	mkdirp.sync(moddir+"/converted");
+	clearDirectory(moddir+"/uploads");
+
+	var multerupload=multer({
+		storage: multer.diskStorage({
+			destination: function(req,file,cb){
+				cb(null,moddir+"/uploads/");
+			},
+			filename: function(req,file,cb){
+				cb(null,uniqid()+".pdf");
+			}
+		}),
+		limits: {
+			files: 1,
+			fileSize: 100*1024*1024
+		}
+	});
+
+	app.get("/pdfrotate",function(req,res){
+		res.sendFile(moddir+"/index.html");
+	});
+	app.post("/pdfrotate/upload",multerupload.single("file"),function(req,res){
+		if(!req.file){
+			res.sendFile(moddir+"/index.html");
+			return;
+		}
+		var origname=req.file.originalname;
+		var path=req.file.path;
+		var rot=req.body.rotgroup+"";
+		if(rot=="rot0"){
+			fs.unlink(path,function(err){});
+			res.redirect("/pdfrotate?err=rot0");
+			return;
+		}
+
+		var cmd;
+		switch(rot){
+			case "rot90": cmd="pdf90"; break;
+			case "rot180": cmd="pdf180"; break;
+			case "rot270": cmd="pdf270"; break;
+			default:
+				fs.unlink(path,function(err){});
+				res.redirect("/pdfrotate?err=invrot");
+				return;
+		}
+
+		var outfile=moddir+"/converted/"+uniqid()+".pdf";
+
+		child_process.execFile(cmd,[path,"-o",outfile],function(err,stdout,stderr){
+			if(err){
+				console.log(err);
+				res.redirect("/pdfrotate?err=pdfjamerr");
+				return;
+			}
+			var newname=origname.replace(/\.pdf$/,"_rotated.pdf");
+			res.download(outfile,newname,function(err){
+				fs.unlink(path,function(err){});
+				fs.unlink(outfile,function(err){});
+			});
+		});
+	});
+	app.get("/pdfrotate/upload",function(req,res){
+		res.redirect("/pdfrotate");
+	});
+};
author	tomsmeding <tom.smeding@gmail.com>	2017-11-16 00:33:41 +0100
committer	tomsmeding <tom.smeding@gmail.com>	2017-11-16 00:33:47 +0100
commit	dbd9786a07e9c10cfe07db58f660fa186243b9a3 (patch)
tree	b5e231bd999cbdde1432027561bfa59efe506f63 /modules/pdfrotate
parent	4ef74766662a8b57124cdc4b7a9fdafd686f0de2 (diff)