From 32523cdcd9eaa4ad9363d79ebe82d5de4b852676 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Wed, 22 Nov 2017 21:23:14 +0100
Subject: Add module 'zelfoverhoor'

Beta stage
---
 modules/zelfoverhoor/zelfoverhoor.js | 189 +++++++++++++++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 modules/zelfoverhoor/zelfoverhoor.js

(limited to 'modules/zelfoverhoor/zelfoverhoor.js')

diff --git a/modules/zelfoverhoor/zelfoverhoor.js b/modules/zelfoverhoor/zelfoverhoor.js
new file mode 100644
index 0000000..c55f0e0
--- /dev/null
+++ b/modules/zelfoverhoor/zelfoverhoor.js
@@ -0,0 +1,189 @@
+var cmn=require("../$common.js"),
+    fs=require("fs");
+
+var moddir;
+
+var accounts=require("./accounts.json");
+
+// {<id>: {q: "question", a: "answer"}}
+var questiondb={};
+// {<id>: {id, name, description, questions: [<question_id>]}}
+var questionsets={};
+// {<username>: [<set_id>]}
+var userlists={};
+
+function uniqidstr(validp){
+	for(var len=6;;len++){
+		var str="";
+		for(var i=0;i<len;i++)str+=String.fromCharCode(97+Math.random()*26|0);
+		if(validp(str))return str;
+	}
+}
+
+var persistDB=(function(){
+	var qdbCache=null,qsetsCache=null,ulCache=null;
+	return function persistDB(){
+		var s=JSON.stringify(questiondb);
+		if(s!=qdbCache){
+			qdbCache=s;
+			fs.writeFile(moddir+"/questiondb.json",JSON.stringify(questiondb),function(err){
+				if(err)console.log("write questiondb.json:",err);
+			});
+		}
+		s=JSON.stringify(questionsets);
+		if(s!=qsetsCache){
+			qsetsCache=s;
+			fs.writeFile(moddir+"/questionsets.json",JSON.stringify(questionsets),function(err){
+				if(err)console.log("write questionsets.json:",err);
+			});
+		}
+		s=JSON.stringify(userlists);
+		if(s!=ulCache){
+			ulCache=s;
+			fs.writeFile(moddir+"/userlists.json",JSON.stringify(userlists),function(err){
+				if(err)console.log("write userlists.json:",err);
+			});
+		}
+	};
+})();
+
+function shuffle(a){
+	var j,v,i;
+	for(var i=a.length-1;i>0;i--){
+		j=Math.floor(Math.random()*(i+1));
+		v=a[i]; a[i]=a[j]; a[j]=v;
+	}
+}
+
+module.exports=function(app,io,_moddir){
+	moddir=_moddir;
+
+	try {
+		questiondb=JSON.parse(fs.readFileSync(moddir+"/questiondb.json"));
+		questionsets=JSON.parse(fs.readFileSync(moddir+"/questionsets.json"));
+		userlists=JSON.parse(fs.readFileSync(moddir+"/userlists.json"));
+	} catch(e){
+		console.log("error on reading zelfoverhoor db");
+		questiondb={};
+		questionsets={};
+		userlists={};
+		persistDB();
+	}
+
+	app.get("/zelfoverhoor",function(req,res){
+		res.sendFile(moddir+"/index.html");
+	});
+
+	app.get("/zelfoverhoor/qs/:id",function(req,res){
+		var qset=questionsets[req.params.id];
+		if(qset==null){
+			res.status(404).sendFile(moddir+"/notfound.html");
+			return;
+		}
+		var list=[];
+		for(var i=0;i<qset.questions.length;i++){
+			list.push(questiondb[qset.questions[i]]);
+		}
+		var resset={"id": qset.id, "name": qset.name, "description": qset.description, "questions": list};
+		shuffle(resset.questions);
+		fs.readFile(moddir+"/qs.html",function(err,data){
+			if(err)throw err;
+			res.send(String(data)
+				.replace("<!--###ID###-->",req.params.id)
+				.replace("/*###QUESTIONSET###*/",JSON.stringify(resset)));
+		});
+	});
+
+	app.use(["/zelfoverhoor/docent","/zelfoverhoor/docent/*"],cmn.authgen(accounts));
+	app.get("/zelfoverhoor/docent",function(req,res){
+		fs.readFile(moddir+"/docent.html",function(err,data){
+			if(err)throw err;
+			res.send(String(data)
+				.replace(/<!--###NAME###-->/g,req.authuser));
+		});
+	});
+	app.get("/zelfoverhoor/docent/sets",function(req,res){
+		if(userlists[req.authuser]==null){
+			userlists[req.authuser]=[];
+		}
+		var ul=userlists[req.authuser];
+		var list=[];
+		for(var i=0;i<ul.length;i++){
+			list.push(questionsets[ul[i]]);
+		}
+		res.send(JSON.stringify(list));
+	});
+	app.post("/zelfoverhoor/docent/addset",function(req,res){
+		var qset;
+		try {
+			qset=JSON.parse(req.body);
+		} catch(e){
+			res.status(400).send("Invalid json received");
+			return;
+		}
+		if(!qset.name||typeof qset.name!="string"||
+				!qset.description||typeof qset.description!="string"||
+				!qset.questions||!Array.isArray(qset.questions)){
+			res.status(400).send("Invalid data received");
+			return;
+		}
+		var i;
+		for(i=0;i<qset.questions.length;i++){
+			if(!qset.questions[i].q||typeof qset.questions[i].q!="string"||
+					!qset.questions[i].a||typeof qset.questions[i].a!="string"){
+				res.status(400).send("Invalid question data received");
+				return;
+			}
+		}
+		var ids=[],id;
+		for(i=0;i<qset.questions.length;i++){
+			id=uniqidstr(function(s){return questiondb[s]==null;});
+			questiondb[id]={"q": qset.questions[i].q, "a": qset.questions[i].a};
+			ids.push(id);
+		}
+		var setid=uniqidstr(function(s){return questionsets[s]==null;});
+		questionsets[setid]={"id": setid, "name": qset.name, "description": qset.description, "questions": ids};
+		if(userlists[req.authuser]==null){
+			userlists[req.authuser]=[];
+		}
+		userlists[req.authuser].push(setid);
+		persistDB();
+		res.send(setid);
+	});
+	app.post("/zelfoverhoor/docent/deleteset",function(req,res){
+		var setid=req.body;
+		if(!setid||typeof setid!="string"){
+			res.status(400).send("Invalid id received");
+			return;
+		}
+		if(!userlists[req.authuser]){
+			userlists[req.authuser]=[];
+		}
+		var ul=userlists[req.authuser];
+		var found=false;
+		for(var i=0;i<ul.length;i++){
+			if(ul[i]==setid){
+				ul.splice(i,1);
+				found=true;
+				break;
+			}
+		}
+		if(!found){
+			res.status(404).send("ID not found");
+			return;
+		}
+		persistDB();
+		res.send();
+	});
+
+	app.get("/zelfoverhoor/docent/docent.js",function(req,res){
+		res.sendFile(moddir+"/docent.js");
+	});
+
+	app.get("/zelfoverhoor/qs.js",function(req,res){
+		res.sendFile(moddir+"/qs.js");
+	});
+	app.get("/zelfoverhoor/style.css",function(req,res){
+		res.sendFile(moddir+"/style.css");
+	});
+};
-- 
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