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task1.js
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task1.js
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var express = require("express");
var session = require("express-session");
var bodyParser = require("body-parser");
var cookieParser = require("cookie-parser");
var ejs = require("ejs");
var {readFileUtil} = require("./model/fileUtil");
var {writeFileUtil } = require("./model/fileUtil");
var {randomChoice} = require("./taskec");
const app = express();
//referenced from https://github.com/kgary/ser421public
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cookieParser());
app.use(session({
secret: 'MAGICALEXPRESSKEY',
resave: true,
saveUninitialized: true
}));
app.use((req, res, next) => {
res.set(
"Cache-Control",
"no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0"
);
next();
});
//TASK 2
app.set("view engine", "ejs");
app.engine("html", ejs.renderFile);
//handle GET routes
app.get("/", (req, res) => {
res.redirect("/landing");
});
app.get("/landing", (req, res) => {
var uname = req.session.uname;
if(uname === undefined) {
uname = req.cookies.unameCookie;
}
displayPageUtil(
"landing",
{
uname: uname,
},
res
);
});
app.get("/layoutSetting", (req, res) => {
displayPageUtil(
"settings",
{
preference: req.cookies.setLayoutStyle,
},
res
);
});
//handle POST routes
app.post("/setLayout", (req, res) => {
res.cookie("setLayoutStyle", req.body.preference);
res.redirect(307, "/survey");
});
app.post("/survey", async (req, res) => {
try {
let btn = req.body.submit;
if (btn === undefined) {
await init(req, res);
} else {
updateQuestionNum(req,btn);
}
displaySurveyPage(req, res);
} catch (err) {
console.error(err);
res.redirect("/");
}
});
app.post("/match", async (req, res) => {
req.session.uname = req.body.uname;
res.cookie("unameCookie", req.body.uname, new Date());
var userData = await parseUserData();
displayPageUtil(
"surveymatch",
{
uname: req.session.uname,
users: surveyMatches(req.session.uname, userData.usersList),
},
res
);
});
//init session and variables
async function init(req, res) {
req.session.uname = req.body.uname;
res.cookie("unameCookie", req.body.uname, new Date());
var userJson = await readFileUtil("./db/survey.json");
if (userJson === "") {
req.session.questions = [];
} else {
var userData = JSON.parse(userJson);
req.session.questions = userData["questions"];
req.session.currQuesId = 0;
req.session.totalIa = 0;
req.session.userChoices = await userReponses(req);
}
}
//TASK 1
function displaySurveyPage(req, res) {
var pageNum = req.session.currQuesId;
var session = req.session;
if (session.questions.length === 0) {
res.send("Empty/Corrupted survey.json");
return;
}
else if(session.questions.length === session.currQuesId){
destroy(req);
displayPageUtil(
"finished",
{
iaChoices: req.session.totalIa,
},
res);
} else {
session.randCh = randomChoice(session.questions[pageNum].choices.length)
displayPageUtil(
"survey",
{
uname: req.session.uname,
page: pageNum + 1,
question: session.questions[pageNum].question,
choices: session.questions[pageNum].choices,
rand: session.randCh,
selected: getChoice(session, pageNum),
layoutStyle: req.cookies.setLayoutStyle,
},
res
);
}
}
function displayPageUtil(userJson, options, res) {
app.render(userJson, options, (err, renderedData) => {
if (err) {
console.error(err);
res.send("500: Internal Server Error");
} else {
res.send(renderedData);
}
});
}
function surveyMatches(uname, usersList) {
var users = {};
var hm = new Map();
if (usersList[uname] !== undefined) {
for (let ques in usersList[uname]) {
hm.set(ques, usersList[uname][ques]);
}
}
for (let user in usersList) {
let ctr = 0;
for (let ques in usersList[user]) {
if (
user !== uname &&
hm.has(ques) &&
hm.get(ques) === usersList[user][ques]
) {
ctr++;
}
}
if (user !== uname) users[user] = ctr;
}
return Object.entries(users)
.sort(([, a], [, b]) => b - a)
.reduce((r, [k, v]) => ({ ...r, [k]: v }), {});
}
async function userReponses(req) {
var uname = req.session.uname;
var userData = await parseUserData();
var userChoices = userData.usersList[uname];
return userChoices !== undefined ? userChoices : {};
}
async function parseUserData() {
var userJson = "./db/users.json";
var userData = await readFileUtil(userJson);
return JSON.parse(userData);
}
function updateQuestionNum(req, option) {
var quesId = req.session.questions[req.session.currQuesId].id;
req.session.userChoices[quesId] = req.body.answer;
if(option === "next"){
req.session.currQuesId++;
} else if(option === "prev"){
req.session.currQuesId--;
}
if(quesId === req.session.randCh) {
req.session.totalIa++;
}
}
function getChoice(session, index) {
var quesId = session.questions[index].id;
return session.userChoices[quesId] === undefined
? ""
: parseInt(session.userChoices[quesId]);
}
async function destroy(req) {
var uname = req.session.uname;
var userJson = "./db/users.json";
var userData = await parseUserData();
userData.usersList[uname] = req.session.userChoices;
writeFileUtil(userJson, userData);
req.session.destroy();
}
app.all("*", (req, res, next) => {
res.status(404);
res.send("404: Page Not Found");
});
app.use((err, req, res, next) => {
console.error(err);
res.status(500);
res.send("500: Internal Server Error");
});
app.listen(3000);