From f03a2ad9e0b2fa36051def18d4c19c2f293cac1d Mon Sep 17 00:00:00 2001 From: Benjamin Auder Date: Sun, 28 Jan 2018 18:00:53 +0100 Subject: [PATCH] Prevent student from re-starting the same quiz, implement resuming logic (still buggish) --- entities/assessment.js | 44 +++++++++++++++++ models/assessment.js | 47 +++++++++++++++--- public/javascripts/assessment.js | 83 ++++++++++++++++++++------------ routes/assessments.js | 22 +++++---- views/assessment.pug | 11 ++--- 5 files changed, 153 insertions(+), 54 deletions(-) diff --git a/entities/assessment.js b/entities/assessment.js index 2104193..a8a781b 100644 --- a/entities/assessment.js +++ b/entities/assessment.js @@ -106,6 +106,25 @@ const AssessmentEntity = ); }, + getPaperByNumber: function(aid, number, callback) + { + db.assessments.findOne( + { + _id: aid, + "papers.number": number, + }, + (err,a) => { + if (!!err || !a) + return callback(err,a); + for (let p of a.papers) + { + if (p.number == number) + return callback(null,p); //reached for sure + } + } + ); + }, + startSession: function(aid, number, password, callback) { // TODO: security, do not re-do tasks if already done @@ -123,6 +142,31 @@ const AssessmentEntity = ); }, + + hasInput: function(aid, number, password, idx, cb) + { + db.assessments.findOne( + { + _id: aid, + "papers.number": number, + "papers.password": password, + }, + (err,a) => { + if (!!err || !a) + return cb(err,a); + for (let p of a.papers) + { + for (let i of p.inputs) + { + if (i.index == idx) + return cb(null,true); + } + } + cb(null,false); + } + ); + }, + // https://stackoverflow.com/questions/27874469/mongodb-push-in-nested-array setInput: function(aid, number, password, input, callback) //input: index + arrayOfInt (or txt) { diff --git a/models/assessment.js b/models/assessment.js index 3f89cc9..a1a41e2 100644 --- a/models/assessment.js +++ b/models/assessment.js @@ -57,19 +57,52 @@ const AssessmentModel = }, // Set password in responses collection - startSession: function(aid, number, cb) + startSession: function(aid, number, password, cb) { - const password = TokenGen.generate(12); //arbitrary number, 12 seems enough... - AssessmentEntity.getQuestions(aid, (err,questions) => { - AssessmentEntity.startSession(aid, number, password, (err2,ret) => { - cb(err, { - questions: questions, - password: password, + AssessmentEntity.getPaperByNumber(aid, number, (err,paper) => { + if (!!err) + return cb(err,null); + if (!!paper) + { + if (!password) + return cb({errmsg:"Missing password"}); + if (paper.password != password) + return cb({errmsg:"Wrong password"}); + } + AssessmentEntity.getQuestions(aid, (err,questions) => { + if (!!err) + return cb(err,null); + if (!!paper) + return cb(null,{paper:paper,questions:questions}); + AssessmentEntity.startSession(aid, number, password, (err2,ret) => { + const pwd = TokenGen.generate(12); //arbitrary number, 12 seems enough... + cb(err2, { + questions: questions, + password: pwd, + }); }); }); }); }, + newAnswer: function(aid, number, password, input, cb) + { + console.log(JSON.stringify(input)); + // Check that student hasn't already answered + AssessmentEntity.hasInput(aid, number, password, input.index, (err,ret) => { + if (!!err) + return cb(err,null); + if (!!ret) + return cb({errmsg:"Question already answered"},null); + AssessmentEntity.setInput(aid, number, password, input, (err2,ret2) => { + console.log(JSON.stringify(ret2)); + if (!!err2 || !ret2) + return cb(err2,ret2); + return cb(null,ret2); + }); + }); + }, + endSession: function(aid, number, password, cb) { AssessmentEntity.endAssessment(aid, number, password, (err,ret) => { diff --git a/public/javascripts/assessment.js b/public/javascripts/assessment.js index c574f1f..5fe24cd 100644 --- a/public/javascripts/assessment.js +++ b/public/javascripts/assessment.js @@ -11,7 +11,8 @@ function checkWindowSize() // NOTE: temporarily accept smartphone (security hole: pretend being a smartphone on desktop browser...) if (navigator.userAgent.match(/(iPhone|iPod|iPad|Android|BlackBerry)/)) return true; - return window.innerWidth == screen.width && window.innerHeight == screen.height; + // 3 is arbitrary, but a small tolerance is required (e.g. in Firefox) + return window.innerWidth >= screen.width-3 && window.innerHeight >= screen.height-3; }; new Vue({ @@ -27,15 +28,11 @@ new Vue({ // 4: show answers stage: assessment.mode != "open" ? 0 : 1, remainingTime: 0, //global, in seconds + warnMsg: "", }, components: { "statements": { props: ['assessment','inputs','student','stage'], - data: function() { - return { - index: 0, //current question index in assessment.indices - }; - }, // TODO: general render function for nested exercises // TODO: with answer if stage==4 : class "wrong" if ticked AND stage==4 AND received answers // class "right" if stage == 4 AND received answers (background-color: red / green) @@ -43,7 +40,7 @@ new Vue({ // Full questions tree is rendered, but some parts hidden depending on display settings render(h) { let self = this; - let questions = assessment.questions.map( (q,i) => { + let questions = (assessment.questions || [ ]).map( (q,i) => { let questionContent = [ ]; questionContent.push( h( @@ -69,7 +66,7 @@ new Vue({ "input", { domProps: { - checked: this.inputs[i][idx], + checked: this.inputs.length > 0 && this.inputs[i][idx], }, attrs: { id: this.inputId(i,idx), @@ -124,7 +121,7 @@ new Vue({ { "class": { "question": true, - "hide": this.stage == 2 && assessment.display == 'one' && assessment.indices[this.index] != i, + "hide": this.stage == 2 && assessment.display == 'one' && assessment.indices[assessment.index] != i, }, }, questionContent @@ -132,7 +129,6 @@ new Vue({ }); if (this.stage == 2) { - // TODO: one button per question questions.unshift( h( "button", @@ -148,7 +144,7 @@ new Vue({ "margin-right": "auto", }, on: { - click: () => this.sendAnswer(assessment.indices[this.index]), + click: () => this.sendAnswer(assessment.indices[assessment.index]), }, }, "Send" @@ -193,14 +189,16 @@ new Vue({ }, trySendCurrentAnswer: function() { if (this.stage == 2) - this.sendAnswer(assessment.indices[this.index]); + this.sendAnswer(assessment.indices[assessment.index]); }, // stage 2 sendAnswer: function(realIndex) { - if (this.index == assessment.questions.length - 1) + console.log(realIndex); + if (assessment.index == assessment.questions.length - 1) this.$emit("gameover"); else - this.index++; + assessment.index++; + this.$forceUpdate(); //TODO: shouldn't be required if (assessment.mode == "open") return; //only local let answerData = { @@ -221,7 +219,7 @@ new Vue({ dataType: "json", success: ret => { if (!!ret.errmsg) - return alert(ret.errmsg); + return this.$emit("warning", ret.errmsg); //socket.emit(message.newAnswer, answer); }, }); @@ -236,7 +234,15 @@ new Vue({ return this.padWithZero(minutes) + ":" + this.padWithZero(seconds); }, }, + mounted: function() { + $(".modal").modal(); + }, methods: { + // In case of AJAX errors + warning: function(message) { + this.warnMsg = message; + $("#warning").modal("open"); + }, padWithZero: function(x) { if (x < 10) return "0" + x; @@ -253,7 +259,7 @@ new Vue({ dataType: "json", success: s => { if (!!s.errmsg) - return alert(s.errmsg); + return this.warning(s.errmsg); this.stage = 1; this.student = s.student; Vue.nextTick( () => { Materialize.updateTextFields(); }); @@ -268,11 +274,11 @@ new Vue({ }, // stage 1 --> 2 (get all questions, set password) startAssessment: function() { - let initializeStage2 = questions => { + let initializeStage2 = (questions,paper) => { $("#leftButton, #rightButton").hide(); if (assessment.time > 0) { - this.remainingTime = assessment.time * 60; + this.remainingTime = assessment.time * 60 - (!!paper ? paper.startTime/1000 : 0); this.runTimer(); } // Initialize structured answer(s) based on questions type and nesting (TODO: more general) @@ -280,9 +286,20 @@ new Vue({ assessment.questions = questions; for (let q of assessment.questions) this.inputs.push( _(q.options.length).times( _.constant(false) ) ); - assessment.indices = assessment.fixed - ? _.range(assessment.questions.length) - : _.shuffle( _.range(assessment.questions.length) ); + if (!paper) + { + assessment.indices = assessment.fixed + ? _.range(assessment.questions.length) + : _.shuffle( _.range(assessment.questions.length) ); + } + else + { + // Resuming + let indices = paper.inputs.map( input => { return input.index; }); + let remainingIndices = _.difference(_.range(assessment.questions.length), indices); + assessment.indices = indices.concat( _.shuffle(remainingIndices) ); + } + assessment.index = !!paper ? paper.inputs.length : 0; this.stage = 2; Vue.nextTick( () => { // Run Prism + MathJax on questions text @@ -294,8 +311,6 @@ new Vue({ }; if (assessment.mode == "open") return initializeStage2(); - // TODO: if existing password cookie: get stored answers (papers[number cookie]), inject (inputs), set index+indices - // (instead of following ajax call) $.ajax("/start/assessment", { method: "GET", data: { @@ -305,18 +320,26 @@ new Vue({ dataType: "json", success: s => { if (!!s.errmsg) - return alert(s.errmsg); - this.student.password = s.password; - // Got password: students answers locked to this page until potential teacher - // action (power failure, computer down, ...) - // TODO: set password cookie + return this.warning(s.errmsg); + if (!!s.paper) + { + // Resuming: receive stored answers + startTime + this.student.password = s.paper.password; + this.inputs = s.paper.inputs.map( inp => { return inp.input; }); + } + else + { + this.student.password = s.password; + // Got password: students answers locked to this page until potential teacher + // action (power failure, computer down, ...) + } // TODO: password also exchanged by sockets to check identity //socket = io.connect("/" + assessment.name, { // query: "number=" + this.student.number + "&password=" + this.password //}); //socket.on(message.allAnswers, this.setAnswers); //socket.on("disconnect", () => { }); //TODO: notify monitor (highlight red), redirect - initializeStage2(s.questions); + initializeStage2(s.questions, s.paper); }, }); }, @@ -352,7 +375,7 @@ new Vue({ dataType: "json", success: ret => { if (!!ret.errmsg) - return alert(ret.errmsg); + return this.warning(ret.errmsg); assessment.conclusion = ret.conclusion; this.stage = 3; delete this.student["password"]; //unable to send new answers now diff --git a/routes/assessments.js b/routes/assessments.js index 559f08f..49410c4 100644 --- a/routes/assessments.js +++ b/routes/assessments.js @@ -47,17 +47,21 @@ router.post("/update/assessment", access.ajax, access.logged, (req,res) => { router.get("/start/assessment", access.ajax, (req,res) => { let number = req.query["number"]; let aid = req.query["aid"]; - let error = validator({ _id:aid, papers:[{number:number}] }, "Assessment"); + let password = req.cookies["password"]; //potentially from cookies, resuming + let error = validator({ _id:aid, papers:[{number:number,password:password || "samplePwd"}] }, "Assessment"); if (error.length > 0) return res.json({errmsg:error}); - AssessmentModel.startSession(ObjectId(aid), number, (err,ret) => { + AssessmentModel.startSession(ObjectId(aid), number, password, (err,ret) => { access.checkRequest(res,err,ret,"Failed session initialization", () => { - // Set password - res.cookie("password", ret.password, { - httpOnly: true, - maxAge: params.cookieExpire, - }); - res.json(ret); //contains questions+password + if (!password) + { + // Set password + res.cookie("password", ret.password, { + httpOnly: true, + maxAge: params.cookieExpire, + }); + } + res.json(ret); //contains questions+password(or paper if resuming) }); }); }); @@ -70,7 +74,7 @@ router.get("/send/answer", access.ajax, (req,res) => { let error = validator({ _id:aid, papers:[{number:number,password:password,inputs:[input]}] }, "Assessment"); if (error.length > 0) return res.json({errmsg:error}); - AssessmentEntity.setInput(ObjectId(aid), number, password, input, (err,ret) => { + AssessmentModel.newAnswer(ObjectId(aid), number, password, input, (err,ret) => { access.checkRequest(res,err,ret,"Cannot send answer", () => { res.json({}); }); diff --git a/views/assessment.pug b/views/assessment.pug index b4ba8c8..c5395d6 100644 --- a/views/assessment.pug +++ b/views/assessment.pug @@ -13,15 +13,10 @@ block content .container#assessment .row #warning.modal - .modal-content - p Your answer to the current question was sent to the server. - p To avoid future unpleasant surprises, please don't - ul - li resize the window, or - li lose window focus. + .modal-content {{ warnMsg }} .modal-footer .center-align - a.modal-action.modal-close.waves-effect.waves-light.btn-flat(href="#!") Got it! + a.modal-action.modal-close.waves-effect.waves-light.btn-flat(href="#!") Ok .row .col.s12.m10.offset-m1.l8.offset-l2.xl6.offset-xl3 h4= assessment.name @@ -52,7 +47,7 @@ block content .card .timer.center(v-if="stage==2") {{ countdown }} .card - statements(:assessment="assessment" :student="student" :stage="stage" :inputs="inputs" @gameover="endAssessment") + statements(:assessment="assessment" :student="student" :stage="stage" :inputs="inputs" @gameover="endAssessment" @warning="warning") #stage3(v-show="stage==3") .card .finish Exam completed ☺ ...don't close the window! -- 2.44.0