| 1 | const AssessmentEntity = require("../entities/assessment"); |
| 2 | const CourseEntity = require("../entities/course"); |
| 3 | const ObjectId = require("bson-objectid"); |
| 4 | const UserEntity = require("../entities/user"); |
| 5 | const TokenGen = require("../utils/tokenGenerator"); |
| 6 | |
| 7 | const AssessmentModel = |
| 8 | { |
| 9 | getByRefs: function(initials, code, name, cb) |
| 10 | { |
| 11 | UserEntity.getByInitials(initials, (err,user) => { |
| 12 | if (!!err || !user) |
| 13 | return cb(err || {errmsg: "User not found"}); |
| 14 | CourseEntity.getByPath(user._id, code, (err2,course) => { |
| 15 | if (!!err2 || !course) |
| 16 | return cb(err2 || {errmsg: "Course not found"}); |
| 17 | AssessmentEntity.getByPath(course._id, name, (err3,assessment) => { |
| 18 | if (!!err3 || !assessment) |
| 19 | return cb(err3 || {errmsg: "Assessment not found"}); |
| 20 | cb(null,assessment); |
| 21 | }); |
| 22 | }); |
| 23 | }); |
| 24 | }, |
| 25 | |
| 26 | checkPassword: function(aid, number, password, cb) |
| 27 | { |
| 28 | AssessmentEntity.getById(aid, (err,assessment) => { |
| 29 | if (!!err || !assessment) |
| 30 | return cb(err, assessment); |
| 31 | const paperIdx = assessment.papers.findIndex( item => { return item.number == number; }); |
| 32 | if (paperIdx === -1) |
| 33 | return cb({errmsg: "Paper not found"}, false); |
| 34 | cb(null, assessment.papers[paperIdx].password == password); |
| 35 | }); |
| 36 | }, |
| 37 | |
| 38 | add: function(uid, cid, name, cb) |
| 39 | { |
| 40 | // 1) Check that course is owned by user of ID uid |
| 41 | CourseEntity.getById(cid, (err,course) => { |
| 42 | if (!!err || !course) |
| 43 | return cb({errmsg: "Course retrieval failure"}); |
| 44 | if (!course.uid.equals(uid)) |
| 45 | return cb({errmsg:"Not your course"},undefined); |
| 46 | // 2) Insert new blank assessment |
| 47 | AssessmentEntity.insert(cid, name, cb); |
| 48 | }); |
| 49 | }, |
| 50 | |
| 51 | update: function(uid, assessment, cb) |
| 52 | { |
| 53 | const aid = ObjectId(assessment._id); |
| 54 | // 1) Check that assessment is owned by user of ID uid |
| 55 | AssessmentEntity.getById(aid, (err,assessmentOld) => { |
| 56 | if (!!err || !assessmentOld) |
| 57 | return cb({errmsg: "Assessment retrieval failure"}); |
| 58 | CourseEntity.getById(ObjectId(assessmentOld.cid), (err2,course) => { |
| 59 | if (!!err2 || !course) |
| 60 | return cb({errmsg: "Course retrieval failure"}); |
| 61 | if (!course.uid.equals(uid)) |
| 62 | return cb({errmsg:"Not your course"},undefined); |
| 63 | // 2) Replace assessment |
| 64 | delete assessment["_id"]; |
| 65 | assessment.cid = ObjectId(assessment.cid); |
| 66 | AssessmentEntity.replace(aid, assessment, cb); |
| 67 | }); |
| 68 | }); |
| 69 | }, |
| 70 | |
| 71 | // Set password in responses collection |
| 72 | startSession: function(aid, number, password, cb) |
| 73 | { |
| 74 | AssessmentEntity.getPaperByNumber(aid, number, (err,paper) => { |
| 75 | if (!!err) |
| 76 | return cb(err,null); |
| 77 | if (!paper && !!password) |
| 78 | return cb({errmsg: "Cannot start a new exam before finishing current"},null); |
| 79 | if (!!paper) |
| 80 | { |
| 81 | if (!password) |
| 82 | return cb({errmsg: "Missing password"}); |
| 83 | if (paper.password != password) |
| 84 | return cb({errmsg: "Wrong password"}); |
| 85 | } |
| 86 | AssessmentEntity.getQuestions(aid, (err,questions) => { |
| 87 | if (!!err) |
| 88 | return cb(err,null); |
| 89 | if (!!paper) |
| 90 | return cb(null,{paper:paper,questions:questions}); |
| 91 | const pwd = TokenGen.generate(12); //arbitrary number, 12 seems enough... |
| 92 | AssessmentEntity.startSession(aid, number, pwd, (err2,ret) => { |
| 93 | cb(err2, { |
| 94 | questions: questions, |
| 95 | password: pwd, |
| 96 | }); |
| 97 | }); |
| 98 | }); |
| 99 | }); |
| 100 | }, |
| 101 | |
| 102 | newAnswer: function(aid, number, password, input, cb) |
| 103 | { |
| 104 | // Check that student hasn't already answered |
| 105 | AssessmentEntity.hasInput(aid, number, password, input.index, (err,ret) => { |
| 106 | if (!!err) |
| 107 | return cb(err,null); |
| 108 | if (!!ret) |
| 109 | return cb({errmsg:"Question already answered"},null); |
| 110 | AssessmentEntity.setInput(aid, number, password, input, (err2,ret2) => { |
| 111 | if (!!err2 || !ret2) |
| 112 | return cb(err2,ret2); |
| 113 | return cb(null,ret2); |
| 114 | }); |
| 115 | }); |
| 116 | }, |
| 117 | |
| 118 | // NOTE: no callbacks for 2 next functions, failures are not so important |
| 119 | // (because monitored: teachers can see what's going on) |
| 120 | |
| 121 | newConnection: function(aid, number) |
| 122 | { |
| 123 | //increment discoCount, reset discoTime to NULL, update totalDisco |
| 124 | AssessmentEntity.getDiscoTime(aid, number, (err,discoTime) => { |
| 125 | if (!!discoTime) |
| 126 | AssessmentEntity.addDisco(aid, number, Date.now() - discoTime); |
| 127 | }); |
| 128 | }, |
| 129 | |
| 130 | endSession: function(aid, number, password, cb) |
| 131 | { |
| 132 | AssessmentEntity.endAssessment(aid, number, password, (err,ret) => { |
| 133 | if (!!err || !ret) |
| 134 | return cb(err,ret); |
| 135 | AssessmentEntity.getConclusion(aid, (err2,conclusion) => { |
| 136 | cb(err2, {conclusion:conclusion}); |
| 137 | }); |
| 138 | }); |
| 139 | }, |
| 140 | }; |
| 141 | |
| 142 | module.exports = AssessmentModel; |