sockets.js

   1 const message = require("./public/javascripts/utils/socketMessages");
   2 const params = require("./config/parameters");
   3 const AssessmentEntity = require("./entities/assessment");
   4 const ObjectId = require("bson-objectid");
   5
   6 module.exports = function(io)
   7 {
   8     io.of("/").on("connection", socket => {
   9         const aid = socket.handshake.query.aid;
  10         socket.join(aid);
  11         // Student or monitor connexion
  12         const isTeacher = !!socket.handshake.query.secret && socket.handshake.query.secret == params.secret;
  13         if (isTeacher)
  14         {
  15             socket.on(message.newAnswer, m => { //got answer from student
  16                 socket.emit(message.newAnswer, m);
  17             });
  18             socket.on(message.allAnswers, m => { //send feedback to student (answers)
  19                 if (!!students[m.number]) //TODO: namespace here... room quiz
  20                     socket.broadcast.to(aid).emit(message.allAnswers, m);
  21             });
  22         }
  23         else //student
  24         {
  25             const number = socket.handshake.query.number;
  26             const password = socket.handshake.query.password;
  27             AssessmentEntity.checkPassword(ObjectId(aid), number, password, (err,ret) => {
  28                 if (!!err || !ret)
  29                     return; //wrong password, or some unexpected error...
  30                 // TODO: Prevent socket connection (just ignore) if student already connected
  31 //              io.of('/').in(aid).clients((error, clients) => {
  32 //                  if (error)
  33 //                      throw error;
  34 //                  if (clients.some( c => { return c. .. == number; }))
  35 //                      // Problem: we just have a list of socket IDs (not handshakes)
  36 //              });
  37                 // TODO: next is conditional to "student not already taking the exam"
  38                 socket.on(message.allAnswers, () => { //got all answers from teacher
  39                     socket.emit(message.allAnswers, m);
  40                 });
  41                 socket.on("disconnect", () => {
  42                     //TODO: notify monitor (grey low opacity background)
  43                     //Also send to server: discoTime in assessment.papers ...
  44                 });
  45             });
  46         }
  47     });
  48 }