Add Backend code for Quiz Portal

Quiz_Portal/Backend/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

Quiz_Portal/Backend/index.js

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+require('dotenv').config();
+const express = require('express');
+const bodyParser = require('body-parser');
+const TinCan = require('tincanjs');
+
+const app = express();
+const port = process.env.PORT || 5000;
+
+app.use(bodyParser.json());
+
+app.use((req, res, next) => {
+    res.header("Access-Control-Allow-Origin", "*");
+    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
+    res.header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
+    next();
+});
+
+let lrs;
+try {
+    lrs = new TinCan.LRS({
+        endpoint: process.env.LRS_ENDPOINT,
+        username: process.env.LRS_KEY,
+        password: process.env.LRS_SECRET,
+        allowFail: false
+    });
+    console.log("LRS object setup successfully.");
+} catch (ex) {
+    console.error("Failed to setup LRS object: ", ex);
+    process.exit(1);
+}
+
+app.post('/api/quiz-result', (req, res) => {
+    const { learner, quizResult } = req.body;
+
+    const statement = new TinCan.Statement({
+        actor: {
+            mbox: `mailto:${learner.email}`,
+            name: learner.name,
+        },
+        verb: {
+            id: "http://adlnet.gov/expapi/verbs/completed",
+            display: { "en-US": "completed" }
+        },
+        object: {
+            id: "http://example.com/activities/quiz",
+            definition: {
+                name: { "en-US": "Quiz" },
+                description: { "en-US": "A quiz to test the learner's knowledge." }
+            }
+        },
+        result: {
+            score: {
+                raw: quizResult.correctPoints,
+                max: quizResult.totalPoints
+            },
+            success: quizResult.numberOfCorrectAnswers > 0,
+            completion: true
+        }
+    });
+
+    lrs.saveStatement(statement, {
+        callback: function (err, xhr) {
+            if (err !== null) {
+                console.error("Failed to save statement: ", err);
+                console.error("Error details:", xhr.responseText);
+                res.status(500).send("Failed to save statement");
+            } else {
+                console.log("Statement saved successfully");
+                res.status(200).send("Statement saved successfully");
+            }
+        }
+    });
+});
+
+app.listen(port, () => {
+    console.log(`Server is running on http://localhost:${port}`);
+});

Quiz_Portal/Backend/models/Quiz.js

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+const mongoose = require('mongoose');
+
+const QuizSchema = new mongoose.Schema({
+    question: String,
+    type: { type: String, enum: ['multiple-choice', 'fill-in-the-blank'], required: true },
+    options: [String], // Only for multiple-choice questions
+    correctAnswer: String, // Correct option or answer
+    points: { type: Number, default: 4 }
+});
+
+const Quiz = mongoose.model('Quiz', QuizSchema);