index.js

const express = require('express');
const crypto = require('crypto');

const app = express();
const port = 3000;

app.use(express.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, OPTIONS');
    next();
});

const captchaStore = new Map();

setInterval(() => {
    const now = Date.now();
    for (const [id, data] of captchaStore.entries()) {
        if (now - data.createdAt > 10 * 60 * 1000) {
            captchaStore.delete(id);
        }
    }
}, 60 * 1000);

function generateCaptchaCode(length = 6) {
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    let code = '';
    for (let i = 0; i < length; i++) {
        const randomIndex = crypto.randomInt(0, chars.length);
        code += chars[randomIndex];
    }
    return code;
}

app.get('/api/captcha', (req, res) => {
    const captchaCode = generateCaptchaCode();
    
    const captchaId = crypto.randomBytes(16).toString('hex');

    captchaStore.set(captchaId, {
        text: captchaCode,
        createdAt: Date.now()
    });

    res.json({
        captchaId: captchaId,
        code: captchaCode 
    });
});

app.post('/api/verify-captcha', (req, res) => {
    const { captchaId, userInput } = req.body;

    if (!captchaId || !userInput) {
        return res.status(400).json({
            success: false,
            message: 'CaptchaId et userInput sont requis'
        });
    }

    const storedCaptcha = captchaStore.get(captchaId);

    if (!storedCaptcha) {
        return res.status(400).json({
            success: false,
            message: 'Captcha invalide ou expiré'
        });
    }

    const isValid = userInput.toUpperCase() === storedCaptcha.text.toUpperCase();

    captchaStore.delete(captchaId);

    res.json({
        success: isValid,
        message: isValid ? 'Captcha validé avec succès' : 'Captcha incorrect'
    });
});

app.use((err, req, res, next) => {
    console.error(err.stack);
    res.status(500).json({
        success: false,
        message: 'Erreur interne du serveur'
    });
});

app.listen(port, () => {
    console.log(`API Captcha démarrée sur le port ${port}`);
});