243 lines
7.6 KiB
PHP
243 lines
7.6 KiB
PHP
<?php
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// chatbot.php — Version sécurisée production + anti prompt injection
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session_start();
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/* =======================
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CONFIG & ENV
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======================= */
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$env = parse_ini_file(__DIR__ . '/.env');
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define('API_KEY', $env['DEESEEK_API_KEY']);
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define('SYSTEM_PROMPT', $env['DEEPSEEK_SYSTEM_PROMPT']);
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define('CSRF_SECRET', $env['CSRF_SECRET']);
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/* =======================
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HEADERS SÉCURITÉ
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======================= */
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header('X-Content-Type-Options: nosniff');
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header('X-Frame-Options: SAMEORIGIN');
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header('X-XSS-Protection: 1; mode=block');
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/* =======================
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SESSION INIT
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======================= */
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if (!isset($_SESSION['csrf'])) {
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$_SESSION['csrf'] = hash_hmac('sha256', session_id(), CSRF_SECRET);
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}
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if (!isset($_SESSION['message_count'])) {
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$_SESSION['message_count'] = 0;
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}
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/* =======================
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HELPERS
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======================= */
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function isAjax(): bool {
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return isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&
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strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest';
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}
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function sanitizeMessage(string $msg) {
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$msg = trim($msg);
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if ($msg === '' || mb_strlen($msg) > 500) {
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return false;
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}
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return $msg;
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}
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/* =======================
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ANTI PROMPT INJECTION
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======================= */
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function isPromptInjection(string $msg): bool {
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// regex solide : détecte toutes les tentatives d'instructions systèmes, "ignore", "révèle", "prompt", etc.
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$pattern = '/\b(ignore|oublie|révèle|prompt|instructions?|system|agis comme|tu es maintenant|roleplay|administrateur)\b/i';
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return preg_match($pattern, $msg) === 1;
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}
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/* =======================
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API CALL
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======================= */
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function callDeepSeekAPI(string $userMessage): string {
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$payload = [
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'model' => 'deepseek-chat',
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'messages' => [
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['role' => 'system', 'content' => SYSTEM_PROMPT],
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['role' => 'user', 'content' => $userMessage]
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],
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'max_tokens' => 800,
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'temperature' => 0,
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'top_p' => 1
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];
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$ch = curl_init('https://api.deepseek.com/v1/chat/completions');
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curl_setopt_array($ch, [
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CURLOPT_RETURNTRANSFER => true,
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CURLOPT_POST => true,
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CURLOPT_POSTFIELDS => json_encode($payload),
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CURLOPT_HTTPHEADER => [
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'Content-Type: application/json',
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'Authorization: Bearer ' . API_KEY
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],
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CURLOPT_TIMEOUT => 15
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]);
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$response = curl_exec($ch);
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$http = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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curl_close($ch);
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if ($http !== 200 || !$response) {
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return 'Erreur du service.';
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}
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$json = json_decode($response, true);
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return $json['choices'][0]['message']['content'] ?? 'Erreur de réponse.';
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}
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/* =======================
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AJAX HANDLER
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======================= */
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if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['message'])) {
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if (!isAjax()) {
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http_response_code(403);
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echo json_encode(['error' => 'Requête interdite']);
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exit;
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}
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if (!isset($_POST['csrf']) || $_POST['csrf'] !== $_SESSION['csrf']) {
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http_response_code(403);
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echo json_encode(['error' => 'CSRF invalide']);
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exit;
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}
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if ($_SESSION['message_count'] >= 1) {
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echo json_encode(['error' => 'LIMIT_REACHED']);
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exit;
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}
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$message = sanitizeMessage($_POST['message']);
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if ($message === false) {
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echo json_encode(['error' => 'Message invalide']);
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exit;
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}
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// anti prompt injection
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if (isPromptInjection($message)) {
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echo json_encode(['response' => 'Demande à Bouchra.']);
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exit;
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}
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$_SESSION['message_count']++;
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$reply = callDeepSeekAPI($message);
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echo json_encode([
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'response' => $reply
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]);
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exit;
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}
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?>
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<!DOCTYPE html>
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<html lang="fr">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Assistant IA</title>
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<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap" rel="stylesheet">
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<style>
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body { margin:0; font-family:Inter,sans-serif; background:linear-gradient(135deg,#667eea,#764ba2); height:100vh; display:flex; justify-content:center; align-items:center; }
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.chat-wrapper { width:100%; max-width:900px; height:700px; background:#fff; border-radius:24px; display:flex; flex-direction:column; overflow:hidden; }
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.chat-header { padding:20px; background:linear-gradient(135deg,#667eea,#764ba2); color:#fff; font-weight:600; }
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#chat { flex:1; padding:20px; background:#f8fafc; overflow-y:auto; }
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.message { display:flex; margin-bottom:16px; }
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.message.user { justify-content:flex-end; }
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.message-bubble { max-width:70%; padding:12px 16px; border-radius:14px; font-size:14px; }
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.user .message-bubble { background:#667eea; color:#fff; }
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.bot .message-bubble { background:#fff; color:#1e293b; }
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.input-area { padding:20px; border-top:1px solid #e5e7eb; }
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#limitPopup { display:none; margin-bottom:10px; padding:10px; background:#fff3cd; color:#92400e; border-radius:10px; font-size:13px; text-align:center; }
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form { display:flex; gap:10px; }
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input { flex:1; padding:12px; border-radius:10px; border:1px solid #ccc; }
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button { padding:12px 20px; border:none; border-radius:10px; background:#667eea; color:#fff; font-weight:600; cursor:pointer; }
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button:disabled { opacity:.6; cursor:not-allowed; }
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</style>
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</head>
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<body>
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<div class="chat-wrapper">
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<div class="chat-header">Assistant IA</div>
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<div id="chat">
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<div class="message bot">
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<div class="message-bubble">
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Bonjour, comment puis‑je vous aider ?
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</div>
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</div>
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</div>
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<div class="input-area">
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<div id="limitPopup">
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Pour plus, prends l'abonnement en demandant à Bouchra
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</div>
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<form onsubmit="sendMsg();return false;">
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<input type="hidden" id="csrf" value="<?= htmlspecialchars($_SESSION['csrf']) ?>">
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<input id="userInput" type="text" placeholder="Votre message…" required>
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<button id="sendBtn">Envoyer</button>
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</form>
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</div>
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</div>
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<script>
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const chat = document.getElementById('chat');
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const input = document.getElementById('userInput');
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const btn = document.getElementById('sendBtn');
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const csrf = document.getElementById('csrf').value;
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const popup = document.getElementById('limitPopup');
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function addMsg(text, isUser) {
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const msg = document.createElement('div');
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msg.className = 'message ' + (isUser ? 'user' : 'bot');
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const bubble = document.createElement('div');
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bubble.className = 'message-bubble';
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bubble.textContent = text; // 🔒 XSS SAFE
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msg.appendChild(bubble);
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chat.appendChild(msg);
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chat.scrollTop = chat.scrollHeight;
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}
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async function sendMsg() {
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const txt = input.value.trim();
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if (!txt) return;
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addMsg(txt, true);
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input.value = '';
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btn.disabled = true;
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const res = await fetch('', {
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method:'POST',
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headers:{
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'Content-Type':'application/x-www-form-urlencoded',
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'X-Requested-With':'XMLHttpRequest'
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},
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body:'message='+encodeURIComponent(txt)+'&csrf='+encodeURIComponent(csrf)
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});
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const data = await res.json();
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if (data.error === 'LIMIT_REACHED') {
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popup.style.display = 'block';
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input.disabled = true;
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btn.disabled = true;
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addMsg('Accès limité.', false);
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return;
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}
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addMsg(data.response || 'Erreur.', false);
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btn.disabled = false;
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}
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</script>
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</body>
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</html>
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