<?php
$siteKey = 'YOUR_SITE_KEY';
$secretKey = 'YOUR_SECRET_KEY';
 
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $name = filter_input(INPUT_POST, 'name', FILTER_SANITIZE_SPECIAL_CHARS);
    $line_id = filter_input(INPUT_POST, 'line_id', FILTER_SANITIZE_SPECIAL_CHARS);
    $recaptchaResponse = $_POST['g-recaptcha-response'];
 
    // reCAPTCHAの検証
    $url = 'https://www.google.com/recaptcha/api/siteverify';
    $data = [
        'secret' => $secretKey,
        'response' => $recaptchaResponse,
        'remoteip' => $_SERVER['REMOTE_ADDR']
    ];
 
    $options = [
        'http' => [
            'method' => 'POST',
            'header' => 'Content-type: application/x-www-form-urlencoded',
            'content' => http_build_query($data)
        ]
    ];
 
    $context = stream_context_create($options);
    $response = file_get_contents($url, false, $context);
    $responseData = json_decode($response);
 
    if ($responseData->success && $responseData->score > 0.5) {
        // reCAPTCHAの検証成功
        $postData = $name . ',' . $line_id . "\n";
        file_put_contents('data.txt', $postData, FILE_APPEND);
        header('Location: index.php'); // 投稿後にindex.phpへリダイレクト
        exit;
    } else {
        // reCAPTCHAの検証失敗
        echo "reCAPTCHAの検証に失敗しました。";
        // エラー処理を記述
    }
} else {
    // POSTリクエスト以外の場合
    header('Location: index.php');
    exit;
}
?>
 

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