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guarded to /htdocs

/old/phone/bootstrap.php

<?php
declare(strict_types=1);

require_once dirname(__DIR__) . '/_core/common.php';

function si_phone_load_config(): void
{
    si_core_load();
    if (!defined('TWILIO_ACCOUNT_SID') || !defined('TWILIO_PHONE_NUMBER')) throw new RuntimeException('Twilio configuration was not found.');
}

function si_phone_xml(string $xml, int $status = 200): never
{
    http_response_code($status);
    header('Content-Type: text/xml; charset=UTF-8');
    header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
    echo $xml;
    exit;
}

function si_phone_escape(string $value): string
{
    return htmlspecialchars($value, ENT_XML1 | ENT_QUOTES, 'UTF-8');
}

function si_phone_base_url(): string
{
    return defined('SI_PHONE_WEBHOOK_BASE_URL')
        ? rtrim((string) SI_PHONE_WEBHOOK_BASE_URL, '/')
        : 'https://www.gaylordsinclair.com/si/phone';
}

function si_phone_request_url(): string
{
    if (defined('SI_TWILIO_REQUEST_URL') && (string) SI_TWILIO_REQUEST_URL !== '') {
        return (string) SI_TWILIO_REQUEST_URL;
    }

$host = (string) ($_SERVER['HTTP_HOST'] ?? 'www.gaylordsinclair.com');
    $uri = (string) ($_SERVER['REQUEST_URI'] ?? '/');
    return 'https://' . $host . $uri;
}

function si_phone_validate_twilio_request(): void
{
    if (PHP_SAPI === 'cli' || $_SERVER['REQUEST_METHOD'] !== 'POST') {
        return;
    }

$token = defined('TWILIO_AUTH_TOKEN') ? (string) TWILIO_AUTH_TOKEN : '';
    $signature = (string) ($_SERVER['HTTP_X_TWILIO_SIGNATURE'] ?? '');
    if ($token === '' || $signature === '') {
        throw new RuntimeException('Twilio request authentication is unavailable.');
    }

$parameters = $_POST;
    ksort($parameters, SORT_STRING);
    $payload = si_phone_request_url();
    foreach ($parameters as $key => $value) {
        if (is_scalar($value)) {
            $payload .= (string) $key . (string) $value;
        }
    }

$expected = base64_encode(hash_hmac('sha1', $payload, $token, true));
    if (!hash_equals($expected, $signature)) {
        throw new RuntimeException('Invalid Twilio request signature.');
    }
}

function si_phone_post(string $key, string $default = ''): string
{
    $value = $_POST[$key] ?? $default;
    return is_scalar($value) ? trim((string) $value) : $default;
}

function si_phone_log(string $event, array $details = []): void
{
    si_core_log('si_phone', $event, $details);
}

try {
    si_phone_load_config();
    si_phone_validate_twilio_request();
} catch (Throwable $exception) {
    si_phone_xml(
        '<?xml version="1.0" encoding="UTF-8"?>' .
        '<Response><Say>SI telephone configuration is temporarily unavailable.</Say></Response>',
        500
    );
}

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