webseite/assets/php/contact_form.php

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PHP
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<?php
session_start();
function sanitize_text(string $name, string $type) {
$filters = array(
'text' => FILTER_SANITIZE_SPECIAL_CHARS,
'email' => FILTER_SANITIZE_EMAIL,
);
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$text = filter_var(trim($_POST[$name]), $filters[$type]);
$text = stripslashes($text);
return $text;
}
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function prepare_message_body(string $message, string $name) {
// Replace HTML-Entities with actual carriage returns and line feeds
$message = str_replace("&#13;", "\r", $message);
$message = str_replace("&#10;", "\n", $message);
// Ensure line breaks via carriage return + line feed
$message = str_replace("\r\n", "\n", $message);
$message = str_replace("\n", "\r\n", $message);
$message = "Nachricht von: $name\r\n\r\n" . $message;
$message = base64_encode($message);
return $message;
}
/**
* Sending email
*
* mail(): Braucht auf dem Server einen korrekt konfigurierten Mailserver
* phpmailer: Bibliothek, der per Composer installiert wird. Tut ganz gut mit SMTP.
*/
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function send_message_to_office(string $subject, string $message, string $name, string $email) {
$returnPath = filter_var(getenv('WTF_RETURN_PATH'), FILTER_VALIDATE_EMAIL);
$to = filter_var(getenv('WTF_CONTACT_TO'), FILTER_VALIDATE_EMAIL);
if (!$returnPath || !$to) {
error_log('Address for "To" or "Return-Path" is invalid');
return false;
}
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return mail(
$to,
"=?UTF-8?B?" . base64_encode($subject) . "?=",
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prepare_message_body($message, $name),
array(
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"From" => getenv('WTF_CONTACT_FROM'),
"Reply-To" => $email,
"Content-Type" => "text/plain; charset=utf-8",
"Content-Transfer-Encoding" => "base64",
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),
"-f $returnPath"
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);
}
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function send_response(array $response_data) {
$json = json_encode($response_data);
if ($json === false) {
// Avoid echo of empty string (which is invalid JSON), and
// JSONify the error message instead:
$json = json_encode(["jsonError" => json_last_error_msg()]);
if ($json === false) {
// This should not happen, but …
$json = '{"jsonError":"unknown"}';
}
// Set HTTP response status code to: 500 - Internal Server Error
http_response_code(500);
}
header('Content-type: application/json');
echo $json;
}
function prepare_response() {
$response = array();
if (empty($_POST['message'])) {
$response['errors'][] = 'Sieh haben keine Nachricht eingegeben.';
}
if (empty($_POST['email'])) {
$response['errors'][] = 'Sie haben keine E-Mail-Adresse eingegeben.';
}
if (empty($_POST['name'])) {
$response['errors'][] = 'Sie haben keinen Namen eingegeben.';
}
if (empty($_POST['subject'])) {
$response['errors'][] = 'Sie haben keinen Betreff eingegeben.';
}
/**
* Idee zur Bot-Erkennung:
* 1. Ein Bot hat das Pseudocaptcha entweder leer abgeschickt, oder sich selbst etwas ausgedacht.
* 2. Ein Bot schickt die Daten in unter 5s ab.
* 3. Ein Mensch braucht nicht länger als 60min.
*/
if (
$_POST['captcha'] != 'Nudelsuppe' or
time() - $_SESSION['start_time'] < 5 or
time() - $_SESSION['start_time'] > 3600
) {
$response['errors'][] = 'Wir glauben Sie sind ein Bot.';
}
if (!array_key_exists('errors', $response)) {
$subject = sanitize_text('subject', 'text');
$message = sanitize_text('message', 'text');
$name = sanitize_text('name', 'text');
$email = sanitize_text('email', 'email');
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if (!send_message_to_office($subject, $message, $name, $email)) {
$response['errors'][] = 'Ihre Nachricht konnte nicht übermittelt werden.';
} else {
$response['status'] = 'ok';
}
}
return $response;
}
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$response = array();
if (empty($_POST['action'])){
$response['errors'][] = 'Kann eigentlich nicht passieren :/';
} else {
if ($_POST['action'] == 'start_session') {
$_SESSION['start_time'] = time();
// $response['session_start_time'] = $_SESSION['start_time'];
// $response['session_id_before'] = session_id();
} elseif ($_POST['action'] == 'handle_form') {
$response = prepare_response();
session_destroy();
} else {
$response['errors'][] = 'Kann eigentlich auch nicht passieren :/';
}
}
send_response($response);
} else {
http_response_code(404);
}