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