From b92e4c28c65aab7d2148dd1317538a0fac50264e Mon Sep 17 00:00:00 2001
From: muli <muli@mrmuli.de>
Date: Wed, 3 Aug 2022 18:04:03 +0200
Subject: [PATCH] feat: Switched time based bot protection from JS to PHP
 sessions.

---
 assets/js/contact_form.js   | 20 +++++++++++++++++---
 assets/php/contact_form.php | 31 ++++++++++++++++++++++++-------
 2 files changed, 41 insertions(+), 10 deletions(-)

diff --git a/assets/js/contact_form.js b/assets/js/contact_form.js
index c4182dd..87e90e6 100644
--- a/assets/js/contact_form.js
+++ b/assets/js/contact_form.js
@@ -8,13 +8,27 @@ const captcha = document.getElementsByClassName('contact_form__captcha')[0];
 const now = (new Date().getTime()/1000).toFixed();
 const feedback = document.getElementsByClassName('contact_form__feedback')[0];
 
+window.addEventListener('DOMContentLoaded', function(event) {
+    let formData = new FormData();
+    formData.append('action', 'start_session');
+    fetch(ajaxUrl, {
+        method: 'POST',
+        mode: 'same-origin',
+        body: formData,
+    })
+    .then(response => response.json())
+    .then(json => {
+        console.log(json);
+    })
+});
+
 contact_form.addEventListener('submit', function(event) {
     event.preventDefault();
     let formData = new FormData();
+    formData.append('action', 'handle_form');
     formData.append('message', message.value);
     formData.append('name', name.value);
     formData.append('email', email.value);
-    formData.append('time_sent', now);
 
     // If some bot entered some value, return.
     if (typeof captcha.value == 'undefined') {
@@ -26,12 +40,12 @@ contact_form.addEventListener('submit', function(event) {
 
     fetch(ajaxUrl, {
         method: 'POST',
-        mode:'same-origin',
+        mode: 'same-origin',
         body: formData,
     })
     .then(response => response.json())
     .then(json => {
-        console.log(json)
+        console.log(json);
         if (json.errors) {
             feedback.classList.add('--error');
             // Über errors iterieren und diese ausgeben (evtl. nur ersten Fehler ausgeben?)
diff --git a/assets/php/contact_form.php b/assets/php/contact_form.php
index ebc5b10..205c11b 100644
--- a/assets/php/contact_form.php
+++ b/assets/php/contact_form.php
@@ -1,7 +1,5 @@
 <?php
-$message = '';
-$name = '';
-$email = '';
+session_start();
 
 function sanitize_text(string $name) {
     $text = filter_var($_POST[$name], FILTER_SANITIZE_FULL_SPECIAL_CHARS);
@@ -39,7 +37,7 @@ function send_response($response_data) {
     echo $json;
 }
 
-if ($_SERVER["REQUEST_METHOD"] == "POST") {
+function prepare_response() {
     $response = array();
 
     if (empty($_POST['message'])) {
@@ -59,9 +57,8 @@ if ($_SERVER["REQUEST_METHOD"] == "POST") {
      */
     if (
         $_POST['captcha'] != 'Nudelsuppe' or
-        preg_match('/\d{10}/', $_POST['time_sent']) != 1 or
-        time() - intval($_POST['time_sent']) < 5 or
-        time() - intval($_POST['time_sent']) > 3600
+        time() - $_SESSION['start_time'] < 5 or
+        time() - $_SESSION['start_time'] > 3600
     ) {
         $response['errors'][] = 'Wir glauben du bist ein Bot.';
     }
@@ -76,6 +73,26 @@ if ($_SERVER["REQUEST_METHOD"] == "POST") {
             $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);