Don't strip characters from direct messages

includes/model/Message_model.php

@@ -1,6 +1,7 @@
 <?php
 
 use Engelsystem\Database\DB;
+use Engelsystem\Models\User\User;
 
 /**
  * Returns Message id array
@@ -26,7 +27,6 @@ function Message($message_id)
 }
 
 /**
- * TODO: use validation functions, return new message id
  * send message
  *
  * @param int    $receiver_user_id User ID of Receiver
@@ -36,20 +36,12 @@ function Message($message_id)
 function Message_send($receiver_user_id, $text)
 {
     $user = auth()->user();
+    $receiver = User::find($receiver_user_id);
 
-    $text = preg_replace("/([^\p{L}\p{P}\p{Z}\p{N}\n]{1,})/ui", '', strip_tags($text));
+    if (empty($text) || !$receiver || $receiver->id == $user->id) {
-    $receiver_user_id = preg_replace('/([^\d]{1,})/ui', '', strip_tags($receiver_user_id));
+        return false;
+    }
 
-    if (
-        ($text != '' && is_numeric($receiver_user_id))
-        && count(DB::select('
-            SELECT `id`
-            FROM `users`
-            WHERE `id` = ?
-            AND NOT `id` = ?
-            LIMIT 1
-        ', [$receiver_user_id, $user->id])) > 0
-    ) {
     return DB::insert('
             INSERT INTO `Messages` (`Datum`, `SUID`, `RUID`, `Text`)
             VALUES(?, ?, ?, ?)
@@ -57,11 +49,8 @@ function Message_send($receiver_user_id, $text)
         [
             time(),
             $user->id,
-                $receiver_user_id,
+            $receiver->id,
             $text
         ]
     );
-    }
-
-    return false;
 }

includes/pages/user_messages.php

@@ -88,7 +88,7 @@ function user_messages()
                 'timestamp' => date('Y-m-d H:i', $message['Datum']),
                 'from'      => User_Nick_render($sender_user_source),
                 'to'        => User_Nick_render($receiver_user_source),
-                'text'      => str_replace("\n", '<br />', $message['Text'])
+                'text'      => nl2br(htmlspecialchars($message['Text']))
             ];
 
             if ($message['RUID'] == $user->id) {
@@ -167,7 +167,6 @@ function user_messages()
                 break;
 
             case 'send':
-                // @TODO: Validation?
                 if (Message_send($request->input('to'), $request->input('text'))) {
                     redirect(page_link_to('user_messages'));
                 } else {

includes/sys_page.php

@@ -197,6 +197,7 @@ function strip_request_item_nl($name, $default_value = null)
 {
     $request = request();
     if ($request->has($name)) {
+        // Only allow letters, symbols, punctuation, separators, numbers and newlines without html tags
         return preg_replace(
             "/([^\p{L}\p{S}\p{P}\p{Z}\p{N}+\n]{1,})/ui",
             '',
@@ -214,6 +215,7 @@ function strip_request_item_nl($name, $default_value = null)
  */
 function strip_item($item)
 {
+    // Only allow letters, symbols, punctuation, separators and numbers without html tags
     return preg_replace("/([^\p{L}\p{S}\p{P}\p{Z}\p{N}+]{1,})/ui", '', strip_tags($item));
 }