remove extra from being manipulated from query string;

use extra in rand_string;

inc/Service/SecureimageCaptchaQuery.php

@@ -10,19 +10,16 @@ class SecureImageCaptchaQuery {
 	private HttpDriver $http;
 	private string $domain;
 	private string $provider_check;
-	private string $extra;
 
 	/**
 	 * @param HttpDriver $http The http client.
 	 * @param string $domain The server's domain.
 	 * @param string $provider_check Path to the endpoint.
-	 * @param string $extra Extra http parameters.
 	 */
-	function __construct(HttpDriver $http, string $domain, string $provider_check, string $extra) {
+	function __construct(HttpDriver $http, string $domain, string $provider_check) {
 		$this->http = $http;
 		$this->domain = $domain;
 		$this->provider_check = $provider_check;
-		$this->extra = $extra;
 	}
 
 	/**
@@ -37,7 +34,6 @@ class SecureImageCaptchaQuery {
 		$data = [
 			'mode' => 'check',
 			'text' => $user_text,
-			'extra' => $this->extra,
 			'cookie' => $user_cookie
 		];
 

inc/context.php

@@ -86,8 +86,7 @@ function build_context(array $config): Context {
 			return new SecureImageCaptchaQuery(
 				$c->get(HttpDriver::class),
 				$config['domain'],
-				$config['captcha']['native']['provider_check'],
+				$config['captcha']['native']['provider_check']
-				$config['captcha']['native']['extra']
 			);
 		},
 		CacheDriver::class => function($c) {

js/captcha.js

@@ -1,27 +1,27 @@
 var tout;
 
-function redo_events(provider, extra) {
+function redo_events(provider) {
-  $('.captcha .captcha_text, textarea[id="body"]').off("focus").one("focus", function() { actually_load_captcha(provider, extra); });
+  $('.captcha .captcha_text, textarea[id="body"]').off("focus").one("focus", function() { actually_load_captcha(provider); });
 }
 
-function actually_load_captcha(provider, extra) {
+function actually_load_captcha(provider) {
   $('.captcha .captcha_text, textarea[id="body"]').off("focus");
 
   if (tout !== undefined) {
     clearTimeout(tout);
   }
 
-  $.getJSON(provider, {mode: 'get', extra: extra}, function(json) {
+  $.getJSON(provider, {mode: 'get'}, function(json) {
     $(".captcha .captcha_cookie").val(json.cookie);
     $(".captcha .captcha_html").html(json.captchahtml);
 
     setTimeout(function() {
-      redo_events(provider, extra);      
+      redo_events(provider);      
     }, json.expires_in * 1000);
   });
 }
 
-function load_captcha(provider, extra) {
+function load_captcha(provider) {
   $(function() {
     $(".captcha>td").html("<input class='captcha_text' type='text' name='captcha_text' size='32' maxlength='6' autocomplete='off'>"+
 			  "<input class='captcha_cookie' name='captcha_cookie' type='hidden'>"+
@@ -29,15 +29,15 @@ function load_captcha(provider, extra) {
 
     $("#quick-reply .captcha .captcha_text").prop("placeholder", _("Verification"));
 
-    $(".captcha .captcha_html").on("click", function() { actually_load_captcha(provider, extra); });
+    $(".captcha .captcha_html").on("click", function() { actually_load_captcha(provider); });
-    $(document).on("ajax_after_post",       function() { actually_load_captcha(provider, extra); });
+    $(document).on("ajax_after_post",       function() { actually_load_captcha(provider); });
-    redo_events(provider, extra);
+    redo_events(provider);
 
     $(window).on("quick-reply", function() {
-      redo_events(provider, extra);
+      redo_events(provider);
       $("#quick-reply .captcha .captcha_html").html($("form:not(#quick-reply) .captcha .captcha_html").html());
       $("#quick-reply .captcha .captcha_cookie").val($("form:not(#quick-reply) .captcha .captcha_cookie").html());
-      $("#quick-reply .captcha .captcha_html").on("click", function() { actually_load_captcha(provider, extra); });
+      $("#quick-reply .captcha .captcha_html").on("click", function() { actually_load_captcha(provider); });
     });
   });
 }

securimage.php

@@ -19,13 +19,9 @@ function cleanup() {
 $mode = @$_GET['mode'];
 switch ($mode) {
 	case 'get':
-		if (!isset ($_GET['extra'])) {
-			$_GET['extra'] = $config['captcha']['extra'];
-		}
-
 		header("Content-type: application/json");
-		$extra = $_GET['extra'];
+		$extra = $config['captcha']['native']['extra'];
-		$cookie = rand_string(20, "abcdefghijklmnopqrstuvwxyz");
+		$cookie = rand_string(20, $extra);
 		$i = new Securimage(['send_headers' => false, 'no_exit' => true]);
 		$i->createCode();
 		ob_start();
@@ -47,12 +43,12 @@ switch ($mode) {
 		break;
 	case 'check':
 		cleanup();
-		if (!isset ($_GET['mode']) || !isset ($_GET['cookie']) || !isset ($_GET['extra']) || !isset ($_GET['text'])) {
+		if (!isset ($_GET['mode']) || !isset ($_GET['cookie']) || !isset ($_GET['text'])) {
 			die();
 		}
 
-		$query = prepare("SELECT * FROM `captchas` WHERE `cookie` = ? AND `extra` = ?");
+		$query = prepare("SELECT * FROM `captchas` WHERE `cookie` = ?");
-		$query->execute([$_GET['cookie'], $_GET['extra']]);
+		$query->execute([$_GET['cookie']]);
 
 		$ary = $query->fetchAll();
 
@@ -60,8 +56,8 @@ switch ($mode) {
 			echo "0";
 			break;
 		} else {
-			$query = prepare("DELETE FROM `captchas` WHERE `cookie` = ? AND `extra` = ?");
+			$query = prepare("DELETE FROM `captchas` WHERE `cookie` = ?");
-			$query->execute([$_GET['cookie'], $_GET['extra']]);
+			$query->execute([$_GET['cookie']]);
 		}
 
 		if ($ary[0]['text'] !== $_GET['text']) {