我在一个PHP脚本中，我想检查请求是否是Ajax请求。（除了Ajax调用之外，基本上不允许直接访问脚本。）
因此，我在主index.php文件中的某个位置定义IS_AJAX：
define('IS_AJAX',
isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&
strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest');
然后在我的脚本顶部检查：
if (!IS_AJAX) exit('No direct script access allowed');
由于我是CodeIgniter的新手，我想知道：
- 有这样的内置功能吗
- 有更优雅的方法吗
您可以从输入类使用$this->input->is_ajax_request()：
if (!$this->input->is_ajax_request()) {
exit('No direct script access allowed');
}
如果使用hook（CI文档），则不需要向每个AJAX方法添加if (!$this->input->is_ajax_request())。这是基于Jorge在这里的解决方案，并进行了一些轻微的改进：
config/config.php
通过更改默认值（来自FALSE）启用CI挂钩：
$config['enable_hooks'] = TRUE;
config/hooks.php
在末尾添加以下内容：
$hook['post_controller_constructor'] = array(
'class' => 'Ajax_only',
'function' => 'show_404_on_illegal_ajax',
'filename' => 'Ajax_only.php',
'filepath' => 'hooks'
);
post_controller_constructor：在控制器实例化后立即调用，但在发生任何方法调用之前
config/ajax_methods.php
创建一个包含所有控制器和方法的新配置文件，这些控制器和方法只应在发出AJAX请求时调用：
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
/*
|--------------------------------------------------------------------------
| References to all AJAX controllers' methods or the controller itself
|--------------------------------------------------------------------------
|
| Based on Jorge's solution: https://stackoverflow.com/a/43484330/6225838
| Key: controller name
| Possible values:
| - array: method name as key and boolean as value (TRUE => IS_AJAX)
| - boolean: TRUE if all the controller's methods are for AJAX requests
|
*/
$config['welcome'] = [
'index' => FALSE, // or 0 -> this line can be removed (just for reference)
'ajax_request_method_1' => TRUE, // or 1
'ajax_request_method_2' => TRUE, // or 1
];
$config['ajax_troller'] = TRUE;
hooks/Ajax_only.php
创建钩子本身，它检测当前控制器和/或其方法是否存在于上面的新配置文件中。如果是这样，当当前请求不是AJAX并且方法/控制器在config:中有truthy值时，它会显示404默认页面
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Ajax_only {
public function __construct()
{
$this->CI = &get_instance();
$this->CI->config->load('ajax_methods');
}
public function show_404_on_illegal_ajax()
{
$fetched_troller_val = $this->CI->config->item(
$this->CI->router->fetch_class()
);
$fetched_method = $this->CI->router->fetch_method();
$is_ajax_method = is_array($fetched_troller_val) &&
// verify if the method's name is present
isset($fetched_troller_val[$fetched_method]) &&
// verify if the value is truthy
$fetched_troller_val[$fetched_method];
// if the controller is not in the config file then
// config->item() returned NULL
if($fetched_troller_val !== NULL &&
$this->CI->input->is_ajax_request() === FALSE &&
($fetched_troller_val === TRUE || $is_ajax_method)
) {
show_404();
}
}
}
如果您想自定义来自代码点火器应用程序的请求，请尝试以下操作：您必须在application/hooks文件夹中创建一个名为Ajax_only.php的钩子
class Ajax_only {
private $_controllers = [];
private $CI;
public function __construct() {
$this->CI =& get_instance();
}
public function eval_request() {
$controller = $this->CI->router->fetch_class();
$method = $this->CI->router->fetch_method();
if ( array_key_exists( $controller, $this->_controllers ) && $this->CI->input->is_ajax_request() === FALSE ) {
if ( ( $this->_controllers[ $controller ] === TRUE || ( is_array( $this->_controllers[ $controller ] ) && array_key_exists( $method, $this->_controllers[ $controller ] ) && $this->_controllers[ $controller ][ $method ] === TRUE ) ) ) {
show_404();
}
}
}
}
/*Examples
* $_controllers = [
* 'my_controller_name' => TRUE //all methods must be ajax
* 'my_controller_name => [
* 'method_name' => TRUE //only the selected methods must be ajax
* ]
* ]
*/
并配置您的应用程序/config/hooks.php文件
$hook['post_controller_constructor'] = array(
'class' => 'Ajax_only',
'function' => 'eval_request',
'filename' => 'Ajax_only.php',
'filepath' => 'hooks'
);