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Editing: admin-post.php

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<?php
/**
 * WordPress Generic Request (POST/GET) Handler
 *
 * Intended for form submission handling in themes and plugins.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** We are located in WordPress Administration Screens */
if ( ! defined( 'WP_ADMIN' ) ) {
	define( 'WP_ADMIN', true );
}

/** Load WordPress Bootstrap */
require_once dirname( __DIR__ ) . '/wp-load.php';

/** Allow for cross-domain requests (from the front end). */
send_origin_headers();

require_once ABSPATH . 'wp-admin/includes/admin.php';

nocache_headers();

/** This action is documented in wp-admin/admin.php */
do_action( 'admin_init' );

$action = ! empty( $_REQUEST['action'] ) ? sanitize_text_field( $_REQUEST['action'] ) : '';

// Reject invalid parameters.
if ( ! is_scalar( $action ) ) {
	wp_die( '', 400 );
}

if ( ! is_user_logged_in() ) {
	if ( empty( $action ) ) {
		/**
		 * Fires on a non-authenticated admin post request where no action is supplied.
		 *
		 * @since 2.6.0
		 */
		do_action( 'admin_post_nopriv' );
	} else {
		// If no action is registered, return a Bad Request response.
		if ( ! has_action( "admin_post_nopriv_{$action}" ) ) {
			wp_die( '', 400 );
		}

/**
		 * Fires on a non-authenticated admin post request for the given action.
		 *
		 * The dynamic portion of the hook name, `$action`, refers to the given
		 * request action.
		 *
		 * @since 2.6.0
		 */
		do_action( "admin_post_nopriv_{$action}" );
	}
} else {
	if ( empty( $action ) ) {
		/**
		 * Fires on an authenticated admin post request where no action is supplied.
		 *
		 * @since 2.6.0
		 */
		do_action( 'admin_post' );
	} else {
		// If no action is registered, return a Bad Request response.
		if ( ! has_action( "admin_post_{$action}" ) ) {
			wp_die( '', 400 );
		}

/**
		 * Fires on an authenticated admin post request for the given action.
		 *
		 * The dynamic portion of the hook name, `$action`, refers to the given
		 * request action.
		 *
		 * @since 2.6.0
		 */
		do_action( "admin_post_{$action}" );
	}
}

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Editing: admin-post.php

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