pluggable-functions.php

php 开发的内容管理系统

<?php

	/* These functions can be replaced via plugins.  They are loaded after
	 plugins are loaded. */

if ( !function_exists('set_current_user') ) :
function set_current_user($id, $name = '') {
	return wp_set_current_user($id, $name);
}
endif;

if ( !function_exists('wp_set_current_user') ) :
function wp_set_current_user($id, $name = '') {
	global $current_user;

	if ( isset($current_user) && ($id == $current_user->ID) )
		return $current_user;

	$current_user = new WP_User($id, $name);

	setup_userdata($current_user->ID);

	do_action('set_current_user');

	return $current_user;
}
endif;

if ( !function_exists('wp_get_current_user') ) :
function wp_get_current_user() {
	global $current_user;

	get_currentuserinfo();

	return $current_user;
}
endif;

if ( !function_exists('get_currentuserinfo') ) :
function get_currentuserinfo() {
	global $current_user;

	if ( defined('XMLRPC_REQUEST') && XMLRPC_REQUEST )
		return false;

	if ( ! empty($current_user) )
		return;

	if ( empty($_COOKIE[USER_COOKIE]) || empty($_COOKIE[PASS_COOKIE]) || 
		!wp_login($_COOKIE[USER_COOKIE], $_COOKIE[PASS_COOKIE], true) ) {
		wp_set_current_user(0);
		return false;
	}

	$user_login = $_COOKIE[USER_COOKIE];
	wp_set_current_user(0, $user_login);
}
endif;

if ( !function_exists('get_userdata') ) :
function get_userdata( $user_id ) {
	global $wpdb;
	$user_id = (int) $user_id;
	if ( $user_id == 0 )
		return false;

	$user = wp_cache_get($user_id, 'users');
	
	if ( $user )
		return $user;

	if ( !$user = $wpdb->get_row("SELECT * FROM $wpdb->users WHERE ID = '$user_id' LIMIT 1") )
		return false;

	$wpdb->hide_errors();
	$metavalues = $wpdb->get_results("SELECT meta_key, meta_value FROM $wpdb->usermeta WHERE user_id = '$user_id'");
	$wpdb->show_errors();

	if ($metavalues) {
		foreach ( $metavalues as $meta ) {
			@ $value = unserialize($meta->meta_value);
			if ($value === FALSE)
				$value = $meta->meta_value;
			$user->{$meta->meta_key} = $value;

			// We need to set user_level from meta, not row
			if ( $wpdb->prefix . 'user_level' == $meta->meta_key )
				$user->user_level = $meta->meta_value;
		} // end foreach
	} //end if

	// For backwards compat.
	if ( isset($user->first_name) )
		$user->user_firstname = $user->first_name;
	if ( isset($user->last_name) )
		$user->user_lastname = $user->last_name;
	if ( isset($user->description) )
		$user->user_description = $user->description;
		
	wp_cache_add($user_id, $user, 'users');
	wp_cache_add($user->user_login, $user, 'userlogins');
	
	return $user;
}
endif;

if ( !function_exists('update_user_cache') ) :
function update_user_cache() {
	return true;
}
endif;

if ( !function_exists('get_userdatabylogin') ) :
function get_userdatabylogin($user_login) {
	global $wpdb;
	$user_login = sanitize_user( $user_login );

	if ( empty( $user_login ) )
		return false;
		
	$userdata = wp_cache_get($user_login, 'userlogins');
	if ( $userdata )
		return $userdata;

	if ( !$user = $wpdb->get_row("SELECT * FROM $wpdb->users WHERE user_login = '$user_login'") )
		return false;

	$wpdb->hide_errors();
	$metavalues = $wpdb->get_results("SELECT meta_key, meta_value FROM $wpdb->usermeta WHERE user_id = '$user->ID'");
	$wpdb->show_errors();

	if ($metavalues) {
		foreach ( $metavalues as $meta ) {
			@ $value = unserialize($meta->meta_value);
			if ($value === FALSE)
				$value = $meta->meta_value;
			$user->{$meta->meta_key} = $value;

			// We need to set user_level from meta, not row
			if ( $wpdb->prefix . 'user_level' == $meta->meta_key )
				$user->user_level = $meta->meta_value;
		}
	}

	// For backwards compat.
	if ( isset($user->first_name) )
		$user->user_firstname = $user->first_name;
	if ( isset($user->last_name) )
		$user->user_lastname = $user->last_name;
	if ( isset($user->description) )
		$user->user_description = $user->description;

	wp_cache_add($user->ID, $user, 'users');
	wp_cache_add($user->user_login, $user, 'userlogins');

	return $user;

}
endif;

if ( !function_exists('wp_mail') ) :
function wp_mail($to, $subject, $message, $headers = '') {
	if( $headers == '' ) {
		$headers = "MIME-Version: 1.0\n" .
			"From: wordpress@" . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME'])) . "\n" . 
			"Content-Type: text/plain; charset=\"" . get_settings('blog_charset') . "\"\n";
	}

	return @mail($to, $subject, $message, $headers);
}
endif;

if ( !function_exists('wp_login') ) :
function wp_login($username, $password, $already_md5 = false) {
	global $wpdb, $error;

	if ( '' == $username )
		return false;

	if ( '' == $password ) {
		$error = __('<strong>Error</strong>: The password field is empty.');
		return false;
	}

	$login = get_userdatabylogin($username);
	//$login = $wpdb->get_row("SELECT ID, user_login, user_pass FROM $wpdb->users WHERE user_login = '$username'");

	if (!$login) {
		$error = __('<strong>Error</strong>: Wrong username.');
		return false;
	} else {
		// If the password is already_md5, it has been double hashed.
		// Otherwise, it is plain text.
		if ( ($already_md5 && md5($login->user_pass) == $password) || ($login->user_login == $username && $login->user_pass == md5($password)) ) {
			return true;
		} else {
			$error = __('<strong>Error</strong>: Incorrect password.');
			$pwd = '';
			return false;
		}
	}
}
endif;

if ( !function_exists('is_user_logged_in') ) :
function is_user_logged_in() {
	$user = wp_get_current_user();
	
	if ( $user->id == 0 )
		return false;

	return true;
}
endif;

if ( !function_exists('auth_redirect') ) :
function auth_redirect() {
	// Checks if a user is logged in, if not redirects them to the login page
	if ( (!empty($_COOKIE[USER_COOKIE]) && 
				!wp_login($_COOKIE[USER_COOKIE], $_COOKIE[PASS_COOKIE], true)) ||
			 (empty($_COOKIE[USER_COOKIE])) ) {
		nocache_headers();
	
		wp_redirect(get_settings('siteurl') . '/wp-login.php?redirect_to=' . urlencode($_SERVER['REQUEST_URI']));
		exit();
	}
}
endif;

if ( !function_exists('check_admin_referer') ) :
function check_admin_referer($action = -1) {
	$adminurl = strtolower(get_settings('siteurl')).'/wp-admin';
	$referer = strtolower(wp_get_referer());
	if ( !wp_verify_nonce($_REQUEST['_wpnonce'], $action) &&
		!(-1 == $action && strstr($referer, $adminurl)) ) {
		wp_nonce_ays($action);
		die();
	}
	do_action('check_admin_referer', $action);
}
endif;

if ( !function_exists('check_ajax_referer') ) :
function check_ajax_referer() {
	$cookie = explode('; ', urldecode(empty($_POST['cookie']) ? $_GET['cookie'] : $_POST['cookie'])); // AJAX scripts must pass cookie=document.cookie
	foreach ( $cookie as $tasty ) {
		if ( false !== strpos($tasty, USER_COOKIE) )
			$user = urldecode(substr(strstr($tasty, '='), 1)); // Nasty double encoding
		if ( false !== strpos($tasty, PASS_COOKIE) )
			$pass = urldecode(substr(strstr($tasty, '='), 1));
	}
	if ( wp_login( $user, $pass, true ) )
		return true;
	return false;
}
endif;

// Cookie safe redirect.  Works around IIS Set-Cookie bug.