晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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<?php
if (!defined('ABSPATH')) {
exit;
}
DigitsSessions::instance();
final class DigitsSessions
{
const TABLE_PREFIX = 'digits_user_session';
const USER_SESSION = 'd_user_session';
protected static $_instance = null;
public function __construct()
{
add_action('digits_create_database', array($this, 'activate'));
add_action('auth_cookie_expired', array($this, 'auth_cookie_expired'));
add_action('clear_auth_cookie', array($this, 'clear_auth_cookie'));
add_action('digits_cron', array($this, 'digits_cron'));
}
public static function get($key)
{
$session = self::get_token();
if (empty($session)) {
return false;
}
global $wpdb;
$table = self::get_table_name();
$query = $wpdb->prepare("SELECT * FROM $table WHERE session_token = %s and data_key = %s order by session_id DESC LIMIT 1", $session, $key);
$row = $wpdb->get_row($query);
if (empty($row)) {
return null;
}
if (strtotime($row->session_expiry) < time()) {
return null;
}
return $row->data_value;
}
public static function update_identifier_value($identifier_id, $value)
{
if (is_object($value) || is_array($value)) {
$value = json_encode($value);
}
global $wpdb;
$table = self::get_table_name();
$query = $wpdb->prepare("SELECT * FROM $table WHERE identifier_id = %s order by session_id DESC LIMIT 1", $identifier_id);
$row = $wpdb->get_row($query);
if (empty($row)) {
return null;
}
$data = array('data_value' => $value);
$where = array('identifier_id' => $identifier_id);
return $wpdb->update($table, $data, $where);
}
public static function get_from_identifier($identifier_id, $get_row = false)
{
global $wpdb;
$table = self::get_table_name();
$query = $wpdb->prepare("SELECT * FROM $table WHERE identifier_id = %s order by session_id DESC LIMIT 1", $identifier_id);
$row = $wpdb->get_row($query);
if (empty($row)) {
return null;
}
if (strtotime($row->session_expiry) < time()) {
return null;
}
if ($get_row) {
return $row;
}
return $row->data_value;
}
public static function get_from_key_identifier($key, $identifier_id, $get_row = false)
{
$session = self::get_token();
if (empty($session)) {
return false;
}
global $wpdb;
$table = self::get_table_name();
$query = "SELECT * FROM $table WHERE session_token = %s and data_key = %s AND identifier_id = %s order by session_id DESC LIMIT 1";
$query = $wpdb->prepare($query, $session, $key, $identifier_id);
$row = $wpdb->get_row($query);
if (empty($row)) {
return null;
}
if (strtotime($row->session_expiry) < time()) {
return null;
}
if ($get_row) {
return $row;
}
return $row->data_value;
}
public static function get_token()
{
if (is_user_logged_in()) {
return wp_get_session_token();
} else {
if (empty($_COOKIE[self::USER_SESSION])) {
$value = self::instance()->generate_id();
setcookie(self::USER_SESSION, $value, 0, SITECOOKIEPATH, COOKIE_DOMAIN, is_ssl());
return $value;
} else {
return $_COOKIE[self::USER_SESSION];
}
}
}
/**
* Generate a cryptographically strong unique ID for the session token.
*
* @return string
*/
public function generate_id()
{
return bin2hex(random_bytes(64));
}
/**
* Constructor.
*/
public static function instance()
{
if (is_null(self::$_instance)) {
self::$_instance = new self();
}
return self::$_instance;
}
public static function get_table_name()
{
global $wpdb;
return $wpdb->prefix . self::TABLE_PREFIX;
}
public static function delete_user_key($user_id, $key)
{
if (empty($user_id) || !is_numeric($user_id)) {
return false;
}
global $wpdb;
$table = self::get_table_name();
$data = array();
$data['user_id'] = $user_id;
$data['data_key'] = $key;
return $wpdb->delete($table, $data);
}
public static function update($key, $value, $expiry_time, $identifier = false)
{
self::delete($key);
return self::set($key, $value, $expiry_time, $identifier);
}
public static function set($key, $value, $expiry_time, $identifier = false)
{
$session = self::get_token();
return self::set_session_value($session, $key, $value, $expiry_time, $identifier);
}
public static function set_session_value($session, $key, $value, $expiry_time, $identifier = false)
{
if (empty($session)) {
return false;
}
if (is_object($value) || is_array($value)) {
$value = json_encode($value);
}
global $wpdb;
$table = self::get_table_name();
$data = array('session_token' => $session);
$data['user_id'] = get_current_user_id();
$data['data_key'] = $key;
$data['data_value'] = $value;
if (!empty($expiry_time)) {
$data['session_expiry'] = date("Y-m-d H:i:s", time() + $expiry_time);
}
$data['time'] = date("Y-m-d H:i:s", time());
if (!empty($identifier)) {
$data['identifier_id'] = $identifier;
}
return $wpdb->insert($table, $data);
}
public static function delete_identifier($identifier_id)
{
if (empty($identifier_id)) {
return false;
}
global $wpdb;
$table = self::get_table_name();
$where = array('identifier_id' => $identifier_id);
return $wpdb->delete($table, $where);
}
public static function delete($key)
{
$session = self::get_token();
if (empty($session)) {
return false;
}
global $wpdb;
$table = self::get_table_name();
$where = array('data_key' => $key, 'session_token' => $session);
return $wpdb->delete($table, $where);
}
public function auth_cookie_expired($cookie_elements)
{
$token = $cookie_elements['token'];
$this->_destroy_session($token);
}
public function clear_auth_cookie()
{
$this->destroy_session();
}
public function destroy_session()
{
$token = self::get_token();
$this->_destroy_session($token);
}
public function create_new_session()
{
$this->destroy_session();
}
public function _destroy_session($session = false)
{
if (empty($session)) {
return;
}
global $wpdb;
$table = self::get_table_name();
$where = array('session_token' => $session);
$wpdb->delete($table, $where);
}
public function activate()
{
global $wpdb;
$tb = $this->get_table_name();
if ($wpdb->get_var("SHOW TABLES LIKE '$tb'") != $tb) {
$charset_collate = $wpdb->get_charset_collate();
$sql = "CREATE TABLE $tb (
session_id BIGINT UNSIGNED NOT NULL auto_increment,
identifier_id VARCHAR(255) NOT NULL,
session_token TEXT NOT NULL,
user_id BIGINT UNSIGNED NULL,
data_key LONGTEXT NOT NULL,
data_value LONGTEXT NOT NULL,
session_expiry datetime DEFAULT CURRENT_TIMESTAMP NOT NULL,
time datetime DEFAULT CURRENT_TIMESTAMP NOT NULL,
PRIMARY KEY (session_id),
INDEX idx_identifier_id (identifier_id)
) $charset_collate;";
dbDelta(array($sql));
}
}
public function digits_cron()
{
global $wpdb;
$tb = $this->get_table_name();
$sql = $wpdb->prepare("DELETE FROM $tb WHERE `session_expiry` < DATE_SUB( NOW(), INTERVAL 1 DAY)");
$wpdb->get_results($sql);
}
}