friendica-github/src/Core/PConfig.php
2018-01-10 12:57:21 -05:00

177 lines
5 KiB
PHP

<?php
/**
* @file src/Core/PConfig.php
*/
namespace Friendica\Core;
use Friendica\Database\DBM;
use dba;
require_once 'include/dba.php';
/**
* @file include/Core/PConfig.php
* @brief contains the class with methods for the management
* of the user configuration
*/
/**
* @brief Management of user configuration storage
* Note:
* Please do not store booleans - convert to 0/1 integer values
* The PConfig::get() functions return boolean false for keys that are unset,
* and this could lead to subtle bugs.
*/
class PConfig
{
private static $in_db;
/**
* @brief Loads all configuration values of a user's config family into a cached storage.
*
* All configuration values of the given user are stored in global cache
* which is available under the global variable $a->config[$uid].
*
* @param string $uid The user_id
* @param string $family The category of the configuration value
*
* @return void
*/
public static function load($uid, $family)
{
$a = get_app();
$r = dba::select('pconfig', array('v', 'k'), array('cat' => $family, 'uid' => $uid));
if (DBM::is_result($r)) {
while ($rr = dba::fetch($r)) {
$k = $rr['k'];
$a->config[$uid][$family][$k] = $rr['v'];
self::$in_db[$uid][$family][$k] = true;
}
} else if ($family != 'config') {
// Negative caching
$a->config[$uid][$family] = "!<unset>!";
}
dba::close($r);
}
/**
* @brief Get a particular user's config variable given the category name
* ($family) and a key.
*
* Get a particular user's config value from the given category ($family)
* and the $key from a cached storage in $a->config[$uid].
*
* @param string $uid The user_id
* @param string $family The category of the configuration value
* @param string $key The configuration key to query
* @param mixed $default_value optional, The value to return if key is not set (default: null)
* @param boolean $refresh optional, If true the config is loaded from the db and not from the cache (default: false)
*
* @return mixed Stored value or null if it does not exist
*/
public static function get($uid, $family, $key, $default_value = null, $refresh = false)
{
$a = get_app();
if (!$refresh) {
// Looking if the whole family isn't set
if (isset($a->config[$uid][$family])) {
if ($a->config[$uid][$family] === '!<unset>!') {
return $default_value;
}
}
if (isset($a->config[$uid][$family][$key])) {
if ($a->config[$uid][$family][$key] === '!<unset>!') {
return $default_value;
}
return $a->config[$uid][$family][$key];
}
}
$ret = dba::selectFirst('pconfig', ['v'], ['uid' => $uid, 'cat' => $family, 'k' => $key]);
if (DBM::is_result($ret)) {
$val = (preg_match("|^a:[0-9]+:{.*}$|s", $ret['v']) ? unserialize($ret['v']) : $ret['v']);
$a->config[$uid][$family][$key] = $val;
self::$in_db[$uid][$family][$key] = true;
return $val;
} else {
$a->config[$uid][$family][$key] = '!<unset>!';
self::$in_db[$uid][$family][$key] = false;
return $default_value;
}
}
/**
* @brief Sets a configuration value for a user
*
* Stores a config value ($value) in the category ($family) under the key ($key)
* for the user_id $uid.
*
* @note Please do not store booleans - convert to 0/1 integer values!
*
* @param string $uid The user_id
* @param string $family The category of the configuration value
* @param string $key The configuration key to set
* @param string $value The value to store
*
* @return mixed Stored $value or false
*/
public static function set($uid, $family, $key, $value)
{
$a = get_app();
// We store our setting values in a string variable.
// So we have to do the conversion here so that the compare below works.
// The exception are array values.
$dbvalue = (!is_array($value) ? (string)$value : $value);
$stored = self::get($uid, $family, $key, null, true);
if (($stored === $dbvalue) && self::$in_db[$uid][$family][$key]) {
return true;
}
$a->config[$uid][$family][$key] = $dbvalue;
// manage array value
$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
$ret = dba::update('pconfig', array('v' => $dbvalue), array('uid' => $uid, 'cat' => $family, 'k' => $key), true);
if ($ret) {
self::$in_db[$uid][$family][$key] = true;
return $value;
}
return $ret;
}
/**
* @brief Deletes the given key from the users's configuration.
*
* Removes the configured value from the stored cache in $a->config[$uid]
* and removes it from the database.
*
* @param string $uid The user_id
* @param string $family The category of the configuration value
* @param string $key The configuration key to delete
*
* @return mixed
*/
public static function delete($uid, $family, $key)
{
$a = get_app();
if (x($a->config[$uid][$family], $key)) {
unset($a->config[$uid][$family][$key]);
unset(self::$in_db[$uid][$family][$key]);
}
$ret = dba::delete('pconfig', array('uid' => $uid, 'cat' => $family, 'k' => $key));
return $ret;
}
}