friendica/src/Core/PConfig.php

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<?php
namespace Friendica\Core;
use dba;
use dbm;
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/**
* @file include/Core/PConfig.php
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* @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.
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*/
class PConfig {
private static $in_db;
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/**
* @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) {
$a = get_app();
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$r = dba::select('pconfig', array('v', 'k'), array('cat' => $family, 'uid' => $uid));
if (dbm::is_result($r)) {
while ($rr = dba::fetch($r)) {
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$k = $rr['k'];
$a->config[$uid][$family][$k] = $rr['v'];
self::$in_db[$uid][$family][$k] = true;
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}
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dba::close($r);
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} else if ($family != 'config') {
// Negative caching
$a->config[$uid][$family] = "!<unset>!";
}
}
/**
* @brief Get a particular user's config variable given the category name
* ($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 $refresh optional
* If true the config is loaded from the db and not from the cache (default: false)
* @return mixed Stored value or null if it does not exist
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*/
public static function get($uid, $family, $key, $default_value = null, $refresh = false) {
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$a = get_app();
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if (!$refresh) {
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// Looking if the whole family isn't set
if (isset($a->config[$uid][$family])) {
if ($a->config[$uid][$family] === '!<unset>!') {
return $default_value;
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}
}
if (isset($a->config[$uid][$family][$key])) {
if ($a->config[$uid][$family][$key] === '!<unset>!') {
return $default_value;
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}
return $a->config[$uid][$family][$key];
}
}
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$ret = dba::select('pconfig', array('v'), array('uid' => $uid, 'cat' => $family, 'k' => $key), array('limit' => 1));
if (dbm::is_result($ret)) {
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$val = (preg_match("|^a:[0-9]+:{.*}$|s", $ret['v']) ? unserialize($ret['v']) : $ret['v']);
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$a->config[$uid][$family][$key] = $val;
self::$in_db[$uid][$family][$key] = true;
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return $val;
} else {
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$a->config[$uid][$family][$key] = '!<unset>!';
self::$in_db[$uid][$family][$key] = false;
return $default_value;
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}
}
/**
* @brief Sets a configuration value for a user
*
* Stores a config value ($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, $value) {
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$a = get_app();
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// 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;
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// manage array value
$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
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dba::update('pconfig', array('v' => $dbvalue), array('uid' => $uid, 'cat' => $family, 'k' => $key), true);
if ($ret) {
self::$in_db[$uid][$family][$key] = true;
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return $value;
}
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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 $key
* The configuration key to delete
* @return mixed
*/
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public static function delete($uid,$family,$key) {
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$a = get_app();
if (x($a->config[$uid][$family], $key)) {
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unset($a->config[$uid][$family][$key]);
unset(self::$in_db[$uid][$family][$key]);
}
$ret = dba::delete('pconfig', array('uid' => $uid, 'cat' => $family, 'k' => $key));
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return $ret;
}
}