5fc4927764
- Fix remaining $r[0] references - Rename $r to meaningful names
195 lines
5.5 KiB
PHP
195 lines
5.5 KiB
PHP
<?php
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/**
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* System Configuration Class
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*
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* @file include/Core/Config.php
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*
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* @brief Contains the class with methods for system configuration
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*/
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namespace Friendica\Core;
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use Friendica\Database\DBM;
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use dba;
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require_once 'include/dba.php';
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/**
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* @brief Arbitrary sytem configuration storage
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*
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* Note:
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* If we ever would decide to return exactly the variable type as entered,
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* we will have fun with the additional features. :-)
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*
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* The config class always returns strings but in the default features
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* we use a "false" to determine if the config value isn't set.
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*
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*/
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class Config
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{
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private static $cache;
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private static $in_db;
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/**
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* @brief Loads all configuration values of family into a cached storage.
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*
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* All configuration values of the system are stored in global cache
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* which is available under the global variable $a->config
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*
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* @param string $family The category of the configuration value
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*
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* @return void
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*/
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public static function load($family = "config")
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{
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// We don't preload "system" anymore.
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// This reduces the number of database reads a lot.
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if ($family === 'system') {
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return;
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}
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$a = get_app();
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$r = dba::select('config', array('v', 'k'), array('cat' => $family));
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while ($rr = dba::fetch($r)) {
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$k = $rr['k'];
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if ($family === 'config') {
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$a->config[$k] = $rr['v'];
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} else {
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$a->config[$family][$k] = $rr['v'];
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self::$cache[$family][$k] = $rr['v'];
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self::$in_db[$family][$k] = true;
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}
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}
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dba::close($r);
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}
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/**
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* @brief Get a particular user's config variable given the category name
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* ($family) and a key.
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*
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* Get a particular config value from the given category ($family)
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* and the $key from a cached storage in $a->config[$uid].
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* $instore is only used by the set_config function
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* to determine if the key already exists in the DB
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* If a key is found in the DB but doesn't exist in
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* local config cache, pull it into the cache so we don't have
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* to hit the DB again for this item.
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*
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* @param string $family The category of the configuration value
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* @param string $key The configuration key to query
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* @param mixed $default_value optional, The value to return if key is not set (default: null)
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* @param boolean $refresh optional, If true the config is loaded from the db and not from the cache (default: false)
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*
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* @return mixed Stored value or null if it does not exist
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*/
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public static function get($family, $key, $default_value = null, $refresh = false)
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{
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$a = get_app();
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if (!$refresh) {
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// Do we have the cached value? Then return it
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if (isset(self::$cache[$family][$key])) {
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if (self::$cache[$family][$key] === '!<unset>!') {
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return $default_value;
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} else {
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return self::$cache[$family][$key];
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}
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}
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}
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$config = dba::selectFirst('config', ['v'], ['cat' => $family, 'k' => $key]);
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if (DBM::is_result($config)) {
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// manage array value
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$val = (preg_match("|^a:[0-9]+:{.*}$|s", $config['v']) ? unserialize($config['v']) : $config['v']);
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// Assign the value from the database to the cache
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self::$cache[$family][$key] = $val;
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self::$in_db[$family][$key] = true;
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return $val;
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} elseif (isset($a->config[$family][$key])) {
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// Assign the value (mostly) from the .htconfig.php to the cache
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self::$cache[$family][$key] = $a->config[$family][$key];
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self::$in_db[$family][$key] = false;
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return $a->config[$family][$key];
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}
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self::$cache[$family][$key] = '!<unset>!';
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self::$in_db[$family][$key] = false;
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return $default_value;
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}
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/**
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* @brief Sets a configuration value for system config
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*
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* Stores a config value ($value) in the category ($family) under the key ($key)
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* for the user_id $uid.
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*
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* Note: Please do not store booleans - convert to 0/1 integer values!
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*
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* @param string $family The category of the configuration value
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* @param string $key The configuration key to set
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* @param mixed $value The value to store
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*
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* @return mixed Stored $value or false if the database update failed
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*/
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public static function set($family, $key, $value)
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{
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$a = get_app();
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// We store our setting values in a string variable.
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// So we have to do the conversion here so that the compare below works.
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// The exception are array values.
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$dbvalue = (!is_array($value) ? (string)$value : $value);
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$stored = self::get($family, $key, null, true);
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if (($stored === $dbvalue) && self::$in_db[$family][$key]) {
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return true;
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}
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if ($family === 'config') {
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$a->config[$key] = $dbvalue;
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} elseif ($family != 'system') {
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$a->config[$family][$key] = $dbvalue;
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}
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// Assign the just added value to the cache
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self::$cache[$family][$key] = $dbvalue;
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// manage array value
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$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
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$ret = dba::update('config', array('v' => $dbvalue), array('cat' => $family, 'k' => $key), true);
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if ($ret) {
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self::$in_db[$family][$key] = true;
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return $value;
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}
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return $ret;
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}
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/**
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* @brief Deletes the given key from the system configuration.
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*
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* Removes the configured value from the stored cache in $a->config
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* and removes it from the database.
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*
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* @param string $family The category of the configuration value
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* @param string $key The configuration key to delete
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*
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* @return mixed
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*/
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public static function delete($family, $key)
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{
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if (isset(self::$cache[$family][$key])) {
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unset(self::$cache[$family][$key]);
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unset(self::$in_db[$family][$key]);
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}
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$ret = dba::delete('config', array('cat' => $family, 'k' => $key));
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return $ret;
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}
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}
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