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<?php
/**
* Piwik - Open source web analytics
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
* @category Piwik
* @package Piwik
*/
namespace Piwik;
use Exception;
/**
* For general performance (and specifically, the Tracker), we use deferred (lazy) initialization
* and cache sections. We also avoid any dependency on Zend Framework's Zend_Config.
*
* We use a parse_ini_file() wrapper to parse the configuration files, in case php's built-in
* function is disabled.
*
* Example reading a value from the configuration:
*
* $minValue = Piwik_Config::getInstance()->General['minimum_memory_limit'];
*
* will read the value minimum_memory_limit under the [General] section of the config file.
*
* Example setting a section in the configuration:
*
* $brandingConfig = array(
* 'use_custom_logo' => 1,
* );
* Piwik_Config::getInstance()->branding = $brandingConfig;
*
* Example setting an option within a section in the configuration:
*
* $brandingConfig = Piwik_Config::getInstance()->branding;
* $brandingConfig['use_custom_logo'] = 1;
* Piwik_Config::getInstance()->branding = $brandingConfig;
*
* @package Piwik
* @subpackage Piwik_Config
*/
class Config
{
private static $instance = null;
/**
* Returns the singleton Piwik_Config
*
* @return \Piwik\Config
*/
public static function getInstance()
{
if (self::$instance == null) {
self::$instance = new self;
self::$instance->init();
Piwik_PostTestEvent('Config.createConfigSingleton', array(self::$instance));
}
return self::$instance;
}
/**
* Contains configuration files values
*
* @var array
*/
protected $initialized = false;
protected $configGlobal = array();
protected $configLocal = array();
protected $configCache = array();
protected $pathGlobal = null;
protected $pathLocal = null;
/**
* Constructor
*/
protected function __construct()
{
$this->pathGlobal = self::getGlobalConfigPath();
$this->pathLocal = self::getLocalConfigPath();
}
/**
* @var boolean
*/
protected $isTest = false;
/**
* Enable test environment
*
* @param string $pathLocal
* @param string $pathGlobal
*/
public function setTestEnvironment($pathLocal = null, $pathGlobal = null)
{
$this->isTest = true;
$this->clear();
if ($pathLocal) {
$this->pathLocal = $pathLocal;
}
if ($pathGlobal) {
$this->pathGlobal = $pathGlobal;
}
$this->init();
if (isset($this->configGlobal['database_tests'])
|| isset($this->configLocal['database_tests'])
) {
$this->__get('database_tests');
$this->configCache['database'] = $this->configCache['database_tests'];
}
// Ensure local mods do not affect tests
if (is_null($pathGlobal)) {
$this->configCache['Debug'] = $this->configGlobal['Debug'];
$this->configCache['branding'] = $this->configGlobal['branding'];
$this->configCache['mail'] = $this->configGlobal['mail'];
$this->configCache['General'] = $this->configGlobal['General'];
$this->configCache['Segments'] = $this->configGlobal['Segments'];
$this->configCache['Tracker'] = $this->configGlobal['Tracker'];
$this->configCache['Deletelogs'] = $this->configGlobal['Deletelogs'];
}
// for unit tests, we set that no plugin is installed. This will force
// the test initialization to create the plugins tables, execute ALTER queries, etc.
$this->configCache['PluginsInstalled'] = array('PluginsInstalled' => array());
if (isset($configGlobal['Plugins'])) {
$this->configCache['Plugins'] = $this->configGlobal['Plugins'];
$this->configCache['Plugins']['Plugins'][] = 'DevicesDetection';
}
$this->configCache['disable_merged_assets'] = 1;
}
/**
* Returns absolute path to the global configuration file
*
* @return string
*/
protected static function getGlobalConfigPath()
{
return PIWIK_USER_PATH . '/config/global.ini.php';
}
/**
* Returns absolute path to the local configuration file
*
* @return string
*/
public static function getLocalConfigPath()
{
return PIWIK_USER_PATH . '/config/config.ini.php';
}
/**
* Is local configuration file writable?
*
* @return bool
*/
public function isFileWritable()
{
return is_writable($this->pathLocal);
}
/**
* Clear in-memory configuration so it can be reloaded
*/
public function clear()
{
$this->configGlobal = array();
$this->configLocal = array();
$this->configCache = array();
$this->initialized = false;
$this->pathGlobal = self::getGlobalConfigPath();
$this->pathLocal = self::getLocalConfigPath();
}
/**
* Read configuration from files into memory
*
* @throws Exception if local config file is not readable; exits for other errors
*/
public function init()
{
$this->initialized = true;
$reportError = empty($GLOBALS['PIWIK_TRACKER_MODE']);
// read defaults from global.ini.php
if (!is_readable($this->pathGlobal) && $reportError) {
Piwik_ExitWithMessage(Piwik_TranslateException('General_ExceptionConfigurationFileNotFound', array($this->pathGlobal)));
}
$this->configGlobal = _parse_ini_file($this->pathGlobal, true);
if (empty($this->configGlobal) && $reportError) {
Piwik_ExitWithMessage(Piwik_TranslateException('General_ExceptionUnreadableFileDisabledMethod', array($this->pathGlobal, "parse_ini_file()")));
}
// read the local settings from config.ini.php
if (!is_readable($this->pathLocal) && $reportError) {
throw new Exception(Piwik_TranslateException('General_ExceptionConfigurationFileNotFound', array($this->pathLocal)));
}
$this->configLocal = _parse_ini_file($this->pathLocal, true);
if (empty($this->configLocal) && $reportError) {
Piwik_ExitWithMessage(Piwik_TranslateException('General_ExceptionUnreadableFileDisabledMethod', array($this->pathLocal, "parse_ini_file()")));
}
}
/**
* Decode HTML entities
*
* @param mixed $values
* @return mixed
*/
protected function decodeValues($values)
{
if (is_array($values)) {
foreach ($values as &$value) {
$value = $this->decodeValues($value);
}
} else {
$values = html_entity_decode($values, ENT_COMPAT, 'UTF-8');
}
return $values;
}
/**
* Encode HTML entities
*
* @param mixed $values
* @return mixed
*/
protected function encodeValues($values)
{
if (is_array($values)) {
foreach ($values as &$value) {
$value = $this->encodeValues($value);
}
} else {
$values = htmlentities($values, ENT_COMPAT, 'UTF-8');
}
return $values;
}
/**
* Magic get methods catching calls to $config->var_name
* Returns the value if found in the configuration
*
* @param string $name
* @return string|array The value requested, returned by reference
* @throws Exception if the value requested not found in both files
*/
public function &__get($name)
{
if (!$this->initialized) {
$this->init();
}
// check cache for merged section
if (isset($this->configCache[$name])) {
$tmp =& $this->configCache[$name];
return $tmp;
}
$section = $this->getFromDefaultConfig($name);
if (isset($this->configLocal[$name])) {
// local settings override the global defaults
$section = $section
? array_merge($section, $this->configLocal[$name])
: $this->configLocal[$name];
}
if ($section === null) {
throw new Exception("Error while trying to read a specific config file entry <strong>'$name'</strong> from your configuration files.</b>If you just completed a Piwik upgrade, please check that the file config/global.ini.php was overwritten by the latest Piwik version.");
}
// cache merged section for later
$this->configCache[$name] = $this->decodeValues($section);
$tmp =& $this->configCache[$name];
return $tmp;
}
public function getFromDefaultConfig($name)
{
if (isset($this->configGlobal[$name])) {
return $this->configGlobal[$name];
}
return null;
}
/**
* Set value
*
* @param string $name This corresponds to the section name
* @param mixed $value
*/
public function __set($name, $value)
{
$this->configCache[$name] = $value;
}
/**
* Comparison function
*
* @param mixed $elem1
* @param mixed $elem2
* @return int;
*/
public static function compareElements($elem1, $elem2)
{
if (is_array($elem1)) {
if (is_array($elem2)) {
return strcmp(serialize($elem1), serialize($elem2));
}
return 1;
}
if (is_array($elem2)) {
return -1;
}
if ((string)$elem1 === (string)$elem2) {
return 0;
}
return ((string)$elem1 > (string)$elem2) ? 1 : -1;
}
/**
* Compare arrays and return difference, such that:
*
* $modified = array_merge($original, $difference);
*
* @param array $original original array
* @param array $modified modified array
* @return array differences between original and modified
*/
public function array_unmerge($original, $modified)
{
// return key/value pairs for keys in $modified but not in $original
// return key/value pairs for keys in both $modified and $original, but values differ
// ignore keys that are in $original but not in $modified
return array_udiff_assoc($modified, $original, array(__CLASS__, 'compareElements'));
}
/**
* Dump config
*
* @param array $configLocal
* @param array $configGlobal
* @param array $configCache
* @return string
*/
public function dumpConfig($configLocal, $configGlobal, $configCache)
{
$dirty = false;
$output = "; <?php exit; ?> DO NOT REMOVE THIS LINE\n";
$output .= "; file automatically generated or modified by Piwik; you can manually override the default values in global.ini.php by redefining them in this file.\n";
if ($configCache) {
foreach ($configLocal as $name => $section) {
if (!isset($configCache[$name])) {
$configCache[$name] = $this->decodeValues($section);
}
}
$sectionNames = array_unique(array_merge(array_keys($configGlobal), array_keys($configCache)));
foreach ($sectionNames as $section) {
if (!isset($configCache[$section])) {
continue;
}
// Only merge if the section exists in global.ini.php (in case a section only lives in config.ini.php)
// get local and cached config
$local = isset($configLocal[$section]) ? $configLocal[$section] : array();
$config = $configCache[$section];
// remove default values from both (they should not get written to local)
if (isset($configGlobal[$section])) {
$config = $this->array_unmerge($configGlobal[$section], $configCache[$section]);
$local = $this->array_unmerge($configGlobal[$section], $local);
}
// if either local/config have non-default values and the other doesn't,
// OR both have values, but different values, we must write to config.ini.php
if (empty($local) xor empty($config)
|| (!empty($local)
&& !empty($config)
&& self::compareElements($config, $configLocal[$section]))
) {
$dirty = true;
}
// no point in writing empty sections, so skip if the cached section is empty
if (empty($config)) {
continue;
}
$output .= "[$section]\n";
foreach ($config as $name => $value) {
$value = $this->encodeValues($value);
if (is_numeric($name)) {
$name = $section;
$value = array($value);
}
if (is_array($value)) {
foreach ($value as $currentValue) {
$output .= $name . "[] = \"$currentValue\"\n";
}
} else {
if (!is_numeric($value)) {
$value = "\"$value\"";
}
$output .= $name . ' = ' . $value . "\n";
}
}
$output .= "\n";
}
if ($dirty) {
return $output;
}
}
return false;
}
/**
* Write user configuration file
*
* @param array $configLocal
* @param array $configGlobal
* @param array $configCache
* @param string $pathLocal
*/
public function writeConfig($configLocal, $configGlobal, $configCache, $pathLocal)
{
if ($this->isTest) {
return;
}
$output = $this->dumpConfig($configLocal, $configGlobal, $configCache);
if ($output !== false) {
@file_put_contents($pathLocal, $output);
}
$this->clear();
}
/**
* Force save
*/
public function forceSave()
{
$this->writeConfig($this->configLocal, $this->configGlobal, $this->configCache, $this->pathLocal);
}
}
|