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File: SiteConfiguration.php
<?php /** * Configuration holder, particularly for multi-wiki sites. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ use MediaWiki\Shell\Shell; /** * This is a class for holding configuration settings, particularly for * multi-wiki sites. * * A basic synopsis: * * Consider a wikifarm having three sites: two production sites, one in English * and one in German, and one testing site. You can assign them easy-to-remember * identifiers - ISO 639 codes 'en' and 'de' for language wikis, and 'beta' for * the testing wiki. * * You would thus initialize the site configuration by specifying the wiki * identifiers: * * @code * $conf = new SiteConfiguration; * $conf->wikis = [ 'de', 'en', 'beta' ]; * @endcode * * When configuring the MediaWiki global settings (the $wg variables), * the identifiers will be available to specify settings on a per wiki basis. * * @code * $conf->settings = [ * 'wgSomeSetting' => [ * * # production: * 'de' => false, * 'en' => false, * * # test: * 'beta => true, * ], * ]; * @endcode * * With three wikis, that is easy to manage. But what about a farm with * hundreds of wikis? Site configuration provides a special keyword named * 'default' which is the value used when a wiki is not found. Hence * the above code could be written: * * @code * $conf->settings = [ * 'wgSomeSetting' => [ * * 'default' => false, * * # Enable feature on test * 'beta' => true, * ], * ]; * @endcode * * * Since settings can contain arrays, site configuration provides a way * to merge an array with the default. This is very useful to avoid * repeating settings again and again while still maintaining specific changes * on a per wiki basis. * * @code * $conf->settings = [ * 'wgMergeSetting' = [ * # Value that will be shared among all wikis: * 'default' => [ NS_USER => true ], * * # Leading '+' means merging the array of value with the defaults * '+beta' => [ NS_HELP => true ], * ], * ]; * * # Get configuration for the German site: * $conf->get( 'wgMergeSetting', 'de' ); * // --> [ NS_USER => true ]; * * # Get configuration for the testing site: * $conf->get( 'wgMergeSetting', 'beta' ); * // --> [ NS_USER => true, NS_HELP => true ]; * @endcode * * Finally, to load all configuration settings, extract them in global context: * * @code * # Name / identifier of the wiki as set in $conf->wikis * $wikiID = 'beta'; * $globals = $conf->getAll( $wikiID ); * extract( $globals ); * @endcode * * Simple suffix system where "pt_brwiki" becomes lang="pt-br", site="wiki": * * @code * $conf->suffixes[] = 'wiki'; * @endcode * * Suffix is resolved as an alias, so "dewiki" becomes lang="de", site="wikipedia": * @code * $conf->suffixes['wikipedia'] = 'wiki'; * @endcode * * @note For WikiMap to function, the configuration must define string values for * $wgServer (or $wgCanonicalServer) and $wgArticlePath, even if these are the * same for all wikis or can be correctly determined by the logic in * Setup.php. */ class SiteConfiguration { /** * Array of suffixes, for self::siteFromDB() */ public $suffixes = []; /** * Array of wikis, should be the same as $wgLocalDatabases */ public $wikis = []; /** * The whole array of settings */ public $settings = []; /** * Optional callback to load full configuration data. * @var string|array */ public $fullLoadCallback = null; /** Whether or not all data has been loaded */ public $fullLoadDone = false; /** * A callback function that returns an array with the following keys (all * optional): * - suffix: site's suffix * - lang: site's lang * - tags: array of wiki tags * - params: array of parameters to be replaced * The function will receive the SiteConfiguration instance in the first * argument and the wiki in the second one. * if suffix and lang are passed they will be used for the return value of * self::siteFromDB() and self::$suffixes will be ignored * * @var callable|null */ public $siteParamsCallback = null; /** * Configuration cache for getConfig() * @var array */ protected $cfgCache = []; /** * Retrieves a configuration setting for a given wiki. * @param string $settingName ID of the setting name to retrieve * @param string $wiki Wiki ID of the wiki in question. * @param string|null $suffix The suffix of the wiki in question. * @param array $params List of parameters. $.'key' is replaced by $value in all returned data. * @param array $wikiTags The tags assigned to the wiki. * @return mixed The value of the setting requested. */ public function get( $settingName, $wiki, $suffix = null, $params = [], $wikiTags = [] ) { $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags ); $overrides = $this->settings[$settingName] ?? null; return $overrides ? $this->processSetting( $overrides, $wiki, $params ) : null; } /** * Retrieve the configuration setting for a given wiki, based on an overrides array. * * General order of precedence: * * 1. Wiki ID, an override specific to the given wiki. * 2. Tag, an override specific to a group of wikis (e.g. wiki family, or db * shard). It is unsupported for the same setting to be set for multiple * tags of which the wiki groups overlap. In that case, whichever is * iterated and matched first wins, where the tag iteration order * is NOT guaranteed. * 3. Default, the default value for all wikis in this wiki farm. * * If the "+" operator is used, with any of these, then the merges will follow the * following order (earlier entries have precedence on clashing sub keys): * * 1. "+wiki" * 2. "tag" * Only one may match here. And upon match, the merge cascade stops. * 3. "+tag" * These are only considered if there was no "tag" match. * Multiple matches are allowed here, although the array values from * multiple tags that contain the same wiki must not overlap, as it is * undocumented how key conflicts among them would be handled. * 4. "default" * * @param array $thisSetting An array of overrides for a given setting. * @param string $wiki Wiki ID of the wiki in question. * @param array $params Array of parameters. * @return mixed The value of the setting requested. */ private function processSetting( array $thisSetting, $wiki, array $params ) { $retval = null; if ( array_key_exists( $wiki, $thisSetting ) ) { // Found override by Wiki ID. $retval = $thisSetting[$wiki]; } else { if ( array_key_exists( "+$wiki", $thisSetting ) && is_array( $thisSetting["+$wiki"] ) ) { // Found mergable override by Wiki ID. // We continue to look for more merge candidates. $retval = $thisSetting["+$wiki"]; } $done = false; foreach ( $params['tags'] as $tag ) { if ( array_key_exists( $tag, $thisSetting ) ) { if ( is_array( $retval ) && is_array( $thisSetting[$tag] ) ) { // Found a mergable override by Tag, without "+" operator. // Merge it with any "+wiki" match from before, and stop the cascade. $retval = self::arrayMerge( $retval, $thisSetting[$tag] ); } else { // Found a non-mergable override by Tag. // This could in theory replace a "+wiki" match, but it should never happen // that a setting uses both mergable array values and non-array values. $retval = $thisSetting[$tag]; } $done = true; break; } elseif ( array_key_exists( "+$tag", $thisSetting ) && is_array( $thisSetting["+$tag"] ) ) { // Found a mergable override by Tag with "+" operator. // Merge it with any "+wiki" or "+tag" matches from before, // and keep looking for more merge candidates. $retval = self::arrayMerge( $retval ?? [], $thisSetting["+$tag"] ); } } if ( !$done && array_key_exists( 'default', $thisSetting ) ) { if ( is_array( $retval ) && is_array( $thisSetting['default'] ) ) { // Found a mergable default // Merge it with any "+wiki" or "+tag" matches from before. $retval = self::arrayMerge( $retval, $thisSetting['default'] ); } else { // Found a default // If any array-based values were built up via "+wiki" or "+tag" matches, // these are thrown away here. We don't support merging array values into // non-array values, and the fallback here is to use the default. $retval = $thisSetting['default']; } } } // Type-safe string replacements, don't do replacements on non-strings. if ( is_string( $retval ) ) { $retval = strtr( $retval, $params['replacements'] ); } elseif ( is_array( $retval ) ) { foreach ( $retval as &$val ) { if ( is_string( $val ) ) { $val = strtr( $val, $params['replacements'] ); } } } return $retval; } /** * Gets all settings for a wiki * @param string $wiki Wiki ID of the wiki in question. * @param string|null $suffix The suffix of the wiki in question. * @param array $params List of parameters. $.'key' is replaced by $value in all returned data. * @param array $wikiTags The tags assigned to the wiki. * @return array Array of settings requested. */ public function getAll( $wiki, $suffix = null, $params = [], $wikiTags = [] ) { $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags ); $localSettings = []; foreach ( $this->settings as $varname => $overrides ) { $append = substr( $varname, 0, 1 ) === '+'; $var = $append ? substr( $varname, 1 ) : $varname; $value = $this->processSetting( $overrides, $wiki, $params ); if ( $append && is_array( $value ) && is_array( $GLOBALS[$var] ) ) { $value = self::arrayMerge( $value, $GLOBALS[$var] ); } if ( $value !== null ) { $localSettings[$var] = $value; } } return $localSettings; } /** * Retrieves a configuration setting for a given wiki, forced to a boolean. * @param string $setting ID of the setting name to retrieve * @param string $wiki Wiki ID of the wiki in question. * @param string|null $suffix The suffix of the wiki in question. * @param array $wikiTags The tags assigned to the wiki. * @return bool The value of the setting requested. */ public function getBool( $setting, $wiki, $suffix = null, $wikiTags = [] ) { return (bool)$this->get( $setting, $wiki, $suffix, [], $wikiTags ); } /** * Retrieves an array of local databases * * @return array */ public function getLocalDatabases() { return $this->wikis; } /** * Retrieves the value of a given setting, and places it in a variable passed by reference. * @param string $setting ID of the setting name to retrieve * @param string $wiki Wiki ID of the wiki in question. * @param string $suffix The suffix of the wiki in question. * @param array &$var Reference The variable to insert the value into. * @param array $params List of parameters. $.'key' is replaced by $value in all returned data. * @param array $wikiTags The tags assigned to the wiki. */ public function extractVar( $setting, $wiki, $suffix, &$var, $params = [], $wikiTags = [] ) { $value = $this->get( $setting, $wiki, $suffix, $params, $wikiTags ); if ( $value !== null ) { $var = $value; } } /** * Retrieves the value of a given setting, and places it in its corresponding global variable. * @param string $setting ID of the setting name to retrieve * @param string $wiki Wiki ID of the wiki in question. * @param string|null $suffix The suffix of the wiki in question. * @param array $params List of parameters. $.'key' is replaced by $value in all returned data. * @param array $wikiTags The tags assigned to the wiki. */ public function extractGlobal( $setting, $wiki, $suffix = null, $params = [], $wikiTags = [] ) { $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags ); $this->extractGlobalSetting( $setting, $wiki, $params ); } /** * @param string $setting * @param string $wiki * @param array $params */ public function extractGlobalSetting( $setting, $wiki, $params ) { $overrides = $this->settings[$setting] ?? null; $value = $overrides ? $this->processSetting( $overrides, $wiki, $params ) : null; if ( $value !== null ) { if ( substr( $setting, 0, 1 ) == '+' && is_array( $value ) ) { $setting = substr( $setting, 1 ); if ( is_array( $GLOBALS[$setting] ) ) { $GLOBALS[$setting] = self::arrayMerge( $GLOBALS[$setting], $value ); } else { $GLOBALS[$setting] = $value; } } else { $GLOBALS[$setting] = $value; } } } /** * Retrieves the values of all settings, and places them in their corresponding global variables. * @param string $wiki Wiki ID of the wiki in question. * @param string|null $suffix The suffix of the wiki in question. * @param array $params List of parameters. $.'key' is replaced by $value in all returned data. * @param array $wikiTags The tags assigned to the wiki. */ public function extractAllGlobals( $wiki, $suffix = null, $params = [], $wikiTags = [] ) { $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags ); foreach ( $this->settings as $varName => $setting ) { $this->extractGlobalSetting( $varName, $wiki, $params ); } } /** * Return specific settings for $wiki * See the documentation of self::$siteParamsCallback for more in-depth * documentation about this function * * @param string $wiki * @return array */ protected function getWikiParams( $wiki ) { static $default = [ 'suffix' => null, 'lang' => null, 'tags' => [], 'params' => [], ]; if ( !is_callable( $this->siteParamsCallback ) ) { return $default; } $ret = ( $this->siteParamsCallback )( $this, $wiki ); # Validate the returned value if ( !is_array( $ret ) ) { return $default; } foreach ( $default as $name => $def ) { if ( !isset( $ret[$name] ) || ( is_array( $def ) && !is_array( $ret[$name] ) ) ) { $ret[$name] = $def; } } return $ret; } /** * Merge params between the ones passed to the function and the ones given * by self::$siteParamsCallback for backward compatibility * Values returned by self::getWikiParams() have the priority. * * @param string $wiki Wiki ID of the wiki in question. * @param string|null $suffix The suffix of the wiki in question. * @param array $params List of parameters. $.'key' is replaced by $value in * all returned data. * @param array $wikiTags The tags assigned to the wiki. * @return array */ protected function mergeParams( $wiki, $suffix, array $params, array $wikiTags ) { $ret = $this->getWikiParams( $wiki ); if ( $ret['suffix'] === null ) { $ret['suffix'] = $suffix; } // Make tags based on the db suffix (e.g. wiki family) automatically // available for use in wgConf. The user does not have to maintain // wiki tag lookups (e.g. dblists at WMF) for the wiki family. $wikiTags[] = $ret['suffix']; $ret['tags'] = array_unique( array_merge( $ret['tags'], $wikiTags ) ); $ret['params'] += $params; // Make the $lang and $site parameters automatically available if they // were provided by `siteParamsCallback` via getWikiParams() if ( !isset( $ret['params']['lang'] ) && $ret['lang'] !== null ) { $ret['params']['lang'] = $ret['lang']; } if ( !isset( $ret['params']['site'] ) && $ret['suffix'] !== null ) { $ret['params']['site'] = $ret['suffix']; } // Precompute the replacements to allow re-use over hundreds of processSetting() // calls, as optimisation for getAll() and extractAllGlobals(). $ret['replacements'] = []; foreach ( $ret['params'] as $key => $value ) { $ret['replacements'][ '$' . $key ] = $value; } return $ret; } /** * Work out the site and language name from a database name * @param string $wiki Wiki ID * * @return array [ string|null $site, string|null $languageCode ] */ public function siteFromDB( $wiki ) { // Allow override $def = $this->getWikiParams( $wiki ); if ( $def['suffix'] !== null && $def['lang'] !== null ) { return [ $def['suffix'], $def['lang'] ]; } $languageCode = str_replace( '_', '-', $wiki ); foreach ( $this->suffixes as $altSite => $suffix ) { if ( $suffix === '' ) { return [ '', $languageCode ]; } elseif ( substr( $wiki, -strlen( $suffix ) ) === $suffix ) { $site = is_string( $altSite ) ? $altSite : $suffix; $languageCode = substr( $languageCode, 0, -strlen( $suffix ) ); return [ $site, $languageCode ]; } } return [ null, null ]; } /** * Get the resolved (post-setup) configuration of a potentially foreign wiki. * For foreign wikis, this is expensive, and only works if maintenance * scripts are setup to handle the --wiki parameter such as in wiki farms. * * @param string $wiki * @param string|string[] $settings A setting name or array of setting names * @return mixed|mixed[] Array if $settings is an array, otherwise the value * @throws MWException * @since 1.21 */ public function getConfig( $wiki, $settings ) { $multi = is_array( $settings ); $settings = (array)$settings; if ( WikiMap::isCurrentWikiId( $wiki ) ) { // $wiki is this wiki $res = []; foreach ( $settings as $name ) { if ( !preg_match( '/^wg[A-Z]/', $name ) ) { throw new MWException( "Variable '$name' does start with 'wg'." ); } elseif ( !isset( $GLOBALS[$name] ) ) { throw new MWException( "Variable '$name' is not set." ); } $res[$name] = $GLOBALS[$name]; } } else { // $wiki is a foreign wiki if ( isset( $this->cfgCache[$wiki] ) ) { $res = array_intersect_key( $this->cfgCache[$wiki], array_fill_keys( $settings, true ) ); if ( count( $res ) == count( $settings ) ) { return $multi ? $res : current( $res ); // cache hit } } elseif ( !in_array( $wiki, $this->wikis ) ) { throw new MWException( "No such wiki '$wiki'." ); } else { $this->cfgCache[$wiki] = []; } $result = Shell::makeScriptCommand( MW_INSTALL_PATH . '/maintenance/getConfiguration.php', [ '--wiki', $wiki, '--settings', implode( ' ', $settings ), '--format', 'PHP', ] ) // limit.sh breaks this call ->limits( [ 'memory' => 0, 'filesize' => 0 ] ) ->execute(); $data = trim( $result->getStdout() ); if ( $result->getExitCode() || $data === '' ) { throw new MWException( "Failed to run getConfiguration.php: {$result->getStdout()}" ); } $res = unserialize( $data ); if ( !is_array( $res ) ) { throw new MWException( "Failed to unserialize configuration array." ); } $this->cfgCache[$wiki] += $res; } return $multi ? $res : current( $res ); } /** * Merge multiple arrays together. * On encountering duplicate keys, merge the two, but ONLY if they're arrays. * PHP's array_merge_recursive() merges ANY duplicate values into arrays, * which is not fun * * @param array $array1 * @param array $array2 * @return array */ private static function arrayMerge( array $array1, array $array2 ) { $out = $array1; foreach ( $array2 as $key => $value ) { if ( isset( $out[$key] ) ) { if ( is_array( $out[$key] ) && is_array( $value ) ) { // Merge the new array into the existing one $out[$key] = self::arrayMerge( $out[$key], $value ); } elseif ( is_numeric( $key ) ) { // A numerical key is taken, append the value at the end instead. // It is important that we generally preserve numerical keys and only // fallback to appending values if there are conflicts. This is needed // by configuration variables that hold associative arrays with // meaningful numerical keys, such as $wgNamespacesWithSubpages, // $wgNamespaceProtection, $wgNamespacesToBeSearchedDefault, etc. $out[] = $value; } elseif ( $out[$key] === false ) { // A non-numerical key is taken and holds a false value, // allow it to be overridden always. This exists mainly for the purpose // merging permissions arrays, such as $wgGroupPermissions. $out[$key] = $value; } // Else: The key is already taken and we keep the current value } else { // Add a new key. $out[$key] = $value; } } return $out; } public function loadFullData() { if ( $this->fullLoadCallback && !$this->fullLoadDone ) { ( $this->fullLoadCallback )( $this ); $this->fullLoadDone = true; } } }
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