SiteConfiguration.php

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<?php
class SiteConfiguration {

    public $suffixes = array();

    public $wikis = array();

    public $settings = array();

    public $localVHosts = array();

    public $fullLoadCallback = null;

    public $fullLoadDone = false;

    public $siteParamsCallback = null;

    protected $cfgCache = array();

    public function get( $settingName, $wiki, $suffix = null, $params = array(), $wikiTags = array() ) {
        $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
        return $this->getSetting( $settingName, $wiki, $params );
    }

    protected function getSetting( $settingName, $wiki, /*array*/ $params ) {
        $retval = null;
        if ( array_key_exists( $settingName, $this->settings ) ) {
            $thisSetting =& $this->settings[$settingName];
            do {
                // Do individual wiki settings
                if ( array_key_exists( $wiki, $thisSetting ) ) {
                    $retval = $thisSetting[$wiki];
                    break;
                } elseif ( array_key_exists( "+$wiki", $thisSetting ) && is_array( $thisSetting["+$wiki"] ) ) {
                    $retval = $thisSetting["+$wiki"];
                }

                // Do tag settings
                foreach ( $params['tags'] as $tag ) {
                    if ( array_key_exists( $tag, $thisSetting ) ) {
                        if ( isset( $retval ) && is_array( $retval ) && is_array( $thisSetting[$tag] ) ) {
                            $retval = self::arrayMerge( $retval, $thisSetting[$tag] );
                        } else {
                            $retval = $thisSetting[$tag];
                        }
                        break 2;
                    } elseif ( array_key_exists( "+$tag", $thisSetting ) && is_array( $thisSetting["+$tag"] ) ) {
                        if ( !isset( $retval ) ) {
                            $retval = array();
                        }
                        $retval = self::arrayMerge( $retval, $thisSetting["+$tag"] );
                    }
                }
                // Do suffix settings
                $suffix = $params['suffix'];
                if ( !is_null( $suffix ) ) {
                    if ( array_key_exists( $suffix, $thisSetting ) ) {
                        if ( isset( $retval ) && is_array( $retval ) && is_array( $thisSetting[$suffix] ) ) {
                            $retval = self::arrayMerge( $retval, $thisSetting[$suffix] );
                        } else {
                            $retval = $thisSetting[$suffix];
                        }
                        break;
                    } elseif ( array_key_exists( "+$suffix", $thisSetting ) && is_array( $thisSetting["+$suffix"] ) ) {
                        if ( !isset( $retval ) ) {
                            $retval = array();
                        }
                        $retval = self::arrayMerge( $retval, $thisSetting["+$suffix"] );
                    }
                }

                // Fall back to default.
                if ( array_key_exists( 'default', $thisSetting ) ) {
                    if ( is_array( $retval ) && is_array( $thisSetting['default'] ) ) {
                        $retval = self::arrayMerge( $retval, $thisSetting['default'] );
                    } else {
                        $retval = $thisSetting['default'];
                    }
                    break;
                }
            } while ( false );
        }

        if ( !is_null( $retval ) && count( $params['params'] ) ) {
            foreach ( $params['params'] as $key => $value ) {
                $retval = $this->doReplace( '$' . $key, $value, $retval );
            }
        }
        return $retval;
    }

    function doReplace( $from, $to, $in ) {
        if ( is_string( $in ) ) {
            return str_replace( $from, $to, $in );
        } elseif ( is_array( $in ) ) {
            foreach ( $in as $key => $val ) {
                $in[$key] = $this->doReplace( $from, $to, $val );
            }
            return $in;
        } else {
            return $in;
        }
    }

    public function getAll( $wiki, $suffix = null, $params = array(), $wikiTags = array() ) {
        $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
        $localSettings = array();
        foreach ( $this->settings as $varname => $stuff ) {
            $append = false;
            $var = $varname;
            if ( substr( $varname, 0, 1 ) == '+' ) {
                $append = true;
                $var = substr( $varname, 1 );
            }

            $value = $this->getSetting( $varname, $wiki, $params );
            if ( $append && is_array( $value ) && is_array( $GLOBALS[$var] ) ) {
                $value = self::arrayMerge( $value, $GLOBALS[$var] );
            }
            if ( !is_null( $value ) ) {
                $localSettings[$var] = $value;
            }
        }
        return $localSettings;
    }

    public function getBool( $setting, $wiki, $suffix = null, $wikiTags = array() ) {
        return (bool)$this->get( $setting, $wiki, $suffix, array(), $wikiTags );
    }

    function &getLocalDatabases() {
        return $this->wikis;
    }

    public function extractVar( $setting, $wiki, $suffix, &$var, $params = array(), $wikiTags = array() ) {
        $value = $this->get( $setting, $wiki, $suffix, $params, $wikiTags );
        if ( !is_null( $value ) ) {
            $var = $value;
        }
    }

    public function extractGlobal( $setting, $wiki, $suffix = null, $params = array(), $wikiTags = array() ) {
        $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
        $this->extractGlobalSetting( $setting, $wiki, $params );
    }

    public function extractGlobalSetting( $setting, $wiki, $params ) {
        $value = $this->getSetting( $setting, $wiki, $params );
        if ( !is_null( $value ) ) {
            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;
            }
        }
    }

    public function extractAllGlobals( $wiki, $suffix = null, $params = array(), $wikiTags = array() ) {
        $params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
        foreach ( $this->settings as $varName => $setting ) {
            $this->extractGlobalSetting( $varName, $wiki, $params );
        }
    }

    protected function getWikiParams( $wiki ) {
        static $default = array(
            'suffix' => null,
            'lang' => null,
            'tags' => array(),
            'params' => array(),
        );

        if ( !is_callable( $this->siteParamsCallback ) ) {
            return $default;
        }

        $ret = call_user_func_array( $this->siteParamsCallback, array( $this, $wiki ) );
        # Validate the returned value
        if ( !is_array( $ret ) ) {
            return $default;
        }

        foreach ( $default as $name => $def ) {
            if ( !isset( $ret[$name] ) || ( is_array( $default[$name] ) && !is_array( $ret[$name] ) ) ) {
                $ret[$name] = $default[$name];
            }
        }

        return $ret;
    }

    protected function mergeParams( $wiki, $suffix, /*array*/ $params, /*array*/ $wikiTags ) {
        $ret = $this->getWikiParams( $wiki );

        if ( is_null( $ret['suffix'] ) ) {
            $ret['suffix'] = $suffix;
        }

        $ret['tags'] = array_unique( array_merge( $ret['tags'], $wikiTags ) );

        $ret['params'] += $params;

        // Automatically fill that ones if needed
        if ( !isset( $ret['params']['lang'] ) && !is_null( $ret['lang'] ) ) {
            $ret['params']['lang'] = $ret['lang'];
        }
        if ( !isset( $ret['params']['site'] ) && !is_null( $ret['suffix'] ) ) {
            $ret['params']['site'] = $ret['suffix'];
        }

        return $ret;
    }

    public function siteFromDB( $db ) {
        // Allow override
        $def = $this->getWikiParams( $db );
        if ( !is_null( $def['suffix'] ) && !is_null( $def['lang'] ) ) {
            return array( $def['suffix'], $def['lang'] );
        }

        $site = null;
        $lang = null;
        foreach ( $this->suffixes as $altSite => $suffix ) {
            if ( $suffix === '' ) {
                $site = '';
                $lang = $db;
                break;
            } elseif ( substr( $db, -strlen( $suffix ) ) == $suffix ) {
                $site = is_numeric( $altSite ) ? $suffix : $altSite;
                $lang = substr( $db, 0, strlen( $db ) - strlen( $suffix ) );
                break;
            }
        }
        $lang = str_replace( '_', '-', $lang );
        return array( $site, $lang );
    }

    public function getConfig( $wiki, $settings ) {
        global $IP;

        $multi = is_array( $settings );
        $settings = (array)$settings;
        if ( $wiki === wfWikiID() ) { // $wiki is this wiki
            $res = array();
            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_flip( $settings ) );
                if ( count( $res ) == count( $settings ) ) {
                    return $res; // cache hit
                }
            } elseif ( !in_array( $wiki, $this->wikis ) ) {
                throw new MWException( "No such wiki '$wiki'." );
            } else {
                $this->cfgCache[$wiki] = array();
            }
            $retVal = 1;
            $cmd = wfShellWikiCmd(
                "$IP/maintenance/getConfiguration.php",
                array(
                    '--wiki', $wiki,
                    '--settings', implode( ' ', $settings ),
                    '--format', 'PHP'
                )
            );
            // ulimit5.sh breaks this call
            $data = trim( wfShellExec( $cmd, $retVal, array(), array( 'memory' => 0 ) ) );
            if ( $retVal != 0 || !strlen( $data ) ) {
                throw new MWException( "Failed to run getConfiguration.php." );
            }
            $res = unserialize( $data );
            if ( !is_array( $res ) ) {
                throw new MWException( "Failed to unserialize configuration array." );
            }
            $this->cfgCache[$wiki] = $this->cfgCache[$wiki] + $res;
        }

        return $multi ? $res : current( $res );
    }

    public function isLocalVHost( $vhost ) {
        return in_array( $vhost, $this->localVHosts );
    }

    static function arrayMerge( $array1/* ... */ ) {
        $out = $array1;
        for ( $i = 1; $i < func_num_args(); $i++ ) {
            foreach ( func_get_arg( $i ) as $key => $value ) {
                if ( isset( $out[$key] ) && is_array( $out[$key] ) && is_array( $value ) ) {
                    $out[$key] = self::arrayMerge( $out[$key], $value );
                } elseif ( !isset( $out[$key] ) || !$out[$key] && !is_numeric( $key ) ) {
                    // Values that evaluate to true given precedence, for the primary purpose of merging permissions arrays.
                    $out[$key] = $value;
                } elseif ( is_numeric( $key ) ) {
                    $out[] = $value;
                }
            }
        }

        return $out;
    }

    public function loadFullData() {
        if ( $this->fullLoadCallback && !$this->fullLoadDone ) {
            call_user_func( $this->fullLoadCallback, $this );
            $this->fullLoadDone = true;
        }
    }
}