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[mediawiki.git] / maintenance / generateSitemap.php

<?php
/**
 * Creates a sitemap for the site.
 *
 * Copyright © 2005, Ævar Arnfjörð Bjarmason, Jens Frank <jeluf@gmx.de> and
 * Brion Vibber <brion@pobox.com>
 *
 * 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
 * @ingroup Maintenance
 * @see http://www.sitemaps.org/
 * @see http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd
 */

require_once __DIR__ . '/Maintenance.php';

/**
 * Maintenance script that generates a sitemap for the site.
 *
 * @ingroup Maintenance
 */
class GenerateSitemap extends Maintenance {
        const GS_MAIN = -2;
        const GS_TALK = -1;

        /**
         * The maximum amount of urls in a sitemap file
         *
         * @link http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd
         *
         * @var int
         */
        public $url_limit;

        /**
         * The maximum size of a sitemap file
         *
         * @link http://www.sitemaps.org/faq.php#faq_sitemap_size
         *
         * @var int
         */
        public $size_limit;

        /**
         * The path to prepend to the filename
         *
         * @var string
         */
        public $fspath;

        /**
         * The URL path to prepend to filenames in the index;
         * should resolve to the same directory as $fspath.
         *
         * @var string
         */
        public $urlpath;

        /**
         * Whether or not to use compression
         *
         * @var bool
         */
        public $compress;

        /**
         * Whether or not to include redirection pages
         *
         * @var bool
         */
        public $skipRedirects;

        /**
         * The number of entries to save in each sitemap file
         *
         * @var array
         */
        public $limit = array();

        /**
         * Key => value entries of namespaces and their priorities
         *
         * @var array
         */
        public $priorities = array();

        /**
         * A one-dimensional array of namespaces in the wiki
         *
         * @var array
         */
        public $namespaces = array();

        /**
         * When this sitemap batch was generated
         *
         * @var string
         */
        public $timestamp;

        /**
         * A database slave object
         *
         * @var object
         */
        public $dbr;

        /**
         * A resource pointing to the sitemap index file
         *
         * @var resource
         */
        public $findex;

        /**
         * A resource pointing to a sitemap file
         *
         * @var resource
         */
        public $file;

        /**
         * Identifier to use in filenames, default $wgDBname
         *
         * @var string
         */
        private $identifier;

        /**
         * Constructor
         */
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Creates a sitemap for the site";
                $this->addOption(
                        'fspath',
                        'The file system path to save to, e.g. /tmp/sitemap; defaults to current directory',
                        false,
                        true
                );
                $this->addOption(
                        'urlpath',
                        'The URL path corresponding to --fspath, prepended to filenames in the index; '
                                . 'defaults to an empty string',
                        false,
                        true
                );
                $this->addOption(
                        'compress',
                        'Compress the sitemap files, can take value yes|no, default yes',
                        false,
                        true
                );
                $this->addOption( 'skip-redirects', 'Do not include redirecting articles in the sitemap' );
                $this->addOption(
                        'identifier',
                        'What site identifier to use for the wiki, defaults to $wgDBname',
                        false,
                        true
                );
        }

        /**
         * Execute
         */
        public function execute() {
                $this->setNamespacePriorities();
                $this->url_limit = 50000;
                $this->size_limit = pow( 2, 20 ) * 10;
                $this->fspath = self::init_path( $this->getOption( 'fspath', getcwd() ) );
                $this->urlpath = $this->getOption( 'urlpath', "" );
                if ( $this->urlpath !== "" && substr( $this->urlpath, -1 ) !== '/' ) {
                        $this->urlpath .= '/';
                }
                $this->identifier = $this->getOption( 'identifier', wfWikiID() );
                $this->compress = $this->getOption( 'compress', 'yes' ) !== 'no';
                $this->skipRedirects = $this->getOption( 'skip-redirects', false ) !== false;
                $this->dbr = wfGetDB( DB_SLAVE );
                $this->generateNamespaces();
                $this->timestamp = wfTimestamp( TS_ISO_8601, wfTimestampNow() );
                $this->findex = fopen( "{$this->fspath}sitemap-index-{$this->identifier}.xml", 'wb' );
                $this->main();
        }

        private function setNamespacePriorities() {
                global $wgSitemapNamespacesPriorities;

                // Custom main namespaces
                $this->priorities[self::GS_MAIN] = '0.5';
                // Custom talk namesspaces
                $this->priorities[self::GS_TALK] = '0.1';
                // MediaWiki standard namespaces
                $this->priorities[NS_MAIN] = '1.0';
                $this->priorities[NS_TALK] = '0.1';
                $this->priorities[NS_USER] = '0.5';
                $this->priorities[NS_USER_TALK] = '0.1';
                $this->priorities[NS_PROJECT] = '0.5';
                $this->priorities[NS_PROJECT_TALK] = '0.1';
                $this->priorities[NS_FILE] = '0.5';
                $this->priorities[NS_FILE_TALK] = '0.1';
                $this->priorities[NS_MEDIAWIKI] = '0.0';
                $this->priorities[NS_MEDIAWIKI_TALK] = '0.1';
                $this->priorities[NS_TEMPLATE] = '0.0';
                $this->priorities[NS_TEMPLATE_TALK] = '0.1';
                $this->priorities[NS_HELP] = '0.5';
                $this->priorities[NS_HELP_TALK] = '0.1';
                $this->priorities[NS_CATEGORY] = '0.5';
                $this->priorities[NS_CATEGORY_TALK] = '0.1';

                // Custom priorities
                if ( $wgSitemapNamespacesPriorities !== false ) {
                        /**
                         * @var $wgSitemapNamespacesPriorities array
                         */
                        foreach ( $wgSitemapNamespacesPriorities as $namespace => $priority ) {
                                $float = floatval( $priority );
                                if ( $float > 1.0 ) {
                                        $priority = '1.0';
                                } elseif ( $float < 0.0 ) {
                                        $priority = '0.0';
                                }
                                $this->priorities[$namespace] = $priority;
                        }
                }
        }

        /**
         * Create directory if it does not exist and return pathname with a trailing slash
         * @param string $fspath
         * @return null|string
         */
        private static function init_path( $fspath ) {
                # Create directory if needed
                if ( $fspath && !is_dir( $fspath ) ) {
                        wfMkdirParents( $fspath, null, __METHOD__ ) or die( "Can not create directory $fspath.\n" );
                }

                return realpath( $fspath ) . DIRECTORY_SEPARATOR;
        }

        /**
         * Generate a one-dimensional array of existing namespaces
         */
        function generateNamespaces() {
                // Only generate for specific namespaces if $wgSitemapNamespaces is an array.
                global $wgSitemapNamespaces;
                if ( is_array( $wgSitemapNamespaces ) ) {
                        $this->namespaces = $wgSitemapNamespaces;

                        return;
                }

                $res = $this->dbr->select( 'page',
                        array( 'page_namespace' ),
                        array(),
                        __METHOD__,
                        array(
                                'GROUP BY' => 'page_namespace',
                                'ORDER BY' => 'page_namespace',
                        )
                );

                foreach ( $res as $row ) {
                        $this->namespaces[] = $row->page_namespace;
                }
        }

        /**
         * Get the priority of a given namespace
         *
         * @param int $namespace The namespace to get the priority for
         * @return string
         */
        function priority( $namespace ) {
                return isset( $this->priorities[$namespace] )
                        ? $this->priorities[$namespace]
                        : $this->guessPriority( $namespace );
        }

        /**
         * If the namespace isn't listed on the priority list return the
         * default priority for the namespace, varies depending on whether it's
         * a talkpage or not.
         *
         * @param int $namespace The namespace to get the priority for
         * @return string
         */
        function guessPriority( $namespace ) {
                return MWNamespace::isSubject( $namespace )
                        ? $this->priorities[self::GS_MAIN]
                        : $this->priorities[self::GS_TALK];
        }

        /**
         * Return a database resolution of all the pages in a given namespace
         *
         * @param int $namespace Limit the query to this namespace
         * @return Resource
         */
        function getPageRes( $namespace ) {
                return $this->dbr->select( 'page',
                        array(
                                'page_namespace',
                                'page_title',
                                'page_touched',
                                'page_is_redirect'
                        ),
                        array( 'page_namespace' => $namespace ),
                        __METHOD__
                );
        }

        /**
         * Main loop
         */
        public function main() {
                global $wgContLang;

                fwrite( $this->findex, $this->openIndex() );

                foreach ( $this->namespaces as $namespace ) {
                        $res = $this->getPageRes( $namespace );
                        $this->file = false;
                        $this->generateLimit( $namespace );
                        $length = $this->limit[0];
                        $i = $smcount = 0;

                        $fns = $wgContLang->getFormattedNsText( $namespace );
                        $this->output( "$namespace ($fns)\n" );
                        $skippedRedirects = 0; // Number of redirects skipped for that namespace
                        foreach ( $res as $row ) {
                                if ( $this->skipRedirects && $row->page_is_redirect ) {
                                        $skippedRedirects++;
                                        continue;
                                }

                                if ( $i++ === 0
                                        || $i === $this->url_limit + 1
                                        || $length + $this->limit[1] + $this->limit[2] > $this->size_limit
                                ) {
                                        if ( $this->file !== false ) {
                                                $this->write( $this->file, $this->closeFile() );
                                                $this->close( $this->file );
                                        }
                                        $filename = $this->sitemapFilename( $namespace, $smcount++ );
                                        $this->file = $this->open( $this->fspath . $filename, 'wb' );
                                        $this->write( $this->file, $this->openFile() );
                                        fwrite( $this->findex, $this->indexEntry( $filename ) );
                                        $this->output( "\t$this->fspath$filename\n" );
                                        $length = $this->limit[0];
                                        $i = 1;
                                }
                                $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                                $date = wfTimestamp( TS_ISO_8601, $row->page_touched );
                                $entry = $this->fileEntry( $title->getCanonicalURL(), $date, $this->priority( $namespace ) );
                                $length += strlen( $entry );
                                $this->write( $this->file, $entry );
                                // generate pages for language variants
                                if ( $wgContLang->hasVariants() ) {
                                        $variants = $wgContLang->getVariants();
                                        foreach ( $variants as $vCode ) {
                                                if ( $vCode == $wgContLang->getCode() ) {
                                                        continue; // we don't want default variant
                                                }
                                                $entry = $this->fileEntry(
                                                        $title->getCanonicalURL( '', $vCode ),
                                                        $date,
                                                        $this->priority( $namespace )
                                                );
                                                $length += strlen( $entry );
                                                $this->write( $this->file, $entry );
                                        }
                                }
                        }

                        if ( $this->skipRedirects && $skippedRedirects > 0 ) {
                                $this->output( "  skipped $skippedRedirects redirect(s)\n" );
                        }

                        if ( $this->file ) {
                                $this->write( $this->file, $this->closeFile() );
                                $this->close( $this->file );
                        }
                }
                fwrite( $this->findex, $this->closeIndex() );
                fclose( $this->findex );
        }

        /**
         * gzopen() / fopen() wrapper
         *
         * @param string $file
         * @param string $flags
         * @return resource
         */
        function open( $file, $flags ) {
                $resource = $this->compress ? gzopen( $file, $flags ) : fopen( $file, $flags );
                if ( $resource === false ) {
                        throw new MWException( __METHOD__
                                . " error opening file $file with flags $flags. Check permissions?" );
                }

                return $resource;
        }

        /**
         * gzwrite() / fwrite() wrapper
         *
         * @param resource $handle
         * @param string $str
         */
        function write( &$handle, $str ) {
                if ( $handle === true || $handle === false ) {
                        throw new MWException( __METHOD__ . " was passed a boolean as a file handle.\n" );
                }
                if ( $this->compress ) {
                        gzwrite( $handle, $str );
                } else {
                        fwrite( $handle, $str );
                }
        }

        /**
         * gzclose() / fclose() wrapper
         *
         * @param resource $handle
         */
        function close( &$handle ) {
                if ( $this->compress ) {
                        gzclose( $handle );
                } else {
                        fclose( $handle );
                }
        }

        /**
         * Get a sitemap filename
         *
         * @param int $namespace The namespace
         * @param int $count The count
         * @return string
         */
        function sitemapFilename( $namespace, $count ) {
                $ext = $this->compress ? '.gz' : '';

                return "sitemap-{$this->identifier}-NS_$namespace-$count.xml$ext";
        }

        /**
         * Return the XML required to open an XML file
         *
         * @return string
         */
        function xmlHead() {
                return '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
        }

        /**
         * Return the XML schema being used
         *
         * @return string
         */
        function xmlSchema() {
                return 'http://www.sitemaps.org/schemas/sitemap/0.9';
        }

        /**
         * Return the XML required to open a sitemap index file
         *
         * @return string
         */
        function openIndex() {
                return $this->xmlHead() . '<sitemapindex xmlns="' . $this->xmlSchema() . '">' . "\n";
        }

        /**
         * Return the XML for a single sitemap indexfile entry
         *
         * @param string $filename The filename of the sitemap file
         * @return string
         */
        function indexEntry( $filename ) {
                return
                        "\t<sitemap>\n" .
                        "\t\t<loc>{$this->urlpath}$filename</loc>\n" .
                        "\t\t<lastmod>{$this->timestamp}</lastmod>\n" .
                        "\t</sitemap>\n";
        }

        /**
         * Return the XML required to close a sitemap index file
         *
         * @return string
         */
        function closeIndex() {
                return "</sitemapindex>\n";
        }

        /**
         * Return the XML required to open a sitemap file
         *
         * @return string
         */
        function openFile() {
                return $this->xmlHead() . '<urlset xmlns="' . $this->xmlSchema() . '">' . "\n";
        }

        /**
         * Return the XML for a single sitemap entry
         *
         * @param string $url An RFC 2396 compliant URL
         * @param string $date A ISO 8601 date
         * @param string $priority A priority indicator, 0.0 - 1.0 inclusive with a 0.1 stepsize
         * @return string
         */
        function fileEntry( $url, $date, $priority ) {
                return
                        "\t<url>\n" .
                        // bug 34666: $url may contain bad characters such as ampersands.
                        "\t\t<loc>" . htmlspecialchars( $url ) . "</loc>\n" .
                        "\t\t<lastmod>$date</lastmod>\n" .
                        "\t\t<priority>$priority</priority>\n" .
                        "\t</url>\n";
        }

        /**
         * Return the XML required to close sitemap file
         *
         * @return string
         */
        function closeFile() {
                return "</urlset>\n";
        }

        /**
         * Populate $this->limit
         *
         * @param int $namespace
         */
        function generateLimit( $namespace ) {
                // bug 17961: make a title with the longest possible URL in this namespace
                $title = Title::makeTitle( $namespace, str_repeat( "\xf0\xa8\xae\x81", 63 ) . "\xe5\x96\x83" );

                $this->limit = array(
                        strlen( $this->openFile() ),
                        strlen( $this->fileEntry(
                                $title->getCanonicalURL(),
                                wfTimestamp( TS_ISO_8601, wfTimestamp() ),
                                $this->priority( $namespace )
                        ) ),
                        strlen( $this->closeFile() )
                );
        }
}

$maintClass = "GenerateSitemap";
require_once RUN_MAINTENANCE_IF_MAIN;