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[mediawiki.git] / includes / utils / AutoloadGenerator.php

<?php
/**
 * 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\Json\FormatJson;

/**
 * Accepts a list of files and directories to search for
 * php files and generates $wgAutoloadLocalClasses or $wgAutoloadClasses
 * lines for all detected classes. These lines are written out
 * to an autoload.php file in the projects provided basedir.
 *
 * Usage:
 *
 *     $gen = new AutoloadGenerator( __DIR__ );
 *     $gen->readDir( __DIR__ . '/includes' );
 *     $gen->readFile( __DIR__ . '/foo.php' )
 *     $gen->getAutoload();
 */
class AutoloadGenerator {
        private const FILETYPE_JSON = 'json';
        private const FILETYPE_PHP = 'php';

        /**
         * @var string Root path of the project being scanned for classes
         */
        protected $basepath;

        /**
         * @var ClassCollector Helper class extracts class names from php files
         */
        protected $collector;

        /**
         * @var array Map of file shortpath to list of FQCN detected within file
         */
        protected $classes = [];

        /**
         * @var string The global variable to write output to
         */
        protected $variableName = 'wgAutoloadClasses';

        /**
         * @var array Map of FQCN to relative path(from self::$basepath)
         */
        protected $overrides = [];

        /**
         * Directories that should be excluded
         *
         * @var string[]
         */
        protected $excludePaths = [];

        /**
         * Configured PSR4 namespaces
         *
         * @var string[] namespace => path
         */
        protected $psr4Namespaces = [];

        /**
         * @param string $basepath Root path of the project being scanned for classes
         * @param array|string $flags
         *
         *  local - If this flag is set $wgAutoloadLocalClasses will be build instead
         *          of $wgAutoloadClasses
         */
        public function __construct( $basepath, $flags = [] ) {
                if ( !is_array( $flags ) ) {
                        $flags = [ $flags ];
                }
                $this->basepath = self::normalizePathSeparator( realpath( $basepath ) );
                $this->collector = new ClassCollector;
                if ( in_array( 'local', $flags ) ) {
                        $this->variableName = 'wgAutoloadLocalClasses';
                }
        }

        /**
         * Directories that should be excluded
         *
         * @since 1.31
         * @param string[] $paths
         */
        public function setExcludePaths( array $paths ) {
                foreach ( $paths as $path ) {
                        $this->excludePaths[] = self::normalizePathSeparator( $path );
                }
        }

        /**
         * Unlike self::setExcludePaths(), this will only skip outputting the
         * autoloader entry when the namespace matches the path.
         *
         * @since 1.32
         * @deprecated since 1.40 - PSR-4 classes are now included in the generated classmap
         * @param string[] $namespaces Associative array mapping namespace to path
         */
        public function setPsr4Namespaces( array $namespaces ) {
                foreach ( $namespaces as $ns => $path ) {
                        $ns = rtrim( $ns, '\\' ) . '\\';
                        $this->psr4Namespaces[$ns] = rtrim( self::normalizePathSeparator( $path ), '/' );
                }
        }

        /**
         * Whether the file should be excluded
         *
         * @param string $path File path
         * @return bool
         */
        private function shouldExclude( $path ) {
                foreach ( $this->excludePaths as $dir ) {
                        if ( str_starts_with( $path, $dir ) ) {
                                return true;
                        }
                }

                return false;
        }

        /**
         * Force a class to be autoloaded from a specific path, regardless of where
         * or if it was detected.
         *
         * @param string $fqcn FQCN to force the location of
         * @param string $inputPath Full path to the file containing the class
         * @throws InvalidArgumentException
         */
        public function forceClassPath( $fqcn, $inputPath ) {
                $path = self::normalizePathSeparator( realpath( $inputPath ) );
                if ( !$path ) {
                        throw new InvalidArgumentException( "Invalid path: $inputPath" );
                }
                if ( !str_starts_with( $path, $this->basepath ) ) {
                        throw new InvalidArgumentException( "Path is not within basepath: $inputPath" );
                }
                $shortpath = substr( $path, strlen( $this->basepath ) );
                $this->overrides[$fqcn] = $shortpath;
        }

        /**
         * @param string $inputPath Path to a php file to find classes within
         * @throws InvalidArgumentException
         */
        public function readFile( $inputPath ) {
                // NOTE: do NOT expand $inputPath using realpath(). It is perfectly
                // reasonable for LocalSettings.php and similar files to be symlinks
                // to files that are outside of $this->basepath.
                $inputPath = self::normalizePathSeparator( $inputPath );
                $len = strlen( $this->basepath );
                if ( !str_starts_with( $inputPath, $this->basepath ) ) {
                        throw new InvalidArgumentException( "Path is not within basepath: $inputPath" );
                }
                if ( $this->shouldExclude( $inputPath ) ) {
                        return;
                }
                $fileContents = file_get_contents( $inputPath );

                // Skip files that declare themselves excluded
                if ( preg_match( '!^// *NO_AUTOLOAD!m', $fileContents ) ) {
                        return;
                }
                // Skip files that use CommandLineInc since these execute file-scope
                // code when included
                if ( preg_match(
                        '/(require|require_once)[ (].*(CommandLineInc.php|commandLine.inc)/',
                        $fileContents )
                ) {
                        return;
                }

                $result = $this->collector->getClasses( $fileContents );

                if ( $result ) {
                        $shortpath = substr( $inputPath, $len );
                        $this->classes[$shortpath] = $result;
                }
        }

        /**
         * @param string $dir Path to a directory to recursively search for php files
         */
        public function readDir( $dir ) {
                $it = new RecursiveDirectoryIterator(
                        self::normalizePathSeparator( realpath( $dir ) ) );
                $it = new RecursiveIteratorIterator( $it );

                foreach ( $it as $path => $file ) {
                        if ( pathinfo( $path, PATHINFO_EXTENSION ) === 'php' ) {
                                $this->readFile( $path );
                        }
                }
        }

        /**
         * Updates the AutoloadClasses field at the given
         * filename.
         *
         * @param string $filename Filename of JSON
         *  extension/skin registration file
         * @return string Updated Json of the file given as the $filename parameter
         */
        protected function generateJsonAutoload( $filename ) {
                $key = 'AutoloadClasses';
                $json = FormatJson::decode( file_get_contents( $filename ), true );
                unset( $json[$key] );
                // Inverting the key-value pairs so that they become of the
                // format class-name : path when they get converted into json.
                foreach ( $this->classes as $path => $contained ) {
                        foreach ( $contained as $fqcn ) {
                                // Using substr to remove the leading '/'
                                $json[$key][$fqcn] = substr( $path, 1 );
                        }
                }
                foreach ( $this->overrides as $path => $fqcn ) {
                        // Using substr to remove the leading '/'
                        $json[$key][$fqcn] = substr( $path, 1 );
                }

                // Sorting the list of autoload classes.
                ksort( $json[$key] );

                // Return the whole JSON file
                return FormatJson::encode( $json, "\t", FormatJson::ALL_OK ) . "\n";
        }

        /**
         * Generates a PHP file setting up autoload information.
         *
         * @param string $commandName Command name to include in comment
         * @param string $filename of PHP file to put autoload information in.
         * @return string
         */
        protected function generatePHPAutoload( $commandName, $filename ) {
                // No existing JSON file found; update/generate PHP file
                $content = [];

                // We need to generate a line each rather than exporting the
                // full array so __DIR__ can be prepended to all the paths
                $format = "%s => __DIR__ . %s,";
                foreach ( $this->classes as $path => $contained ) {
                        $exportedPath = var_export( $path, true );
                        foreach ( $contained as $fqcn ) {
                                $content[$fqcn] = sprintf(
                                        $format,
                                        var_export( $fqcn, true ),
                                        $exportedPath
                                );
                        }
                }

                foreach ( $this->overrides as $fqcn => $path ) {
                        $content[$fqcn] = sprintf(
                                $format,
                                var_export( $fqcn, true ),
                                var_export( $path, true )
                        );
                }

                // sort for stable output
                ksort( $content );

                // extensions using this generator are appending to the existing
                // autoload.
                if ( $this->variableName === 'wgAutoloadClasses' ) {
                        $op = '+=';
                } else {
                        $op = '=';
                }

                $output = implode( "\n\t", $content );
                return <<<EOD
<?php
// This file is generated by $commandName, do not adjust manually
// phpcs:disable Generic.Files.LineLength
global \${$this->variableName};

\${$this->variableName} {$op} [
        {$output}
];

EOD;
        }

        /**
         * Returns all known classes as a string, which can be used to put into a target
         * file (e.g. extension.json, skin.json or autoload.php)
         *
         * @param string $commandName Value used in file comment to direct
         *  developers towards the appropriate way to update the autoload.
         * @return string
         */
        public function getAutoload( $commandName = 'AutoloadGenerator' ) {
                // We need to check whether an extension.json or skin.json exists or not, and
                // incase it doesn't, update the autoload.php file.

                $fileinfo = $this->getTargetFileinfo();

                if ( $fileinfo['type'] === self::FILETYPE_JSON ) {
                        return $this->generateJsonAutoload( $fileinfo['filename'] );
                }

                return $this->generatePHPAutoload( $commandName, $fileinfo['filename'] );
        }

        /**
         * Returns the filename of the extension.json of skin.json, if there's any, or
         * otherwise the path to the autoload.php file in an array as the "filename"
         * key and with the type (AutoloadGenerator::FILETYPE_JSON or AutoloadGenerator::FILETYPE_PHP)
         * of the file as the "type" key.
         *
         * @return array
         */
        public function getTargetFileinfo() {
                if ( file_exists( $this->basepath . '/extension.json' ) ) {
                        return [
                                'filename' => $this->basepath . '/extension.json',
                                'type' => self::FILETYPE_JSON
                        ];
                }
                if ( file_exists( $this->basepath . '/skin.json' ) ) {
                        return [
                                'filename' => $this->basepath . '/skin.json',
                                'type' => self::FILETYPE_JSON
                        ];
                }

                return [
                        'filename' => $this->basepath . '/autoload.php',
                        'type' => self::FILETYPE_PHP
                ];
        }

        /**
         * Ensure that Unix-style path separators ("/") are used in the path.
         *
         * @param string $path
         * @return string
         */
        protected static function normalizePathSeparator( $path ) {
                return str_replace( '\\', '/', $path );
        }

        /**
         * Initialize the source files and directories which are used for the MediaWiki default
         * autoloader in {mw-base-dir}/autoload.php including:
         *  * includes/
         *  * languages/
         *  * maintenance/
         *  * mw-config/
         *  * any `*.php` file in the base directory
         */
        public function initMediaWikiDefault() {
                foreach ( [ 'includes', 'languages', 'maintenance', 'mw-config' ] as $dir ) {
                        $this->readDir( $this->basepath . '/' . $dir );
                }
                foreach ( glob( $this->basepath . '/*.php' ) as $file ) {
                        $this->readFile( $file );
                }
        }
}