convertExtensionToRegistration.php

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<?php
 
use MediaWiki\Json\FormatJson;
use MediaWiki\Maintenance\Maintenance;
use MediaWiki\Registration\ExtensionProcessor;
use MediaWiki\Registration\ExtensionRegistry;
use Wikimedia\Composer\ComposerJson;
 
// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd
 
class ConvertExtensionToRegistration extends Maintenance {
 
    private const CUSTOM_GLOBALS = [
        'MessagesDirs' => 'handleMessagesDirs',
        'ExtensionMessagesFiles' => 'handleExtensionMessagesFiles',
        'AutoloadClasses' => 'removeAbsolutePath',
        'ExtensionCredits' => 'handleCredits',
        'ResourceModules' => 'handleResourceModules',
        'ResourceModuleSkinStyles' => 'handleResourceModules',
        'Hooks' => 'handleHooks',
        'ExtensionFunctions' => 'handleExtensionFunctions',
        'ParserTestFiles' => 'removeAutodiscoveredParserTestFiles',
    ];
 
    private const FORMER_GLOBALS = [
        'TrackingCategories',
    ];
 
    private const NO_LONGER_SUPPORTED_GLOBALS = [
        'SpecialPageGroups' => 'deprecated', // Deprecated 1.21, removed in 1.26
    ];
 
    private const PROMOTE_ATTRIBUTES = [
        'name',
        'namemsg',
        'version',
        'author',
        'url',
        'description',
        'descriptionmsg',
        'license-name',
        'type',
    ];
 
    private array $json;
    private string $dir;
    private bool $hasWarning = false;
 
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Converts extension entry points to the new JSON registration format' );
        $this->addArg( 'path', 'Location to the PHP entry point you wish to convert',
            /* $required = */ true );
        $this->addOption( 'skin', 'Whether to write to skin.json', false, false );
        $this->addOption( 'config-prefix', 'Custom prefix for configuration settings', false, true );
    }
 
    protected function getAllGlobals(): array {
        $processor = new ReflectionClass( ExtensionProcessor::class );
        $settings = $processor->getProperty( 'globalSettings' );
        $settings->setAccessible( true );
        return array_merge( $settings->getValue(), self::FORMER_GLOBALS );
    }
 
    public function execute() {
        // Extensions will do stuff like $wgResourceModules += array(...) which is a
        // fatal unless an array is already set. So set an empty value.
        // And use the weird $__settings name to avoid any conflicts
        // with real poorly named settings.
        $__settings = array_merge( $this->getAllGlobals(), array_keys( self::CUSTOM_GLOBALS ) );
        foreach ( $__settings as $var ) {
            $var = 'wg' . $var;
            $$var = [];
        }
        unset( $var );
        $arg = $this->getArg( 0 );
        if ( !is_file( $arg ) ) {
            $this->fatalError( "$arg is not a file." );
        }
        require $arg;
        unset( $arg );
        // Try not to create any local variables before this line
        $vars = get_defined_vars();
        unset( $vars['this'] );
        unset( $vars['__settings'] );
        $this->dir = dirname( realpath( $this->getArg( 0 ) ) );
        $this->json = [];
        $globalSettings = $this->getAllGlobals();
        $configPrefix = $this->getOption( 'config-prefix', 'wg' );
        if ( $configPrefix !== 'wg' ) {
            $this->json['config']['_prefix'] = $configPrefix;
        }
 
        foreach ( $vars as $name => $value ) {
            $realName = substr( $name, 2 ); // Strip 'wg'
            if ( $realName === false ) {
                continue;
            }
 
            // If it's an empty array that we likely set, skip it
            if ( is_array( $value ) && count( $value ) === 0 && in_array( $realName, $__settings ) ) {
                continue;
            }
 
            if ( isset( self::CUSTOM_GLOBALS[$realName] ) ) {
                $method = self::CUSTOM_GLOBALS[$realName];
                $this->$method( $realName, $value, $vars );
            } elseif ( in_array( $realName, $globalSettings ) ) {
                $this->json[$realName] = $value;
            } elseif ( array_key_exists( $realName, self::NO_LONGER_SUPPORTED_GLOBALS ) ) {
                $this->output( 'Warning: Skipped global "' . $name . '" (' .
                    self::NO_LONGER_SUPPORTED_GLOBALS[$realName] . '). ' .
                    "Please update the entry point before convert to registration.\n" );
                $this->hasWarning = true;
            } elseif ( strpos( $name, $configPrefix ) === 0 ) {
                $configName = substr( $name, strlen( $configPrefix ) );
 
                $isPath = false;
                if ( is_array( $value ) ) {
                    foreach ( $value as $k => $v ) {
                        if ( strpos( $v, $this->dir ) !== false ) {
                            $value[$k] = $this->stripPath( $v, $this->dir );
                            $isPath = true;
                        }
                    }
                } elseif ( is_string( $value ) && strpos( $value, $this->dir ) !== false ) {
                    $value = $this->stripPath( $value, $this->dir );
                    $isPath = true;
                }
 
                // Most likely a config setting
                $this->json['config'][$configName] = [ 'value' => $value ];
 
                if ( $isPath ) {
                    $this->json['config'][$configName]['path'] = true;
                }
            } elseif ( $configPrefix !== 'wg' && strpos( $name, 'wg' ) === 0 ) {
                // Warn about this
                $this->output( 'Warning: Skipped global "' . $name . '" (' .
                    'config prefix is "' . $configPrefix . '"). ' .
                    "Please check that this setting isn't needed.\n" );
            }
        }
 
        // check, if the extension requires composer libraries
        if ( $this->needsComposerAutoloader( dirname( $this->getArg( 0 ) ) ) ) {
            // set the load composer autoloader automatically property
            $this->output( "Detected composer dependencies, setting 'load_composer_autoloader' to true.\n" );
            $this->json['load_composer_autoloader'] = true;
        }
 
        // Move some keys to the top
        $out = [];
        foreach ( self::PROMOTE_ATTRIBUTES as $key ) {
            if ( isset( $this->json[$key] ) ) {
                $out[$key] = $this->json[$key];
                unset( $this->json[$key] );
            }
        }
        // Set a requirement on the MediaWiki version that the current MANIFEST_VERSION
        // was introduced in.
        $out['requires'] = [
            ExtensionRegistry::MEDIAWIKI_CORE => ExtensionRegistry::MANIFEST_VERSION_MW_VERSION
        ];
        $out += $this->json;
        // Put this at the bottom
        $out['manifest_version'] = ExtensionRegistry::MANIFEST_VERSION;
        $type = $this->hasOption( 'skin' ) ? 'skin' : 'extension';
        $fname = "{$this->dir}/$type.json";
        $prettyJSON = FormatJson::encode( $out, "\t", FormatJson::ALL_OK );
        file_put_contents( $fname, $prettyJSON . "\n" );
        $this->output( "Wrote output to $fname.\n" );
        if ( $this->hasWarning ) {
            $this->output( "Found warnings! Please resolve the warnings and rerun this script.\n" );
        }
    }
 
    protected function handleExtensionFunctions( string $realName, array $value ) {
        foreach ( $value as $func ) {
            if ( $func instanceof Closure ) {
                $this->fatalError( "Error: Closures cannot be converted to JSON. " .
                    "Please move your extension function somewhere else."
                );
            } elseif ( function_exists( $func ) ) {
                // check if $func exists in the global scope
                $this->fatalError( "Error: Global functions cannot be converted to JSON. " .
                    "Please move your extension function ($func) into a class."
                );
            }
        }
 
        $this->json[$realName] = $value;
    }
 
    protected function handleMessagesDirs( string $realName, array $value, array $_ ) {
        foreach ( $value as $key => $dirs ) {
            foreach ( (array)$dirs as $dir ) {
                $this->json[$realName][$key][] = $this->stripPath( $dir, $this->dir );
            }
        }
    }
 
    protected function handleExtensionMessagesFiles( string $realName, array $value, array $vars ) {
        foreach ( $value as $key => $file ) {
            $strippedFile = $this->stripPath( $file, $this->dir );
            if ( isset( $vars['wgMessagesDirs'][$key] ) ) {
                $this->output(
                    "Note: Ignoring PHP shim $strippedFile. " .
                    "If your extension no longer supports versions of MediaWiki " .
                    "older than 1.23.0, you can safely delete it.\n"
                );
            } else {
                $this->json[$realName][$key] = $strippedFile;
            }
        }
    }
 
    private function stripPath( string $val, string $dir ): string {
        if ( $val === $dir ) {
            $val = '';
        } elseif ( strpos( $val, $dir ) === 0 ) {
            // +1 is for the trailing / that won't be in $this->dir
            $val = substr( $val, strlen( $dir ) + 1 );
        }
 
        return $val;
    }
 
    protected function removeAbsolutePath( string $realName, array $value ) {
        $out = [];
        foreach ( $value as $key => $val ) {
            $out[$key] = $this->stripPath( $val, $this->dir );
        }
        $this->json[$realName] = $out;
    }
 
    protected function removeAutodiscoveredParserTestFiles( string $realName, array $value ) {
        $out = [];
        foreach ( $value as $key => $val ) {
            $path = $this->stripPath( $val, $this->dir );
            // When path starts with tests/parser/ the file would be autodiscovered with
            // extension registry, so no need to add it to extension.json
            if ( !str_starts_with( $path, 'tests/parser/' ) || !str_ends_with( $path, '.txt' ) ) {
                $out[$key] = $path;
            }
        }
        // in the best case all entries are filtered out
        if ( $out ) {
            $this->json[$realName] = $out;
        }
        // FIXME: the ParserTestFiles key was deprecated in
        // MW 1.30 and removed in MW 1.40.  If not all entries were filtered
        // out by the above, we *should* recommend the user move the
        // parser tests under `tests/parser` *not* generate an extension.json
        // with a ParserTestFiles key that will no longer validate.
    }
 
    protected function handleCredits( string $realName, array $value ) {
        $keys = array_keys( $value );
        $this->json['type'] = $keys[0];
        $values = array_values( $value );
        foreach ( $values[0][0] as $name => $val ) {
            if ( $name !== 'path' ) {
                $this->json[$name] = $val;
            }
        }
    }
 
    public function handleHooks( string $realName, array $value ) {
        foreach ( $value as $hookName => &$handlers ) {
            if ( $hookName === 'UnitTestsList' ) {
                $this->output( "Note: the UnitTestsList hook is no longer necessary as " .
                    "long as your tests are located in the \"tests/phpunit/\" directory. " .
                    "Please see <https://www.mediawiki.org/wiki/Manual:PHP_unit_testing/" .
                    "Writing_unit_tests_for_extensions#Register_your_tests> for more details.\n"
                );
            }
            foreach ( $handlers as $func ) {
                if ( $func instanceof Closure ) {
                    $this->fatalError( "Error: Closures cannot be converted to JSON. " .
                        "Please move the handler for $hookName somewhere else."
                    );
                } elseif ( function_exists( $func ) ) {
                    // Check if $func exists in the global scope
                    $this->fatalError( "Error: Global functions cannot be converted to JSON. " .
                        "Please move the handler for $hookName inside a class."
                    );
                }
            }
            if ( count( $handlers ) === 1 ) {
                $handlers = $handlers[0];
            }
        }
        $this->json[$realName] = $value;
    }
 
    protected function handleResourceModules( $realName, $value ) {
        $defaults = [];
        $remote = $this->hasOption( 'skin' ) ? 'remoteSkinPath' : 'remoteExtPath';
        foreach ( $value as $name => $data ) {
            if ( isset( $data['localBasePath'] ) ) {
                $data['localBasePath'] = $this->stripPath( $data['localBasePath'], $this->dir );
                if ( !$defaults ) {
                    $defaults['localBasePath'] = $data['localBasePath'];
                    unset( $data['localBasePath'] );
                    if ( isset( $data[$remote] ) ) {
                        $defaults[$remote] = $data[$remote];
                        unset( $data[$remote] );
                    }
                } else {
                    if ( $data['localBasePath'] === $defaults['localBasePath'] ) {
                        unset( $data['localBasePath'] );
                    }
                    if ( isset( $data[$remote] ) && isset( $defaults[$remote] )
                        && $data[$remote] === $defaults[$remote]
                    ) {
                        unset( $data[$remote] );
                    }
                }
            }
 
            $this->json[$realName][$name] = $data;
        }
        if ( $defaults ) {
            $this->json['ResourceFileModulePaths'] = $defaults;
        }
    }
 
    protected function needsComposerAutoloader( string $path ): bool {
        $path .= '/composer.json';
        if ( file_exists( $path ) ) {
            // assume that the composer.json file is in the root of the extension path
            $composerJson = new ComposerJson( $path );
            // check if there are some dependencies in the require section
            if ( $composerJson->getRequiredDependencies() ) {
                return true;
            }
        }
        return false;
    }
}
 
// @codeCoverageIgnoreStart
$maintClass = ConvertExtensionToRegistration::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd