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Edit File: Installer.php

<?php

declare(strict_types=1);

namespace PackageVersions;

use Composer\Composer;
use Composer\Config;
use Composer\EventDispatcher\EventSubscriberInterface;
use Composer\IO\IOInterface;
use Composer\Package\AliasPackage;
use Composer\Package\Locker;
use Composer\Package\PackageInterface;
use Composer\Package\RootPackageInterface;
use Composer\Plugin\PluginInterface;
use Composer\Script\Event;
use Composer\Script\ScriptEvents;
use Generator;
use RuntimeException;

use function array_key_exists;
use function array_merge;
use function chmod;
use function dirname;
use function file_exists;
use function file_put_contents;
use function is_writable;
use function iterator_to_array;
use function rename;
use function sprintf;
use function uniqid;
use function var_export;

final class Installer implements PluginInterface, EventSubscriberInterface
{
    private static $generatedClassTemplate = <<<'PHP'
<?php

declare(strict_types=1);

namespace PackageVersions;

use Composer\InstalledVersions;
use OutOfBoundsException;

class_exists(InstalledVersions::class);

/**
 * This class is generated by composer/package-versions-deprecated, specifically by
 * @see \PackageVersions\Installer
 *
 * This file is overwritten at every run of `composer install` or `composer update`.
 *
 * @deprecated in favor of the Composer\InstalledVersions class provided by Composer 2. Require composer-runtime-api:^2 to ensure it is present.
 */
%s
{
    /**
     * @deprecated please use {@see self::rootPackageName()} instead.
     *             This constant will be removed in version 2.0.0.
     */
    const ROOT_PACKAGE_NAME = '%s';

/**
     * Array of all available composer packages.
     * Dont read this array from your calling code, but use the \PackageVersions\Versions::getVersion() method instead.
     *
     * @var array<string, string>
     * @internal
     */
    const VERSIONS          = %s;

private function __construct()
    {
    }

/**
     * @psalm-pure
     *
     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
     *                                  cause any side effects here.
     */
    public static function rootPackageName() : string
    {
        if (!self::composer2ApiUsable()) {
            return self::ROOT_PACKAGE_NAME;
        }

return InstalledVersions::getRootPackage()['name'];
    }

/**
     * @throws OutOfBoundsException If a version cannot be located.
     *
     * @psalm-param key-of<self::VERSIONS> $packageName
     * @psalm-pure
     *
     * @psalm-suppress ImpureMethodCall we know that {@see InstalledVersions} interaction does not
     *                                  cause any side effects here.
     */
    public static function getVersion(string $packageName): string
    {
        if (self::composer2ApiUsable()) {
            return InstalledVersions::getPrettyVersion($packageName)
                . '@' . InstalledVersions::getReference($packageName);
        }

if (isset(self::VERSIONS[$packageName])) {
            return self::VERSIONS[$packageName];
        }

throw new OutOfBoundsException(
            'Required package "' . $packageName . '" is not installed: check your ./vendor/composer/installed.json and/or ./composer.lock files'
        );
    }

private static function composer2ApiUsable(): bool
    {
        if (!class_exists(InstalledVersions::class, false)) {
            return false;
        }

if (method_exists(InstalledVersions::class, 'getAllRawData')) {
            $rawData = InstalledVersions::getAllRawData();
            if (count($rawData) === 1 && count($rawData[0]) === 0) {
                return false;
            }
        } else {
            $rawData = InstalledVersions::getRawData();
            if ($rawData === null || $rawData === []) {
                return false;
            }
        }

return true;
    }
}

PHP;

public function activate(Composer $composer, IOInterface $io)
    {
        // Nothing to do here, as all features are provided through event listeners
    }

public function deactivate(Composer $composer, IOInterface $io)
    {
        // Nothing to do here, as all features are provided through event listeners
    }

public function uninstall(Composer $composer, IOInterface $io)
    {
        // Nothing to do here, as all features are provided through event listeners
    }

/**
     * {@inheritDoc}
     */
    public static function getSubscribedEvents(): array
    {
        return [ScriptEvents::POST_AUTOLOAD_DUMP => 'dumpVersionsClass'];
    }

/**
     * @throws RuntimeException
     */
    public static function dumpVersionsClass(Event $composerEvent)
    {
        $composer    = $composerEvent->getComposer();
        $rootPackage = $composer->getPackage();
        $versions    = iterator_to_array(self::getVersions($composer->getLocker(), $rootPackage));

if (! array_key_exists('composer/package-versions-deprecated', $versions)) {
            //plugin must be globally installed - we only want to generate versions for projects which specifically
            //require composer/package-versions-deprecated
            return;
        }

$versionClass = self::generateVersionsClass($rootPackage->getName(), $versions);

self::writeVersionClassToFile($versionClass, $composer, $composerEvent->getIO());
    }

/**
     * @param string[] $versions
     */
    private static function generateVersionsClass(string $rootPackageName, array $versions): string
    {
        return sprintf(
            self::$generatedClassTemplate,
            'fin' . 'al ' . 'cla' . 'ss ' . 'Versions', // note: workaround for regex-based code parsers :-(
            $rootPackageName,
            var_export($versions, true)
        );
    }

/**
     * @throws RuntimeException
     */
    private static function writeVersionClassToFile(string $versionClassSource, Composer $composer, IOInterface $io)
    {
        $installPath = self::locateRootPackageInstallPath($composer->getConfig(), $composer->getPackage())
            . '/src/PackageVersions/Versions.php';

$installDir = dirname($installPath);
        if (! file_exists($installDir)) {
            $io->write('<info>composer/package-versions-deprecated:</info> Package not found (probably scheduled for removal); generation of version class skipped.');

return;
        }

if (! is_writable($installDir)) {
            $io->write(
                sprintf(
                    '<info>composer/package-versions-deprecated:</info> %s is not writable; generation of version class skipped.',
                    $installDir
                )
            );

return;
        }

$io->write('<info>composer/package-versions-deprecated:</info> Generating version class...');

$installPathTmp = $installPath . '_' . uniqid('tmp', true);
        file_put_contents($installPathTmp, $versionClassSource);
        chmod($installPathTmp, 0664);
        rename($installPathTmp, $installPath);

$io->write('<info>composer/package-versions-deprecated:</info> ...done generating version class');
    }

/**
     * @throws RuntimeException
     */
    private static function locateRootPackageInstallPath(
        Config $composerConfig,
        RootPackageInterface $rootPackage
    ): string {
        if (self::getRootPackageAlias($rootPackage)->getName() === 'composer/package-versions-deprecated') {
            return dirname($composerConfig->get('vendor-dir'));
        }

return $composerConfig->get('vendor-dir') . '/composer/package-versions-deprecated';
    }

private static function getRootPackageAlias(RootPackageInterface $rootPackage): PackageInterface
    {
        $package = $rootPackage;

while ($package instanceof AliasPackage) {
            $package = $package->getAliasOf();
        }

return $package;
    }

/**
     * @return Generator&string[]
     *
     * @psalm-return Generator<string, string>
     */
    private static function getVersions(Locker $locker, RootPackageInterface $rootPackage): Generator
    {
        $lockData = $locker->getLockData();

$lockData['packages-dev'] = $lockData['packages-dev'] ?? [];

$packages = $lockData['packages'];
        if (getenv('COMPOSER_DEV_MODE') !== '0') {
            $packages = array_merge($packages, $lockData['packages-dev']);
        }
        foreach ($packages as $package) {
            yield $package['name'] => $package['version'] . '@' . (
                $package['source']['reference'] ?? $package['dist']['reference'] ?? ''
            );
        }

foreach ($rootPackage->getReplaces() as $replace) {
            $version = $replace->getPrettyConstraint();
            if ($version === 'self.version') {
                $version = $rootPackage->getPrettyVersion();
            }

yield $replace->getTarget() => $version . '@' . $rootPackage->getSourceReference();
        }

yield $rootPackage->getName() => $rootPackage->getPrettyVersion() . '@' . $rootPackage->getSourceReference();
    }
}