packagist/src/Packagist/WebBundle/Service/VersionCache.php

<?php declare(strict_types=1);

namespace Packagist\WebBundle\Service;

use Composer\Repository\VersionCacheInterface;
use Packagist\WebBundle\Entity\Package;
use Packagist\WebBundle\Entity\Version;

class VersionCache implements VersionCacheInterface
{
    /** @var Version[] */
    private $versionCache;
    private $emptyReferences;
    private $package;

    public function __construct(Package $package, array $existingVersions, array $emptyReferences)
    {
        $this->versionCache = [];
        foreach ($existingVersions as $version) {
            $this->versionCache[$version['version']] = $version;
        }
        $this->package = $package;
        $this->emptyReferences = $emptyReferences;
    }

    public function getVersionPackage($version, $identifier)
    {
        if (!empty($this->versionCache[$version]['source']['reference']) && $this->versionCache[$version]['source']['reference'] === $identifier) {
            return [
                'name' => $this->package->getName(),
                'version' => $this->versionCache[$version]['version'],
                'version_normalized' => $this->versionCache[$version]['normalizedVersion'],
                'source' => $this->versionCache[$version]['source'],
            ];
        }

        if (in_array($identifier, $this->emptyReferences, true)) {
            return false;
        }

        return null;
    }
}