TokensConfigProvider.php

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<?php
namespace Magento\Vault\Model\Ui;

use Magento\Checkout\Model\ConfigProviderInterface;
use Magento\Framework\App\ObjectManager;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Vault\Api\PaymentMethodListInterface;
use Magento\Vault\Model\CustomerTokenManagement;

class TokensConfigProvider implements ConfigProviderInterface
{
    private static $vaultCode = 'vault';

    private $storeManager;

    private $tokenUiComponentProviders;

    private $customerTokenManagement;

    private $vaultPaymentList;

    public function __construct(
        StoreManagerInterface $storeManager,
        CustomerTokenManagement $customerTokenManagement,
        array $tokenUiComponentProviders = []
    ) {
        $this->storeManager = $storeManager;
        $this->tokenUiComponentProviders = $tokenUiComponentProviders;
        $this->customerTokenManagement = $customerTokenManagement;
    }

    public function getConfig()
    {
        $vaultPayments = [];
        $providers = $this->getComponentProviders();

        if (empty($providers)) {
            return $vaultPayments;
        }

        $tokens = $this->customerTokenManagement->getCustomerSessionTokens();

        foreach ($tokens as $i => $token) {
            $paymentCode = $token->getPaymentMethodCode();
            if (!isset($providers[$paymentCode])) {
                continue;
            }

            $componentProvider = $providers[$paymentCode];
            $component = $componentProvider->getComponentForToken($token);
            $config = $component->getConfig();
            $vaultPaymentCode = !empty($config['code']) ? $config['code'] : $paymentCode;
            $vaultPayments[$vaultPaymentCode . '_' . $i] = [
                'config' => $config,
                'component' => $component->getName()
            ];
        }

        return [
            'payment' => [
                self::$vaultCode => $vaultPayments
            ]
        ];
    }

    private function getComponentProviders()
    {
        $providers = [];
        $storeId = $this->storeManager->getStore()->getId();
        $vaultPaymentMethods = $this->getVaultPaymentList()->getActiveList($storeId);

        foreach ($vaultPaymentMethods as $method) {
            $providerCode = $method->getProviderCode();
            $componentProvider = $this->getComponentProvider($providerCode);
            if ($componentProvider === null) {
                continue;
            }
            $providers[$providerCode] = $componentProvider;
        }

        return $providers;
    }

    private function getComponentProvider($vaultProviderCode)
    {
        $componentProvider = isset($this->tokenUiComponentProviders[$vaultProviderCode])
            ? $this->tokenUiComponentProviders[$vaultProviderCode]
            : null;
        return $componentProvider instanceof TokenUiComponentProviderInterface
            ? $componentProvider
            : null;
    }

    private function getVaultPaymentList()
    {
        if ($this->vaultPaymentList === null) {
            $this->vaultPaymentList = ObjectManager::getInstance()->get(PaymentMethodListInterface::class);
        }
        return $this->vaultPaymentList;
    }
}