Converter.php

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<?php
namespace Magento\Integration\Model\Config;

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    const KEY_EMAIL = 'email';

    const KEY_AUTHENTICATION_ENDPOINT_URL = 'endpoint_url';

    const KEY_IDENTITY_LINKING_URL = 'identity_link_url';

    public function convert($source)
    {
        $result = [];
        $integrations = $source->getElementsByTagName('integration');
        foreach ($integrations as $integration) {
            if ($integration->nodeType != XML_ELEMENT_NODE) {
                continue;
            }
            $integrationName = $integration->attributes->getNamedItem('name')->nodeValue;
            $result[$integrationName] = [];

            $email = $integration->getElementsByTagName('email')->item(0)->nodeValue;
            $result[$integrationName][self::KEY_EMAIL] = $email;
            if ($integration->getElementsByTagName('endpoint_url')->length) {
                $endpointUrl = $integration->getElementsByTagName('endpoint_url')->item(0)->nodeValue;
                $result[$integrationName][self::KEY_AUTHENTICATION_ENDPOINT_URL] = $endpointUrl;
            }
            if ($integration->getElementsByTagName('identity_link_url')->length) {
                $identityLinkUrl = $integration->getElementsByTagName('identity_link_url')->item(0)->nodeValue;
                $result[$integrationName][self::KEY_IDENTITY_LINKING_URL] = $identityLinkUrl;
            }
        }
        return $result;
    }
}