vendor/braintree/braintree_php/lib/Braintree/CredentialsParser.php

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<?php

namespace Braintree;

/**
 * CredentialsParser registry
 */

class CredentialsParser
{
    private $_clientId;
    private $_clientSecret;
    private $_accessToken;
    private $_environment;
    private $_merchantId;

    // phpcs:ignore PEAR.Commenting.FunctionComment.Missing
    public function __construct($attribs)
    {
        foreach ($attribs as $kind => $value) {
            if ($kind == 'clientId') {
                $this->_clientId = $value;
            }
            if ($kind == 'clientSecret') {
                $this->_clientSecret = $value;
            }
            if ($kind == 'accessToken') {
                $this->_accessToken = $value;
            }
        }
        $this->parse();
    }

    private static $_validEnvironments = [
        'development',
        'integration',
        'sandbox',
        'production',
        'qa',
    ];

    /*
     * Parses environment credentials and sets the _environment variable
     *
     * @return object|Exception\Configuration
     */
    public function parse()
    {
        $environments = [];
        if (!empty($this->_clientId)) {
            $environments[] = ['clientId', $this->_parseClientCredential('clientId', $this->_clientId, 'client_id')];
        }
        if (!empty($this->_clientSecret)) {
            // phpcs:ignore Generic.Files.LineLength
            $environments[] = ['clientSecret', $this->_parseClientCredential('clientSecret', $this->_clientSecret, 'client_secret')];
        }
        if (!empty($this->_accessToken)) {
            $environments[] = ['accessToken', $this->_parseAccessToken()];
        }