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Editing: AuthAbstract.php

<?php

namespace WPMailSMTP\Providers;

use WPMailSMTP\ConnectionInterface;
use WPMailSMTP\Options;

/**
 * Class AuthAbstract.
 *
 * @since 1.0.0
 */
abstract class AuthAbstract implements AuthInterface {

/**
	 * The Connection object.
	 *
	 * @since 3.7.0
	 *
	 * @var ConnectionInterface
	 */
	protected $connection;

/**
	 * The connection options object.
	 *
	 * @since 3.7.0
	 *
	 * @var Options
	 */
	protected $connection_options;

/**
	 * Mailer DB options.
	 *
	 * @since 1.0.0
	 *
	 * @var array
	 */
	protected $options = [];

/**
	 * @since 1.0.0
	 *
	 * @var mixed
	 */
	protected $client;

/**
	 * Mailer slug.
	 *
	 * @since 1.0.0
	 *
	 * @var string
	 */
	protected $mailer_slug = '';

/**
	 * Key for a stored unique state value.
	 *
	 * @since 1.5.0
	 *
	 * @var string
	 */
	public $state_key = 'wp_mail_smtp_provider_client_state';

/**
	 * Auth constructor.
	 *
	 * @since 1.0.0
	 *
	 * @param ConnectionInterface $connection The Connection object.
	 */
	public function __construct( $connection = null ) {

if ( ! is_null( $connection ) ) {
			$this->connection = $connection;
		} else {
			$this->connection = wp_mail_smtp()->get_connections_manager()->get_primary_connection();
		}

$this->connection_options = $this->connection->get_options();
		$this->mailer_slug        = $this->connection->get_mailer_slug();
	}

/**
	 * Use the composer autoloader to include the auth library and all dependencies.
	 *
	 * @since 1.0.0
	 */
	protected function include_vendor_lib() {

require_once wp_mail_smtp()->plugin_path . '/vendor/autoload.php';
	}

/**
	 * Get the url, that users will be redirected back to finish the OAuth process.
	 *
	 * @since 1.0.0
	 *
	 * @return string
	 */
	public static function get_plugin_auth_url() {

return add_query_arg( 'tab', 'auth', wp_mail_smtp()->get_admin()->get_admin_page_url() );
	}

/**
	 * Update auth code in our DB.
	 *
	 * @since 1.0.0
	 *
	 * @param string $code
	 */
	protected function update_auth_code( $code ) {

$all = $this->connection_options->get_all();

// To save in DB.
		$all[ $this->mailer_slug ]['auth_code'] = $code;

// To save in currently retrieved options array.
		$this->options['auth_code'] = $code;

// NOTE: These options need to be saved by overwriting all options, because WP automatic updates can cause an issue: GH #575!
		$this->connection_options->set( $all, false, true );
	}

/**
	 * Update Setup Wizard flag in our DB.
	 *
	 * @since 2.6.0
	 *
	 * @param boolean $state A state (true/false) to set the is_setup_wizard_auth mailer setting.
	 */
	public function update_is_setup_wizard_auth( $state ) {

$all = $this->connection_options->get_all();

// To save in DB.
		$all[ $this->mailer_slug ]['is_setup_wizard_auth'] = (bool) $state;

// To save in currently retrieved options array.
		$this->options['is_setup_wizard_auth'] = (bool) $state;

// NOTE: These options need to be saved by overwriting all options, because WP automatic updates can cause an issue: GH #575!
		$this->connection_options->set( $all, false, true );
	}

/**
	 * Update access token in our DB.
	 *
	 * @since 1.0.0
	 *
	 * @param mixed $token
	 */
	protected function update_access_token( $token ) {

$all = $this->connection_options->get_all();

// To save in DB.
		$all[ $this->mailer_slug ]['access_token'] = $token;

// To save in currently retrieved options array.
		$this->options['access_token'] = $token;

// NOTE: These options need to be saved by overwriting all options, because WP automatic updates can cause an issue: GH #575!
		$this->connection_options->set( $all, false, true );
	}

/**
	 * Update refresh token in our DB.
	 *
	 * @since 1.0.0
	 *
	 * @param mixed $token
	 */
	protected function update_refresh_token( $token ) {

$all = $this->connection_options->get_all();

// To save in DB.
		$all[ $this->mailer_slug ]['refresh_token'] = $token;

// To save in currently retrieved options array.
		$this->options['refresh_token'] = $token;

// NOTE: These options need to be saved by overwriting all options, because WP automatic updates can cause an issue: GH #575!
		$this->connection_options->set( $all, false, true );
	}

/**
	 * Update access token scopes in our DB.
	 *
	 * @since 3.4.0
	 *
	 * @param array $scopes Scopes array.
	 */
	protected function update_scopes( $scopes ) {

$all = $this->connection_options->get_all();

// To save in DB.
		$all[ $this->mailer_slug ]['scopes'] = $scopes;

// To save in currently retrieved options array.
		$this->options['scopes'] = $scopes;

// NOTE: These options need to be saved by overwriting all options, because WP automatic updates can cause an issue: GH #575!
		$this->connection_options->set( $all, false, true );
	}

/**
	 * Get state value that should be used for `state` parameter in OAuth authorization request.
	 *
	 * @since 3.7.0
	 *
	 * @return string
	 */
	protected function get_state() {

$state = [
			wp_create_nonce( $this->state_key ),
			$this->connection->get_id(),
		];

return implode( '-', $state );
	}

/**
	 * @inheritdoc
	 */
	public function is_clients_saved() {

return ! empty( $this->options['client_id'] ) && ! empty( $this->options['client_secret'] );
	}

/**
	 * @inheritdoc
	 */
	public function is_auth_required() {

return empty( $this->options['access_token'] ) || empty( $this->options['refresh_token'] );
	}
}

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