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Editing: class-my-yoast-route.php

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<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Admin
 */

/**
 * Represents the route for MyYoast.
 */
class WPSEO_MyYoast_Route implements WPSEO_WordPress_Integration {

/**
	 * The identifier of the page in the My Yoast route.
	 *
	 * @var string
	 */
	const PAGE_IDENTIFIER = 'wpseo_myyoast';

/**
	 * The instance of the MyYoast client.
	 *
	 * @var WPSEO_MyYoast_Client
	 */
	protected $client;

/**
	 * The actions that are supported.
	 *
	 * Each action should have a method named equally to the action.
	 *
	 * For example:
	 * The connect action is handled by a method named 'connect'.
	 *
	 * @var array
	 */
	protected static $allowed_actions = [ 'connect', 'authorize', 'complete' ];

/**
	 * Sets the hooks when the user has enough rights and is on the right page.
	 *
	 * @return void
	 */
	public function register_hooks() {
		$route = filter_input( INPUT_GET, 'page' );
		if ( ! ( $this->is_myyoast_route( $route ) && $this->can_access_route() ) ) {
			return;
		}

if ( ! $this->is_valid_action( $this->get_action() ) ) {
			return;
		}

add_action( 'admin_menu', [ $this, 'register_route' ] );
		add_action( 'admin_init', [ $this, 'handle_route' ] );
	}

/**
	 * Registers the page for the MyYoast route.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return void
	 */
	public function register_route() {
		add_dashboard_page(
			'', // Is empty because we don't render a page.
			'', // Is empty because we don't want a menu item.
			'wpseo_manage_options',
			self::PAGE_IDENTIFIER
		);
	}

/**
	 * Abstracts the action from the URL and follows the appropriate route.
	 *
	 * @return void
	 */
	public function handle_route() {
		$action = $this->get_action();

if ( ! $this->is_valid_action( $action ) || ! method_exists( $this, $action ) ) {
			return;
		}

// Dynamically call the method.
		$this->$action();
	}

/**
	 * Checks if the current page is the MyYoast route.
	 *
	 * @param string $route The MyYoast route.
	 *
	 * @return bool True when url is the MyYoast route.
	 */
	protected function is_myyoast_route( $route ) {
		return ( $route === self::PAGE_IDENTIFIER );
	}

/**
	 * Compares an action to a list of allowed actions to see if it is valid.
	 *
	 * @param string $action The action to check.
	 *
	 * @return bool True if the action is valid.
	 */
	protected function is_valid_action( $action ) {
		return in_array( $action, self::$allowed_actions, true );
	}

/**
	 * Connects to MyYoast and generates a new clientId.
	 *
	 * @return void
	 */
	protected function connect() {
		$client_id = $this->generate_uuid();

$this->save_client_id( $client_id );

$this->redirect(
			'https://my.yoast.com/connect',
			[
				'url'             => WPSEO_Utils::get_home_url(),
				'client_id'       => $client_id,
				'extensions'      => $this->get_extensions(),
				'redirect_url'    => admin_url( 'admin.php?page=' . self::PAGE_IDENTIFIER . '&action=complete' ),
				'credentials_url' => rest_url( 'yoast/v1/myyoast/connect' ),
				'type'            => 'wordpress',
			]
		);
	}

/**
	 * Redirects the user to the oAuth authorization page.
	 *
	 * @return void
	 */
	protected function authorize() {
		$client = $this->get_client();

if ( ! $client->has_configuration() ) {
			return;
		}

$this->redirect(
			$client->get_provider()->getAuthorizationUrl()
		);
	}

/**
	 * Completes the oAuth connection flow.
	 *
	 * @return void
	 */
	protected function complete() {
		$client = $this->get_client();

if ( ! $client->has_configuration() ) {
			return;
		}

try {
			$access_token = $client
				->get_provider()
				->getAccessToken(
					'authorization_code',
					[
						'code' => $this->get_authorization_code(),
					]
				);

$client->save_access_token(
				$this->get_current_user_id(),
				$access_token
			);
		}
			// @codingStandardsIgnoreLine Generic.CodeAnalysis.EmptyStatement.DetectedCATCH -- There is nothing to do.
		catch ( Exception $e ) {
			// Do nothing.
		}

$this->redirect_to_premium_page();
	}

/**
	 * Saves the client id.
	 *
	 * @codeCoverageIgnore
	 *
	 * @param string $client_id The client id to save.
	 *
	 * @return void
	 */
	protected function save_client_id( $client_id ) {
		$this->get_client()->save_configuration(
			[
				'clientId' => $client_id,
			]
		);
	}

/**
	 * Creates a new MyYoast Client instance.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return WPSEO_MyYoast_Client Instance of the myyoast client.
	 */
	protected function get_client() {
		if ( ! $this->client ) {
			$this->client = new WPSEO_MyYoast_Client();
		}

return $this->client;
	}

/**
	 * Abstracts the action from the url.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return string The action from the url.
	 */
	protected function get_action() {
		return filter_input( INPUT_GET, 'action' );
	}

/**
	 * Abstracts the authorization code from the url.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return string The action from the url.
	 */
	protected function get_authorization_code() {
		return filter_input( INPUT_GET, 'code' );
	}

/**
	 * Retrieves a list of activated extensions slugs.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return array The extensions slugs.
	 */
	protected function get_extensions() {
		$addon_manager = new WPSEO_Addon_Manager();

return array_keys( $addon_manager->get_subscriptions_for_active_addons() );
	}

/**
	 * Generates an URL-encoded query string, redirects there.
	 *
	 * @codeCoverageIgnore
	 *
	 * @param string $url        The url to redirect to.
	 * @param array  $query_args The additional arguments to build the url from.
	 *
	 * @return void
	 */
	protected function redirect( $url, $query_args = [] ) {
		if ( ! empty( $query_args ) ) {
			$url .= '?' . http_build_query( $query_args );
		}

wp_redirect( $url );
		exit;
	}

/**
	 * Checks if current user is allowed to access the route.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return bool True when current user has rights to manage options.
	 */
	protected function can_access_route() {
		return WPSEO_Utils::has_access_token_support() && current_user_can( 'wpseo_manage_options' );
	}

/**
	 * Generates an unique user id.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return string The generated unique user id.
	 */
	protected function generate_uuid() {
		return wp_generate_uuid4();
	}

/**
	 * Retrieves the current user id.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return int The user id.
	 */
	protected function get_current_user_id() {
		return get_current_user_id();
	}

/**
	 * Redirects to the premium page.
	 *
	 * @codeCoverageIgnore
	 *
	 * @return void
	 */
	protected function redirect_to_premium_page() {
		wp_safe_redirect( admin_url( 'admin.php?page=wpseo_licenses' ) );
		exit;
	}
}

Editing: class-my-yoast-route.php

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