ApiLinkAccount.php

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<?php
use MediaWiki\Auth\AuthManager;
use MediaWiki\Auth\AuthenticationResponse;

class ApiLinkAccount extends ApiBase {

    public function __construct( ApiMain $main, $action ) {
        parent::__construct( $main, $action, 'link' );
    }

    public function getFinalDescription() {
        // A bit of a hack to append 'api-help-authmanager-general-usage'
        $msgs = parent::getFinalDescription();
        $msgs[] = ApiBase::makeMessage( 'api-help-authmanager-general-usage', $this->getContext(), [
            $this->getModulePrefix(),
            $this->getModuleName(),
            $this->getModulePath(),
            AuthManager::ACTION_LINK,
            self::needsToken(),
        ] );
        return $msgs;
    }

    public function execute() {
        if ( !$this->getUser()->isLoggedIn() ) {
            $this->dieUsage( 'Must be logged in to link accounts', 'notloggedin' );
        }

        $params = $this->extractRequestParams();

        $this->requireAtLeastOneParameter( $params, 'continue', 'returnurl' );

        if ( $params['returnurl'] !== null ) {
            $bits = wfParseUrl( $params['returnurl'] );
            if ( !$bits || $bits['scheme'] === '' ) {
                $encParamName = $this->encodeParamName( 'returnurl' );
                $this->dieUsage(
                    "Invalid value '{$params['returnurl']}' for url parameter $encParamName",
                    "badurl_{$encParamName}"
                );
            }
        }

        $helper = new ApiAuthManagerHelper( $this );
        $manager = AuthManager::singleton();

        // Check security-sensitive operation status
        $helper->securitySensitiveOperation( 'LinkAccounts' );

        // Make sure it's possible to link accounts
        if ( !$manager->canLinkAccounts() ) {
            $this->getResult()->addValue( null, 'linkaccount', $helper->formatAuthenticationResponse(
                AuthenticationResponse::newFail( $this->msg( 'userlogin-cannot-' . AuthManager::ACTION_LINK ) )
            ) );
            return;
        }

        // Perform the link step
        if ( $params['continue'] ) {
            $reqs = $helper->loadAuthenticationRequests( AuthManager::ACTION_LINK_CONTINUE );
            $res = $manager->continueAccountLink( $reqs );
        } else {
            $reqs = $helper->loadAuthenticationRequests( AuthManager::ACTION_LINK );
            $res = $manager->beginAccountLink( $this->getUser(), $reqs, $params['returnurl'] );
        }

        $this->getResult()->addValue( null, 'linkaccount',
            $helper->formatAuthenticationResponse( $res ) );
    }

    public function isReadMode() {
        return false;
    }

    public function isWriteMode() {
        return true;
    }

    public function needsToken() {
        return 'csrf';
    }

    public function getAllowedParams() {
        return ApiAuthManagerHelper::getStandardParams( AuthManager::ACTION_LINK,
            'requests', 'messageformat', 'mergerequestfields', 'returnurl', 'continue'
        );
    }

    public function dynamicParameterDocumentation() {
        return [ 'api-help-authmanagerhelper-additional-params', AuthManager::ACTION_LINK ];
    }

    protected function getExamplesMessages() {
        return [
            'action=linkaccount&provider=Example&linkreturnurl=http://example.org/&linktoken=123ABC'
                => 'apihelp-linkaccount-example-link',
        ];
    }

    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/API:Linkaccount';
    }
}