Use adaptive CDN TTLs for page views

[mediawiki.git] / includes / api / ApiAuthManagerHelper.php

<?php
/**
 * Copyright © 2016 Brad Jorsch <bjorsch@wikimedia.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @since 1.27
 */

use MediaWiki\Auth\AuthManager;
use MediaWiki\Auth\AuthenticationRequest;
use MediaWiki\Auth\AuthenticationResponse;
use MediaWiki\Auth\CreateFromLoginAuthenticationRequest;
use MediaWiki\Logger\LoggerFactory;

/**
 * Helper class for AuthManager-using API modules. Intended for use via
 * composition.
 *
 * @ingroup API
 */
class ApiAuthManagerHelper {

        /** @var ApiBase API module, for context and parameters */
        private $module;

        /** @var string Message output format */
        private $messageFormat;

        /**
         * @param ApiBase $module API module, for context and parameters
         */
        public function __construct( ApiBase $module ) {
                $this->module = $module;

                $params = $module->extractRequestParams();
                $this->messageFormat = isset( $params['messageformat'] ) ? $params['messageformat'] : 'wikitext';
        }

        /**
         * Static version of the constructor, for chaining
         * @param ApiBase $module API module, for context and parameters
         * @return ApiAuthManagerHelper
         */
        public static function newForModule( ApiBase $module ) {
                return new self( $module );
        }

        /**
         * Format a message for output
         * @param array &$res Result array
         * @param string $key Result key
         * @param Message $message
         */
        private function formatMessage( array &$res, $key, Message $message ) {
                switch ( $this->messageFormat ) {
                        case 'none':
                                break;

                        case 'wikitext':
                                $res[$key] = $message->setContext( $this->module )->text();
                                break;

                        case 'html':
                                $res[$key] = $message->setContext( $this->module )->parseAsBlock();
                                $res[$key] = Parser::stripOuterParagraph( $res[$key] );
                                break;

                        case 'raw':
                                $res[$key] = [
                                        'key' => $message->getKey(),
                                        'params' => $message->getParams(),
                                ];
                                break;
                }
        }

        /**
         * Call $manager->securitySensitiveOperationStatus()
         * @param string $operation Operation being checked.
         * @throws UsageException
         */
        public function securitySensitiveOperation( $operation ) {
                $status = AuthManager::singleton()->securitySensitiveOperationStatus( $operation );
                switch ( $status ) {
                        case AuthManager::SEC_OK:
                                return;

                        case AuthManager::SEC_REAUTH:
                                $this->module->dieUsage(
                                        'You have not authenticated recently in this session, please reauthenticate.', 'reauthenticate'
                                );

                        case AuthManager::SEC_FAIL:
                                $this->module->dieUsage(
                                        'This action is not available as your identify cannot be verified.', 'cannotreauthenticate'
                                );

                        default:
                                throw new UnexpectedValueException( "Unknown status \"$status\"" );
                }
        }

        /**
         * Filter out authentication requests by class name
         * @param AuthenticationRequest[] $reqs Requests to filter
         * @param string[] $blacklist Class names to remove
         * @return AuthenticationRequest[]
         */
        public static function blacklistAuthenticationRequests( array $reqs, array $blacklist ) {
                if ( $blacklist ) {
                        $blacklist = array_flip( $blacklist );
                        $reqs = array_filter( $reqs, function ( $req ) use ( $blacklist ) {
                                return !isset( $blacklist[get_class( $req )] );
                        } );
                }
                return $reqs;
        }

        /**
         * Fetch and load the AuthenticationRequests for an action
         * @param string $action One of the AuthManager::ACTION_* constants
         * @return AuthenticationRequest[]
         */
        public function loadAuthenticationRequests( $action ) {
                $params = $this->module->extractRequestParams();

                $manager = AuthManager::singleton();
                $reqs = $manager->getAuthenticationRequests( $action, $this->module->getUser() );

                // Filter requests, if requested to do so
                $wantedRequests = null;
                if ( isset( $params['requests'] ) ) {
                        $wantedRequests = array_flip( $params['requests'] );
                } elseif ( isset( $params['request'] ) ) {
                        $wantedRequests = [ $params['request'] => true ];
                }
                if ( $wantedRequests !== null ) {
                        $reqs = array_filter( $reqs, function ( $req ) use ( $wantedRequests ) {
                                return isset( $wantedRequests[$req->getUniqueId()] );
                        } );
                }

                // Collect the fields for all the requests
                $fields = [];
                $sensitive = [];
                foreach ( $reqs as $req ) {
                        $info = (array)$req->getFieldInfo();
                        $fields += $info;
                        $sensitive += array_filter( $info, function ( $opts ) {
                                return !empty( $opts['sensitive'] );
                        } );
                }

                // Extract the request data for the fields and mark those request
                // parameters as used
                $data = array_intersect_key( $this->module->getRequest()->getValues(), $fields );
                $this->module->getMain()->markParamsUsed( array_keys( $data ) );

                if ( $sensitive ) {
                        try {
                                $this->module->requirePostedParameters( array_keys( $sensitive ), 'noprefix' );
                        } catch ( UsageException $ex ) {
                                // Make this a warning for now, upgrade to an error in 1.29.
                                $this->module->setWarning( $ex->getMessage() );
                                $this->module->logFeatureUsage( $this->module->getModuleName() . '-params-in-query-string' );
                        }
                }

                return AuthenticationRequest::loadRequestsFromSubmission( $reqs, $data );
        }

        /**
         * Format an AuthenticationResponse for return
         * @param AuthenticationResponse $res
         * @return array
         */
        public function formatAuthenticationResponse( AuthenticationResponse $res ) {
                $params = $this->module->extractRequestParams();

                $ret = [
                        'status' => $res->status,
                ];

                if ( $res->status === AuthenticationResponse::PASS && $res->username !== null ) {
                        $ret['username'] = $res->username;
                }

                if ( $res->status === AuthenticationResponse::REDIRECT ) {
                        $ret['redirecttarget'] = $res->redirectTarget;
                        if ( $res->redirectApiData !== null ) {
                                $ret['redirectdata'] = $res->redirectApiData;
                        }
                }

                if ( $res->status === AuthenticationResponse::REDIRECT ||
                        $res->status === AuthenticationResponse::UI ||
                        $res->status === AuthenticationResponse::RESTART
                ) {
                        $ret += $this->formatRequests( $res->neededRequests );
                }

                if ( $res->status === AuthenticationResponse::FAIL ||
                        $res->status === AuthenticationResponse::UI ||
                        $res->status === AuthenticationResponse::RESTART
                ) {
                        $this->formatMessage( $ret, 'message', $res->message );
                }

                if ( $res->status === AuthenticationResponse::FAIL ||
                        $res->status === AuthenticationResponse::RESTART
                ) {
                        $this->module->getRequest()->getSession()->set(
                                'ApiAuthManagerHelper::createRequest',
                                $res->createRequest
                        );
                        $ret['canpreservestate'] = $res->createRequest !== null;
                } else {
                        $this->module->getRequest()->getSession()->remove( 'ApiAuthManagerHelper::createRequest' );
                }

                return $ret;
        }

        /**
         * Logs successful or failed authentication.
         * @param string|AuthenticationResponse $result Response or error message
         * @param string $event Event type (e.g. 'accountcreation')
         */
        public function logAuthenticationResult( $event, $result ) {
                if ( is_string( $result ) ) {
                        $status = Status::newFatal( $result );
                } elseif ( $result->status === AuthenticationResponse::PASS ) {
                        $status = Status::newGood();
                } elseif ( $result->status === AuthenticationResponse::FAIL ) {
                        $status = Status::newFatal( $result->message );
                } else {
                        return;
                }

                $module = $this->module->getModuleName();
                LoggerFactory::getInstance( 'authevents' )->info( "$module API attempt", [
                        'event' => $event,
                        'status' => $status,
                        'module' => $module,
                ] );
        }

        /**
         * Fetch the preserved CreateFromLoginAuthenticationRequest, if any
         * @return CreateFromLoginAuthenticationRequest|null
         */
        public function getPreservedRequest() {
                $ret = $this->module->getRequest()->getSession()->get( 'ApiAuthManagerHelper::createRequest' );
                return $ret instanceof CreateFromLoginAuthenticationRequest ? $ret : null;
        }

        /**
         * Format an array of AuthenticationRequests for return
         * @param AuthenticationRequest[] $reqs
         * @return array Will have a 'requests' key, and also 'fields' if $module's
         *  params include 'mergerequestfields'.
         */
        public function formatRequests( array $reqs ) {
                $params = $this->module->extractRequestParams();
                $mergeFields = !empty( $params['mergerequestfields'] );

                $ret = [ 'requests' => [] ];
                foreach ( $reqs as $req ) {
                        $describe = $req->describeCredentials();
                        $reqInfo = [
                                'id' => $req->getUniqueId(),
                                'metadata' => $req->getMetadata() + [ ApiResult::META_TYPE => 'assoc' ],
                        ];
                        switch ( $req->required ) {
                                case AuthenticationRequest::OPTIONAL:
                                        $reqInfo['required'] = 'optional';
                                        break;
                                case AuthenticationRequest::REQUIRED:
                                        $reqInfo['required'] = 'required';
                                        break;
                                case AuthenticationRequest::PRIMARY_REQUIRED:
                                        $reqInfo['required'] = 'primary-required';
                                        break;
                        }
                        $this->formatMessage( $reqInfo, 'provider', $describe['provider'] );
                        $this->formatMessage( $reqInfo, 'account', $describe['account'] );
                        if ( !$mergeFields ) {
                                $reqInfo['fields'] = $this->formatFields( (array)$req->getFieldInfo() );
                        }
                        $ret['requests'][] = $reqInfo;
                }

                if ( $mergeFields ) {
                        $fields = AuthenticationRequest::mergeFieldInfo( $reqs );
                        $ret['fields'] = $this->formatFields( $fields );
                }

                return $ret;
        }

        /**
         * Clean up a field array for output
         * @param ApiBase $module For context and parameters 'mergerequestfields'
         *  and 'messageformat'
         * @param array $fields
         * @return array
         */
        private function formatFields( array $fields ) {
                static $copy = [
                        'type' => true,
                        'value' => true,
                ];

                $module = $this->module;
                $retFields = [];

                foreach ( $fields as $name => $field ) {
                        $ret = array_intersect_key( $field, $copy );

                        if ( isset( $field['options'] ) ) {
                                $ret['options'] = array_map( function ( $msg ) use ( $module ) {
                                        return $msg->setContext( $module )->plain();
                                }, $field['options'] );
                                ApiResult::setArrayType( $ret['options'], 'assoc' );
                        }
                        $this->formatMessage( $ret, 'label', $field['label'] );
                        $this->formatMessage( $ret, 'help', $field['help'] );
                        $ret['optional'] = !empty( $field['optional'] );
                        $ret['sensitive'] = !empty( $field['sensitive'] );

                        $retFields[$name] = $ret;
                }

                ApiResult::setArrayType( $retFields, 'assoc' );

                return $retFields;
        }

        /**
         * Fetch the standard parameters this helper recognizes
         * @param string $action AuthManager action
         * @param string $param... Parameters to use
         * @return array
         */
        public static function getStandardParams( $action, $param /* ... */ ) {
                $params = [
                        'requests' => [
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_HELP_MSG => [ 'api-help-authmanagerhelper-requests', $action ],
                        ],
                        'request' => [
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_REQUIRED => true,
                                ApiBase::PARAM_HELP_MSG => [ 'api-help-authmanagerhelper-request', $action ],
                        ],
                        'messageformat' => [
                                ApiBase::PARAM_DFLT => 'wikitext',
                                ApiBase::PARAM_TYPE => [ 'html', 'wikitext', 'raw', 'none' ],
                                ApiBase::PARAM_HELP_MSG => 'api-help-authmanagerhelper-messageformat',
                        ],
                        'mergerequestfields' => [
                                ApiBase::PARAM_DFLT => false,
                                ApiBase::PARAM_HELP_MSG => 'api-help-authmanagerhelper-mergerequestfields',
                        ],
                        'preservestate' => [
                                ApiBase::PARAM_DFLT => false,
                                ApiBase::PARAM_HELP_MSG => 'api-help-authmanagerhelper-preservestate',
                        ],
                        'returnurl' => [
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_HELP_MSG => 'api-help-authmanagerhelper-returnurl',
                        ],
                        'continue' => [
                                ApiBase::PARAM_DFLT => false,
                                ApiBase::PARAM_HELP_MSG => 'api-help-authmanagerhelper-continue',
                        ],
                ];

                $ret = [];
                $wantedParams = func_get_args();
                array_shift( $wantedParams );
                foreach ( $wantedParams as $name ) {
                        if ( isset( $params[$name] ) ) {
                                $ret[$name] = $params[$name];
                        }
                }
                return $ret;
        }
}