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[mediawiki.git] / includes / specialpage / FormSpecialPage.php

<?php
/**
 * Special page which uses an HTMLForm to handle processing.
 *
 * 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
 * @ingroup SpecialPage
 */

namespace MediaWiki\SpecialPage;

use MediaWiki\Context\DerivativeContext;
use MediaWiki\Debug\MWDebug;
use MediaWiki\HTMLForm\HTMLForm;
use MediaWiki\Request\DerivativeRequest;
use MediaWiki\Status\Status;
use MediaWiki\User\User;
use UserBlockedError;

/**
 * Special page which uses an HTMLForm to handle processing.  This is mostly a
 * clone of FormAction.  More special pages should be built this way; maybe this could be
 * a new structure for SpecialPages.
 *
 * @ingroup SpecialPage
 */
abstract class FormSpecialPage extends SpecialPage {
        /**
         * The subpage of the special page.
         * @var string|null
         */
        protected $par = null;

        /**
         * @var array|null POST data preserved across re-authentication
         * @since 1.32
         */
        protected $reauthPostData = null;

        /**
         * Get an HTMLForm descriptor array
         * @return array
         */
        abstract protected function getFormFields();

        /**
         * Add pre-HTML to the form
         * @return string HTML which will be sent to $form->addPreHtml()
         * @since 1.38
         */
        protected function preHtml() {
                return '';
        }

        /**
         * Add post-HTML to the form
         * @return string HTML which will be sent to $form->addPostHtml()
         * @since 1.38
         */
        protected function postHtml() {
                return '';
        }

        /**
         * Add pre-text to the form
         * @return string HTML which will be sent to $form->addPreHtml()
         * @deprecated since 1.38, use preHtml() instead, hard-deprecated since 1.43
         */
        protected function preText() {
                wfDeprecated( __METHOD__, '1.38' );
                return $this->preHtml();
        }

        /**
         * Add post-text to the form
         * @return string HTML which will be sent to $form->addPostHtml()
         * @deprecated since 1.38, use postHtml() instead, hard-deprecated since 1.43
         */
        protected function postText() {
                wfDeprecated( __METHOD__, '1.38' );
                return $this->postHtml();
        }

        /**
         * Play with the HTMLForm if you need to more substantially
         * @param HTMLForm $form
         */
        protected function alterForm( HTMLForm $form ) {
        }

        /**
         * Get message prefix for HTMLForm
         *
         * @since 1.21
         * @return string
         */
        protected function getMessagePrefix() {
                return strtolower( $this->getName() );
        }

        /**
         * Get display format for the form. See HTMLForm documentation for available values.
         *
         * @since 1.25
         * @return string
         */
        protected function getDisplayFormat() {
                return 'table';
        }

        /**
         * Get the HTMLForm to control behavior
         * @return HTMLForm|null
         */
        protected function getForm() {
                $context = $this->getContext();
                $onSubmit = [ $this, 'onSubmit' ];

                if ( $this->reauthPostData ) {
                        // Restore POST data
                        $context = new DerivativeContext( $context );
                        $oldRequest = $this->getRequest();
                        $context->setRequest( new DerivativeRequest(
                                $oldRequest, $this->reauthPostData + $oldRequest->getQueryValues(), true
                        ) );

                        // But don't treat it as a "real" submission just in case of some
                        // crazy kind of CSRF.
                        $onSubmit = static function () {
                                return false;
                        };
                }

                $form = HTMLForm::factory(
                        $this->getDisplayFormat(),
                        $this->getFormFields(),
                        $context,
                        $this->getMessagePrefix()
                );
                if ( !$this->requiresPost() ) {
                        $form->setMethod( 'get' );
                }
                $form->setSubmitCallback( $onSubmit );
                if ( $this->getDisplayFormat() !== 'ooui' ) {
                        // No legend and wrapper by default in OOUI forms, but can be set manually
                        // from alterForm()
                        $form->setWrapperLegendMsg( $this->getMessagePrefix() . '-legend' );
                }

                $headerMsg = $this->msg( $this->getMessagePrefix() . '-text' );
                if ( !$headerMsg->isDisabled() ) {
                        $form->addHeaderHtml( $headerMsg->parseAsBlock() );
                }

                // preText / postText are deprecated, but we need to keep calling them until the end of
                // the deprecation process so a subclass overriding *Text and *Html both work
                $form->addPreHtml( MWDebug::detectDeprecatedOverride( $this, __CLASS__, 'preText', '1.38' )
                        ? $this->preText()
                        : $this->preHtml()
                );
                $form->addPostHtml( MWDebug::detectDeprecatedOverride( $this, __CLASS__, 'postText', '1.38' )
                        ? $this->postText()
                        : $this->postHtml()
                );

                // Give precedence to subpage syntax
                $field = $this->getSubpageField();
                // cast to string so that "0" is not thrown away
                if ( strval( $this->par ) !== '' && $field ) {
                        $this->getRequest()->setVal( $form->getField( $field )->getName(), $this->par );
                        $form->setTitle( $this->getPageTitle() );
                }
                $this->alterForm( $form );
                if ( $form->getMethod() == 'post' ) {
                        // Retain query parameters (uselang etc) on POST requests
                        $params = array_diff_key(
                                $this->getRequest()->getQueryValues(), [ 'title' => null ] );
                        $form->addHiddenField( 'redirectparams', wfArrayToCgi( $params ) );
                }

                // Give hooks a chance to alter the form, adding extra fields or text etc
                $this->getHookRunner()->onSpecialPageBeforeFormDisplay( $this->getName(), $form );

                return $form;
        }

        /**
         * Process the form on submission.
         * @phpcs:disable MediaWiki.Commenting.FunctionComment.ExtraParamComment
         * @param array $data
         * @param HTMLForm|null $form
         * @suppress PhanCommentParamWithoutRealParam Many implementations don't have $form
         * @return bool|string|array|Status As documented for HTMLForm::trySubmit.
         * @phpcs:enable MediaWiki.Commenting.FunctionComment.ExtraParamComment
         */
        abstract public function onSubmit( array $data /* HTMLForm $form = null */ );

        /**
         * Do something exciting on successful processing of the form, most likely to show a
         * confirmation message
         * @since 1.22 Default is to do nothing
         */
        public function onSuccess() {
        }

        /**
         * Basic SpecialPage workflow: get a form, send it to the user; get some data back,
         *
         * @param string|null $par Subpage string if one was specified
         */
        public function execute( $par ) {
                $this->setParameter( $par );
                $this->setHeaders();
                $this->outputHeader();

                // This will throw exceptions if there's a problem
                $this->checkExecutePermissions( $this->getUser() );

                $securityLevel = $this->getLoginSecurityLevel();
                if ( $securityLevel !== false && !$this->checkLoginSecurityLevel( $securityLevel ) ) {
                        return;
                }

                $form = $this->getForm();
                // GET forms can be set as includable
                if ( !$this->including() ) {
                        $result = $this->getShowAlways() ? $form->showAlways() : $form->show();
                } else {
                        $result = $form->prepareForm()->tryAuthorizedSubmit();
                }
                if ( $result === true || ( $result instanceof Status && $result->isGood() ) ) {
                        $this->onSuccess();
                }
        }

        /**
         * Whether the form should always be shown despite the success of submission.
         * @since 1.40
         * @return bool
         */
        protected function getShowAlways() {
                return false;
        }

        /**
         * Maybe do something interesting with the subpage parameter
         * @param string|null $par
         */
        protected function setParameter( $par ) {
                $this->par = $par;
        }

        /**
         * Override this function to set the field name used in the subpage syntax.
         * @since 1.40
         * @return false|string
         */
        protected function getSubpageField() {
                return false;
        }

        /**
         * Called from execute() to check if the given user can perform this action.
         * Failures here must throw subclasses of ErrorPageError.
         * @param User $user
         * @throws UserBlockedError
         */
        protected function checkExecutePermissions( User $user ) {
                $this->checkPermissions();

                if ( $this->requiresUnblock() ) {
                        $block = $user->getBlock();
                        if ( $block && $block->isSitewide() ) {
                                throw new UserBlockedError(
                                        $block,
                                        $user,
                                        $this->getLanguage(),
                                        $this->getRequest()->getIP()
                                );
                        }
                }

                if ( $this->requiresWrite() ) {
                        $this->checkReadOnly();
                }
        }

        /**
         * Whether this action should using POST method to submit, default to true
         * @since 1.40
         * @return bool
         */
        public function requiresPost() {
                return true;
        }

        /**
         * Whether this action requires the wiki not to be locked, default to requiresPost()
         * @return bool
         */
        public function requiresWrite() {
                return $this->requiresPost();
        }

        /**
         * Whether this action cannot be executed by a blocked user, default to requiresPost()
         * @return bool
         */
        public function requiresUnblock() {
                return $this->requiresPost();
        }

        /**
         * Preserve POST data across reauthentication
         *
         * @since 1.32
         * @param array $data
         */
        protected function setReauthPostData( array $data ) {
                $this->reauthPostData = $data;
        }
}

/** @deprecated class alias since 1.41 */
class_alias( FormSpecialPage::class, 'FormSpecialPage' );