Expose $wgMaxArticleSize in siteinfo query api

[mediawiki.git] / includes / specials / SpecialEditTags.php

<?php
/**
 * 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
 */

/**
 * Special page for adding and removing change tags to individual revisions.
 * A lot of this is copied out of SpecialRevisiondelete.
 *
 * @ingroup SpecialPage
 * @since 1.25
 */
class SpecialEditTags extends UnlistedSpecialPage {
        /** @var bool Was the DB modified in this request */
        protected $wasSaved = false;

        /** @var bool True if the submit button was clicked, and the form was posted */
        private $submitClicked;

        /** @var array Target ID list */
        private $ids;

        /** @var Title Title object for target parameter */
        private $targetObj;

        /** @var string Deletion type, may be revision or logentry */
        private $typeName;

        /** @var ChangeTagsList Storing the list of items to be tagged */
        private $revList;

        /** @var bool Whether user is allowed to perform the action */
        private $isAllowed;

        /** @var string */
        private $reason;

        public function __construct() {
                parent::__construct( 'EditTags', 'changetags' );
        }

        public function doesWrites() {
                return true;
        }

        public function execute( $par ) {
                $this->checkPermissions();
                $this->checkReadOnly();

                $output = $this->getOutput();
                $user = $this->getUser();
                $request = $this->getRequest();

                // Check blocks
                if ( $user->isBlocked() ) {
                        throw new UserBlockedError( $user->getBlock() );
                }

                $this->setHeaders();
                $this->outputHeader();

                $this->getOutput()->addModules( [ 'mediawiki.special.edittags',
                        'mediawiki.special.edittags.styles' ] );

                $this->submitClicked = $request->wasPosted() && $request->getBool( 'wpSubmit' );

                // Handle our many different possible input types
                $ids = $request->getVal( 'ids' );
                if ( !is_null( $ids ) ) {
                        // Allow CSV from the form hidden field, or a single ID for show/hide links
                        $this->ids = explode( ',', $ids );
                } else {
                        // Array input
                        $this->ids = array_keys( $request->getArray( 'ids', [] ) );
                }
                $this->ids = array_unique( array_filter( $this->ids ) );

                // No targets?
                if ( count( $this->ids ) == 0 ) {
                        throw new ErrorPageError( 'tags-edit-nooldid-title', 'tags-edit-nooldid-text' );
                }

                $this->typeName = $request->getVal( 'type' );
                $this->targetObj = Title::newFromText( $request->getText( 'target' ) );

                // sanity check of parameter
                switch ( $this->typeName ) {
                        case 'logentry':
                        case 'logging':
                                $this->typeName = 'logentry';
                                break;
                        default:
                                $this->typeName = 'revision';
                                break;
                }

                // Allow the list type to adjust the passed target
                // Yuck! Copied straight out of SpecialRevisiondelete, but it does exactly
                // what we want
                $this->targetObj = RevisionDeleter::suggestTarget(
                        $this->typeName === 'revision' ? 'revision' : 'logging',
                        $this->targetObj,
                        $this->ids
                );

                $this->isAllowed = $user->isAllowed( 'changetags' );

                $this->reason = $request->getVal( 'wpReason' );
                // We need a target page!
                if ( is_null( $this->targetObj ) ) {
                        $output->addWikiMsg( 'undelete-header' );
                        return;
                }
                // Give a link to the logs/hist for this page
                $this->showConvenienceLinks();

                // Either submit or create our form
                if ( $this->isAllowed && $this->submitClicked ) {
                        $this->submit();
                } else {
                        $this->showForm();
                }

                // Show relevant lines from the tag log
                $tagLogPage = new LogPage( 'tag' );
                $output->addHTML( "<h2>" . $tagLogPage->getName()->escaped() . "</h2>\n" );
                LogEventsList::showLogExtract(
                        $output,
                        'tag',
                        $this->targetObj,
                        '', /* user */
                        [ 'lim' => 25, 'conds' => [], 'useMaster' => $this->wasSaved ]
                );
        }

        /**
         * Show some useful links in the subtitle
         */
        protected function showConvenienceLinks() {
                // Give a link to the logs/hist for this page
                if ( $this->targetObj ) {
                        // Also set header tabs to be for the target.
                        $this->getSkin()->setRelevantTitle( $this->targetObj );

                        $links = [];
                        $links[] = Linker::linkKnown(
                                SpecialPage::getTitleFor( 'Log' ),
                                $this->msg( 'viewpagelogs' )->escaped(),
                                [],
                                [
                                        'page' => $this->targetObj->getPrefixedText(),
                                        'hide_tag_log' => '0',
                                ]
                        );
                        if ( !$this->targetObj->isSpecialPage() ) {
                                // Give a link to the page history
                                $links[] = Linker::linkKnown(
                                        $this->targetObj,
                                        $this->msg( 'pagehist' )->escaped(),
                                        [],
                                        [ 'action' => 'history' ]
                                );
                        }
                        // Link to Special:Tags
                        $links[] = Linker::linkKnown(
                                SpecialPage::getTitleFor( 'Tags' ),
                                $this->msg( 'tags-edit-manage-link' )->escaped()
                        );
                        // Logs themselves don't have histories or archived revisions
                        $this->getOutput()->addSubtitle( $this->getLanguage()->pipeList( $links ) );
                }
        }

        /**
         * Get the list object for this request
         * @return ChangeTagsList
         */
        protected function getList() {
                if ( is_null( $this->revList ) ) {
                        $this->revList = ChangeTagsList::factory( $this->typeName, $this->getContext(),
                                $this->targetObj, $this->ids );
                }

                return $this->revList;
        }

        /**
         * Show a list of items that we will operate on, and show a form which allows
         * the user to modify the tags applied to those items.
         */
        protected function showForm() {
                $userAllowed = true;

                $out = $this->getOutput();
                // Messages: tags-edit-revision-selected, tags-edit-logentry-selected
                $out->wrapWikiMsg( "<strong>$1</strong>", [
                        "tags-edit-{$this->typeName}-selected",
                        $this->getLanguage()->formatNum( count( $this->ids ) ),
                        $this->targetObj->getPrefixedText()
                ] );

                $this->addHelpLink( 'Help:Tags' );
                $out->addHTML( "<ul>" );

                $numRevisions = 0;
                // Live revisions...
                $list = $this->getList();
                // @codingStandardsIgnoreStart Generic.CodeAnalysis.ForLoopWithTestFunctionCall.NotAllowed
                for ( $list->reset(); $list->current(); $list->next() ) {
                        // @codingStandardsIgnoreEnd
                        $item = $list->current();
                        $numRevisions++;
                        $out->addHTML( $item->getHTML() );
                }

                if ( !$numRevisions ) {
                        throw new ErrorPageError( 'tags-edit-nooldid-title', 'tags-edit-nooldid-text' );
                }

                $out->addHTML( "</ul>" );
                // Explanation text
                $out->wrapWikiMsg( '<p>$1</p>', "tags-edit-{$this->typeName}-explanation" );

                // Show form if the user can submit
                if ( $this->isAllowed ) {
                        $form = Xml::openElement( 'form', [ 'method' => 'post',
                                        'action' => $this->getPageTitle()->getLocalURL( [ 'action' => 'submit' ] ),
                                        'id' => 'mw-revdel-form-revisions' ] ) .
                                Xml::fieldset( $this->msg( "tags-edit-{$this->typeName}-legend",
                                        count( $this->ids ) )->text() ) .
                                $this->buildCheckBoxes() .
                                Xml::openElement( 'table' ) .
                                "<tr>\n" .
                                        '<td class="mw-label">' .
                                                Xml::label( $this->msg( 'tags-edit-reason' )->text(), 'wpReason' ) .
                                        '</td>' .
                                        '<td class="mw-input">' .
                                                Xml::input(
                                                        'wpReason',
                                                        60,
                                                        $this->reason,
                                                        [ 'id' => 'wpReason', 'maxlength' => 100 ]
                                                ) .
                                        '</td>' .
                                "</tr><tr>\n" .
                                        '<td></td>' .
                                        '<td class="mw-submit">' .
                                                Xml::submitButton( $this->msg( "tags-edit-{$this->typeName}-submit",
                                                        $numRevisions )->text(), [ 'name' => 'wpSubmit' ] ) .
                                        '</td>' .
                                "</tr>\n" .
                                Xml::closeElement( 'table' ) .
                                Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() ) .
                                Html::hidden( 'target', $this->targetObj->getPrefixedText() ) .
                                Html::hidden( 'type', $this->typeName ) .
                                Html::hidden( 'ids', implode( ',', $this->ids ) ) .
                                Xml::closeElement( 'fieldset' ) . "\n" .
                                Xml::closeElement( 'form' ) . "\n";
                } else {
                        $form = '';
                }
                $out->addHTML( $form );
        }

        /**
         * @return string HTML
         */
        protected function buildCheckBoxes() {
                // If there is just one item, provide the user with a multi-select field
                $list = $this->getList();
                $tags = [];
                if ( $list->length() == 1 ) {
                        $list->reset();
                        $tags = $list->current()->getTags();
                        if ( $tags ) {
                                $tags = explode( ',', $tags );
                        } else {
                                $tags = [];
                        }

                        $html = '<table id="mw-edittags-tags-selector">';
                        $html .= '<tr><td>' . $this->msg( 'tags-edit-existing-tags' )->escaped() .
                                '</td><td>';
                        if ( $tags ) {
                                $html .= $this->getLanguage()->commaList( array_map( 'htmlspecialchars', $tags ) );
                        } else {
                                $html .= $this->msg( 'tags-edit-existing-tags-none' )->parse();
                        }
                        $html .= '</td></tr>';
                        $tagSelect = $this->getTagSelect( $tags, $this->msg( 'tags-edit-new-tags' )->plain() );
                        $html .= '<tr><td>' . $tagSelect[0] . '</td><td>' . $tagSelect[1];
                } else {
                        // Otherwise, use a multi-select field for adding tags, and a list of
                        // checkboxes for removing them

                        // @codingStandardsIgnoreStart Generic.CodeAnalysis.ForLoopWithTestFunctionCall.NotAllowed
                        for ( $list->reset(); $list->current(); $list->next() ) {
                                // @codingStandardsIgnoreEnd
                                $currentTags = $list->current()->getTags();
                                if ( $currentTags ) {
                                        $tags = array_merge( $tags, explode( ',', $currentTags ) );
                                }
                        }
                        $tags = array_unique( $tags );

                        $html = '<table id="mw-edittags-tags-selector-multi"><tr><td>';
                        $tagSelect = $this->getTagSelect( [], $this->msg( 'tags-edit-add' )->plain() );
                        $html .= '<p>' . $tagSelect[0] . '</p>' . $tagSelect[1] . '</td><td>';
                        $html .= Xml::element( 'p', null, $this->msg( 'tags-edit-remove' )->plain() );
                        $html .= Xml::checkLabel( $this->msg( 'tags-edit-remove-all-tags' )->plain(),
                                'wpRemoveAllTags', 'mw-edittags-remove-all' );
                        $i = 0; // used for generating checkbox IDs only
                        foreach ( $tags as $tag ) {
                                $html .= Xml::element( 'br' ) . "\n" . Xml::checkLabel( $tag,
                                        'wpTagsToRemove[]', 'mw-edittags-remove-' . $i++, false, [
                                                'value' => $tag,
                                                'class' => 'mw-edittags-remove-checkbox',
                                        ] );
                        }
                }

                // also output the tags currently applied as a hidden form field, so we
                // know what to remove from the revision/log entry when the form is submitted
                $html .= Html::hidden( 'wpExistingTags', implode( ',', $tags ) );
                $html .= '</td></tr></table>';

                return $html;
        }

        /**
         * Returns a <select multiple> element with a list of change tags that can be
         * applied by users.
         *
         * @param array $selectedTags The tags that should be preselected in the
         * list. Any tags in this list, but not in the list returned by
         * ChangeTags::listExplicitlyDefinedTags, will be appended to the <select>
         * element.
         * @param string $label The text of a <label> to precede the <select>
         * @return array HTML <label> element at index 0, HTML <select> element at
         * index 1
         */
        protected function getTagSelect( $selectedTags, $label ) {
                $result = [];
                $result[0] = Xml::label( $label, 'mw-edittags-tag-list' );

                $select = new XmlSelect( 'wpTagList[]', 'mw-edittags-tag-list', $selectedTags );
                $select->setAttribute( 'multiple', 'multiple' );
                $select->setAttribute( 'size', '8' );

                $tags = ChangeTags::listExplicitlyDefinedTags();
                $tags = array_unique( array_merge( $tags, $selectedTags ) );

                // Values of $tags are also used as <option> labels
                $select->addOptions( array_combine( $tags, $tags ) );

                $result[1] = $select->getHTML();
                return $result;
        }

        /**
         * UI entry point for form submission.
         * @throws PermissionsError
         * @return bool
         */
        protected function submit() {
                // Check edit token on submission
                $request = $this->getRequest();
                $token = $request->getVal( 'wpEditToken' );
                if ( $this->submitClicked && !$this->getUser()->matchEditToken( $token ) ) {
                        $this->getOutput()->addWikiMsg( 'sessionfailure' );
                        return false;
                }

                // Evaluate incoming request data
                $tagList = $request->getArray( 'wpTagList' );
                if ( is_null( $tagList ) ) {
                        $tagList = [];
                }
                $existingTags = $request->getVal( 'wpExistingTags' );
                if ( is_null( $existingTags ) || $existingTags === '' ) {
                        $existingTags = [];
                } else {
                        $existingTags = explode( ',', $existingTags );
                }

                if ( count( $this->ids ) > 1 ) {
                        // multiple revisions selected
                        $tagsToAdd = $tagList;
                        if ( $request->getBool( 'wpRemoveAllTags' ) ) {
                                $tagsToRemove = $existingTags;
                        } else {
                                $tagsToRemove = $request->getArray( 'wpTagsToRemove' );
                        }
                } else {
                        // single revision selected
                        // The user tells us which tags they want associated to the revision.
                        // We have to figure out which ones to add, and which to remove.
                        $tagsToAdd = array_diff( $tagList, $existingTags );
                        $tagsToRemove = array_diff( $existingTags, $tagList );
                }

                if ( !$tagsToAdd && !$tagsToRemove ) {
                        $status = Status::newFatal( 'tags-edit-none-selected' );
                } else {
                        $status = $this->getList()->updateChangeTagsOnAll( $tagsToAdd,
                                $tagsToRemove, null, $this->reason, $this->getUser() );
                }

                if ( $status->isGood() ) {
                        $this->success();
                        return true;
                } else {
                        $this->failure( $status );
                        return false;
                }
        }

        /**
         * Report that the submit operation succeeded
         */
        protected function success() {
                $this->getOutput()->setPageTitle( $this->msg( 'actioncomplete' ) );
                $this->getOutput()->wrapWikiMsg( "<div class=\"successbox\">\n$1\n</div>",
                        'tags-edit-success' );
                $this->wasSaved = true;
                $this->revList->reloadFromMaster();
                $this->reason = ''; // no need to spew the reason back at the user
                $this->showForm();
        }

        /**
         * Report that the submit operation failed
         * @param Status $status
         */
        protected function failure( $status ) {
                $this->getOutput()->setPageTitle( $this->msg( 'actionfailed' ) );
                $this->getOutput()->addWikiText( '<div class="errorbox">' .
                        $status->getWikiText( 'tags-edit-failure' ) .
                        '</div>'
                );
                $this->showForm();
        }

        public function getDescription() {
                return $this->msg( 'tags-edit-title' )->text();
        }

        protected function getGroupName() {
                return 'pagetools';
        }
}