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<?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 Installer
 */
class WebInstallerUpgrade extends WebInstallerPage {
    /**
     * @return bool Always true.
     */
    public function isSlow() {
        return true;
    }
    /**
     * @return string|null
     */
    public function execute() {
        if ( $this->getVar( '_UpgradeDone' ) ) {
            // Allow regeneration of LocalSettings.php, unless we are working
            // from a pre-existing LocalSettings.php file and we want to avoid
            // leaking its contents
            if ( $this->parent->request->wasPosted() && !$this->getVar( '_ExistingDBSettings' ) ) {
                // Done message acknowledged
                return 'continue';
            }
            // Back button click
            // Show the done message again
            // Make them click back again if they want to do the upgrade again
            $this->showDoneMessage();
            return 'output';
        }
        // wgDBtype is generally valid here because otherwise the previous page
        // (connect) wouldn't have declared its happiness
        $type = $this->getVar( 'wgDBtype' );
        $installer = $this->parent->getDBInstaller( $type );
        if ( !$installer->needsUpgrade() ) {
            return 'skip';
        }
        if ( $this->parent->request->wasPosted() ) {
            $installer->preUpgrade();
            $this->startLiveBox();
            $result = $installer->doUpgrade();
            $this->endLiveBox();
            if ( $result ) {
                // If they're going to possibly regenerate LocalSettings, we
                // need to create the upgrade/secret keys. T28481
                if ( !$this->getVar( '_ExistingDBSettings' ) ) {
                    $this->parent->generateKeys();
                }
                $this->setVar( '_UpgradeDone', true );
                $this->showDoneMessage();
            } else {
                $this->startForm();
                $this->parent->showError( 'config-upgrade-error' );
                $this->endForm();
            }
            return 'output';
        }
        $this->startForm();
        $this->addHTML( $this->parent->getInfoBox(
            wfMessage( 'config-can-upgrade', MW_VERSION )->plain() ) );
        $this->endForm();
        return null;
    }
    public function showDoneMessage() {
        $this->startForm();
        $regenerate = !$this->getVar( '_ExistingDBSettings' );
        if ( $regenerate ) {
            $msg = 'config-upgrade-done';
        } else {
            $msg = 'config-upgrade-done-no-regenerate';
        }
        $this->parent->disableLinkPopups();
        $this->addHTML(
            $this->parent->getInfoBox(
                wfMessage( $msg,
                    $this->getVar( 'wgServer' ) .
                    $this->getVar( 'wgScriptPath' ) . '/index.php'
                )->plain(), 'tick-32.png'
            )
        );
        $this->parent->restoreLinkPopups();
        $this->endForm( $regenerate ? 'regenerate' : false, false );
    }
}