<?php
/**
 * StatusNet - the distributed open-source microblogging tool
 * Copyright (C) 2010, StatusNet, Inc.
 *
 * Import del.icio.us bookmarks backups
 *
 * PHP version 5
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @category  Bookmark
 * @package   StatusNet
 * @author    Evan Prodromou <evan@status.net>
 * @copyright 2010 StatusNet, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
 * @link      http://status.net/
 */

if (!defined('STATUSNET')) {
    // This check helps protect against security problems;
    // your code file can't be executed directly from the web.
    exit(1);
}

/**
 * UI for importing del.icio.us bookmark backups
 *
 * @category  Bookmark
 * @package   StatusNet
 * @author    Evan Prodromou <evan@status.net>
 * @copyright 2010 StatusNet, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
 * @link      http://status.net/
 */
class ImportdeliciousAction extends Action
{
    protected $success = false;
    private $inprogress = false;

    /**
     * Return the title of the page
     *
     * @return string page title
     */
    function title()
    {
        // TRANS: Title for page to import del.icio.us bookmark backups on.
        return _m("Import del.icio.us bookmarks");
    }

    /**
     * For initializing members of the class.
     *
     * @param array $args misc. arguments
     *
     * @return boolean true
     * @throws ClientException
     */
    function prepare(array $args = [])
    {
        parent::prepare($args);

        $cur = common_current_user();

        if (empty($cur)) {
            // TRANS: Client exception thrown when trying to import bookmarks without being logged in.
            throw new ClientException(_m('Only logged-in users can ' .
                'import del.icio.us backups.'),
                403);
        }

        if (!$cur->hasRight(BookmarkPlugin::IMPORTDELICIOUS)) {
            // TRANS: Client exception thrown when trying to import bookmarks without having the rights to do so.
            throw new ClientException(_m('You may not restore your account.'), 403);
        }

        return true;
    }

    /**
     * Handler method
     *
     * @return void
     * @throws ClientException
     */
    function handle()
    {
        parent::handle();

        if ($this->isPost()) {
            $this->importDelicious();
        } else {
            $this->showPage();
        }
        return;
    }

    /**
     * Queue a file for importation
     *
     * Uses the DeliciousBackupImporter class; may take a long time!
     *
     * @return void
     * @throws ClientException
     */
    function importDelicious()
    {
        $this->checkSessionToken();

        if (!isset($_FILES[ImportDeliciousForm::FILEINPUT]['error'])) {
            // TRANS: Client exception thrown when trying to import bookmarks and upload fails.
            throw new ClientException(_m('No uploaded file.'));
        }

        switch ($_FILES[ImportDeliciousForm::FILEINPUT]['error']) {
            case UPLOAD_ERR_OK: // success, jump out
                break;
            case UPLOAD_ERR_INI_SIZE:
                // TRANS: Client exception thrown when an uploaded file is too large.
                throw new ClientException(_m('The uploaded file exceeds the ' .
                    'upload_max_filesize directive in php.ini.'));
            case UPLOAD_ERR_FORM_SIZE:
                throw new ClientException(
                // TRANS: Client exception thrown when an uploaded file is too large.
                    _m('The uploaded file exceeds the MAX_FILE_SIZE directive' .
                        ' that was specified in the HTML form.'));
            case UPLOAD_ERR_PARTIAL:
                @unlink($_FILES[ImportDeliciousForm::FILEINPUT]['tmp_name']);
                // TRANS: Client exception thrown when a file was only partially uploaded.
                throw new ClientException(_m('The uploaded file was only' .
                    ' partially uploaded.'));
            case UPLOAD_ERR_NO_FILE:
                // No file; probably just a non-AJAX submission.
                // TRANS: Client exception thrown when a file upload has failed.
                throw new ClientException(_m('No uploaded file.'));
            case UPLOAD_ERR_NO_TMP_DIR:
                // TRANS: Client exception thrown when a temporary folder is not present.
                throw new ClientException(_m('Missing a temporary folder.'));
            case UPLOAD_ERR_CANT_WRITE:
                // TRANS: Client exception thrown when writing to disk is not possible.
                throw new ClientException(_m('Failed to write file to disk.'));
            case UPLOAD_ERR_EXTENSION:
                // TRANS: Client exception thrown when a file upload has been stopped.
                throw new ClientException(_m('File upload stopped by extension.'));
            default:
                common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " .
                    $_FILES[ImportDeliciousForm::FILEINPUT]['error']);
                // TRANS: Client exception thrown when a file upload operation has failed.
                throw new ClientException(_m('System error uploading file.'));
        }

        $filename = $_FILES[ImportDeliciousForm::FILEINPUT]['tmp_name'];

        try {
            if (!file_exists($filename)) {
                // TRANS: Server exception thrown when a file upload cannot be found.
                // TRANS: %s is the file that could not be found.
                throw new ServerException(sprintf(_m('No such file "%s".'), $filename));
            }

            if (!is_file($filename)) {
                // TRANS: Server exception thrown when a file upload is incorrect.
                // TRANS: %s is the irregular file.
                throw new ServerException(sprintf(_m('Not a regular file: "%s".'), $filename));
            }

            if (!is_readable($filename)) {
                // TRANS: Server exception thrown when a file upload is not readable.
                // TRANS: %s is the file that could not be read.
                throw new ServerException(sprintf(_m('File "%s" not readable.'), $filename));
            }

            common_debug(sprintf("Getting backup from file '%s'.", $filename));

            $html = file_get_contents($filename);

            // Enqueue for processing.

            $qm = QueueManager::get();
            $qm->enqueue([common_current_user(), $html], 'dlcsback');

            if ($qm instanceof UnQueueManager) {
                // No active queuing means we've actually just completed the job!
                $this->success = true;
            } else {
                // We've fed data into background queues, and it's probably still running.
                $this->inprogress = true;
            }

            $this->showPage();

        } catch (Exception $e) {
            // Delete the file and re-throw
            @unlink($_FILES[ImportDeliciousForm::FILEINPUT]['tmp_name']);
            throw $e;
        }
    }

    /**
     * Show the content of the page
     *
     * @return void
     */
    function showContent()
    {
        if ($this->success) {
            $this->element('p', null,
                // TRANS: Success message after importing bookmarks.
                _m('Bookmarks have been imported. Your bookmarks should now appear in search and your profile page.'));
        } else if ($this->inprogress) {
            $this->element('p', null,
                // TRANS: Busy message for importing bookmarks.
                _m('Bookmarks are being imported. Please wait a few minutes for results.'));
        } else {
            $form = new ImportDeliciousForm($this);
            $form->show();
        }
    }

    /**
     * Return true if read only.
     *
     * MAY override
     *
     * @param array $args other arguments
     *
     * @return boolean is read only action?
     */
    function isReadOnly($args)
    {
        return !$this->isPost();
    }
}

/**
 * A form for backing up the account.
 *
 * @category  Account
 * @package   StatusNet
 * @author    Evan Prodromou <evan@status.net>
 * @copyright 2010 StatusNet, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
 * @link      http://status.net/
 */
class ImportDeliciousForm extends Form
{
    const FILEINPUT = 'deliciousbackupfile';

    /**
     * Constructor
     *
     * Set the encoding type, since this is a file upload.
     *
     * @param HTMLOutputter $out output channel
     *
     */
    function __construct($out = null)
    {
        parent::__construct($out);
        $this->enctype = 'multipart/form-data';
    }

    /**
     * Class of the form.
     *
     * @return string the form's class
     */
    function formClass()
    {
        return 'form_import_delicious';
    }

    /**
     * URL the form posts to
     *
     * @return string the form's action URL
     */
    function action()
    {
        return common_local_url('importdelicious');
    }

    /**
     * Output form data
     *
     * Really, just instructions for doing a backup.
     *
     * @return void
     */
    function formData()
    {
        $this->out->elementStart('p', 'instructions');

        // TRANS: Form instructions for importing bookmarks.
        $this->out->raw(_m('You can upload a backed-up ' .
            'delicious.com bookmarks file.'));

        $this->out->elementEnd('p');

        $this->out->elementStart('ul', 'form_data');

        $this->out->elementStart('li', array('id' => 'settings_attach'));
        $this->out->element('input', array('name' => self::FILEINPUT,
            'type' => 'file',
            'id' => self::FILEINPUT));
        $this->out->elementEnd('li');

        $this->out->elementEnd('ul');
    }

    /**
     * Buttons for the form
     *
     * In this case, a single submit button
     *
     * @return void
     */

    function formActions()
    {
        $this->out->submit('submit',
            // TRANS: Button text on form to import bookmarks.
            _m('BUTTON', 'Upload'),
            'submit',
            null,
            // TRANS: Button title on form to import bookmarks.
            _m('Upload the file.'));
    }
}
