<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Copyright (C) 2006-2009 Dan Fuhry

 *

 * This program is Free Software; you can redistribute 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 details.

 */

define('ENANO_INTERFACE_AJAX', '');

require('includes/common.php');

global $db, $session, $paths, $template, $plugins; // Common objects

if(!isset($_GET['_mode'])) die('This script cannot be accessed directly.');

$_ob = '';

switch($_GET['_mode']) {

	case "checkusername":

		require_once(ENANO_ROOT.'/includes/pageutils.php');

		echo PageUtils::checkusername($_GET['name']);

		break;

	case "getsource":

		header('Content-type: text/plain');

		$password = ( isset($_GET['pagepass']) ) ? $_GET['pagepass'] : false;

		$revid = ( isset($_GET['revid']) ) ? intval($_GET['revid']) : 0;

		$page = new PageProcessor($paths->page_id, $paths->namespace, $revid);

		$page->password = $password;

		$have_draft = false;

		// Kinda hacky fix for issue 7: draft restore not offered for nonexistent pages

		if ( ($src = $page->fetch_source()) || !$page->exists() )

		{

			$allowed = true;

			$q = $db->sql_query('SELECT author, time_id, page_text, edit_summary, page_format FROM ' . table_prefix . 'logs WHERE log_type = \'page\' AND action = \'edit\'

														AND page_id = \'' . $db->escape($paths->page_id) . '\'

														AND namespace = \'' . $db->escape($paths->namespace) . '\'

														AND is_draft = 1;');

			if ( !$q )

				$db->die_json();

			if ( $db->numrows() > 0 )

			{

				$have_draft = true;

				$draft_row = $db->fetchrow($q);

			}

		}

		else if ( $src !== false )

		{

			$allowed = true;

			$src = '';

		}

		else

		{

			$allowed = false;

			$src = '';

		}

		$auth_edit = ( $session->get_permissions('edit_page') && ( $session->get_permissions('even_when_protected') || !$page->ns->page_protected ) );

		$auth_wysiwyg = ( $session->get_permissions('edit_wysiwyg') );

		$return = array(

				'mode' => 'editor',

				'src' => $src,

				'auth_view_source' => $allowed,

				'auth_edit' => $auth_edit,

				'time' => time(),

				'require_captcha' => false,

				'allow_wysiwyg' => $auth_wysiwyg,

				'revid' => $revid,

				'have_draft' => false

			);

		$return['page_format'] = $page->ns->cdata['page_format'];

		if ( $return['page_format'] == 'xhtml' )

		{

			// gently process headings to make tinymce format them correctly

			if ( preg_match_all('/^ *?(={1,6}) *(.+?) *\\1 *$/m', $return['src'], $matches) )

			{

				foreach ( $matches[0] as $i => $match )

				{

					$hi = strlen($matches[1][$i]);

					$heading = "<h{$hi}>{$matches[2][$i]}</h{$hi}>";

					$return['src'] = str_replace_once($match, $heading, $return['src']);

				}

			}

		}

		if ( $have_draft )

		{

			$row =& $draft_row;

			$return['have_draft'] = true;

			$return['draft_author'] = $row['author'];

			$return['draft_time'] = enano_date(ED_DATE | ED_TIME, intval($row['time_id']));

			if ( isset($_GET['get_draft']) && @$_GET['get_draft'] === '1' )

			{

				$return['src'] = $row['page_text'];

				$return['edit_summary'] = $row['edit_summary'];

				$return['page_format'] = $row['page_format'];

			}

		}

		$return['undo_info'] = array();

		if ( $revid > 0 )

		{

			// Retrieve information about this revision and the current one

			$q = $db->sql_query('SELECT l1.author AS currentrev_author, l2.author AS oldrev_author FROM ' . table_prefix . 'logs AS l1

LEFT JOIN ' . table_prefix . 'logs AS l2

	ON ( l2.log_id = ' . $revid . '

			AND l2.log_type  = \'page\'

			AND l2.action    = \'edit\'

			AND l2.page_id   = \'' . $db->escape($paths->page_id)   . '\'

			AND l2.namespace = \'' . $db->escape($paths->namespace) . '\'

			AND l2.is_draft != 1

			)

WHERE l1.log_type  = \'page\'

	AND l1.action    = \'edit\'

	AND l1.page_id   = \'' . $db->escape($paths->page_id)   . '\'

	AND l1.namespace = \'' . $db->escape($paths->namespace) . '\'

	AND l1.time_id   > ' . $page->revision_time . '

	AND l1.is_draft != 1

ORDER BY l1.time_id DESC;');

			if ( !$q )

				$db->die_json();

			if ( $db->numrows() > 0 )

			{

				$rev_count = $db->numrows() - 1;

				if ( $rev_count == -1 )

				{

					$return = array(

							'mode' => 'error',

							'error' => '[Internal] No rows returned by revision info query. SQL:<pre>' . $db->latest_query . '</pre>'

						);

				}

				else

				{

					$row = $db->fetchrow();

					$return['undo_info'] = array(

						'old_author'     => $row['oldrev_author'],

						'current_author' => $row['currentrev_author'],

						'undo_count'     => $rev_count

					);

				}

			}

			else

			{

				$return['revid'] = $revid = 0;

			}

		}

		if ( $auth_edit && !$session->user_logged_in && getConfig('guest_edit_require_captcha') == '1' )

		{

			$return['require_captcha'] = true;

			$return['captcha_id'] = $session->make_captcha();

		}

		$template->load_theme();

		$return['toolbar_templates'] = $template->extract_vars('toolbar.tpl');

		$return['edit_notice'] = $template->get_wiki_edit_notice();

		echo enano_json_encode($return);

		break;

	case "getpage":

		// echo PageUtils::getpage($paths->page, false, ( (isset($_GET['oldid'])) ? $_GET['oldid'] : false ));

		$output = new Output_Striptease();

		$revision_id = ( (isset($_GET['oldid'])) ? intval($_GET['oldid']) : 0 );

		$page = new PageProcessor( $paths->page_id, $paths->namespace, $revision_id );

		$template->set_page($page);

		$pagepass = ( isset($_REQUEST['pagepass']) ) ? $_REQUEST['pagepass'] : '';

		$page->password = $pagepass;

		$page->allow_redir = ( !isset($_GET['redirect']) || (isset($_GET['redirect']) && $_GET['redirect'] !== 'no') );

		$page->send();

		break;

	case "savepage":

		/* **** OBSOLETE **** */

		break;

	case "savepage_json":

		header('Content-type: application/json');

		if ( !isset($_POST['r']) )

			die('Invalid request');

		try

		{

			$request = enano_json_decode($_POST['r']);

			if ( !isset($request['src']) || !isset($request['summary']) || !isset($request['minor_edit']) || !isset($request['time']) || !isset($request['draft']) )

				die('Invalid request');

		}

		catch(Zend_Json_Exception $e)

		{

			die("JSON parsing failed. View as HTML to see full report.\n<br /><br />\n<pre>" . htmlspecialchars(strval($e)) . "</pre><br />Request: <pre>" . htmlspecialchars($_POST['r']) . "</pre>");

		}

		$time = intval($request['time']);

		if ( $request['draft'] )

		{

			//

			// The user wants to save a draft version of the page.

			//

			// Validate permissions

			if ( !$session->get_permissions('edit_page') )

			{

				$return = array(

					'mode' => 'error',

					'error' => 'access_denied'

				);

			}

			else

			{

				// Delete any draft copies if they exist

				$q = $db->sql_query('DELETE FROM ' . table_prefix . 'logs WHERE log_type = \'page\' AND action = \'edit\'

															AND page_id = \'' . $db->escape($paths->page_id) . '\'

															AND namespace = \'' . $db->escape($paths->namespace) . '\'

															AND is_draft = 1;');

				if ( !$q )

					$db->die_json();

				// are we just supposed to delete the draft?

				if ( $request['src'] === -1 )

				{

					$return = array(

						'mode' => 'success',

						'is_draft' => 'delete'

					);

				}

				else

				{

					$src = RenderMan::preprocess_text($request['src'], false, false);

					$draft_format = $request['format'];

					if ( !in_array($draft_format, array('xhtml', 'wikitext')) )

					{

						$return = array(

							'mode' => 'error',

							'error' => 'invalid_format'

						);

					}

					else

					{

						// Save the draft

						$q = $db->sql_query('INSERT INTO ' . table_prefix . 'logs ( log_type, action, page_id, namespace, author, author_uid, edit_summary, page_text, is_draft, time_id, page_format )

												VALUES (

													\'page\',

													\'edit\',

													\'' . $db->escape($paths->page_id) . '\',

													\'' . $db->escape($paths->namespace) . '\',

													\'' . $db->escape($session->username) . '\',

													' . $session->user_id . ',

													\'' . $db->escape($request['summary']) . '\',

													\'' . $db->escape($src) . '\',

													1,

													' . time() . ',

													\'' . $draft_format . '\'

												);');

						// Done!

						$return = array(

								'mode' => 'success',

								'is_draft' => true

							);

					}

				}

			}

		}

		else

		{

			// Verify that no edits have been made since the editor was requested

			$q = $db->sql_query('SELECT time_id, author FROM ' . table_prefix . "logs WHERE log_type = 'page' AND action = 'edit' AND page_id = '{$paths->page_id}' AND namespace = '{$paths->namespace}' AND is_draft != 1 ORDER BY time_id DESC LIMIT 1;");

			if ( !$q )

				$db->die_json();

			$row = $db->fetchrow();

			$db->free_result();

			if ( $row['time_id'] > $time )

			{

				$return = array(

					'mode' => 'obsolete',

					'author' => $row['author'],

					'date_string' => enano_date(ED_DATE | ED_TIME, $row['time_id']),

					'time' => $row['time_id'] // time() ???

					);

				echo enano_json_encode($return);

				break;

			}

			// Verify captcha, if needed

			if ( false && !$session->user_logged_in && getConfig('guest_edit_require_captcha') == '1' )

			{

				if ( !isset($request['captcha_id']) || !isset($request['captcha_code']) )

				{

					die('Invalid request, need captcha metadata');

				}

				$code_correct = strtolower($session->get_captcha($request['captcha_id']));

				$code_input = strtolower($request['captcha_code']);

				if ( $code_correct !== $code_input )

				{

					$return = array(

						'mode' => 'errors',

						'errors' => array($lang->get('editor_err_captcha_wrong')),

						'new_captcha' => $session->make_captcha()

					);

					echo enano_json_encode($return);

					break;

				}

			}

			// Verification complete. Start the PageProcessor and let it do the dirty work for us.

			$page = new PageProcessor($paths->page_id, $paths->namespace);

			if ( $page->update_page($request['src'], $request['summary'], ( $request['minor_edit'] == 1 ), $request['format']) )

			{

				$return = array(

						'mode' => 'success',

						'is_draft' => false

					);

			}

			else

			{

				$errors = array();

				while ( $err = $page->pop_error() )

				{

					$errors[] = $err;

				}

				$return = array(

					'mode' => 'errors',

					'errors' => array_values($errors)

					);

				if ( !$session->user_logged_in && getConfig('guest_edit_require_captcha') == '1' )

				{

					$return['new_captcha'] = $session->make_captcha();

				}

			}

		}

		// If this is based on a draft version, delete the draft - we no longer need it.

		if ( @$request['used_draft'] && !$request['draft'] )

		{

			$q = $db->sql_query('DELETE FROM ' . table_prefix . 'logs WHERE log_type = \'page\' AND action = \'edit\'

														AND page_id = \'' . $db->escape($paths->page_id) . '\'

														AND namespace = \'' . $db->escape($paths->namespace) . '\'

														AND is_draft = 1;');

		}

		echo enano_json_encode($return);

		break;

	case "diff_cur":

		// Lie about our content type to fool ad scripts

		header('Content-type: application/xhtml+xml');

		if ( !isset($_POST['text']) )

			die('Invalid request');

		$page = new PageProcessor($paths->page_id, $paths->namespace);

		if ( !($src = $page->fetch_source()) )

		{

			die('Access denied');

		}

		$diff = RenderMan::diff($src, $_POST['text']);

		if ( $diff == '<table class="diff"></table>' )

		{

			$diff = '<p>' . $lang->get('editor_msg_diff_empty') . '</p>';

		}

		echo '<div class="info-box">' . $lang->get('editor_msg_diff') . '</div>';

		echo $diff;

		break;

	case "protect":

		// echo PageUtils::protect($paths->page_id, $paths->namespace, (int)$_POST['level'], $_POST['reason']);

		if ( @$_POST['reason'] === '__ROLLBACK__' )

		{

			// __ROLLBACK__ is a keyword for log entries.

			die('"__ROLLBACK__" ain\'t gonna do it, buddy. Try to _not_ use reserved keywords next time, ok?');

		}

		$page = new PageProcessor($paths->page_id, $paths->namespace);

		header('Content-type: application/json');

		$result = $page->protect_page(intval($_POST['level']), $_POST['reason']);

		echo enano_json_encode($result);

		break;