--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/includes/pageprocess.php Wed Jun 13 16:07:17 2007 -0400
@@ -0,0 +1,457 @@
+<?php
+/*
+ * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
+ * Version 1.0 (Banshee)
+ * pageprocess.php - intelligent retrieval of pages
+ * Copyright (C) 2006-2007 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.
+ */
+
+/**
+ * Class to handle fetching page text (possibly from a cache) and formatting it.
+ * @package Enano
+ * @subpackage UI
+ * @copyright 2007 Dan Fuhry
+ * @license GNU General Public License <http://www.gnu.org/licenses/gpl.html>
+ */
+
+class PageProcessor
+{
+
+ /**
+ * Page ID and namespace of the page handled by this instance
+ * @var string
+ */
+
+ var $page_id;
+ var $namespace;
+
+ /**
+ * Tracks if the page we're loading exists in the database or not.
+ * @var bool
+ */
+
+ var $page_exists = false;
+
+ /**
+ * Permissions!
+ * @var object
+ */
+
+ var $perms = null;
+
+ /**
+ * Switch to track if redirects are allowed. Defaults to true.
+ * @var bool
+ */
+
+ var $allow_redir = true;
+
+ /**
+ * If this is set to true, this will call the header and footer funcs on $template when render() is called.
+ * @var bool
+ */
+
+ var $send_headers = false;
+
+ /**
+ * Cache the fetched text so we don't fetch it from the DB twice.
+ * @var string
+ */
+
+ var $text_cache = '';
+
+ /**
+ * Debugging information to track errors. You can set enable to false to disable sending debug information.
+ * @var array
+ */
+
+ var $debug = array(
+ 'enable' => true,
+ 'works' => false
+ );
+
+ /**
+ * Constructor.
+ * @param string The page ID (urlname) of the page
+ * @param string The namespace of the page
+ */
+
+ function __construct( $page_id, $namespace )
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+
+ // See if we can get some debug info
+ if ( function_exists('debug_backtrace') && $this->debug['enable'] )
+ {
+ $this->debug['works'] = true;
+ $this->debug['backtrace'] = enano_debug_print_backtrace(true);
+ }
+
+ // First things first - check page existence and permissions
+
+ if ( !isset($paths->nslist[$namespace]) )
+ {
+ $this->send_error('The namespace "' . htmlspecialchars($namespace) . '" does not exist.');
+ }
+
+ $this->_setup( $page_id, $namespace );
+
+ }
+
+ /**
+ * The main method to send the page content. Also responsible for checking permissions.
+ */
+
+ function send()
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+ if ( !$this->perms->get_permissions('read') )
+ {
+ $this->err_access_denied();
+ return false;
+ }
+ if ( $this->namespace == 'Special' || $this->namespace == 'Admin' )
+ {
+ if ( !$this->page_exists )
+ {
+ redirect( makeUrl(getConfig('main_page')), 'Can\'t find special page', 'The special or administration page you requested does not exist. You will now be transferred to the main page.', 2 );
+ }
+ $func_name = "page_{$this->namespace}_{$this->page_id}";
+ if ( function_exists($func_name) )
+ {
+ return @call_user_func($func_name);
+ }
+ else
+ {
+ $title = 'Page backend not found';
+ $message = "The administration page you are looking for was properly registered using the page API, but the backend function
+ (<tt>$fname</tt>) was not found. If this is a plugin page, then this is almost certainly a bug with the plugin.";
+
+ if ( $this->send_headers )
+ {
+ $template->tpl_strings['PAGE_NAME'] = $title;
+ $template->header();
+ echo "<p>$message</p>";
+ $template->footer();
+ }
+ else
+ {
+ echo "<h2>$title</h2>
+ <p>$message</p>";
+ }
+ return false;
+ }
+ }
+ else if ( in_array($this->namespace, array('Article', 'User', 'Project', 'Help', 'File', 'Category')) && $this->page_exists )
+ {
+ // Send as regular page
+ $text = $this->fetch_text();
+ if ( $text == 'err_no_text_rows' )
+ {
+ $this->err_no_rows();
+ return false;
+ }
+ else
+ {
+ $this->render();
+ }
+ }
+ else if ( ( $this->namespace == 'Template' || $this->namespace == 'System' ) && $this->page_exists )
+ {
+ $this->header();
+
+ $text = $this->fetch_text();
+ $text = preg_replace('/<noinclude>(.*?)<\/noinclude>/is', '\\1', $text);
+ $text = preg_replace('/<nodisplay>(.*?)<\/nodisplay>/is', '', $text);
+
+ $text = RenderMan::render( $text );
+
+ echo $text;
+
+ $this->footer();
+
+ }
+ else if ( !$this->page_exists )
+ {
+ // Perhaps this is hooked?
+ ob_start();
+
+ $code = $plugins->setHook('page_not_found');
+ foreach ( $code as $cmd )
+ {
+ eval($cmd);
+ }
+
+ $ob = ob_get_contents();
+
+ if ( empty($ob) )
+ {
+ $this->err_page_not_existent();
+ }
+
+ }
+
+ }
+
+ /**
+ * Sets internal variables.
+ * @access private
+ */
+
+ function _setup($page_id, $namespace)
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+
+ $page_id_cleaned = sanitize_page_id($page_id);
+
+ $this->page_id = $page_id_cleaned;
+ $this->namespace = $namespace;
+
+ $this->perms = $session->fetch_page_acl( $page_id, $namespace );
+
+ // Exception for Admin: pages
+ if ( $this->namespace == 'Admin' )
+ {
+ $fname = "page_Admin_{$this->page_id}";
+ }
+
+ // Does the page "exist"?
+ if ( $paths->cpage['urlname_nons'] == $page_id && $paths->namespace == $namespace && !$paths->page_exists && ( $this->namespace == 'Admin' && !function_exists($fname) ) )
+ {
+ $this->page_exists = false;
+ }
+ else if ( !isset( $paths->pages[ $paths->nslist[$namespace] . $page_id ] ) && ( $this->namespace == 'Admin' && !function_exists($fname) ) )
+ {
+ $this->page_exists = false;
+ }
+ else
+ {
+ $this->page_exists = true;
+ }
+ }
+
+ /**
+ * Renders it all in one go, and echoes it out. This assumes that the text is in the DB.
+ * @access private
+ */
+
+ function render()
+ {
+ $text = $this->fetch_text();
+
+ $this->header();
+ display_page_headers();
+ echo RenderMan::render($text);
+ display_page_footers();
+ $this->footer();
+ }
+
+ /**
+ * Sends the page header, dependent on, of course, whether we're supposed to.
+ */
+
+ function header()
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+ if ( $this->send_headers )
+ $template->header();
+ }
+
+ /**
+ * Sends the page footer, dependent on, of course, whether we're supposed to.
+ */
+
+ function footer()
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+ if ( $this->send_headers )
+ $template->footer();
+ }
+
+ /**
+ * Fetches the raw, unfiltered page text.
+ * @access public
+ */
+
+ function fetch_text()
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+
+ if ( !empty($this->text_cache) )
+ {
+ return $this->text_cache;
+ }
+
+ $q = $db->sql_query('SELECT page_text, char_tag FROM '.table_prefix.'page_text WHERE page_id=\'' . $this->page_id . '\' AND namespace=\'' . $this->namespace . '\';');
+ if ( !$q )
+ {
+ $this->send_error('Error during SQL query.', true);
+ }
+ if ( $db->numrows() < 1 )
+ {
+ $this->page_exists = false;
+ return 'err_no_text_rows';
+ }
+
+ $row = $db->fetchrow();
+ $db->free_result();
+
+ if ( !empty($row['char_tag']) )
+ {
+ // This page text entry uses the old text-escaping format
+ $from = array(
+ "{APOS:{$row['char_tag']}}",
+ "{QUOT:{$row['char_tag']}}",
+ "{SLASH:{$row['char_tag']}}"
+ );
+ $to = array("'", '"', '\\');
+ $row['page_text'] = str_replace($from, $to, $row['page_text']);
+ }
+
+ $this->text_cache = $row['page_text'];
+
+ return $row['page_text'];
+
+ }
+
+ /**
+ * Send the error message to the user that the access to this page is denied.
+ * @access private
+ */
+
+ function err_access_denied()
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+
+ $ob = '';
+ $template->tpl_strings['PAGE_NAME'] = 'Access denied';
+
+ if ( $this->send_headers )
+ {
+ $ob .= $template->getHeader();
+ }
+
+ $ob .= '<div class="error-box"><b>Access to this page is denied.</b><br />This may be because you are not logged in or you have not met certain criteria for viewing this page.</div>';
+
+ if ( $this->send_headers )
+ {
+ $ob .= $template->getFooter();
+ }
+ echo $ob;
+ }
+
+ /**
+ * Send the error message to the user complaining that there weren't any rows.
+ * @access private
+ */
+
+ function err_no_rows()
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+
+ $title = 'No text rows';
+ $message = 'While the page\'s existence was verified, there were no rows in the database that matched the query for the text. This may indicate a bug with the software; ask the webmaster for more information. The offending query was:<pre>' . $db->latest_query . '</pre>';
+ if ( $this->send_headers )
+ {
+ $template->tpl_strings['PAGE_NAME'] = $title;
+ $template->header();
+ echo "<p>$message</p>";
+ $template->footer();
+ }
+ else
+ {
+ echo "<h2>$title</h2>
+ <p>$message</p>";
+ }
+ }
+
+ /**
+ * Tell the user the page doesn't exist, and present them with their options.
+ * @access private
+ */
+
+ function err_page_not_existent()
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+
+ $this->header();
+ header('HTTP/1.1 404 Not Found');
+ echo '<h3>There is no page with this title yet.</h3>
+ <p>You have requested a page that doesn\'t exist yet.';
+ if ( $session->get_permissions('create_page') )
+ {
+ echo ' You can <a href="'.makeUrlNS($this->namespace, $this->page_id, 'do=edit', true).'" onclick="ajaxEditor(); return false;">create this page</a>, or return to the <a href="'.makeUrl(getConfig('main_page')).'">homepage</a>.';
+ }
+ else
+ {
+ echo ' Return to the <a href="'.makeUrl(getConfig('main_page')).'">homepage</a>.</p>';
+ }
+ if ( $session->get_permissions('history_rollback') )
+ {
+ $e = $db->sql_query('SELECT * FROM ' . table_prefix . 'logs WHERE action=\'delete\' AND page_id=\'' . $this->page_id . '\' AND namespace=\'' . $this->namespace . '\' ORDER BY time_id DESC;');
+ if ( !$e )
+ {
+ $db->_die('The deletion log could not be selected.');
+ }
+ if ( $db->numrows() > 0 )
+ {
+ $r = $db->fetchrow();
+ echo '<p>This page also appears to have some log entries in the database - it seems that it was deleted on ' . $r['date_string'] . '. You can probably <a href="'.makeUrl($paths->page, 'do=rollback&id='.$r['time_id']).'" onclick="ajaxRollback(\''.$r['time_id'].'\'); return false;">roll back</a> the deletion.</p>';
+ }
+ $db->free_result();
+ }
+ echo '<p>
+ HTTP Error: 404 Not Found
+ </p>';
+ $this->footer();
+ }
+
+ /**
+ * PHP 4 constructor.
+ * @see PageProcessor::__construct()
+ */
+
+ function PageProcessor( $page_id, $namespace )
+ {
+ $this->__construct($page_id, $namespace);
+ }
+
+ /**
+ * Send an error message and die
+ * @var string Error message
+ * @var bool If true, send DBAL's debugging information as well
+ */
+
+ function send_error($message, $sql = false)
+ {
+ global $db, $session, $paths, $template, $plugins; // Common objects
+
+ $content = "<p>$message</p>";
+ $template->tpl_strings['PAGE_NAME'] = 'General error in page fetcher';
+
+ if ( $this->debug['works'] )
+ {
+ $content .= $this->debug['backtrace'];
+ }
+
+ header('HTTP/1.1 500 Internal Server Error');
+
+ $template->header();
+ echo $content;
+ $template->footer();
+
+ $db->close();
+
+ exit;
+
+ }
+
+} // class PageProcessor
+
+?>