action = $settings->defaultaction;
$env->page = "";
$env->user = "Anonymous";
$env->is_logged_in = false;
$env->is_admin = false;
$env->storage_prefix = $settings->data_storage_dir . DIRECTORY_SEPARATOR;
/// Paths ///
$paths = new stdClass();
$paths->pageindex = "pageindex.json"; // The pageindex
$paths->searchindex = "invindex.json"; // The inverted index used for searching
$paths->idindex = "idindex.json"; // The index that converts ids to page names
// Prepend the storage data directory to all the defined paths.
foreach ($paths as &$path) {
$path = $env->storage_prefix . $path;
}
$paths->upload_file_prefix = "Files/"; // The prefix to append to uploaded files
session_start();
///////// Login System /////////
// Clear expired sessions
if(isset($_SESSION["$settings->sessionprefix-expiretime"]) and
$_SESSION["$settings->sessionprefix-expiretime"] < time())
{
// Clear the session variables
$_SESSION = [];
session_destroy();
$env->is_logged_in = false;
$env->user = "Anonymous";
}
if(!isset($_SESSION[$settings->sessionprefix . "-user"]) and
!isset($_SESSION[$settings->sessionprefix . "-pass"]))
{
// The user is not logged in
$env->is_logged_in = false;
}
else
{
$env->user = $_SESSION[$settings->sessionprefix . "-user"];
$env->pass = $_SESSION[$settings->sessionprefix . "-pass"];
if($settings->users[$env->user] == $env->pass)
{
// The user is logged in
$env->is_logged_in = true;
}
else
{
// The user's login details are invalid (what is going on here?)
// Unset the session variables, treat them as an anonymous user,
// and get out of here
$env->is_logged_in = false;
$env->user = "Anonymous";
$env->pass = "";
// Clear the session data
$_SESSION = []; //delete all the variables
session_destroy(); //destroy the session
}
}
//check to see if the currently logged in user is an admin
$env->is_admin = false;
if($env->is_logged_in)
{
foreach($settings->admins as $admin_username)
{
if($admin_username == $env->user)
{
$env->is_admin = true;
break;
}
}
}
/////// Login System End ///////
///////////////////////////////////////////////////////////////////////////////
////////////////////////////////// Functions //////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
/**
* Converts a filesize into a human-readable string.
* From http://php.net/manual/en/function.filesize.php#106569
* Edited by Starbeamrainbowlabs.
* @param number $bytes The number of bytes to convert.
* @param number $decimals The number of decimal places to preserve.
* @return string A human-readable filesize.
*/
function human_filesize($bytes, $decimals = 2)
{
$sz = ["b", "kb", "mb", "gb", "tb", "pb", "eb", "yb", "zb"];
$factor = floor((strlen($bytes) - 1) / 3);
$result = round($bytes / pow(1024, $factor), $decimals);
return $result . @$sz[$factor];
}
/**
* Calculates the time since a particular timestamp and returns a
* human-readable result.
* From http://goo.gl/zpgLgq.
* @param integer $time The timestamp to convert.
* @return string The time since the given timestamp as
* a human-readable string.
*/
function human_time_since($time)
{
$timediff = time() - $time;
$tokens = array (
31536000 => 'year',
2592000 => 'month',
604800 => 'week',
86400 => 'day',
3600 => 'hour',
60 => 'minute',
1 => 'second'
);
foreach ($tokens as $unit => $text) {
if ($timediff < $unit) continue;
$numberOfUnits = floor($timediff / $unit);
return $numberOfUnits.' '.$text.(($numberOfUnits>1)?'s':'').' ago';
}
}
/**
* A recursive glob() function.
* From http://in.php.net/manual/en/function.glob.php#106595
* @param string $pattern The glob pattern to use to find filenames.
* @param integer $flags The glob flags to use when finding filenames.
* @return array An array of the filepaths that match the given glob.
*/
function glob_recursive($pattern, $flags = 0)
{
$files = glob($pattern, $flags);
foreach (glob(dirname($pattern).'/*', GLOB_ONLYDIR|GLOB_NOSORT) as $dir)
{
$prefix = "$dir/";
// Remove the "./" from the beginning if it exists
if(substr($prefix, 0, 2) == "./") $prefix = substr($prefix, 2);
$files = array_merge($files, glob_recursive($prefix . basename($pattern), $flags));
}
return $files;
}
/**
* Gets a list of all the sub pages of the current page.
* @param object $pageindex The pageindex to use to search.
* @param string $pagename The name of the page to list the sub pages of.
* @return object An object containing all the subpages and their
* respective distances from the given page name in the pageindex tree.
*/
function get_subpages($pageindex, $pagename)
{
$pagenames = get_object_vars($pageindex);
$result = new stdClass();
$stem = "$pagename/";
$stem_length = strlen($stem);
foreach($pagenames as $entry => $value)
{
if(substr($entry, 0, $stem_length) == $stem)
{
// We found a subpage
// Extract the subpage's key relative to the page that we are searching for
$subpage_relative_key = substr($entry, $stem_length, -3);
// Calculate how many times removed the current subpage is from the current page. 0 = direct descendant.
$times_removed = substr_count($subpage_relative_key, "/");
// Store the name of the subpage we found
$result->$entry = $times_removed;
}
}
unset($pagenames);
return $result;
}
/**
* Makes sure that a subpage's parents exist.
* Note this doesn't check the pagename itself.
* @param The pagename to check.
*/
function check_subpage_parents($pagename)
{
global $pageindex, $paths;
// Save the new pageindex and return if there aren't any more parent pages to check
if(strpos($pagename, "/") === false)
{
file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
return;
}
$parent_pagename = substr($pagename, 0, strrpos($pagename, "/"));
$parent_page_filename = "$parent_pagename.md";
if(!file_exists($parent_page_filename))
{
// This parent page doesn't exist! Create it and add it to the page index.
touch($parent_page_filename, 0);
$newentry = new stdClass();
$newentry->filename = $parent_page_filename;
$newentry->size = 0;
$newentry->lastmodified = 0;
$newentry->lasteditor = "none";
$pageindex->$parent_pagename = $newentry;
}
check_subpage_parents($parent_pagename);
}
/**
* Makes a path safe.
* Paths may only contain alphanumeric characters, spaces, underscores, and
* dashes.
* @param string $string The string to make safe.
* @return string A safe version of the given string.
*/
function makepathsafe($string)
{
$string = preg_replace("/[^0-9a-zA-Z\_\-\ \/\.]/i", "", $string);
$string = preg_replace("/\.+/", ".", $string);
return $string;
}
/**
* Hides an email address from bots by adding random html entities.
* @param string $str The original email address
* @return string The mangled email address.
*/
function hide_email($str)
{
$hidden_email = "";
for($i = 0; $i < strlen($str); $i++)
{
if($str[$i] == "@")
{
$hidden_email .= "&#" . ord("@") . ";";
continue;
}
if(rand(0, 1) == 0)
$hidden_email .= $str[$i];
else
$hidden_email .= "&#" . ord($str[$i]) . ";";
}
return $hidden_email;
}
/**
* Checks to see if $haystack starts with $needle.
* @param string $haystack The string to search.
* @param string $needle The string to search for at the beginning
* of $haystack.
* @return boolean Whether $needle can be found at the beginning
* of $haystack.
*/
function starts_with($haystack, $needle)
{
$length = strlen($needle);
return (substr($haystack, 0, $length) === $needle);
}
/**
* Case-insensitively finds all occurrences of $needle in $haystack. Handles
* UTF-8 characters correctly.
* From http://www.pontikis.net/tip/?id=16, and
* based on http://www.php.net/manual/en/function.strpos.php#87061
* @param string $haystack The string to search.
* @param string $needle The string to find.
* @return array || false An array of match indices, or false if
* nothing was found.
*/
function mb_stripos_all($haystack, $needle) {
$s = 0; $i = 0;
while(is_integer($i)) {
$i = function_exists("mb_stripos") ? mb_stripos($haystack, $needle, $s) : stripos($haystack, $needle, $s);
if(is_integer($i)) {
$aStrPos[] = $i;
$s = $i + (function_exists("mb_strlen") ? mb_strlen($needle) : strlen($needle));
}
}
if(isset($aStrPos))
return $aStrPos;
else
return false;
}
/**
* Returns the system's mime type mappings, considering the first extension
* listed to be cacnonical.
* From http://stackoverflow.com/a/1147952/1460422 by chaos.
* Edited by Starbeamrainbowlabs.
* @return array An array of mime type mappings.
*/
function system_mime_type_extensions()
{
global $settings;
$out = array();
$file = fopen($settings->mime_extension_mappings_location, 'r');
while(($line = fgets($file)) !== false) {
$line = trim(preg_replace('/#.*/', '', $line));
if(!$line)
continue;
$parts = preg_split('/\s+/', $line);
if(count($parts) == 1)
continue;
$type = array_shift($parts);
if(!isset($out[$type]))
$out[$type] = array_shift($parts);
}
fclose($file);
return $out;
}
/**
* Converts a given mime type to it's associated file extension.
* From http://stackoverflow.com/a/1147952/1460422 by chaos.
* Edited by Starbeamrainbowlabs.
* @param string $type The mime type to convert.
* @return string The extension for the given mime type.
*/
function system_mime_type_extension($type)
{
static $exts;
if(!isset($exts))
$exts = system_mime_type_extensions();
return isset($exts[$type]) ? $exts[$type] : null;
}
/**
* Returns the system MIME type mapping of extensions to MIME types.
* From http://stackoverflow.com/a/1147952/1460422 by chaos.
* Edited by Starbeamrainbowlabs.
* @return array An array mapping file extensions to their associated mime types.
*/
function system_extension_mime_types()
{
global $settings;
$out = array();
$file = fopen($settings->mime_extension_mappings_location, 'r');
while(($line = fgets($file)) !== false) {
$line = trim(preg_replace('/#.*/', '', $line));
if(!$line)
continue;
$parts = preg_split('/\s+/', $line);
if(count($parts) == 1)
continue;
$type = array_shift($parts);
foreach($parts as $part)
$out[$part] = $type;
}
fclose($file);
return $out;
}
/**
* Converts a given file extension to it's associated mime type.
* From http://stackoverflow.com/a/1147952/1460422 by chaos.
* Edited by Starbeamrainbowlabs.
* @param string $ext The extension to convert.
* @return string The mime type associated with the given extension.
*/
function system_extension_mime_type($ext) {
static $types;
if(!isset($types))
$types = system_extension_mime_types();
$ext = strtolower($ext);
return isset($types[$ext]) ? $types[$ext] : null;
}
/**
* Generates a stack trace.
* @param bool $log_trace Whether to send the stack trace to the error log.
* @return string A string prepresentation of a stack trace.
*/
function stack_trace($log_trace = true)
{
$result = "";
$stackTrace = debug_backtrace();
$stackHeight = count($stackTrace);
foreach ($stackTrace as $i => $stackEntry)
{
$result .= "#" . ($stackHeight - $i) . " - " . $stackEntry["file"] . ":" . $stackEntry["line"] . " (" . $stackEntry["function"] . ":" . count($stackEntry["args"]) . ")\n";
}
if($log_trace)
error_log($result);
return $result;
}
/**
* Polyfill getallheaders()
*/
if (!function_exists('getallheaders')) {
function getallheaders()
{
if (!is_array($_SERVER))
return [];
$headers = array();
foreach ($_SERVER as $name => $value) {
if (substr($name, 0, 5) == 'HTTP_') {
$headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
}
}
return $headers;
}
}
/**
* Renders a timestamp in HTML.
* @param int $timestamp The timestamp to render.
* @return string HTML representing the given timestamp.
*/
function render_rchange_timestamp($timestamp)
{
return "";
}
/**
* Renders a page name in HTML.
* @param object $rchange The recent change to render as a page name
* @return string HTML representing the name of the given page.
*/
function render_rchange_pagename($rchange)
{
global $pageindex;
$pageDisplayName = $rchange->page;
if(isset($pageindex->$pageDisplayName) and !empty($pageindex->$pageDisplayName->redirect))
$pageDisplayName = "$pageDisplayName";
$pageDisplayLink = "$pageDisplayName";
return $pageDisplayName;
}
/**
* Renders an editor's name in HTML.
* @param string $editorName The name of the editor to render.
* @return string HTML representing the given editor's name.
*/
function render_rchange_editor($editorName)
{
return "✎ $editorName";
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
////////////////////// Security and Consistency Measures //////////////////////
///////////////////////////////////////////////////////////////////////////////
/*
* Sort out the pageindex. Create it if it doesn't exist, and load + parse it
* if it does.
*/
if(!file_exists($paths->pageindex))
{
$glob_str = $env->storage_prefix . "*.md";
$existingpages = glob_recursive($glob_str);
// Debug statements. Uncomment when debugging the pageindex regenerator.
// var_dump($env->storage_prefix);
// var_dump($glob_str);
// var_dump($existingpages);
$pageindex = new stdClass();
// We use a for loop here because foreach doesn't loop over new values inserted
// while we were looping
for($i = 0; $i < count($existingpages); $i++)
{
$pagefilename = $existingpages[$i];
// Create a new entry
$newentry = new stdClass();
$newentry->filename = utf8_encode(substr( // Store the filename, whilst trimming the storage prefix
$pagefilename,
strlen(preg_replace("/^\.\//i", "", $env->storage_prefix)) // glob_recursive trim the ./ from returned filenames , so we need to as well
));
// Remove the `./` from the beginning if it's still hanging around
if(substr($newentry->filename, 0, 2) == "./")
$newentry->filename = substr($newentry->filename, 2);
$newentry->size = filesize($pagefilename); // Store the page size
$newentry->lastmodified = filemtime($pagefilename); // Store the date last modified
// Todo find a way to keep the last editor independent of the page index
$newentry->lasteditor = utf8_encode("unknown"); // Set the editor to "unknown"
// Extract the name of the (sub)page without the ".md"
$pagekey = utf8_encode(substr($newentry->filename, 0, -3));
if(file_exists($env->storage_prefix . $pagekey) && // If it exists...
!is_dir($env->storage_prefix . $pagekey)) // ...and isn't a directory
{
// This page (potentially) has an associated file!
// Let's investigate.
// Blindly add the file to the pageindex for now.
// Future We might want to do a security check on the file later on.
// File a bug if you think we should do this.
$newentry->uploadedfile = true; // Yes this page does have an uploaded file associated with it
$newentry->uploadedfilepath = $pagekey; // It's stored here
// Work out what kind of file it really is
$mimechecker = finfo_open(FILEINFO_MIME_TYPE);
$newentry->uploadedfilemime = finfo_file($mimechecker, $env->storage_prefix . $pagekey);
}
// Debug statements. Uncomment when debugging the pageindex regenerator.
// echo("pagekey: ");
// var_dump($pagekey);
// echo("newentry: ");
// var_dump($newentry);
// Subpage parent checker
if(strpos($pagekey, "/") !== false)
{
// We have a sub page people
// Work out what our direct parent's key must be in order to check to
// make sure that it actually exists. If it doesn't, then we need to
// create it.
$subpage_parent_key = substr($pagekey, 0, strrpos($pagekey, "/"));
$subpage_parent_filename = "$env->storage_prefix$subpage_parent_key.md";
if(array_search($subpage_parent_filename, $existingpages) === false)
{
// Our parent page doesn't actually exist - create it
touch($subpage_parent_filename, 0);
// Furthermore, we should add this page to the list of existing pages
// in order for it to be indexed
$existingpages[] = $subpage_parent_filename;
}
}
// Store the new entry in the new page index
$pageindex->$pagekey = $newentry;
}
file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
unset($existingpages);
}
else
{
$pageindex_read_start = microtime(true);
$pageindex = json_decode(file_get_contents($paths->pageindex));
header("x-pageindex-decode-time: " . round((microtime(true) - $pageindex_read_start)*1000, 3) . "ms");
}
//////////////////////////
///// Page id system /////
//////////////////////////
if(!file_exists($paths->idindex))
file_put_contents($paths->idindex, "{}");
$idindex = json_decode(file_get_contents($paths->idindex));
class ids
{
/*
* @summary Gets the page id associated with the given pagename.
*/
public static function getid($pagename)
{
global $idindex;
foreach ($idindex as $id => $entry)
{
if($entry == $pagename)
return $id;
}
// This pagename doesn't have an id - assign it one quick!
return self::assign($pagename);
}
/*
* @summary Gets the page name associated with the given page id.
*/
public static function getpagename($id)
{
global $idindex;
if(!isset($idindex->$id))
return false;
else
return $idindex->$id;
}
/*
* @summary Moves a page in the id index from $oldpagename to $newpagename.
* Note that this function doesn't perform any special checks to
* make sure that the destination name doesn't already exist.
*/
public static function movepagename($oldpagename, $newpagename)
{
global $idindex, $paths;
$pageid = self::getid($oldpagename);
$idindex->$pageid = $newpagename;
file_put_contents($paths->idindex, json_encode($idindex));
}
/*
* @summary Removes the given page name from the id index. Note that this
* function doesn't handle multiple entries with the same name.
*/
public static function deletepagename($pagename)
{
global $idindex, $paths;
// Get the id of the specified page
$pageid = self::getid($pagename);
// Remove it from the pageindex
unset($idindex->$pageid);
// Save the id index
file_put_contents($paths->idindex, json_encode($idindex));
}
/*
* @summary Assigns an id to a pagename. Doesn't check to make sure that
* pagename doesn't exist in the pageindex.
*/
protected static function assign($pagename)
{
global $idindex, $paths;
$nextid = count(array_keys(get_object_vars($idindex)));
// Increment the generated id until it's unique
while(isset($idindex->nextid))
$nextid++;
// Update the id index
$idindex->$nextid = utf8_encode($pagename);
// Save the id index
file_put_contents($paths->idindex, json_encode($idindex));
return $nextid;
}
}
//////////////////////////
//////////////////////////
// Work around an Opera + Syntaxtic bug where there is no margin at the left
// hand side if there isn't a query string when accessing a .php file.
if(!isset($_GET["action"]) and !isset($_GET["page"]))
{
http_response_code(302);
header("location: index.php?action=$settings->defaultaction&page=$settings->defaultpage");
exit();
}
// Make sure that the action is set
if(!isset($_GET["action"]))
$_GET["action"] = $settings->defaultaction;
// Make sure that the page is set
if(!isset($_GET["page"]) or strlen($_GET["page"]) === 0)
$_GET["page"] = $settings->defaultpage;
// Redirect the user to the safe version of the path if they entered an unsafe character
if(makepathsafe($_GET["page"]) !== $_GET["page"])
{
http_response_code(301);
header("location: index.php?action=" . rawurlencode($_GET["action"]) . "&page=" . makepathsafe($_GET["page"]));
header("x-requested-page: " . $_GET["page"]);
header("x-actual-page: " . makepathsafe($_GET["page"]));
exit();
}
// Finish setting up the environment object
$env->page = $_GET["page"];
$env->action = strtolower($_GET["action"]);
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//////////////////////////////// HTML fragments ////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
class page_renderer
{
public static $html_template = "
{title}
{header-html}
{body}
";
public static $main_content_template = "{navigation-bar}
{sitename}
{content}
{navigation-bar-bottom}
{all-pages-datalist}";
public static $minimal_content_template = "{content}
";
// An array of functions that have been registered to process the
// find / replace array before the page is rendered. Note that the function
// should take a *reference* to an array as its only argument.
protected static $part_processors = [];
// Registers a function as a part post processor.
public static function register_part_preprocessor($function)
{
global $settings;
// Make sure that the function we are about to register is valid
if(!is_callable($function))
{
http_response_code(500);
$admin_name = $settings->admindetails["name"];
$admin_email = hide_email($settings->admindetails["email"]);
exit(page_renderer::render("$settings->sitename - Module Error", "
$settings->sitename has got a misbehaving module installed that tried to register an invalid HTML handler with the page renderer. Please contact $settings->sitename's administrator $admin_name at $admin_email."));
}
self::$part_processors[] = $function;
return true;
}
public static function render($title, $content, $body_template = false)
{
global $settings, $start_time, $version;
if($body_template === false)
$body_template = self::$main_content_template;
if(strlen($settings->logo_url) > 0)
{
// A logo url has been specified
$logo_html = "";
switch($settings->logo_position)
{
case "left":
$logo_html = "$logo_html $settings->sitename";
break;
case "right":
$logo_html .= " $settings->sitename";
break;
default:
throw new Exception("Invalid logo_position '$settings->logo_position'. Valid values are either \"left\" or \"right\" and are case sensitive.");
}
}
$parts = [
"{body}" => $body_template,
"{sitename}" => $logo_html,
"{version}" => $version,
"{favicon-url}" => $settings->favicon,
"{header-html}" => self::get_header_html(),
"{navigation-bar}" => self::render_navigation_bar($settings->nav_links, $settings->nav_links_extra, "top"),
"{navigation-bar-bottom}" => self::render_navigation_bar($settings->nav_links_bottom, [], "bottom"),
"{admin-details-name}" => $settings->admindetails["name"],
"{admin-details-email}" => $settings->admindetails["email"],
"{admins-name-list}" => implode(", ", $settings->admins),
"{generation-date}" => date("l jS \of F Y \a\\t h:ia T"),
"{all-pages-datalist}" => self::generate_all_pages_datalist(),
"{footer-message}" => $settings->footer_message,
/// Secondary Parts ///
"{content}" => $content,
"{title}" => $title,
];
// Pass the parts through the part processors
foreach(self::$part_processors as $function)
{
$function($parts);
}
$result = self::$html_template;
$result = str_replace(array_keys($parts), array_values($parts), $result);
$result = str_replace([
], [
], $result);
$result = str_replace("{generation-time-taken}", round((microtime(true) - $start_time)*1000, 2), $result);
return $result;
}
public static function render_main($title, $content)
{
return self::render($title, $content, self::$main_content_template);
}
public static function render_minimal($title, $content)
{
return self::render($title, $content, self::$minimal_content_template);
}
public static function get_header_html()
{
global $settings;
$result = self::get_css_as_html();
if(!empty($settings->enable_math_rendering))
$result .= "
";
return $result;
}
public static function get_css_as_html()
{
global $settings;
if(preg_match("/^[^\/]*\/\/|^\//", $settings->css))
return "";
else
{
$css = $settings->css;
if(!empty($settings->optimize_pages))
{
// CSS Minification ideas by Jean from catswhocode.com
// Link: http://www.catswhocode.com/blog/3-ways-to-compress-css-files-using-php
// Remove comments
$css = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', "", $css);
// Cut down whitespace
$css = preg_replace('/\s+/', " ", $css);
// Remove whitespace after colons and semicolons
$css = str_replace([
" :",
": ",
"; ",
" { ",
" } "
], [
":",
":",
";",
"{",
"}"
], $css);
}
return "";
}
}
public static $nav_divider = " | ";
/**
* Renders a navigation bar from an array of links. See
* $settings->nav_links for format information.
* @param array $nav_links The links to add to the navigation bar.
* @param array $nav_links_extra The extra nav links to add to
* the "More..." menu.
*/
public static function render_navigation_bar($nav_links, $nav_links_extra, $class = "")
{
global $settings, $env;
$result = "";
return $result;
}
public static function render_username($name)
{
global $settings;
$result = "";
if(in_array($name, $settings->admins))
$result .= $settings->admindisplaychar;
$result .= $name;
return $result;
}
public static function generate_all_pages_datalist()
{
global $pageindex;
$arrayPageIndex = get_object_vars($pageindex);
ksort($arrayPageIndex);
$result = "";
return $result;
}
}
//////////////////////////////////////
///// Extra consistency measures /////
//////////////////////////////////////
// Redirect to the search page if there isn't a page with the requested name
if(!isset($pageindex->{$env->page}) and isset($_GET["search-redirect"]))
{
http_response_code(307);
$url = "?action=search&query=" . rawurlencode($env->page);
header("location: $url");
exit(page_renderer::render("Non existent page - $settings->sitename", "
There isn't a page on $settings->sitename with that name. However, you could search for this page name in other pages.
"));
}
// Redirect the user to the login page if:
// - A login is required to view this wiki
// - The user isn't already requesting the login page
// Note we use $_GET here because $env->action isn't populated at this point
if($settings->require_login_view === true && // If this site requires a login in order to view pages
!$env->is_logged_in && // And the user isn't logged in
!in_array($_GET["action"], [ "login", "checklogin" ])) // And the user isn't trying to login
{
// Redirect the user to the login page
http_response_code(307);
$url = "?action=login&returnto=" . rawurlencode($_SERVER["REQUEST_URI"]) . "&required=true";
header("location: $url");
exit(page_renderer::render("Login required - $settings->sitename", "
$settings->sitename requires that you login before you are able to access it.
"));
}
//////////////////////////////////////
//////////////////////////////////////
//////////////////////////
/// Module functions ///
//////////////////////////
// These functions are //
// used by modules to //
// register themselves //
// or new pages. //
//////////////////////////
$modules = []; // List that contains all the loaded modules
// Function to register a module
function register_module($moduledata)
{
global $modules;
//echo("registering module\n");
//var_dump($moduledata);
$modules[] = $moduledata;
}
/**
* Checks to see whether a module with the given id exists.
* @param string $id The id to search for.
* @return bool Whether a module is currently loaded with the given id.
*/
function module_exists($id)
{
global $modules;
foreach($modules as $module)
{
if($module["id"] == $id)
return true;
}
return false;
}
// Function to register an action handler
$actions = new stdClass();
function add_action($action_name, $func)
{
global $actions;
$actions->$action_name = $func;
}
$parsers = [
"none" => function() {
throw new Exception("No parser registered!");
}
];
/**
* Registers a new parser.
* @param string $name The name of the new parser to register.
* @param function $parser_code The function to register as a new parser.
*/
function add_parser($name, $parser_code)
{
global $parsers;
if(isset($parsers[$name]))
throw new Exception("Can't register parser with name '$name' because a parser with that name already exists.");
$parsers[$name] = $parser_code;
}
function parse_page_source($source)
{
global $settings, $parsers;
if(!isset($parsers[$settings->parser]))
exit(page_renderer::render_main("Parsing error - $settings->sitename", "
Parsing some page source data failed. This is most likely because $settings->sitename has the parser setting set incorrectly. Please contact " . $settings->admindetails["name"] . ", your $settings->sitename Administrator."));
/* Not needed atm because escaping happens when saving, not when rendering *
if($settings->clean_raw_html)
$source = htmlentities($source, ENT_QUOTES | ENT_HTML5);
*/
return $parsers[$settings->parser]($source);
}
// Function to
$save_preprocessors = [];
/**
* Register a new proprocessor that will be executed just before
* an edit is saved.
* @param function $func The function to register.
*/
function register_save_preprocessor($func)
{
global $save_preprocessors;
$save_preprocessors[] = $func;
}
$help_sections = [];
/**
* Adds a new help section to the help page.
* @param string $index The string to index the new section under.
* @param string $title The title to display above the section.
* @param string $content The content to display.
*/
function add_help_section($index, $title, $content)
{
global $help_sections;
$help_sections[$index] = [
"title" => $title,
"content" => $content
];
}
if(!empty($settings->enable_math_rendering))
add_help_section("22-Mathematical-Expressions", "Methematical Expressions", "
$settings->sitename supports rendering of mathematical expressions. Mathematical expressions can be included practically anywhere in your page. Expressions should be written in LaTeX and enclosed in dollar signs like this: $x^2$.
Note that expression parsing is done on the viewer's computer with javascript (specifically MathJax) and not by $settings->sitename directly (also called client side rendering).
");
//////////////////////////////////////////////////////////////////
// %next_module% //
//////////////////////////////////////////////////////////////////
// Execute each module's code
foreach($modules as $moduledata)
{
$moduledata["code"]();
}
// Make sure that the credits page exists
if(!isset($actions->credits))
{
exit(page_renderer::render_main("Error - $settings->$sitename", "
No credits page detected. The credits page is a required module!