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<?php
class Wiki
{
protected $_renderers = array(
'md' => 'Markdown',
'htm' => 'HTML', 'html' => 'HTML'
);
protected $_ignore = "/^\..*|^CVS$/"; // Match dotfiles and CVS
protected $_force_unignore = false; // always show these files (false to disable)
protected $_action;
protected $_default_page_data = array(
'title' => false, // will use APP_NAME by default
'description' => 'Wikitten is a small, fast, PHP wiki.',
'tags' => array('wikitten', 'wiki'),
'page' => ''
);
/**
* @param string $extension
* @return string|callable
*/
protected function _getRenderer($extension)
{
if (!isset($this->_renderers[$extension])) {
return false;
}
$renderer = $this->_renderers[$extension];
require_once __DIR__ . DIRECTORY_SEPARATOR . 'renderers' . DIRECTORY_SEPARATOR . "$renderer.php";
return $renderer;
}
protected function _render($page)
{
$path = LIBRARY . DIRECTORY_SEPARATOR . (strpos(PHP_OS, 'WIN') === 0 ? iconv('utf-8', 'gbk', $page) : $page);
$path = realpath($path);
$parts = explode('/', $page);
$not_found = function () use ($page) {
$page = htmlspecialchars($page, ENT_QUOTES);
throw new Exception("Page '$page' was not found");
};
if (!$this->_pathIsSafe($path)) {
$not_found();
}
// Handle directories by showing a neat listing of its
// contents
if (is_dir($path)) {
if (is_file($path . "/index.md"))
$path = $path . "/index.md";
else {
// Get a printable version of the actual folder name:
$dir_name = htmlspecialchars(end($parts), ENT_QUOTES, 'UTF-8');
// Get a printable version of the rest of the path,
// so that we can display it with a different appearance:
$rest_parts = array_slice($parts, 0, count($parts) - 1);
$rest_parts = htmlspecialchars(join("/", $rest_parts), ENT_QUOTES, 'UTF-8');
// Pass this to the render view, cleverly disguised as just
// another page, so we can make use of the tree, breadcrumb,
// etc.
$page_data = $this->_default_page_data;
$page_data['title'] = 'Listing: ' . $dir_name;
$this->_view('render', array(
'parts' => $parts,
'page' => $page_data,
'html' => "<h3><span class=\"directory-path\">$rest_parts/</span> $dir_name</h3><p>Use the tree menu on the left to select a file</p>",
'is_dir' => true
));
return;
}
}
$finfo = finfo_open(FILEINFO_MIME);
$mime_type = finfo_file($finfo, $path);
if (substr($mime_type, 0, 4) != 'text') {
// not an ASCII file, send it directly to the browser
$file = fopen($path, 'rb');
header("Content-Type: $mime_type");
header("Content-Length: " . filesize($path));
fpassthru($file);
exit();
}
$source = file_get_contents($path);
$extension = pathinfo($path, PATHINFO_EXTENSION);
$renderer = $this->_getRenderer($extension);
$page_data = $this->_default_page_data;
// Extract the JSON header, if the feature is enabled:
if (USE_PAGE_METADATA) {
list($source, $meta_data) = $this->_extractJsonFrontMatter($source);
$page_data = array_merge($page_data, $meta_data);
}
// We need to know the source file in case editing is enabled:
$page_data['file'] = $page;
$html = false;
if ($renderer && $renderer == 'HTML') {
$html = $renderer($source);
}
if ($renderer && $renderer == 'Markdown') {
if (strpos($source, "[gimmick: math]()") !== false) {
$html = '<script type="text/javascript" src="https://cdn.bootcss.com/mathjax/2.6.1/MathJax.js?config=TeX-AMS_CHTML"></script>' . PHP_EOL;
$source = str_replace("[gimmick: math]()", "", $source);
$html .= \Michelf\MarkdownExtra::defaultTransform($source);
} else
$html = \Michelf\MarkdownExtra::defaultTransform($source);
}
$this->_view('render', array(
'html' => $html,
'source' => $source,
'extension' => $extension,
'parts' => $parts,
'page' => $page_data,
'is_dir' => false,
'use_pastebin' => $this->_usePasteBin()
));
}
protected function _usePasteBin()
{
return defined('ENABLE_PASTEBIN') && ENABLE_PASTEBIN && defined('PASTEBIN_API_KEY') && PASTEBIN_API_KEY;
}
/**
* Given a file path, verifies if the file is safe to touch,
* given permissions, if it's within the library, etc.
*
* @param string $path
* @return bool
*/
protected function _pathIsSafe($path)
{
if ($path && strpos($path, LIBRARY) === 0 && is_readable($path)) {
return true;
}
return false;
}
/**
* Given a string with a page's source, attempts to locate a
* section of JSON Front Matter in the heading, and returns
* the remaining source, and an array of extracted meta data.
*
* JSON Front Matter will only be considered when present
* within two lines consisting of three dashes:
*
* ---
* { "title": "hello world" }
* ---
*
* Additionally, the opening and closing brackets may be dropped,
* and this method will still interpret the content as a hash:
*
* ---
* "title": "hello, world",
* "tags": ["hello", "world"]
* ---
*
* @param string $source
* @return array array($remaining_source, $meta_data)
*/
protected function _extractJsonFrontMatter($source)
{
static $front_matter_regex = "/^---[\r\n](.*)[\r\n]---[\r\n](.*)/s";
static $front_matter_regex2 = "/^```[\r\n]([^`]*)[\r\n]```[\r\n](.*)/s";
$source = ltrim($source);
$meta_data = array();
if (preg_match($front_matter_regex, $source, $matches) || preg_match($front_matter_regex2, $source, $matches)) {
$json = trim($matches[1]);
$source = trim($matches[2]);
// Locate or append starting and ending brackets,
// if necessary. I lazily only check the first
// character for a bracket, so that it'll work
// even if the user includes a hash in the last
// line:
if ($json[0] != '{') {
$json = '{' . $json . '}';
}
// Decode & validate the JSON payload:
$meta_data = json_decode($json, true, 512);
// Check for errors:
if ($meta_data === null) {
$error = json_last_error();
$message = 'There was an error parsing the JSON Front Matter for this page';
// todo: Better error information?
if ($error == JSON_ERROR_SYNTAX) {
$message .= ': Incorrect JSON syntax (missing comma, or double-quotes?)';
}
throw new RuntimeException($message);
}
}
return array($source, $meta_data);
}
protected function _view($view, $variables = array())
{
extract($variables);
$content = __DIR__ . DIRECTORY_SEPARATOR . 'views' . DIRECTORY_SEPARATOR . "$view.php";
if (!isset($layout)) {
$layout = __DIR__ . DIRECTORY_SEPARATOR . 'views' . DIRECTORY_SEPARATOR . 'layout.php';
}
if (file_exists($content)) {
ob_start();
include($content);
$content = ob_get_contents();
ob_end_clean();
if ($layout) {
include $layout;
} else {
echo $content;
}
} else {
throw new Exception("View $view not found");
}
}
protected function _getTree($dir = LIBRARY)
{
$return = array('directories' => array(), 'files' => array());
$isWindows = strpos(PHP_OS, 'WIN') === 0;
$ignore = $dir . DIRECTORY_SEPARATOR . 'ignore.php';
if(is_file($ignore) && is_array($ignoreItems = include($ignore)) ) {
$ignoreItems[] = 'ignore.php';
} else {
$ignoreItems = [];
}
$items = scandir($dir);
foreach ($items as $item) {
if (preg_match($this->_ignore, $item)) {
if ($this->_force_unignore === false || !preg_match($this->_force_unignore, $item)) {
continue;
}
}
$path = $dir . DIRECTORY_SEPARATOR . $item;
if($isWindows) {
$item = iconv('gbk', 'utf-8', $item);
}
if(in_array($item, $ignoreItems) ) {
continue;
}
if (is_dir($path)) {
$children = $this->_getTree($path);
if(!(IGNORE_EMPTY_PATH && empty($children) )) {
$return['directories'][$item] = $children;
}
continue;
}
$return['files'][$item] = $item;
}
uksort($return['directories'], "strnatcasecmp");
uksort($return['files'], "strnatcasecmp");
return $return['directories'] + $return['files'];
}
public function dispatch()
{
if (!function_exists("finfo_open")) {
die("<p>Please enable the PHP Extension <code style='background-color: #eee; border: 1px solid #ccc; padding: 3px; border-radius: 3px; line-height: 1;'>FileInfo.dll</code> by uncommenting or adding the following line:</p><pre style='background-color: #eee; border: 1px solid #ccc; padding: 5px; border-radius: 3px;'><code><span style='color: #999;'>;</span>extension=php_fileinfo.dll <span style='color: #999; margin-left: 25px;'># You can just uncomment by removing the semicolon (;) in the front.</span></code></pre>");
}
$action = $this->_getAction();
$actionMethod = "{$action}Action";
if ($action === null || !method_exists($this, $actionMethod)) {
$this->_404();
}
$this->$actionMethod();
}
protected function _getAction()
{
if (isset($_REQUEST['a'])) {
$action = $_REQUEST['a'];
if (in_array("{$action}Action", get_class_methods(get_class($this)))) {
$this->_action = $action;
}
} else {
$this->_action = 'index';
}
return $this->_action;
}
protected function _json($data = array())
{
header("Content-type: text/x-json");
echo(is_string($data) ? $data : json_encode($data));
exit();
}
protected function _isXMLHttpRequest()
{
if ($_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest') {
return true;
}
if (function_exists('apache_request_headers')) {
$headers = apache_request_headers();
if ($headers['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest') {
return true;
}
}
return false;
}
protected function _404($message = 'Page not found.')
{
header('HTTP/1.0 404 Not Found', true);
$page_data = $this->_default_page_data;
$page_data['title'] = 'Not Found';
$this->_view('uhoh', array(
'error' => $message,
'parts' => array('Uh-oh'),
'page' => $page_data
));
exit;
}
public function indexAction()
{
$request = parse_url($_SERVER['REQUEST_URI']);
$page = str_replace("###" . APP_DIR . "/", "", "###" . urldecode($request['path']));
if (!$page) {
if (file_exists(LIBRARY . DIRECTORY_SEPARATOR . DEFAULT_FILE)) {
$this->_render(DEFAULT_FILE);
return;
}
$this->_view('index', array(
'page' => $this->_default_page_data
));
return;
}
try {
$this->_render($page);
} catch (Exception $e) {
$this->_404($e->getMessage());
}
}
/**
* /?a=edit
* If ENABLE_EDITING is true, handles file editing through
* the web interface.
*/
public function editAction()
{
// Bail out early if editing isn't even enabled, or
// we don't get the right request method && params
// NOTE: $_POST['source'] may be empty if the user just deletes
// everything, but it should always be set.
if (!ENABLE_EDITING || $_SERVER['REQUEST_METHOD'] != 'POST'
|| empty($_POST['ref']) || !isset($_POST['source'])
) {
$this->_404();
}
$ref = $_POST['ref'];
$source = $_POST['source'];
$file = base64_decode($ref);
$path = realpath(LIBRARY . DIRECTORY_SEPARATOR . $file);
// Check if the file is safe to work with, otherwise just
// give back a generic 404 aswell, so we don't allow blind
// scanning of files:
// @todo: we CAN give back a more informative error message
// for files that aren't writable...
if (!$this->_pathIsSafe($path) && !is_writable($path)) {
$this->_404();
}
// Save the changes, and redirect back to the same page:
file_put_contents($path, $source);
$redirect_url = BASE_URL . "/$file";
header("HTTP/1.0 302 Found", true);
header("Location: $redirect_url");
exit();
}
/**
* Handle createion of PasteBin pastes
* @return string JSON response
*/
public function createPasteBinAction()
{
if (!$this->_usePasteBin()) {
$this->_404();
}
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
if (isset($_POST['ref'])) {
$file = base64_decode($_POST['ref']);
$path = realpath(LIBRARY . DIRECTORY_SEPARATOR . $file);
if (!$this->_pathIsSafe($path)) {
$this->_404();
} else {
$content = file_get_contents($path);
$name = pathinfo($path, PATHINFO_BASENAME);
require_once PLUGINS . DIRECTORY_SEPARATOR . 'PasteBin.php';
$response = array();
$pastebin = new PasteBin(PASTEBIN_API_KEY);
/**
* @todo Add/improve autodetection of file format
*/
$url = $pastebin->createPaste($content, PasteBin::PASTE_PRIVACY_PUBLIC, $name, PasteBin::PASTE_EXPIRE_1W);
if ($url) {
$response['status'] = 'ok';
$response['url'] = $url;
} else {
$response['status'] = 'fail';
$response['error'] = $pastebin->getError();
}
header('Content-Type: application/json');
echo json_encode($response);
exit();
}
}
}
exit();
}
/**
* Singleton
* @return Wiki
*/
static public function instance()
{
static $instance;
if (!($instance instanceof self)) {
$instance = new self();
}
return $instance;
}
}
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