classes/platal.php

   1 <?php
   2 /***************************************************************************
   3  *  Copyright (C) 2003-2008 Polytechnique.org                              *
   4  *  http://opensource.polytechnique.org/                                   *
   5  *                                                                         *
   6  *  This program is free software; you can redistribute it and/or modify   *
   7  *  it under the terms of the GNU General Public License as published by   *
   8  *  the Free Software Foundation; either version 2 of the License, or      *
   9  *  (at your option) any later version.                                    *
  10  *                                                                         *
  11  *  This program is distributed in the hope that it will be useful,        *
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
  14  *  GNU General Public License for more details.                           *
  15  *                                                                         *
  16  *  You should have received a copy of the GNU General Public License      *
  17  *  along with this program; if not, write to the Free Software            *
  18  *  Foundation, Inc.,                                                      *
  19  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA                *
  20  ***************************************************************************/
  21
  22 define('PL_DO_AUTH',   300);
  23 define('PL_FORBIDDEN', 403);
  24 define('PL_NOT_FOUND', 404);
  25
  26 class Platal
  27 {
  28     private $__mods;
  29     private $__hooks;
  30
  31     protected $https;
  32
  33     public $ns;
  34     public $path;
  35     public $argv;
  36
  37     static private $_page = null;
  38
  39     public function __construct()
  40     {
  41         global $platal, $globals, $session;
  42         $platal  =& $this;
  43         $globalclass = PL_GLOBALS_CLASS;
  44         $globals = new $globalclass();
  45         $sessionclass = PL_SESSION_CLASS;
  46         $session = new $sessionclass();
  47
  48         $modules    = func_get_args();
  49         if (is_array($modules[0])) {
  50             $modules = $modules[0];
  51         }
  52         $this->path = trim(Get::_get('n', null), '/');
  53
  54         $this->__mods  = array();
  55         $this->__hooks = array();
  56
  57         array_unshift($modules, 'core');
  58         foreach ($modules as $module) {
  59             $module = strtolower($module);
  60             $this->__mods[$module] = $m = PLModule::factory($module);
  61             $this->__hooks += $m->handlers();
  62         }
  63
  64         global $globals;
  65         if ($globals->mode == '') {
  66             pl_redirect('index.html');
  67         }
  68     }
  69
  70     public function pl_self($n = null)
  71     {
  72         if (is_null($n))
  73             return $this->path;
  74
  75         if ($n >= 0)
  76             return join('/', array_slice($this->argv, 0, $n + 1));
  77
  78         if ($n <= -count($this->argv))
  79             return $this->argv[0];
  80
  81         return join('/', array_slice($this->argv, 0, $n));
  82     }
  83
  84     protected function find_hook()
  85     {
  86         $p = $this->path;
  87
  88         while ($p) {
  89             if (array_key_exists($p, $this->__hooks))
  90                 break;
  91
  92             $p = substr($p, 0, strrpos($p, '/'));
  93         }
  94
  95         if (empty($this->__hooks[$p])) {
  96             return null;
  97         }
  98
  99         $hook = $this->__hooks[$p];
 100
 101         if (!is_callable($hook['hook'])) {
 102             return null;
 103         }
 104
 105         $this->https = ($hook['type'] & NO_HTTPS) ? false : true;
 106         $this->argv    = explode('/', substr($this->path, strlen($p)));
 107         $this->argv[0] = $p;
 108
 109         return $hook;
 110     }
 111
 112     protected function find_nearest_key($key, array &$array)
 113     {
 114         $keys    = array_keys($array);
 115         if (in_array($key, $keys)) {
 116             return $key;
 117         }
 118
 119         if (($pos = strpos($key, '.php')) !== false) {
 120             $key = substr($key, 0, $pos);
 121         }
 122
 123         $has_end = in_array("#final#", $keys);
 124         if (strlen($key) > 24 && $has_end) {
 125             return "#final#";
 126         }
 127
 128         foreach ($keys as $k) {
 129             if ($k == "#final#") {
 130                 continue;
 131             }
 132             $lev = levenshtein($key, $k);
 133
 134             if ((!isset($val) || $lev < $val)
 135                 && ($lev <= strlen($k)/2 || strpos($k, $key) !== false || strpos($key, $k) !== false)) {
 136                 $val  = $lev;
 137                 $best = $k;
 138             }
 139         }
 140         if (!isset($best) && $has_end) {
 141             return "#final#";
 142         } else if (isset($best)) {
 143             return $best;
 144         }
 145         return null;
 146     }
 147
 148     public function near_hook()
 149     {
 150         $hooks = array();
 151         $leafs = array();
 152         foreach ($this->__hooks as $hook=>$handler) {
 153             if (!$this->check_perms($handler['perms'])) {
 154                 continue;
 155             }
 156             $parts = split('/', $hook);
 157             $place =& $hooks;
 158             foreach ($parts as $part) {
 159                 if (!isset($place[$part])) {
 160                     $place[$part] = array();
 161                 }
 162                 $place =& $place[$part];
 163             }
 164             $leaf = $parts[count($parts)-1];
 165             if (!isset($leafs[$leaf])) {
 166                 $leafs[$leaf] = $hook;
 167             } else if (is_array($leafs[$leaf])) {
 168                 $leafs[$leaf][] = $hook;
 169             } else {
 170                 $leafs[$leaf] = array($hook, $leafs[$leaf]);
 171             }
 172             $place["#final#"] = array();
 173         }
 174
 175         // search for the nearest full path
 176         $p = split('/', $this->path);
 177         $place =& $hooks;
 178         $link  = '';
 179         foreach ($p as $k) {
 180             if (!isset($ended)) {
 181                 $key = $this->find_nearest_key($k, $place);
 182             } else {
 183                 $key = $k;
 184             }
 185             if ($key == "#final#") {
 186                 if (!array_key_exists($link, $this->__hooks)) {
 187                     $link = '';
 188                     break;
 189                 }
 190                 $key = $k;
 191                 $ended = true;
 192             }
 193             if (!is_null($key)) {
 194                 if (!empty($link)) {
 195                     $link .= '/';
 196                 }
 197                 $link .= $key;
 198                 $place =& $place[$key];
 199             } else {
 200                 $link = '';
 201                 break;
 202             }
 203         }
 204         if ($link == $this->path) {
 205             $link = '';
 206         }
 207         if ($link && levenshtein($link, $this->path) < strlen($link)/3) {
 208             return $link;
 209         }
 210
 211         // search for missing namespace (the given name is a leaf)
 212         $leaf = array_shift($p);
 213         $args = count($p) ? '/' . implode('/', $p) : '';
 214         if (isset($leafs[$leaf]) && !is_array($leafs[$leaf]) && $leafs[$leaf] != $this->path) {
 215             return $leafs[$leaf] . $args;
 216         }
 217         unset($val);
 218         $best = null;
 219         foreach ($leafs as $k=>&$path) {
 220             if (is_array($path)) {
 221                 continue;
 222             }
 223             $lev = levenshtein($leaf, $k);
 224
 225             if ((!isset($val) || $lev < $val)
 226                 && ($lev <= strlen($k)/2 || strpos($k, $leaf) !== false || strpos($leaf, $k) !== false)) {
 227                 $val  = $lev;
 228                 $best = $path;
 229             }
 230         }
 231         return $best == null ? ( $link ? $link : null ) : $best . $args;
 232     }
 233
 234     protected function check_perms($perms)
 235     {
 236         if (!$perms) { // No perms, no check
 237             return true;
 238         }
 239         $s_perms = S::v('perms');
 240         return $s_perms->hasFlagCombination($perms);
 241     }
 242
 243     private function call_hook(PlPage &$page)
 244     {
 245         $hook = $this->find_hook();
 246         if (empty($hook)) {
 247             return PL_NOT_FOUND;
 248         }
 249         global $globals, $session;
 250         if ($this->https && !$_SERVER['HTTPS'] && $globals->core->secure_domain) {
 251             http_redirect('https://' . $globals->core->secure_domain . $_SERVER['REQUEST_URI']);
 252         }
 253
 254         $args    =  $this->argv;
 255         $args[0] =& $page;
 256
 257         if ($hook['auth'] > S::v('auth', AUTH_PUBLIC)) {
 258             if ($hook['type'] & DO_AUTH) {
 259                 if (!$session->doAuth()) {
 260                     $this->force_login($page);
 261                 }
 262             } else {
 263                 return PL_FORBIDDEN;
 264             }
 265         }
 266         if ($hook['auth'] != AUTH_PUBLIC && !$this->check_perms($hook['perms'])) {
 267             return PL_FORBIDDEN;
 268         }
 269
 270         $val = call_user_func_array($hook['hook'], $args);
 271         if ($val == PL_DO_AUTH) {
 272             // The handler need a better auth with the current args
 273             if (!$session->doAuth()) {
 274                 $this->force_login($page);
 275             }
 276             $val = call_user_func_array($hook['hook'], $args);
 277         }
 278         return $val;
 279     }
 280
 281     public function force_login(PlPage &$page)
 282     {
 283         header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
 284         if (S::logged()) {
 285             $page->changeTpl('core/password_prompt_logged.tpl');
 286             $page->addJsLink('do_challenge_response_logged.js');
 287         } else {
 288             $page->changeTpl('core/password_prompt.tpl');
 289             $page->addJsLink('do_challenge_response.js');
 290         }
 291         $page->assign('platal', $this);
 292         $page->run();
 293     }
 294
 295     public function run()
 296     {
 297         $page =& self::page();
 298
 299         if (empty($this->path)) {
 300             $this->path = 'index';
 301         }
 302
 303         $page->assign('platal', $this);
 304         switch ($this->call_hook($page)) {
 305           case PL_FORBIDDEN:
 306             $this->__mods['core']->handler_403($page);
 307             break;
 308
 309           case PL_NOT_FOUND:
 310             $this->__mods['core']->handler_404($page);
 311             break;
 312         }
 313
 314         $page->assign('platal', $this);
 315         $page->run();
 316     }
 317
 318     public function on_subscribe($forlife, $uid, $promo, $pass)
 319     {
 320         $args = func_get_args();
 321         foreach ($this->__mods as $mod) {
 322             if (!is_callable($mod, 'on_subscribe'))
 323                 continue;
 324             call_user_func_array(array($mod, 'on_subscribe'), $args);
 325         }
 326     }
 327
 328     static public function &page()
 329     {
 330         global $platal, $page;
 331         if (is_null(self::$_page)) {
 332             $pageclass = PL_PAGE_CLASS;
 333             $page = new $pageclass();
 334             self::$_page =& $page;
 335         }
 336         return self::$_page;
 337     }
 338 }
 339
 340 // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8:
 341 ?>