classes/platal.php

   1 <?php
   2 /***************************************************************************
   3  *  Copyright (C) 2003-2007 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     public function __construct()
  38     {
  39         $modules    = func_get_args();
  40         if (is_array($modules[0])) {
  41             $modules = $modules[0];
  42         }
  43         $this->path = trim(Get::_get('n', null), '/');
  44
  45         $this->__mods  = array();
  46         $this->__hooks = array();
  47
  48         array_unshift($modules, 'core');
  49         foreach ($modules as $module) {
  50             $module = strtolower($module);
  51             $this->__mods[$module] = $m = PLModule::factory($module);
  52             $this->__hooks += $m->handlers();
  53         }
  54     }
  55
  56     public function pl_self($n = null)
  57     {
  58         if (is_null($n))
  59             return $this->path;
  60
  61         if ($n >= 0)
  62             return join('/', array_slice($this->argv, 0, $n + 1));
  63
  64         if ($n <= -count($this->argv))
  65             return $this->argv[0];
  66
  67         return join('/', array_slice($this->argv, 0, $n));
  68     }
  69
  70     protected function find_hook()
  71     {
  72         $p = $this->path;
  73
  74         while ($p) {
  75             if (array_key_exists($p, $this->__hooks))
  76                 break;
  77
  78             $p = substr($p, 0, strrpos($p, '/'));
  79         }
  80
  81         if (empty($this->__hooks[$p])) {
  82             return null;
  83         }
  84
  85         $hook = $this->__hooks[$p];
  86
  87         if (!is_callable($hook['hook'])) {
  88             return null;
  89         }
  90
  91         $this->https = ($hook['type'] & NO_HTTPS) ? false : true;
  92         $this->argv    = explode('/', substr($this->path, strlen($p)));
  93         $this->argv[0] = $p;
  94
  95         return $hook;
  96     }
  97
  98     protected function find_nearest_key($key, array &$array)
  99     {
 100         $keys    = array_keys($array);
 101         if (in_array($key, $keys)) {
 102             return $key;
 103         }
 104
 105         if (($pos = strpos($key, '.php')) !== false) {
 106             $key = substr($key, 0, $pos);
 107         }
 108
 109         $has_end = in_array("#final#", $keys);
 110         if (strlen($key) > 24 && $has_end) {
 111             return "#final#";
 112         }
 113
 114         foreach ($keys as $k) {
 115             if ($k == "#final#") {
 116                 continue;
 117             }
 118             $lev = levenshtein($key, $k);
 119
 120             if ((!isset($val) || $lev < $val)
 121                 && ($lev <= strlen($k)/2 || strpos($k, $key) !== false || strpos($key, $k) !== false)) {
 122                 $val  = $lev;
 123                 $best = $k;
 124             }
 125         }
 126         if (!isset($best) && $has_end) {
 127             return "#final#";
 128         } else if (isset($best)) {
 129             return $best;
 130         }
 131         return null;
 132     }
 133
 134     public function near_hook()
 135     {
 136         $hooks = array();
 137         $leafs = array();
 138         foreach ($this->__hooks as $hook=>$handler) {
 139             if (!$this->check_perms($handler['perms'])) {
 140                 continue;
 141             }
 142             $parts = split('/', $hook);
 143             $place =& $hooks;
 144             foreach ($parts as $part) {
 145                 if (!isset($place[$part])) {
 146                     $place[$part] = array();
 147                 }
 148                 $place =& $place[$part];
 149             }
 150             $leaf = $parts[count($parts)-1];
 151             if (!isset($leafs[$leaf])) {
 152                 $leafs[$leaf] = $hook;
 153             } else if (is_array($leafs[$leaf])) {
 154                 $leafs[$leaf][] = $hook;
 155             } else {
 156                 $leafs[$leaf] = array($hook, $leafs[$leaf]);
 157             }
 158             $place["#final#"] = array();
 159         }
 160
 161         // search for the nearest full path
 162         $p = split('/', $this->path);
 163         $place =& $hooks;
 164         $link  = '';
 165         foreach ($p as $k) {
 166             if (!isset($ended)) {
 167                 $key = $this->find_nearest_key($k, $place);
 168             } else {
 169                 $key = $k;
 170             }
 171             if ($key == "#final#") {
 172                 if (!array_key_exists($link, $this->__hooks)) {
 173                     $link = '';
 174                     break;
 175                 }
 176                 $key = $k;
 177                 $ended = true;
 178             }
 179             if (!is_null($key)) {
 180                 if (!empty($link)) {
 181                     $link .= '/';
 182                 }
 183                 $link .= $key;
 184                 $place =& $place[$key];
 185             } else {
 186                 $link = '';
 187                 break;
 188             }
 189         }
 190         if ($link == $this->path) {
 191             $link = '';
 192         }
 193         if ($link && levenshtein($link, $this->path) < strlen($link)/3) {
 194             return $link;
 195         }
 196
 197         // search for missing namespace (the given name is a leaf)
 198         $leaf = array_shift($p);
 199         $args = count($p) ? '/' . implode('/', $p) : '';
 200         if (isset($leafs[$leaf]) && !is_array($leafs[$leaf]) && $leafs[$leaf] != $this->path) {
 201             return $leafs[$leaf] . $args;
 202         }
 203         unset($val);
 204         $best = null;
 205         foreach ($leafs as $k=>&$path) {
 206             if (is_array($path)) {
 207                 continue;
 208             }
 209             $lev = levenshtein($leaf, $k);
 210
 211             if ((!isset($val) || $lev < $val)
 212                 && ($lev <= strlen($k)/2 || strpos($k, $leaf) !== false || strpos($leaf, $k) !== false)) {
 213                 $val  = $lev;
 214                 $best = $path;
 215             }
 216         }
 217         return $best == null ? ( $link ? $link : null ) : $best . $args;
 218     }
 219
 220     protected function check_perms($perms)
 221     {
 222         if (!$perms) { // No perms, no check
 223             return true;
 224         }
 225         $s_perms = S::v('perms');
 226         return $s_perms->hasFlagCombination($perms);
 227     }
 228
 229     private function call_hook(PlatalPage &$page)
 230     {
 231         $hook = $this->find_hook();
 232         if (empty($hook)) {
 233             return PL_NOT_FOUND;
 234         }
 235         global $globals;
 236         if ($this->https && !$_SERVER['HTTPS'] && $globals->core->secure_domain) {
 237             http_redirect('https://' . $globals->core->secure_domain . $_SERVER['REQUEST_URI']);
 238         }
 239
 240         $args    =  $this->argv;
 241         $args[0] =& $page;
 242
 243         if ($hook['auth'] > S::v('auth', AUTH_PUBLIC)) {
 244             if ($hook['type'] & DO_AUTH) {
 245                 if (!call_user_func(array($globals->session, 'doAuth'))) {
 246                     $this->force_login($page);
 247                 }
 248             } else {
 249                 return PL_FORBIDDEN;
 250             }
 251         }
 252         if ($hook['auth'] != AUTH_PUBLIC && !$this->check_perms($hook['perms'])) {
 253             return PL_FORBIDDEN;
 254         }
 255
 256         $val = call_user_func_array($hook['hook'], $args);
 257         if ($val & PL_DO_AUTH) {
 258             // The handler need a better auth with the current args
 259             if (!call_user_func(array($globals->session, 'doAuth'))) {
 260                 $this->force_login($page);
 261             }
 262             $val = call_user_func_array($hook['hook'], $args);
 263         }
 264         return $val;
 265     }
 266
 267     public function force_login(PlatalPage &$page)
 268     {
 269         if (S::logged()) {
 270             $page->changeTpl('core/password_prompt_logged.tpl');
 271             $page->addJsLink('do_challenge_response_logged.js');
 272         } else {
 273             $page->changeTpl('core/password_prompt.tpl');
 274             $page->addJsLink('do_challenge_response.js');
 275         }
 276         $page->assign('platal', $this);
 277         $page->run();
 278     }
 279
 280     public function run()
 281     {
 282         global $page;
 283
 284         new_skinned_page('platal/index.tpl');
 285
 286         if (empty($this->path)) {
 287             $this->path = 'index';
 288         }
 289
 290         $page->assign('platal', $this);
 291         switch ($this->call_hook($page)) {
 292           case PL_FORBIDDEN:
 293             $this->__mods['core']->handler_403($page);
 294             break;
 295
 296           case PL_NOT_FOUND:
 297             $this->__mods['core']->handler_404($page);
 298             break;
 299         }
 300
 301         $page->assign('platal', $this);
 302         $page->run();
 303     }
 304
 305     public function on_subscribe($forlife, $uid, $promo, $pass)
 306     {
 307         $args = func_get_args();
 308         foreach ($this->__mods as $mod) {
 309             if (!is_callable($mod, 'on_subscribe'))
 310                 continue;
 311             call_user_func_array(array($mod, 'on_subscribe'), $args);
 312         }
 313     }
 314 }
 315
 316 // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8:
 317 ?>