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, $k);
 119             if ((!isset($val) || $lev < $val) && $lev <= (strlen($k)*2)/3) {
 120                 $val  = $lev;
 121                 $best = $k;
 122             }
 123         }
 124         if (!isset($best) && $has_end) {
 125             return "#final#";
 126         } else {
 127             return $best;
 128         }
 129         return null;
 130     }
 131
 132     public function near_hook()
 133     {
 134         $hooks = array();
 135         foreach ($this->__hooks as $hook=>$handler) {
 136             if (!empty($handler['perms']) && $handler['perms'] != S::v('perms')) {
 137                 continue;
 138             }
 139             $parts = split('/', $hook);
 140             $place =& $hooks;
 141             foreach ($parts as $part) {
 142                 if (!isset($place[$part])) {
 143                     $place[$part] = array();
 144                 }
 145                 $place =& $place[$part];
 146             }
 147             $place["#final#"] = array();
 148         }
 149
 150         $p = split('/', $this->path);
 151         $place =& $hooks;
 152         $link  = '';
 153         foreach ($p as $k) {
 154             if (!isset($ended)) {
 155                 $key = $this->find_nearest_key($k, $place);
 156             } else {
 157                 $key = $k;
 158             }
 159             if ($key == "#final#") {
 160                 if (!array_key_exists($link, $this->__hooks)) {
 161                     return null;
 162                 }
 163                 $key = $k;
 164                 $ended = true;
 165             }
 166             if (!is_null($key)) {
 167                 if (!empty($link)) {
 168                     $link .= '/';
 169                 }
 170                 $link .= $key;
 171                 $place =& $place[$key];
 172             } else {
 173                 return null;
 174             }
 175         }
 176         if ($link != $this->path) {
 177             return $link;
 178         }
 179         return null;
 180     }
 181
 182     protected function check_perms($perms)
 183     {
 184         if (!$perms) { // No perms, no check
 185             return true;
 186         }
 187         $s_perms = S::v('perms');
 188         return $s_perms->hasFlagCombination($perms);
 189     }
 190
 191     private function call_hook(PlatalPage &$page)
 192     {
 193         $hook = $this->find_hook();
 194         if (empty($hook)) {
 195             return PL_NOT_FOUND;
 196         }
 197         global $globals;
 198         if ($this->https && !$_SERVER['HTTPS'] && $globals->core->secure_domain) {
 199             http_redirect('https://' . $globals->core->secure_domain . $_SERVER['REQUEST_URI']);
 200         }
 201
 202         $args    = $this->argv;
 203         $args[0] = &$page;
 204
 205         if ($hook['auth'] > S::v('auth', AUTH_PUBLIC)) {
 206             if ($hook['type'] & DO_AUTH) {
 207                 if (!call_user_func(array($globals->session, 'doAuth'))) {
 208                     $this->force_login($page);
 209                 }
 210             } else {
 211                 return PL_FORBIDDEN;
 212             }
 213         }
 214         if ($hook['auth'] != AUTH_PUBLIC && !$this->check_perms($hook['perms'])) {
 215             return PL_FORBIDDEN;
 216         }
 217
 218         $val = call_user_func_array($hook['hook'], $args);
 219         if ($val & PL_DO_AUTH) {
 220             // The handler need a better auth with the current args
 221             if (!call_user_func(array($globals->session, 'doAuth'))) {
 222                 $this->force_login($page);
 223             }
 224             $val = call_user_func_array($hook['hook'], $args);
 225         }
 226         return $val;
 227     }
 228
 229     public function force_login(PlatalPage &$page)
 230     {
 231         if (S::logged()) {
 232             $page->changeTpl('core/password_prompt_logged.tpl');
 233             $page->addJsLink('do_challenge_response_logged.js');
 234         } else {
 235             $page->changeTpl('core/password_prompt.tpl');
 236             $page->addJsLink('do_challenge_response.js');
 237         }
 238         $page->assign('platal', $this);
 239         $page->run();
 240     }
 241
 242     public function run()
 243     {
 244         global $page;
 245
 246         new_skinned_page('platal/index.tpl');
 247
 248         if (empty($this->path)) {
 249             $this->path = 'index';
 250         }
 251
 252         $page->assign('platal', $this);
 253         switch ($this->call_hook($page)) {
 254           case PL_FORBIDDEN:
 255             $this->__mods['core']->handler_403($page);
 256             break;
 257
 258           case PL_NOT_FOUND:
 259             $this->__mods['core']->handler_404($page);
 260             break;
 261         }
 262
 263         $page->assign('platal', $this);
 264         $page->run();
 265     }
 266
 267     public function on_subscribe($forlife, $uid, $promo, $pass)
 268     {
 269         $args = func_get_args();
 270         foreach ($this->__mods as $mod) {
 271             if (!is_callable($mod, 'on_subscribe'))
 272                 continue;
 273             call_user_func_array(array($mod, 'on_subscribe'), $args);
 274         }
 275     }
 276 }
 277
 278 // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8:
 279 ?>