classes/platal.php

   1 <?php
   2 /***************************************************************************
   3  *  Copyright (C) 2003-2006 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_FORBIDDEN', 403);
  23 define('PL_NOT_FOUND', 404);
  24
  25 class Platal
  26 {
  27     var $__mods;
  28     var $__hooks;
  29
  30     var $ns;
  31     var $path;
  32     var $argv;
  33
  34     function Platal()
  35     {
  36         $modules    = func_get_args();
  37         $this->path = trim(Get::_get('n', null), '/');
  38
  39         $this->__mods  = array();
  40         $this->__hooks = array();
  41
  42         array_unshift($modules, 'core');
  43         foreach ($modules as $module) {
  44             $this->__mods[$module] = $m = PLModule::factory($module);
  45             $this->__hooks += $m->handlers();
  46         }
  47     }
  48
  49     function pl_self($n = null)
  50     {
  51         if (is_null($n))
  52             return $this->path;
  53
  54         if ($n >= 0)
  55             return join('/', array_slice($this->argv, 0, $n + 1));
  56
  57         if ($n <= -count($this->argv))
  58             return $this->argv[0];
  59
  60         return join('/', array_slice($this->argv, 0, $n));
  61     }
  62
  63     function find_hook()
  64     {
  65         $p = $this->path;
  66
  67         while ($p) {
  68             if (array_key_exists($p, $this->__hooks))
  69                 break;
  70
  71             $p = substr($p, 0, strrpos($p, '/'));
  72         }
  73
  74         if (empty($this->__hooks[$p])) {
  75             return null;
  76         }
  77
  78         $hook = $this->__hooks[$p];
  79
  80         if (!is_callable($hook['hook'])) {
  81             return null;
  82         }
  83
  84         $this->argv    = explode('/', substr($this->path, strlen($p)));
  85         $this->argv[0] = $p;
  86
  87         return $hook;
  88     }
  89
  90     function find_nearest_key($key, &$array)
  91     {
  92         $keys    = array_keys($array);
  93         if (in_array($key, $keys)) {
  94             return $key;
  95         }
  96
  97         $has_end = in_array("#final#", $keys);
  98         if (strlen($key) > 24 && $has_end) {
  99             return "#final#";
 100         }
 101
 102         foreach ($keys as $k) {
 103             if ($k == "#final#") {
 104                 continue;
 105             }
 106             $lev = levenshtein($key, $k);
 107             if ((!isset($val) || $lev < $val) && $lev <= (strlen($k)*2)/3) {
 108                 $val  = $lev;
 109                 $best = $k;
 110             }
 111         }
 112         if (!isset($best) && $has_end) {
 113             return "#final#";
 114         } else {
 115             return $best;
 116         }
 117         return null;
 118     }
 119
 120     function near_hook()
 121     {
 122         $hooks = array();
 123         foreach ($this->__hooks as $hook=>$handler) {
 124             if (!empty($handler['perms']) && $handler['perms'] != S::v('perms')) {
 125                 continue;
 126             }
 127             $parts = split('/', $hook);
 128             $place =& $hooks;
 129             foreach ($parts as $part) {
 130                 if (!isset($place[$part])) {
 131                     $place[$part] = array();
 132                 }
 133                 $place =& $place[$part];
 134             }
 135             $place["#final#"] = array();
 136         }
 137
 138         $p = split('/', $this->path);
 139         $place =& $hooks;
 140         $link  = '';
 141         foreach ($p as $k) {
 142             if (!isset($ended)) {
 143                 $key = $this->find_nearest_key($k, $place);
 144             } else {
 145                 $key = $k;
 146             }
 147             if ($key == "#final#") {
 148                 if (!array_key_exists($link, $this->__hooks)) {
 149                     return null;
 150                 }
 151                 $key = $k;
 152                 $ended = true;
 153             }
 154             if (!is_null($key)) {
 155                 if (!empty($link)) {
 156                     $link .= '/';
 157                 }
 158                 $link .= $key;
 159                 $place =& $place[$key];
 160             } else {
 161                 return null;
 162             }
 163         }
 164         return $link;
 165     }
 166
 167     function call_hook(&$page)
 168     {
 169         $hook = $this->find_hook();
 170         if (empty($hook)) {
 171             return PL_NOT_FOUND;
 172         }
 173
 174         $args    = $this->argv;
 175         $args[0] = &$page;
 176
 177         if (!empty($hook['perms']) && $hook['perms'] != S::v('perms')) {
 178             return PL_FORBIDDEN;
 179         }
 180
 181         if ($hook['auth'] > S::v('auth', AUTH_PUBLIC)) {
 182             if ($hook['type'] == DO_AUTH) {
 183                 global $globals;
 184
 185                 if (!call_user_func(array($globals->session, 'doAuth'))) {
 186                     $this->force_login($page);
 187                 }
 188             } else {
 189                 return PL_FORBIDDEN;
 190             }
 191         }
 192
 193         return call_user_func_array($hook['hook'], $args);
 194     }
 195
 196     function force_login(&$page)
 197     {
 198         if (S::logged()) {
 199             $page->changeTpl('password_prompt_logged.tpl');
 200             $page->addJsLink('do_challenge_response_logged.js');
 201         } else {
 202             $page->changeTpl('password_prompt.tpl');
 203             $page->addJsLink('do_challenge_response.js');
 204         }
 205         $page->run();
 206     }
 207
 208     function run()
 209     {
 210         global $page;
 211
 212         new_skinned_page('index.tpl');
 213
 214         if (empty($this->path)) {
 215             $this->path = 'index';
 216         }
 217
 218         $page->assign('platal', $this);
 219         switch ($this->call_hook($page)) {
 220           case PL_FORBIDDEN:
 221             $this->__mods['core']->handler_403($page);
 222             break;
 223
 224           case PL_NOT_FOUND:
 225             $this->__mods['core']->handler_404($page);
 226             break;
 227         }
 228
 229         $page->assign('platal', $this);
 230         $page->run();
 231     }
 232
 233     function on_subscribe($forlife, $uid, $promo, $pass)
 234     {
 235         $args = func_get_args();
 236         foreach ($this->__mods as $mod) {
 237             if (!is_callable($mod, 'on_subscribe'))
 238                 continue;
 239             call_user_func_array(array($mod, 'on_subscribe'), $args);
 240         }
 241     }
 242 }
 243
 244 ?>