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         $val  = null;
  97         $best = null;
  98         foreach ($keys as $k) {
  99             $lev = levenshtein($key, $k);
 100             if ((is_null($val) || $lev < $val) && $lev < strlen($k)/2) {
 101                 $val  = $lev;
 102                 $best = $k;
 103             }
 104         }
 105         if (is_null($best) && in_array("#final#", $keys)) {
 106             return "#final#";
 107         } else {
 108             return $best;
 109         }
 110         return null;
 111     }
 112
 113     function near_hook()
 114     {
 115         $hooks = array();
 116         foreach ($this->__hooks as $hook=>$handler) {
 117             $parts = split('/', $hook);
 118             $place =& $hooks;
 119             foreach ($parts as $part) {
 120                 if (!isset($place[$part])) {
 121                     $place[$part] = array();
 122                 }
 123                 $place =& $place[$part];
 124             }
 125             $place["#final#"] = array();
 126         }
 127
 128         $p = split('/', $this->path);
 129         $place =& $hooks;
 130         $link  = '';
 131         $ended = false;
 132         foreach ($p as $k) {
 133             if (!$ended) {
 134                 $key = $this->find_nearest_key($k, $place);
 135             } else {
 136                 $key = $k;
 137             }
 138             if ($key == "#final#") {
 139                 $key = $k;
 140                 $ended = true;
 141                 if (!array_key_exists($link, $this->__hooks)) {
 142                     return null;
 143                 }
 144             }
 145             if (!is_null($key)) {
 146                 if (!empty($link)) {
 147                     $link .= '/';
 148                 }
 149                 $link .= $key;
 150                 $place =& $place[$key];
 151             } else {
 152                 return null;
 153             }
 154         }
 155         return $link;
 156     }
 157
 158     function call_hook(&$page)
 159     {
 160         $hook = $this->find_hook();
 161         if (empty($hook)) {
 162             return PL_NOT_FOUND;
 163         }
 164
 165         $args    = $this->argv;
 166         $args[0] = &$page;
 167
 168         if (strlen($hook['perms']) && $hook['perms'] != Session::v('perms')) {
 169             return PL_FORBIDDEN;
 170         }
 171
 172         if ($hook['auth'] > S::v('auth', AUTH_PUBLIC)) {
 173             if ($hook['type'] == DO_AUTH) {
 174                 global $globals;
 175
 176                 if (!call_user_func(array($globals->session, 'doAuth'))) {
 177                     $this->force_login($page);
 178                 }
 179             } else {
 180                 return PL_FORBIDDEN;
 181             }
 182         }
 183
 184         return call_user_func_array($hook['hook'], $args);
 185     }
 186
 187     function force_login(&$page)
 188     {
 189         if (S::logged()) {
 190             $page->changeTpl('password_prompt_logged.tpl');
 191             $page->addJsLink('do_challenge_response_logged.js');
 192         } else {
 193             $page->changeTpl('password_prompt.tpl');
 194             $page->addJsLink('do_challenge_response.js');
 195         }
 196         $page->run();
 197     }
 198
 199     function run()
 200     {
 201         global $page;
 202
 203         new_skinned_page('index.tpl');
 204
 205         if (empty($this->path)) {
 206             $this->path = 'index';
 207         }
 208
 209         $page->assign('platal', $this);
 210         switch ($this->call_hook($page)) {
 211           case PL_FORBIDDEN:
 212             $this->__mods['core']->handler_403($page);
 213             break;
 214
 215           case PL_NOT_FOUND:
 216             $this->__mods['core']->handler_404($page);
 217             break;
 218         }
 219
 220         $page->assign('platal', $this);
 221         $page->run();
 222     }
 223
 224     function on_subscribe($forlife, $uid, $promo, $pass)
 225     {
 226         $args = func_get_args();
 227         foreach ($this->__mods as $mod) {
 228             if (!is_callable($mod, 'on_subscribe'))
 229                 continue;
 230             call_user_func_array(array($mod, 'on_subscribe'), $args);
 231         }
 232     }
 233 }
 234
 235 ?>