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     public $ns;
  32     public $path;
  33     public $argv;
  34
  35     public function __construct()
  36     {
  37         $modules    = func_get_args();
  38         if (is_array($modules[0])) {
  39             $modules = $modules[0];
  40         }
  41         $this->path = trim(Get::_get('n', null), '/');
  42
  43         $this->__mods  = array();
  44         $this->__hooks = array();
  45
  46         array_unshift($modules, 'core');
  47         foreach ($modules as $module) {
  48             $this->__mods[$module] = $m = PLModule::factory($module);
  49             $this->__hooks += $m->handlers();
  50         }
  51     }
  52
  53     public function pl_self($n = null)
  54     {
  55         if (is_null($n))
  56             return $this->path;
  57
  58         if ($n >= 0)
  59             return join('/', array_slice($this->argv, 0, $n + 1));
  60
  61         if ($n <= -count($this->argv))
  62             return $this->argv[0];
  63
  64         return join('/', array_slice($this->argv, 0, $n));
  65     }
  66
  67     protected function find_hook()
  68     {
  69         $p = $this->path;
  70
  71         while ($p) {
  72             if (array_key_exists($p, $this->__hooks))
  73                 break;
  74
  75             $p = substr($p, 0, strrpos($p, '/'));
  76         }
  77
  78         if (empty($this->__hooks[$p])) {
  79             return null;
  80         }
  81
  82         $hook = $this->__hooks[$p];
  83
  84         if (!is_callable($hook['hook'])) {
  85             return null;
  86         }
  87
  88         $this->argv    = explode('/', substr($this->path, strlen($p)));
  89         $this->argv[0] = $p;
  90
  91         return $hook;
  92     }
  93
  94     protected function find_nearest_key($key, array &$array)
  95     {
  96         $keys    = array_keys($array);
  97         if (in_array($key, $keys)) {
  98             return $key;
  99         }
 100
 101         if (($pos = strpos($key, '.php')) !== false) {
 102             $key = substr($key, 0, $pos);
 103         }
 104
 105         $has_end = in_array("#final#", $keys);
 106         if (strlen($key) > 24 && $has_end) {
 107             return "#final#";
 108         }
 109
 110         foreach ($keys as $k) {
 111             if ($k == "#final#") {
 112                 continue;
 113             }
 114             $lev = levenshtein($key, $k);
 115             if ((!isset($val) || $lev < $val) && $lev <= (strlen($k)*2)/3) {
 116                 $val  = $lev;
 117                 $best = $k;
 118             }
 119         }
 120         if (!isset($best) && $has_end) {
 121             return "#final#";
 122         } else {
 123             return $best;
 124         }
 125         return null;
 126     }
 127
 128     public function near_hook()
 129     {
 130         $hooks = array();
 131         foreach ($this->__hooks as $hook=>$handler) {
 132             if (!empty($handler['perms']) && $handler['perms'] != S::v('perms')) {
 133                 continue;
 134             }
 135             $parts = split('/', $hook);
 136             $place =& $hooks;
 137             foreach ($parts as $part) {
 138                 if (!isset($place[$part])) {
 139                     $place[$part] = array();
 140                 }
 141                 $place =& $place[$part];
 142             }
 143             $place["#final#"] = array();
 144         }
 145
 146         $p = split('/', $this->path);
 147         $place =& $hooks;
 148         $link  = '';
 149         foreach ($p as $k) {
 150             if (!isset($ended)) {
 151                 $key = $this->find_nearest_key($k, $place);
 152             } else {
 153                 $key = $k;
 154             }
 155             if ($key == "#final#") {
 156                 if (!array_key_exists($link, $this->__hooks)) {
 157                     return null;
 158                 }
 159                 $key = $k;
 160                 $ended = true;
 161             }
 162             if (!is_null($key)) {
 163                 if (!empty($link)) {
 164                     $link .= '/';
 165                 }
 166                 $link .= $key;
 167                 $place =& $place[$key];
 168             } else {
 169                 return null;
 170             }
 171         }
 172         if ($link != $this->path) {
 173             return $link;
 174         }
 175         return null;
 176     }
 177
 178     protected function check_perms($perms)
 179     {
 180         if (!$perms) { // No perms, no check
 181             return true;
 182         }
 183         $s_perms = S::v('perms');
 184         return $s_perms->hasFlagCombination($perms);
 185     }
 186
 187     private function call_hook(PlatalPage &$page)
 188     {
 189         $hook = $this->find_hook();
 190         if (empty($hook)) {
 191             return PL_NOT_FOUND;
 192         }
 193
 194         $args    = $this->argv;
 195         $args[0] = &$page;
 196
 197         if ($hook['auth'] > S::v('auth', AUTH_PUBLIC)) {
 198             if ($hook['type'] == DO_AUTH) {
 199                 global $globals;
 200
 201                 if (!call_user_func(array($globals->session, 'doAuth'))) {
 202                     $this->force_login($page);
 203                 }
 204             } else {
 205                 return PL_FORBIDDEN;
 206             }
 207         }
 208         if ($hook['auth'] != AUTH_PUBLIC && !$this->check_perms($hook['perms'])) {
 209             return PL_FORBIDDEN;
 210         }
 211
 212         $val = call_user_func_array($hook['hook'], $args);
 213         if ($val == PL_DO_AUTH) {
 214             global $globals;
 215             // The handler need a better auth with the current args
 216             if (!call_user_func(array($globals->session, 'doAuth'))) {
 217                 $this->force_login($page);
 218             }
 219             $val = call_user_func_array($hook['hook'], $args);
 220         }
 221         return $val;
 222     }
 223
 224     public function force_login(PlatalPage &$page)
 225     {
 226         if (S::logged()) {
 227             $page->changeTpl('core/password_prompt_logged.tpl');
 228             $page->addJsLink('do_challenge_response_logged.js');
 229         } else {
 230             $page->changeTpl('core/password_prompt.tpl');
 231             $page->addJsLink('do_challenge_response.js');
 232         }
 233         $page->assign('platal', $this);
 234         $page->run();
 235     }
 236
 237     public function run()
 238     {
 239         global $page;
 240
 241         new_skinned_page('platal/index.tpl');
 242
 243         if (empty($this->path)) {
 244             $this->path = 'index';
 245         }
 246
 247         $page->assign('platal', $this);
 248         switch ($this->call_hook($page)) {
 249           case PL_FORBIDDEN:
 250             $this->__mods['core']->handler_403($page);
 251             break;
 252
 253           case PL_NOT_FOUND:
 254             $this->__mods['core']->handler_404($page);
 255             break;
 256         }
 257
 258         $page->assign('platal', $this);
 259         $page->run();
 260     }
 261
 262     public function on_subscribe($forlife, $uid, $promo, $pass)
 263     {
 264         $args = func_get_args();
 265         foreach ($this->__mods as $mod) {
 266             if (!is_callable($mod, 'on_subscribe'))
 267                 continue;
 268             call_user_func_array(array($mod, 'on_subscribe'), $args);
 269         }
 270     }
 271 }
 272
 273 // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8:
 274 ?>