inc/libs/cache_functions.php

   1 <?php
   2 /************************************************************************
   3  * MXChange v0.2.1                                    Start: 10/11/2003 *
   4  * ===============                              Last change: 10/11/2003 *
   5  *                                                                      *
   6  * -------------------------------------------------------------------- *
   7  * File              : admins_functions.php                             *
   8  * -------------------------------------------------------------------- *
   9  * Short description : Functions for the admins extension               *
  10  * -------------------------------------------------------------------- *
  11  * Kurzbeschreibung  : Funktionen fuer die admins-Erweiterung           *
  12  * -------------------------------------------------------------------- *
  13  *                                                                      *
  14  * -------------------------------------------------------------------- *
  15  * Copyright (c) 2003 - 2008 by Roland Haeder                           *
  16  * For more information visit: http://www.mxchange.org                  *
  17  *                                                                      *
  18  * This program is free software; you can redistribute it and/or modify *
  19  * it under the terms of the GNU General Public License as published by *
  20  * the Free Software Foundation; either version 2 of the License, or    *
  21  * (at your option) any later version.                                  *
  22  *                                                                      *
  23  * This program is distributed in the hope that it will be useful,      *
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
  26  * GNU General Public License for more details.                         *
  27  *                                                                      *
  28  * You should have received a copy of the GNU General Public License    *
  29  * along with this program; if not, write to the Free Software          *
  30  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,               *
  31  * MA  02110-1301  USA                                                  *
  32  ************************************************************************/
  33
  34 // Some security stuff...
  35 if (ereg(basename(__FILE__), $_SERVER['PHP_SELF']))
  36 {
  37         $INC = substr(dirname(__FILE__), 0, strpos(dirname(__FILE__), "/inc") + 4) . "/security.php";
  38         require($INC);
  39 }
  40 // Caching class
  41 class mxchange_cache
  42 {
  43         // Define variables
  44         var $update_interval = 0;
  45         var $ret = "init";
  46         var $cache_path = "";
  47         var $cache_inc = "";
  48         var $cache_ctime = 0;
  49         var $cache_pointer = false;
  50
  51         // Constructor
  52         function mxchange_cache($interval, $path, $tested) {
  53                 // Remember interval in class
  54                 $this->update_interval=$interval;
  55
  56                 // Remeber path
  57                 $this->cache_path=$path;
  58
  59                 // Check if path exists
  60                 if ((file_exists($path)) && (is_dir($path)) && (!$tested))
  61                 {
  62                         // Check if we can create a file inside the path
  63                         @touch($path."dummy.tmp", 'w');
  64                         if (file_exists($path."dummy.tmp")) {
  65                                 // Yes, we can do. So let's remove it
  66                                 @unlink($path."dummy.tmp");
  67
  68                                 // Is there a .htaccess file?
  69                                 if (file_exists($path.".htaccess")) {
  70                                         // Update database that we have tested it
  71                                         UPDATE_CONFIG("cache_tested", 1);
  72
  73                                         // All done!
  74                                         return "done";
  75                                 } else {
  76                                         // Stop! Set a .htaccess file first
  77                                         $this->ret="htaccess";
  78                                         return "htaccess";
  79                                 }
  80                         }
  81                 } elseif ($tested) {
  82                         // System already tested
  83                         $this->ret="done";
  84                         return "done";
  85                 }
  86
  87                 // Something goes wrong here!
  88                 $this->ret="failed";
  89                 return "failed";
  90         }
  91
  92         function cache_file($file, $ignore_ctime=false)
  93         {
  94                 global $INC;
  95                 // Construct FQFN (full qualified file name)
  96                 $inc = $this->cache_path.$file.".cache";
  97
  98                 // Rember it + filename in class
  99                 $this->cache_inc = $inc;
 100
 101                 // Check if file exists
 102                 $status = (file_exists($inc) && (is_readable($inc)) && (is_writeable($inc)));
 103                 if ($status)
 104                 {
 105                         // Yes, it does. So let's get it's last changed date/time
 106                         $ctime = filectime($inc);
 107                 }
 108                 else
 109                 {
 110                         // No, it doesn't. Zero date/time
 111                         $ctime = "0";
 112                 }
 113
 114                 // Remember change date/time in class
 115                 $this->cache_ctime = $ctime;
 116
 117                 // Is the cache file outdated?
 118                 if (((time() - $ctime) >= $this->update_interval) && (!$ignore_ctime))
 119                 {
 120                         // Ok, we need an update!
 121                         $status = false;
 122                 }
 123                 return $status;
 124         }
 125
 126         function cache_init($array)
 127         {
 128                 // This will destory an existing cache file!
 129                 if ($this->ret == "done")
 130                 {
 131                         // Create file
 132                         if (file_exists($this->cache_inc)) @chmod($this->cache_inc, 0666);
 133                         $fp = @fopen($this->cache_inc, 'w') or mxchange_die("Cannot write to cache ".$this->cache_inc." !");
 134
 135                         // Begin of cache file
 136                         fwrite($fp, "\$ARRAY = \"".$array."\";\n\n");
 137
 138                         // Remember file pointer
 139                         $this->cache_pointer = $fp;
 140                 }
 141                 else
 142                 {
 143                         // Cannot create file
 144                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 145                 }
 146         }
 147
 148         function add_row ($data) {
 149                 global $cacheArray;
 150
 151                 if (is_resource($this->cache_pointer)) {
 152                         // Write every array element to cache file
 153                         foreach ($data as $k => $v) {
 154                                 // Write global cache array for immediate access
 155                                 if ((substr($k, 0, 4) == "ext_") && (isset($data['ext_name'])) && (isset($data['ext_id']))) {
 156                                         if ($k != "ext_name") {
 157                                                 $cacheArray['extensions'][$k][$data['ext_name']] = $v;
 158                                         } else {
 159                                                 $cacheArray['extensions'][$k][$data['ext_id']] = $v;
 160                                         }
 161                                         if (($k == "ext_keep") && ($v == "Y")) {
 162                                                 $cacheArray['active_extensions'][$data['ext_name']] = $v;
 163                                         } // END - if
 164                                 } // END - if
 165
 166                                 // Write cache line to file
 167                                 @fwrite($this->cache_pointer, "\$data['".$k."'][] = \"".$v."\";\n");
 168                         }
 169                 } else {
 170                         // Cannot create file
 171                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 172                 }
 173         }
 174
 175         function cache_close()
 176         {
 177                 // Quit function when no pointer is set
 178                 if (empty($this->cache_pointer)) return;
 179                 if ($this->cache_pointer)
 180                 {
 181                         // Close file add destroy handler
 182                         @fclose($this->cache_pointer);
 183
 184                         // Set rights
 185                         if (file_exists($this->cache_inc)) @chmod($this->cache_inc, 0666);
 186
 187                         // Remove pointer
 188                         unset($this->cache_pointer);
 189                 }
 190                 else
 191                 {
 192                         // Cannot create file
 193                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 194                 }
 195         }
 196
 197         function cache_load()
 198         {
 199                 if ((file_exists($this->cache_inc)) && (is_readable($this->cache_inc)))
 200                 {
 201                         // Prepare temporary array
 202                         $data = array();
 203
 204                         // Load cache file
 205                         $cache = implode("", file($this->cache_inc));
 206
 207                         // Execute cache file
 208                         eval($cache);
 209                         if (is_array($data)) {
 210                                 // Return cache
 211                                 return $data;
 212                         } else {
 213                                 // Cache problem detected!
 214                                 $this->cache_destroy();
 215                         }
 216                 }
 217                 else
 218                 {
 219                         // Cache file not found or not readable
 220                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_CANNOT_LOAD_1.$this->cache_inc.CACHE_CANNOT_LOAD_2);
 221                 }
 222         }
 223
 224         function cache_destroy()
 225         {
 226                 if (file_exists($this->cache_inc))
 227                 {
 228                         // Remove cache file from system
 229                         @unlink($this->cache_inc);
 230                         if (!file_exists($this->cache_inc))
 231                         {
 232                                 // Close cache automatically (we don't need it anymore!)
 233                                 $this->cache_close();
 234                         }
 235                         else
 236                         {
 237                                 // Not removed!
 238                                 ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_CANNOT_UNLINK_1.$this->cache_inc.CACHE_CANNOT_UNLINK_2);
 239                         }
 240                 }
 241                 else
 242                 {
 243                         // Does not exist!
 244                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_CANNOT_UNLINK_1.$this->cache_inc.CACHE_CANNOT_UNLINK_2);
 245                 }
 246         }
 247
 248         function cache_remove($search, $data, $array)
 249         {
 250                 global $ARRAY;
 251                 if ((file_exists($this->cache_inc)) && (is_writeable($this->cache_inc)))
 252                 {
 253                         // Load cache into dummy array
 254                         $dummy = $this->cache_load();
 255
 256                         // Search for key in array
 257                         $key = array_search($data, $dummy[$search]);
 258                         if (!empty($key))
 259                         {
 260                                 // Key (hopefully) found?
 261                                 foreach ($array as $a)
 262                                 {
 263                                         // So we can remove all elements as requested
 264                                         unset($dummy[$a][$key]);
 265                                 }
 266
 267                                 // Flush array to cache file
 268                                 $fp = fopen($this->cache_inc, 'w');
 269                                 fwrite($fp, "\$ARRAY = \"".$ARRAY."\";\n");
 270                                 foreach ($dummy as $k=>$v)
 271                                 {
 272                                         if (is_array($v))
 273                                         {
 274                                                 // Multi line(s) found
 275                                                 $LINE = "";
 276                                                 foreach($v as $k2=>$v2)
 277                                                 {
 278                                                         // Put every array element in a row...
 279                                                         $LINE .= "\$data['".$k."'][] = \"".$v2."\";\n";
 280                                                 }
 281                                         }
 282                                         else
 283                                         {
 284                                                 // Single line found
 285                                                 $LINE = "\$data['".$k."'] = \"".$v."\";\n";
 286                                         }
 287
 288                                         // Write line(s)
 289                                         fwrite($fp, $LINE);
 290                                 }
 291
 292                                 // Close cache file
 293                                 fclose($fp);
 294                         }
 295                 }
 296                 else
 297                 {
 298                         // Cannot write to cache!
 299                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 300                 }
 301         }
 302
 303         function cache_replace($search, $replace, $search_key, $array)
 304         {
 305                 global $ARRAY;
 306                 if ((file_exists($this->cache_inc)) && (is_writeable($this->cache_inc)))
 307                 {
 308                         // Load cache into dummy array
 309                         $dummy = $this->cache_load();
 310
 311                         // Check if $dummy is valid (prevents some errors)
 312                         if ((is_array($dummy)) && (isset($dummy[$search])) && (is_array($dummy[$search])))
 313                         {
 314                                 // Search for key in array
 315                                 $key_found = array_key_exists($search_key, $dummy[$search]);
 316                                 if ($key_found == true)
 317                                 {
 318                                         $key = $search_key;
 319                                         // Key (hopefully) found?
 320                                         foreach ($dummy as $a=>$v)
 321                                         {
 322                                                 // So we can update all entries
 323                                                 if ($a == $search)
 324                                                 {
 325                                                         // Update now...
 326                                                         $dummy[$a][$search_key] = $replace;
 327                                                 }
 328                                         }
 329
 330                                         // Flush array to cache file
 331                                         $fp = fopen($this->cache_inc, 'w');
 332                                         fwrite($fp, "\$dummy = \"".$ARRAY."\";\n");
 333                                         foreach ($dummy as $k=>$v)
 334                                         {
 335                                                 if (is_array($v))
 336                                                 {
 337                                                         // Multi line(s) found
 338                                                         $LINE = "";
 339                                                         foreach($v as $k2=>$v2)
 340                                                         {
 341                                                                 // Put every array element in a row...
 342                                                                 $LINE .= "\$data['".$k."'][] = \"".$v2."\";\n";
 343                                                         }
 344                                                 }
 345                                                 else
 346                                                 {
 347                                                         // Single line found
 348                                                         $LINE = "\$data['".$k."'] = \"".$v."\";\n";
 349                                                 }
 350
 351                                                 // Write line(s)
 352                                                 fwrite($fp, $LINE);
 353                                         }
 354
 355                                         // Close cache file
 356                                         fclose($fp);
 357                                 }
 358                         }
 359                 }
 360                 else
 361                 {
 362                         // Cannot write to cache!
 363                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 364                 }
 365         }
 366 }
 367 //
 368 ?>