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 (!defined('__SECURITY')) {
  36         $INC = substr(dirname(__FILE__), 0, strpos(dirname(__FILE__), "/inc") + 4) . "/security.php";
  37         require($INC);
  38 }
  39
  40 // Caching class
  41 class CacheSystem {
  42         // Define variables
  43         var $ret = "init";
  44         var $path = "";
  45         var $inc = "";
  46         var $pointer = false;
  47         var $data = "";
  48         var $version = "";
  49         var $name = "";
  50         var $rebuilt = array();
  51
  52         // Constructor
  53         function CacheSystem ($interval, $path, $tested) {
  54                 // Failed is the default
  55                 $this->ret = "failed";
  56
  57                 // Remeber path
  58                 $this->path = $path;
  59
  60                 // Check if path exists
  61                 if ((is_dir($path)) && (!$tested)) {
  62                         // Check if we can create a file inside the path
  63                         touch($path."dummy.tmp", 'w');
  64                         if (FILE_READABLE($path."dummy.tmp")) {
  65                                 // Yes, we can do. So let's remove it
  66                                 unlink($path."dummy.tmp");
  67
  68                                 // Is there a .htaccess file?
  69                                 if (FILE_READABLE($path.".htaccess")) {
  70                                         // Update database that we have tested it
  71                                         UPDATE_CONFIG("cache_tested", 1);
  72
  73                                         // All done!
  74                                         $this->ret = "done";
  75                                 } else {
  76                                         // Stop! Set a .htaccess file first
  77                                         $this->ret = "htaccess";
  78                                 }
  79                         }
  80                 } elseif ($tested) {
  81                         // System already tested
  82                         $this->ret = "done";
  83                 }
  84         }
  85
  86         // Checks validity of cache file and if content is given
  87         function loadCacheFile ($file, $forceContent = false) {
  88                 // Remember cache file
  89                 $this->name = $file;
  90
  91                 // Construct FQFN (full qualified file name)
  92                 $this->inc = $this->path.$file.".cache";
  93
  94                 // Check if file exists and if version matches
  95                 $status = (FILE_READABLE($this->inc) && (is_writeable($this->inc)) && ($this->extensionVersionMatches("cache")));
  96
  97                 // Return status
  98                 return $status;
  99         }
 100
 101         function init () {
 102                 // This will destory an existing cache file!
 103                 if ($this->ret == "done") {
 104                         // Create file
 105                         if (FILE_READABLE($this->inc)) chmod($this->inc, 0666);
 106                         $this->pointer = fopen($this->inc, 'w') or mxchange_die("Cannot write to cache ".$this->inc." !");
 107
 108                         // Add open PHP tag
 109                         fwrite($this->pointer, "<?php\n");
 110
 111                         // Add default depency
 112                         $this->storeExtensionVersion("cache");
 113                 } else {
 114                         // Cannot create file
 115                         addFatalMessage(__FILE__."(<font color=\"#0000aa\">".__LINE__."</font>): ".CACHE_PROBLEMS_DETECTED);
 116                 }
 117         }
 118
 119         function addRow ($data) {
 120                 global $cacheArray;
 121
 122                 if (is_resource($this->pointer)) {
 123                         // Write every array element to cache file
 124                         foreach ($data as $k => $v) {
 125                                 // Write global cache array for immediate access
 126                                 if ((substr($k, 0, 4) == "ext_") && (isset($data['ext_name'])) && (isset($data['ext_id']))) {
 127                                         if ($k != "ext_name") {
 128                                                 $cacheArray['extensions'][$k][$data['ext_name']] = $v;
 129                                         } else {
 130                                                 $cacheArray['extensions'][$k][$data['ext_id']] = $v;
 131                                         }
 132                                         if (($k == "ext_keep") && ($v == "Y")) {
 133                                                 $cacheArray['active_extensions'][$data['ext_name']] = $v;
 134                                         } // END - if
 135                                 } elseif (is_array($v)) {
 136                                         // Serialize and BASE64-encode the array
 137                                         $v = base64_encode(serialize($v));
 138                                 }
 139
 140                                 // Write cache line to file
 141                                 fwrite($this->pointer, $this->rewriteEntry($k, $v));
 142                         }
 143                 } else {
 144                         // Cannot create file
 145                         addFatalMessage(__FILE__."(<font color=\"#0000aa\">".__LINE__."</font>): ".CACHE_PROBLEMS_DETECTED);
 146                 }
 147         }
 148
 149         function finalize () {
 150                 // Quit function when no pointer is set
 151                 if (is_resource($this->pointer)) {
 152                         // Write footer
 153                         fwrite($this->pointer, "?>\n");
 154
 155                         // Close file add destroy handler
 156                         fclose($this->pointer);
 157
 158                         // Set rights
 159                         if (FILE_READABLE($this->inc)) chmod($this->inc, 0666);
 160
 161                         // Remove pointer
 162                         $this->pointer = false;
 163                         //* DEBUG: */ print __METHOD__."(<font color=\"#0000aa\">".__LINE__."</font>): {$this->name} - FINALIZED!<br />\n";
 164                 } // END - if
 165         }
 166
 167         function getArrayFromCache () {
 168                 // Is the cache already loaded?
 169                 if (isset($this->data[$this->name])) {
 170                         // Return it's content!
 171                         return $this->data[$this->name];
 172                 } // END - if
 173
 174                 // Is the cache file there?
 175                 if (FILE_READABLE($this->inc)) {
 176                         // Prepare temporary array
 177                         $data = array();
 178                         $cache_version = null;
 179
 180                         // Load cache file
 181                         require_once($this->inc);
 182
 183                         // Is there an array?
 184                         if (is_array($data)) {
 185                                 // Cache data
 186                                 $this->data[$this->name] = $data;
 187
 188                                 // Cache version found?
 189                                 if ((is_array($cache_version)) && (count($cache_version) > 0)) {
 190                                         // Remember it as well...
 191                                         $this->version[$this->name] = $cache_version;
 192                                 } else {
 193                                         // Invalid cache so destroy it
 194                                         $this->destroyCacheFile();
 195
 196                                         // Clear cached data
 197                                         $this->data[$this->name] = array();
 198                                 }
 199
 200                                 // Return cache
 201                                 return $this->data[$this->name];
 202                         } else {
 203                                 // Cache problem detected!
 204                                 $this->destroyCacheFile();
 205                         }
 206                 } else {
 207                         // Cache file not found or not readable
 208                         addFatalMessage(__FILE__."(<font color=\"#0000aa\">".__LINE__."</font>): ".CACHE_CANNOT_LOAD_1.$this->inc.CACHE_CANNOT_LOAD_2);
 209                 }
 210         }
 211
 212         // Destroy an existing cache file
 213         function destroyCacheFile () {
 214                 // Is the cache file there?
 215                 if ((!isset($this->rebuilt[$this->name])) && (FILE_READABLE($this->inc))) {
 216                         // Close cache
 217                         $this->finalize();
 218
 219                         // Remove cache file from system
 220                         //* DEBUG: */ print __METHOD__."(<font color=\"#0000aa\">".__LINE__."</font>): {$this->name} - DESTROYED!<br />\n";
 221                         unlink($this->inc);
 222
 223                         // Is the file there?
 224                         if (!FILE_READABLE($this->inc)) {
 225                                 // The cache does no longer exist so kill the content
 226                                 unset($this->data[$this->name]);
 227                                 unset($this->version[$this->name]);
 228                                 $this->rebuilt[$this->name] = true;
 229                         } else {
 230                                 // Not removed!
 231                                 addFatalMessage(__FILE__."(<font color=\"#0000aa\">".__LINE__."</font>): ".CACHE_CANNOT_UNLINK_1.$this->inc.CACHE_CANNOT_UNLINK_2);
 232                         }
 233                 } // END - if
 234         }
 235
 236         // Unused method:
 237         function removeEntry ($search, $data, $array) {
 238                 if ((FILE_READABLE($this->inc)) && (is_writeable($this->inc))) {
 239                         // Load cache into dummy array
 240                         $dummy = $this->getArrayFromCache();
 241
 242                         // Search for key in array
 243                         $key = array_search($data, $dummy[$search]);
 244                         if (!empty($key)) {
 245                                 // Key (hopefully) found?
 246                                 foreach ($array as $a) {
 247                                         // So we can remove all elements as requested
 248                                         unset($dummy[$a][$key]);
 249                                 } // END - foreach
 250
 251                                 // Flush array to cache file
 252                                 $this->init();
 253
 254                                 // Write array out
 255                                 $this->writeArray($dummy);
 256
 257                                 // Close cache file
 258                                 $this->finalize();
 259                         }
 260                 } else {
 261                         // Cannot write to cache!
 262                         addFatalMessage(__FILE__."(<font color=\"#0000aa\">".__LINE__."</font>): ".CACHE_PROBLEMS_DETECTED);
 263                 }
 264         }
 265
 266         function writeArray ($array) {
 267                 if (is_resource($this->pointer)) {
 268                         foreach ($array as $k => $v) {
 269                                 if (is_array($v)) {
 270                                         // Multi line(s) found
 271                                         $LINE = "";
 272                                         foreach($v as $k2 => $v2) {
 273                                                 // Put every array element in a row...
 274                                                 $LINE .= $this->rewriteEntry($k, $v2);
 275                                         }
 276                                 } else {
 277                                         // Single line found
 278                                         $LINE = $this->rewriteEntry($k, $v);
 279                                 }
 280
 281                                 // Write line(s)
 282                                 fwrite($this->pointer, $LINE);
 283                         } // END - foreach
 284                 } else {
 285                         // Cannot write array!
 286                         addFatalMessage(__FILE__."(<font color=\"#0000aa\">".__LINE__."</font>): ".CACHE_PROBLEMS_DETECTED);
 287                 }
 288         }
 289
 290         // Unused method
 291         function replaceEntry ($search, $replace, $search_key, $array) {
 292                 if ((FILE_READABLE($this->inc)) && (is_writeable($this->inc))) {
 293                         // Load cache into dummy array
 294                         $dummy = $this->getArrayFromCache();
 295
 296                         // Check if $dummy is valid (prevents some errors)
 297                         if ((is_array($dummy)) && (isset($dummy[$search])) && (is_array($dummy[$search]))) {
 298                                 // Search for key in array
 299                                 $key_found = array_key_exists($search_key, $dummy[$search]);
 300                                 if ($key_found == true) {
 301                                         $key = $search_key;
 302                                         // Key (hopefully) found?
 303                                         foreach ($dummy as $a => $v) {
 304                                                 // So we can update all entries
 305                                                 if ($a == $search) {
 306                                                         // Update now...
 307                                                         $dummy[$a][$search_key] = $replace;
 308                                                 } // END - if
 309                                         } // END - foreach
 310
 311                                         // Flush array to cache file
 312                                         $this->init();
 313
 314                                         // Write array out
 315                                         $this->writeArray($dummy);
 316
 317                                         // Close cache file
 318                                         $this->finalize();
 319                                 } // END - if
 320                         } // END - if
 321                 } else {
 322                         // Cannot write to cache!
 323                         addFatalMessage(__FILE__."(<font color=\"#0000aa\">".__LINE__."</font>): ".CACHE_PROBLEMS_DETECTED);
 324                 }
 325         }
 326
 327         function storeExtensionVersion ($ext_name) {
 328                 // Valid cache pointer?
 329                 if (is_resource($this->pointer)) {
 330                         // Get extension version
 331                         $ext_ver = GET_EXT_VERSION($ext_name);
 332
 333                         // Write cache line to file
 334                         fwrite($this->pointer, "\$cache_version['".$ext_name."'] = \"".$ext_ver."\";\n");
 335
 336                         // Add the extension version to object (DO NOT REMOVE IT! Endless loop...)
 337                         $this->version[$this->name][$ext_name] = $ext_ver;
 338                         //* DEBUG: */ print __METHOD__."(<font color=\"#0000aa\">".__LINE__."</font>): {$this->name} - {$ext_name}={$ext_ver}<br />\n";
 339                 } else {
 340                         // Cannot create file
 341                         addFatalMessage(__FILE__."(<font color=\"#0000aa\">".__LINE__."</font>): ".CACHE_PROBLEMS_DETECTED);
 342                 }
 343         }
 344
 345         function extensionVersionMatches ($ext_name) {
 346                 // Load cache (dummy)
 347                 $this->getArrayFromCache();
 348
 349                 // Get extension version
 350                 $ext_ver = GET_EXT_VERSION($ext_name);
 351
 352                 // Debug messages
 353                 if (isset($this->version[$this->name][$ext_name])) {
 354                         //* DEBUG: */ print __METHOD__."(<font color=\"#0000aa\">".__LINE__."</font>): cache={$this->name},ext_name={$ext_name} - {$ext_ver}/{$this->version[$this->name][$ext_name]}<br />\n";
 355                 } else {
 356                         // No cache version found!
 357                         DEBUG_LOG(__METHOD__, __LINE__, "Cache {$this->name} has missing entry for extension {$ext_name}!");
 358                 }
 359
 360                 // Compare both
 361                 return ((isset($this->version[$this->name][$ext_name])) && ($this->version[$this->name][$ext_name] == $ext_ver));
 362         }
 363
 364         function rewriteEntry ($key, $value) {
 365                 // Init line
 366                 $line = "";
 367
 368                 // String or non-string? ;-)
 369                 if (is_string($value)) {
 370                         // String...
 371                         $line = "\$data['".$key."'][] = \"".$value."\";\n";
 372                 } elseif (is_null($value)) {
 373                         // Null
 374                         $line = "\$data['".$key."'][] = null;\n";
 375                 } elseif (is_bool($value)) {
 376                         // Boolean value
 377                         if ($value === true) {
 378                                 $line = "\$data['".$key."'][] = true;\n";
 379                         } else {
 380                                 $line = "\$data['".$key."'][] = false;\n";
 381                         }
 382                 } else {
 383                         // Non-string
 384                         $line = "\$data['".$key."'][] = ".$value.";\n";
 385                 }
 386
 387                 // Return line
 388                 return $line;
 389         }
 390
 391         function getStatus () {
 392                 return $this->ret;
 393         }
 394 }
 395
 396 // Destroy the cache on extension changes
 397 function FILTER_CACHE_DESTROY_ON_EXT_CHANGE ($data) {
 398         global $cacheInstance;
 399
 400         // Remove cache
 401         if (EXT_IS_ACTIVE("cache")) {
 402                 if ($cacheInstance->loadCacheFile("config"))     $cacheInstance->destroyCacheFile();
 403                 if ($cacheInstance->loadCacheFile("extensions")) $cacheInstance->destroyCacheFile();
 404                 if ($cacheInstance->loadCacheFile("mod_reg"))    $cacheInstance->destroyCacheFile();
 405         } // END - if
 406
 407         // Return it
 408         return $data;
 409 }
 410
 411 // Destroy the cache on changing admin
 412 function FILTER_CACHE_DESTROY_ON_ADMIN_CHANGE () {
 413         global $cacheInstance;
 414
 415         // Remove cache
 416         if (EXT_IS_ACTIVE("cache")) {
 417                 if ($cacheInstance->loadCacheFile("admins")) $cacheInstance->destroyCacheFile();
 418         } // END - if
 419 }
 420
 421 // Destroy all cache files
 422 function FILTER_CACHE_DESTROY_ALL () {
 423         global $cacheInstance;
 424
 425         // Remove cache
 426         if (EXT_IS_ACTIVE("cache")) {
 427                 if ($cacheInstance->loadCacheFile("admins"))      $cacheInstance->destroyCacheFile();
 428                 if ($cacheInstance->loadCacheFile("admins_acls")) $cacheInstance->destroyCacheFile();
 429                 if ($cacheInstance->loadCacheFile("config"))      $cacheInstance->destroyCacheFile();
 430                 if ($cacheInstance->loadCacheFile("extensions"))  $cacheInstance->destroyCacheFile();
 431                 if ($cacheInstance->loadCacheFile("mod_reg"))     $cacheInstance->destroyCacheFile();
 432                 if ($cacheInstance->loadCacheFile("refdepths"))   $cacheInstance->destroyCacheFile();
 433                 if ($cacheInstance->loadCacheFile("refsystem"))   $cacheInstance->destroyCacheFile();
 434                 if ($cacheInstance->loadCacheFile("themes"))      $cacheInstance->destroyCacheFile();
 435         } // END - if
 436 }
 437
 438 // Filter for purging entire admin menu cache
 439 function FILTER_CACHE_PURGE_ADMIN_MENU () {
 440         // Just call the function
 441         CACHE_PURGE_ADMIN_MENU();
 442 }
 443
 444 //
 445 ?>