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         var $cache_data = "";
  51         var $cache_version = "";
  52
  53         // Constructor
  54         function mxchange_cache($interval, $path, $tested) {
  55                 // Remember interval in class
  56                 $this->update_interval=$interval;
  57
  58                 // Remeber path
  59                 $this->cache_path=$path;
  60
  61                 // Check if path exists
  62                 if ((is_dir($path)) && (!$tested)) {
  63                         // Check if we can create a file inside the path
  64                         @touch($path."dummy.tmp", 'w');
  65                         if (FILE_READABLE($path."dummy.tmp")) {
  66                                 // Yes, we can do. So let's remove it
  67                                 @unlink($path."dummy.tmp");
  68
  69                                 // Is there a .htaccess file?
  70                                 if (FILE_READABLE($path.".htaccess")) {
  71                                         // Update database that we have tested it
  72                                         UPDATE_CONFIG("cache_tested", 1);
  73
  74                                         // All done!
  75                                         return "done";
  76                                 } else {
  77                                         // Stop! Set a .htaccess file first
  78                                         $this->ret="htaccess";
  79                                         return "htaccess";
  80                                 }
  81                         }
  82                 } elseif ($tested) {
  83                         // System already tested
  84                         $this->ret="done";
  85                         return "done";
  86                 }
  87
  88                 // Something goes wrong here!
  89                 $this->ret="failed";
  90                 return "failed";
  91         }
  92
  93         function cache_file($file, $ignore_ctime=false) {
  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                 $status = (FILE_READABLE($inc) && (is_writeable($inc)));
 103                 if ($status) {
 104                         // Yes, it does. So let's get it's last changed date/time
 105                         $ctime = filectime($inc);
 106                 } else {
 107                         // No, it doesn't. Zero date/time
 108                         $ctime = 0;
 109                 }
 110
 111                 // Remember change date/time in class
 112                 $this->cache_ctime = $ctime;
 113
 114                 // Is the cache file outdated?
 115                 if (((time() - $ctime) >= $this->update_interval) && (!$ignore_ctime)) {
 116                         // Ok, we need an update!
 117                         $status = false;
 118                 }
 119
 120                 // Return status
 121                 return $status;
 122         }
 123
 124         function cache_init($array) {
 125                 // This will destory an existing cache file!
 126                 if ($this->ret == "done") {
 127                         // Create file
 128                         if (FILE_READABLE($this->cache_inc)) @chmod($this->cache_inc, 0666);
 129                         $fp = @fopen($this->cache_inc, 'w') or mxchange_die("Cannot write to cache ".$this->cache_inc." !");
 130
 131                         // Begin of cache file
 132                         fwrite($fp, "\$ARRAY = \"".$array."\";\n\n");
 133
 134                         // Remember file pointer
 135                         $this->cache_pointer = $fp;
 136                 } else {
 137                         // Cannot create file
 138                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 139                 }
 140         }
 141
 142         function add_row ($data) {
 143                 global $cacheArray;
 144
 145                 if (is_resource($this->cache_pointer)) {
 146                         // Write every array element to cache file
 147                         foreach ($data as $k => $v) {
 148                                 // Write global cache array for immediate access
 149                                 if ((substr($k, 0, 4) == "ext_") && (isset($data['ext_name'])) && (isset($data['ext_id']))) {
 150                                         if ($k != "ext_name") {
 151                                                 $cacheArray['extensions'][$k][$data['ext_name']] = $v;
 152                                         } else {
 153                                                 $cacheArray['extensions'][$k][$data['ext_id']] = $v;
 154                                         }
 155                                         if (($k == "ext_keep") && ($v == "Y")) {
 156                                                 $cacheArray['active_extensions'][$data['ext_name']] = $v;
 157                                         } // END - if
 158                                 } // END - if
 159
 160                                 // Write cache line to file
 161                                 @fwrite($this->cache_pointer, $this->add_raw_row($k, $v));
 162                         }
 163                 } else {
 164                         // Cannot create file
 165                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 166                 }
 167         }
 168
 169         function cache_close()
 170         {
 171                 // Quit function when no pointer is set
 172                 if (empty($this->cache_pointer)) return;
 173                 if ($this->cache_pointer)
 174                 {
 175                         // Close file add destroy handler
 176                         @fclose($this->cache_pointer);
 177
 178                         // Set rights
 179                         if (FILE_READABLE($this->cache_inc)) @chmod($this->cache_inc, 0666);
 180
 181                         // Remove pointer
 182                         unset($this->cache_pointer);
 183                 }
 184                 else
 185                 {
 186                         // Cannot create file
 187                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 188                 }
 189         }
 190
 191         function cache_load() {
 192                 // Is the cache file there?
 193                 if (FILE_READABLE($this->cache_inc)) {
 194                         // Prepare temporary array
 195                         $data = array();
 196                         $cache_version = null;
 197
 198                         // Load cache file
 199                         $this->cache_data = implode("", file($this->cache_inc));
 200
 201                         // Execute cache file
 202                         eval($this->cache_data);
 203
 204                         if (is_array($data)) {
 205                                 // Cache data
 206                                 $this->cache_data = $data;
 207
 208                                 // Cache version found?
 209                                 if ((isset($cache_version)) && (is_array($cache_version))) {
 210                                         // Remember it as well...
 211                                         $this->cache_version = $cache_version;
 212                                 } // END - if
 213
 214                                 // Return cache
 215                                 return $this->cache_data;
 216                         } else {
 217                                 // Cache problem detected!
 218                                 $this->cache_destroy();
 219                         }
 220                 } else {
 221                         // Cache file not found or not readable
 222                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_CANNOT_LOAD_1.$this->cache_inc.CACHE_CANNOT_LOAD_2);
 223                 }
 224         }
 225
 226         function cache_destroy()
 227         {
 228                 if (FILE_READABLE($this->cache_inc))
 229                 {
 230                         // Remove cache file from system
 231                         @unlink($this->cache_inc);
 232                         if (!FILE_READABLE($this->cache_inc))
 233                         {
 234                                 // Close cache automatically (we don't need it anymore!)
 235                                 $this->cache_close();
 236                         }
 237                         else
 238                         {
 239                                 // Not removed!
 240                                 ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_CANNOT_UNLINK_1.$this->cache_inc.CACHE_CANNOT_UNLINK_2);
 241                         }
 242                 }
 243                 else
 244                 {
 245                         // Does not exist!
 246                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_CANNOT_UNLINK_1.$this->cache_inc.CACHE_CANNOT_UNLINK_2);
 247                 }
 248         }
 249
 250         function cache_remove($search, $data, $array)
 251         {
 252                 global $ARRAY;
 253                 if ((FILE_READABLE($this->cache_inc)) && (is_writeable($this->cache_inc))) {
 254                         // Load cache into dummy array
 255                         $dummy = $this->cache_load();
 256
 257                         // Search for key in array
 258                         $key = array_search($data, $dummy[$search]);
 259                         if (!empty($key)) {
 260                                 // Key (hopefully) found?
 261                                 foreach ($array as $a) {
 262                                         // So we can remove all elements as requested
 263                                         unset($dummy[$a][$key]);
 264                                 }
 265
 266                                 // Flush array to cache file
 267                                 $fp = fopen($this->cache_inc, 'w');
 268                                 fwrite($fp, "\$ARRAY = \"".$ARRAY."\";\n");
 269                                 foreach ($dummy as $k => $v) {
 270                                         if (is_array($v)) {
 271                                                 // Multi line(s) found
 272                                                 $LINE = "";
 273                                                 foreach($v as $k2 => $v2) {
 274                                                         // Put every array element in a row...
 275                                                         $LINE .= $this->add_raw_row($k, $v2);
 276                                                 }
 277                                         } else {
 278                                                 // Single line found
 279                                                 $LINE = $this->add_raw_row($k, $v);
 280                                         }
 281
 282                                         // Write line(s)
 283                                         fwrite($fp, $LINE);
 284                                 }
 285
 286                                 // Close cache file
 287                                 fclose($fp);
 288                         }
 289                 } else {
 290                         // Cannot write to cache!
 291                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 292                 }
 293         }
 294
 295         function cache_replace($search, $replace, $search_key, $array)
 296         {
 297                 global $ARRAY;
 298                 if ((FILE_READABLE($this->cache_inc)) && (is_writeable($this->cache_inc)))
 299                 {
 300                         // Load cache into dummy array
 301                         $dummy = $this->cache_load();
 302
 303                         // Check if $dummy is valid (prevents some errors)
 304                         if ((is_array($dummy)) && (isset($dummy[$search])) && (is_array($dummy[$search]))) {
 305                                 // Search for key in array
 306                                 $key_found = array_key_exists($search_key, $dummy[$search]);
 307                                 if ($key_found == true) {
 308                                         $key = $search_key;
 309                                         // Key (hopefully) found?
 310                                         foreach ($dummy as $a => $v) {
 311                                                 // So we can update all entries
 312                                                 if ($a == $search) {
 313                                                         // Update now...
 314                                                         $dummy[$a][$search_key] = $replace;
 315                                                 }
 316                                         }
 317
 318                                         // Flush array to cache file
 319                                         $fp = fopen($this->cache_inc, 'w');
 320                                         fwrite($fp, "\$dummy = \"".$ARRAY."\";\n");
 321                                         foreach ($dummy as $k => $v) {
 322                                                 if (is_array($v)) {
 323                                                         // Multi line(s) found
 324                                                         $LINE = "";
 325                                                         foreach($v as $k2 => $v2) {
 326                                                                 // Put every array element in a row...
 327                                                                 $LINE .= $this->add_raw_row($k, $v2);
 328                                                         }
 329                                                 } else {
 330                                                         // Single line found
 331                                                         $LINE = $this->add_raw_row($k, $v);
 332                                                 }
 333
 334                                                 // Write line(s)
 335                                                 fwrite($fp, $LINE);
 336                                         }
 337
 338                                         // Close cache file
 339                                         fclose($fp);
 340                                 }
 341                         }
 342                 } else {
 343                         // Cannot write to cache!
 344                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 345                 }
 346         }
 347
 348         function store_extension_version ($ext_name) {
 349                 // Valid cache pointer?
 350                 if (is_resource($this->cache_pointer)) {
 351                         // Get extension version
 352                         $ext_ver = GET_EXT_VERSION($ext_name);
 353
 354                         // Write cache line to file
 355                         @fwrite($this->cache_pointer, "\$cache_version['".$ext_name."'] = \"".$ext_ver."\";\n");
 356                 } else {
 357                         // Cannot create file
 358                         ADD_FATAL(__FILE__."(".__LINE__."): ".CACHE_PROBLEMS_DETECTED);
 359                 }
 360         }
 361
 362         function ext_version_matches ($ext_name) {
 363                 // Load cache (dummy)
 364                 $this->cache_load();
 365
 366                 // Get extension version
 367                 $ext_ver = GET_EXT_VERSION($ext_name);
 368
 369                 //* DEBUG: */ echo __METHOD__.": ext_name={$ext_name},ext_ver={$ext_ver},cache_version={$this->cache_version}<br />\n";
 370                 // Compare both
 371                 return ((isset($this->cache_version[$ext_name])) && ($this->cache_version[$ext_name] == $ext_ver));
 372         }
 373
 374         function add_raw_row ($key, $value) {
 375                 // Init line
 376                 $line = "";
 377
 378                 // String or non-string? ;-)
 379                 if (is_string($value)) {
 380                         // String...
 381                         $line = "\$data['".$key."'][] = \"".$value."\";\n";
 382                 } else {
 383                         // Non-string
 384                         $line = "\$data['".$key."'][] = ".$value.";\n";
 385                 }
 386
 387                 // Return line
 388                 return $line;
 389         }
 390 }
 391 //
 392 ?>