functions/prefs.php

   1 <?php
   2
   3 /**
   4  * prefs.php
   5  *
   6  * Copyright (c) 1999-2002 The SquirrelMail Project Team
   7  * Licensed under the GNU GPL. For full terms see the file COPYING.
   8  *
   9  * This contains functions for manipulating user preferences
  10  *
  11  * $Id$
  12  */
  13
  14 require_once(SM_PATH . 'functions/global.php');
  15
  16 if (isset($_SESSION['prefs_cache'])) {
  17     $prefs_cache = $_SESSION['prefs_cache'];
  18 }
  19 if (isset($_SESSION['prefs_are_cached'])) {
  20     $prefs_are_cached = $_SESSION['prefs_are_cached'];
  21 }
  22
  23 $rg = ini_get('register_globals');
  24
  25 if ( !session_is_registered('prefs_are_cached') ||
  26      !isset( $prefs_cache) ||
  27      !is_array( $prefs_cache) ||
  28      substr( phpversion(), 0, 3 ) == '4.1' ||
  29      substr( phpversion(), 0, 3 ) == '4.2' ||
  30      (substr( phpversion(), 0, 3 ) == '4.0' && empty($rg))) {
  31     $prefs_are_cached = false;
  32     $prefs_cache = array();
  33 }
  34
  35 if (isset($prefs_dsn) && !empty($prefs_dsn)) {
  36     require_once(SM_PATH . 'functions/db_prefs.php');
  37 } else {
  38     require_once(SM_PATH . 'functions/file_prefs.php');
  39 }
  40
  41 /* Hashing functions */
  42
  43 function getHashedFile($username, $dir, $datafile, $hash_search = true) {
  44     global $dir_hash_level;
  45
  46     /* Remove trailing slash from $dir if found */
  47     if (substr($dir, -1) == '/') {
  48         $dir = substr($dir, 0, strlen($dir) - 1);
  49     }
  50
  51     /* Compute the hash for this user and extract the hash directories. */
  52     $hash_dirs = computeHashDirs($username);
  53
  54     /* First, get and make sure the full hash directory exists. */
  55     $real_hash_dir = getHashedDir($username, $dir, $hash_dirs);
  56
  57     /* Set the value of our real data file. */
  58     $result = "$real_hash_dir/$datafile";
  59
  60     /* Check for this file in the real hash directory. */
  61     if ($hash_search && !@file_exists($result)) {
  62         /* First check the base directory, the most common location. */
  63         if (@file_exists("$dir/$datafile")) {
  64             rename("$dir/$datafile", $result);
  65
  66         /* Then check the full range of possible hash directories. */
  67         } else {
  68             $check_hash_dir = $dir;
  69             for ($h = 0; $h < 4; ++$h) {
  70                 $check_hash_dir .= '/' . $hash_dirs[$h];
  71                 if (@is_readable("$check_hash_dir/$datafile")) {
  72                     rename("$check_hash_dir/$datafile", $result);
  73                     break;
  74                 }
  75             }
  76         }
  77     }
  78
  79     /* Return the full hashed datafile path. */
  80     return ($result);
  81 }
  82
  83 function getHashedDir($username, $dir, $hash_dirs = '') {
  84     global $dir_hash_level;
  85
  86     /* Remove trailing slash from $dir if found */
  87     if (substr($dir, -1) == '/') {
  88         $dir = substr($dir, 0, strlen($dir) - 1);
  89     }
  90
  91     /* If necessary, populate the hash dir variable. */
  92     if ($hash_dirs == '') {
  93         $hash_dirs = computeHashDirs($username);
  94     }
  95
  96     /* Make sure the full hash directory exists. */
  97     $real_hash_dir = $dir;
  98     for ($h = 0; $h < $dir_hash_level; ++$h) {
  99         $real_hash_dir .= '/' . $hash_dirs[$h];
 100         if (!@is_dir($real_hash_dir)) {
 101             if (!@mkdir($real_hash_dir, 0770)) {
 102                 echo sprintf(_("Error creating directory %s."), $real_hash_dir) . '<br>' .
 103                      _("Could not create hashed directory structure!") . "<br>\n" .
 104                      _("Please contact your system administrator and report this error.") . "<br>\n";
 105                 exit;
 106             }
 107         }
 108     }
 109
 110     /* And return that directory. */
 111     return ($real_hash_dir);
 112 }
 113
 114 function computeHashDirs($username) {
 115     /* Compute the hash for this user and extract the hash directories. */
 116     $hash = base_convert(crc32($username), 10, 16);
 117     $hash_dirs = array();
 118     for ($h = 0; $h < 4; ++ $h) {
 119         $hash_dirs[] = substr($hash, $h, 1);
 120     }
 121
 122     /* Return our array of hash directories. */
 123     return ($hash_dirs);
 124 }
 125
 126 ?>