1 | <?php |
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2 | // +-----------------------------------------------------------------------+ |
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3 | // | PhpWebGallery - a PHP based picture gallery | |
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4 | // | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net | |
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5 | // | Copyright (C) 2003-2005 PhpWebGallery Team - http://phpwebgallery.net | |
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6 | // +-----------------------------------------------------------------------+ |
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7 | // | branch : BSF (Best So Far) |
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8 | // | file : $RCSfile$ |
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9 | // | last update : $Date: 2006-01-25 00:47:31 +0000 (Wed, 25 Jan 2006) $ |
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10 | // | last modifier : $Author: rvelices $ |
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11 | // | revision : $Revision: 1013 $ |
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12 | // +-----------------------------------------------------------------------+ |
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13 | // | This program is free software; you can redistribute it and/or modify | |
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14 | // | it under the terms of the GNU General Public License as published by | |
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15 | // | the Free Software Foundation | |
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16 | // | | |
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17 | // | This program is distributed in the hope that it will be useful, but | |
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18 | // | WITHOUT ANY WARRANTY; without even the implied warranty of | |
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19 | // | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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20 | // | General Public License for more details. | |
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21 | // | | |
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22 | // | You should have received a copy of the GNU General Public License | |
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23 | // | along with this program; if not, write to the Free Software | |
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24 | // | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
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25 | // | USA. | |
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26 | // +-----------------------------------------------------------------------+ |
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27 | |
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28 | // The function generate_key creates a string with pseudo random characters. |
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29 | // the size of the string depends on the $conf['session_id_size']. |
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30 | // Characters used are a-z A-Z and numerical values. Examples : |
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31 | // "Er4Tgh6", "Rrp08P", "54gj" |
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32 | // input : none (using global variable) |
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33 | // output : $key |
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34 | function generate_key($size) |
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35 | { |
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36 | global $conf; |
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37 | |
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38 | $md5 = md5(substr(microtime(), 2, 6)); |
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39 | $init = ''; |
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40 | for ( $i = 0; $i < strlen( $md5 ); $i++ ) |
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41 | { |
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42 | if ( is_numeric( $md5[$i] ) ) $init.= $md5[$i]; |
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43 | } |
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44 | $init = substr( $init, 0, 8 ); |
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45 | mt_srand( $init ); |
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46 | $key = ''; |
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47 | for ( $i = 0; $i < $size; $i++ ) |
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48 | { |
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49 | $c = mt_rand( 0, 2 ); |
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50 | if ( $c == 0 ) $key .= chr( mt_rand( 65, 90 ) ); |
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51 | else if ( $c == 1 ) $key .= chr( mt_rand( 97, 122 ) ); |
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52 | else $key .= mt_rand( 0, 9 ); |
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53 | } |
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54 | return $key; |
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55 | } |
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56 | |
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57 | if (isset($conf['session_save_handler']) |
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58 | and ($conf['session_save_handler'] == 'db') |
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59 | and defined('PHPWG_INSTALLED')) |
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60 | { |
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61 | session_set_save_handler('pwg_session_open', |
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62 | 'pwg_session_close', |
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63 | 'pwg_session_read', |
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64 | 'pwg_session_write', |
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65 | 'pwg_session_destroy', |
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66 | 'pwg_session_gc' |
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67 | ); |
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68 | } |
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69 | |
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70 | ini_set('session.use_cookies', $conf['session_use_cookies']); |
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71 | ini_set('session.use_only_cookies', $conf['session_use_only_cookies']); |
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72 | ini_set('session.use_trans_sid', intval($conf['session_use_trans_sid'])); |
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73 | ini_set('session.name', $conf['session_name']); |
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74 | |
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75 | /** |
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76 | * returns true; used when the session_start() function is called |
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77 | * |
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78 | * @params not use but useful for php engine |
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79 | */ |
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80 | function pwg_session_open($path, $name) |
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81 | { |
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82 | return true; |
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83 | } |
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84 | |
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85 | /** |
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86 | * returns true; used when the session is closed (unset($_SESSION)) |
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87 | * |
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88 | */ |
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89 | function pwg_session_close() |
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90 | { |
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91 | pwg_session_gc(); |
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92 | return true; |
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93 | } |
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94 | |
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95 | /** |
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96 | * this function returns |
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97 | * a string corresponding to the value of the variable save in the session |
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98 | * or an empty string when the variable doesn't exist |
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99 | * |
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100 | * @param string session id |
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101 | */ |
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102 | function pwg_session_read($session_id) |
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103 | { |
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104 | $query = ' |
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105 | SELECT data |
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106 | FROM '.SESSIONS_TABLE.' |
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107 | WHERE id = \''.$session_id.'\' |
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108 | ;'; |
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109 | $result = pwg_query($query); |
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110 | if ($result) |
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111 | { |
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112 | $row = mysql_fetch_assoc($result); |
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113 | return $row['data']; |
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114 | } |
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115 | else |
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116 | { |
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117 | return ''; |
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118 | } |
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119 | } |
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120 | |
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121 | /** |
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122 | * returns true; writes set a variable in the active session |
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123 | * |
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124 | * @param string session id |
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125 | * @data string value of date to be saved |
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126 | */ |
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127 | function pwg_session_write($session_id, $data) |
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128 | { |
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129 | $query = ' |
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130 | SELECT id |
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131 | FROM '.SESSIONS_TABLE.' |
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132 | WHERE id = \''.$session_id.'\' |
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133 | ;'; |
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134 | $result = pwg_query($query); |
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135 | if (mysql_num_rows($result)) |
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136 | { |
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137 | $query = ' |
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138 | UPDATE '.SESSIONS_TABLE.' |
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139 | SET expiration = now() |
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140 | WHERE id = \''.$session_id.'\' |
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141 | ;'; |
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142 | pwg_query($query); |
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143 | } |
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144 | else |
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145 | { |
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146 | $query = ' |
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147 | INSERT INTO '.SESSIONS_TABLE.' |
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148 | (id,data,expiration) |
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149 | VALUES(\''.$session_id.'\',\''.$data.'\',now()) |
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150 | ;'; |
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151 | pwg_query($query); |
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152 | } |
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153 | return true; |
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154 | } |
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155 | |
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156 | /** |
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157 | * returns true; delete the active session |
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158 | * |
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159 | * @param string session id |
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160 | */ |
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161 | function pwg_session_destroy($session_id) |
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162 | { |
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163 | $query = ' |
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164 | DELETE |
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165 | FROM '.SESSIONS_TABLE.' |
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166 | WHERE id = \''.$session_id.'\' |
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167 | ;'; |
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168 | pwg_query($query); |
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169 | return true; |
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170 | } |
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171 | |
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172 | /** |
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173 | * returns true; delete expired sessions |
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174 | * called each time a session is closed. |
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175 | */ |
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176 | function pwg_session_gc() |
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177 | { |
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178 | global $conf; |
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179 | |
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180 | $query = ' |
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181 | DELETE |
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182 | FROM '.SESSIONS_TABLE.' |
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183 | WHERE UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(expiration) > ' |
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184 | .$conf['session_length'].' |
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185 | ;'; |
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186 | pwg_query($query); |
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187 | return true; |
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188 | } |
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189 | ?> |
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