1 | <?php |
---|
2 | // +-----------------------------------------------------------------------+ |
---|
3 | // | PhpWebGallery - a PHP based picture gallery | |
---|
4 | // | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net | |
---|
5 | // | Copyright (C) 2003-2005 PhpWebGallery Team - http://phpwebgallery.net | |
---|
6 | // +-----------------------------------------------------------------------+ |
---|
7 | // | branch : BSF (Best So Far) |
---|
8 | // | file : $RCSfile$ |
---|
9 | // | last update : $Date: 2007-03-12 22:33:53 +0000 (Mon, 12 Mar 2007) $ |
---|
10 | // | last modifier : $Author: rub $ |
---|
11 | // | revision : $Revision: 1900 $ |
---|
12 | // +-----------------------------------------------------------------------+ |
---|
13 | // | This program is free software; you can redistribute it and/or modify | |
---|
14 | // | it under the terms of the GNU General Public License as published by | |
---|
15 | // | the Free Software Foundation | |
---|
16 | // | | |
---|
17 | // | This program is distributed in the hope that it will be useful, but | |
---|
18 | // | WITHOUT ANY WARRANTY; without even the implied warranty of | |
---|
19 | // | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
---|
20 | // | General Public License for more details. | |
---|
21 | // | | |
---|
22 | // | You should have received a copy of the GNU General Public License | |
---|
23 | // | along with this program; if not, write to the Free Software | |
---|
24 | // | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
---|
25 | // | USA. | |
---|
26 | // +-----------------------------------------------------------------------+ |
---|
27 | |
---|
28 | // The function generate_key creates a string with pseudo random characters. |
---|
29 | // the size of the string depends on the $conf['session_id_size']. |
---|
30 | // Characters used are a-z A-Z and numerical values. Examples : |
---|
31 | // "Er4Tgh6", "Rrp08P", "54gj" |
---|
32 | // input : none (using global variable) |
---|
33 | // output : $key |
---|
34 | function generate_key($size) |
---|
35 | { |
---|
36 | global $conf; |
---|
37 | |
---|
38 | $md5 = md5(substr(microtime(), 2, 6)); |
---|
39 | $init = ''; |
---|
40 | for ( $i = 0; $i < strlen( $md5 ); $i++ ) |
---|
41 | { |
---|
42 | if ( is_numeric( $md5[$i] ) ) $init.= $md5[$i]; |
---|
43 | } |
---|
44 | $init = substr( $init, 0, 8 ); |
---|
45 | mt_srand( $init ); |
---|
46 | $key = ''; |
---|
47 | for ( $i = 0; $i < $size; $i++ ) |
---|
48 | { |
---|
49 | $c = mt_rand( 0, 2 ); |
---|
50 | if ( $c == 0 ) $key .= chr( mt_rand( 65, 90 ) ); |
---|
51 | else if ( $c == 1 ) $key .= chr( mt_rand( 97, 122 ) ); |
---|
52 | else $key .= mt_rand( 0, 9 ); |
---|
53 | } |
---|
54 | return $key; |
---|
55 | } |
---|
56 | |
---|
57 | if (isset($conf['session_save_handler']) |
---|
58 | and ($conf['session_save_handler'] == 'db') |
---|
59 | and defined('PHPWG_INSTALLED')) |
---|
60 | { |
---|
61 | session_set_save_handler('pwg_session_open', |
---|
62 | 'pwg_session_close', |
---|
63 | 'pwg_session_read', |
---|
64 | 'pwg_session_write', |
---|
65 | 'pwg_session_destroy', |
---|
66 | 'pwg_session_gc' |
---|
67 | ); |
---|
68 | if ( function_exists('ini_set') ) |
---|
69 | { |
---|
70 | ini_set('session.use_cookies', $conf['session_use_cookies']); |
---|
71 | ini_set('session.use_only_cookies', $conf['session_use_only_cookies']); |
---|
72 | ini_set('session.use_trans_sid', intval($conf['session_use_trans_sid'])); |
---|
73 | } |
---|
74 | session_name($conf['session_name']); |
---|
75 | session_set_cookie_params(0, cookie_path()); |
---|
76 | } |
---|
77 | |
---|
78 | // cookie_path returns the path to use for the PhpWebGallery cookie. |
---|
79 | // If PhpWebGallery is installed on : |
---|
80 | // http://domain.org/meeting/gallery/category.php |
---|
81 | // cookie_path will return : "/meeting/gallery" |
---|
82 | function cookie_path() |
---|
83 | { |
---|
84 | if ( isset($_SERVER['REDIRECT_SCRIPT_NAME']) and |
---|
85 | !empty($_SERVER['REDIRECT_SCRIPT_NAME']) ) |
---|
86 | { |
---|
87 | $scr = $_SERVER['REDIRECT_SCRIPT_NAME']; |
---|
88 | } |
---|
89 | else if ( isset($_SERVER['REDIRECT_URL']) ) |
---|
90 | { // mod_rewrite is activated for upper level directories. we must set the |
---|
91 | // cookie to the path shown in the browser otherwise it will be discarded. |
---|
92 | if ( isset($_SERVER['PATH_INFO']) and !empty($_SERVER['PATH_INFO']) ) |
---|
93 | { |
---|
94 | $idx = strpos( $_SERVER['REDIRECT_URL'], $_SERVER['PATH_INFO'] ); |
---|
95 | if ($idx !== false) |
---|
96 | { |
---|
97 | $scr = substr($_SERVER['REDIRECT_URL'], 0, $idx); |
---|
98 | } |
---|
99 | else |
---|
100 | {//this should never happen |
---|
101 | $scr='//'; |
---|
102 | } |
---|
103 | } |
---|
104 | else |
---|
105 | { |
---|
106 | $scr = $_SERVER['REDIRECT_URL']; |
---|
107 | } |
---|
108 | } |
---|
109 | else |
---|
110 | { |
---|
111 | $scr = $_SERVER['SCRIPT_NAME']; |
---|
112 | } |
---|
113 | $scr = substr($scr,0,strrpos( $scr,'/')); |
---|
114 | |
---|
115 | // add a trailing '/' if needed |
---|
116 | $scr .= ($scr{strlen($scr)-1} == '/') ? '' : '/'; |
---|
117 | |
---|
118 | if ( substr(PHPWG_ROOT_PATH,0,3)=='../') |
---|
119 | { // this is maybe a plugin inside pwg directory |
---|
120 | // TODO - what if it is an external script outside PWG ? |
---|
121 | $scr = $scr.PHPWG_ROOT_PATH; |
---|
122 | while (1) |
---|
123 | { |
---|
124 | $new = preg_replace('#[^/]+/\.\.(/|$)#', '', $scr); |
---|
125 | if ($new==$scr) |
---|
126 | { |
---|
127 | break; |
---|
128 | } |
---|
129 | $scr=$new; |
---|
130 | } |
---|
131 | } |
---|
132 | return $scr; |
---|
133 | } |
---|
134 | |
---|
135 | /** |
---|
136 | * returns true; used when the session_start() function is called |
---|
137 | * |
---|
138 | * @params not use but useful for php engine |
---|
139 | */ |
---|
140 | function pwg_session_open($path, $name) |
---|
141 | { |
---|
142 | return true; |
---|
143 | } |
---|
144 | |
---|
145 | /** |
---|
146 | * returns true; used when the session is closed (unset($_SESSION)) |
---|
147 | * |
---|
148 | */ |
---|
149 | function pwg_session_close() |
---|
150 | { |
---|
151 | return true; |
---|
152 | } |
---|
153 | |
---|
154 | /** |
---|
155 | * this function returns |
---|
156 | * a string corresponding to the value of the variable save in the session |
---|
157 | * or an empty string when the variable doesn't exist |
---|
158 | * |
---|
159 | * @param string session id |
---|
160 | */ |
---|
161 | function pwg_session_read($session_id) |
---|
162 | { |
---|
163 | $query = ' |
---|
164 | SELECT data |
---|
165 | FROM '.SESSIONS_TABLE.' |
---|
166 | WHERE id = \''.$session_id.'\' |
---|
167 | ;'; |
---|
168 | $result = pwg_query($query); |
---|
169 | if ($result) |
---|
170 | { |
---|
171 | $row = mysql_fetch_assoc($result); |
---|
172 | return $row['data']; |
---|
173 | } |
---|
174 | else |
---|
175 | { |
---|
176 | return ''; |
---|
177 | } |
---|
178 | } |
---|
179 | |
---|
180 | /** |
---|
181 | * returns true; writes set a variable in the active session |
---|
182 | * |
---|
183 | * @param string session id |
---|
184 | * @data string value of date to be saved |
---|
185 | */ |
---|
186 | function pwg_session_write($session_id, $data) |
---|
187 | { |
---|
188 | $query = ' |
---|
189 | UPDATE '.SESSIONS_TABLE.' |
---|
190 | SET expiration = now(), |
---|
191 | data = \''.$data.'\' |
---|
192 | WHERE id = \''.$session_id.'\' |
---|
193 | ;'; |
---|
194 | pwg_query($query); |
---|
195 | if ( mysql_affected_rows()>0 ) |
---|
196 | { |
---|
197 | return true; |
---|
198 | } |
---|
199 | $query = ' |
---|
200 | INSERT INTO '.SESSIONS_TABLE.' |
---|
201 | (id,data,expiration) |
---|
202 | VALUES(\''.$session_id.'\',\''.$data.'\',now()) |
---|
203 | ;'; |
---|
204 | mysql_query($query); |
---|
205 | return true; |
---|
206 | } |
---|
207 | |
---|
208 | /** |
---|
209 | * returns true; delete the active session |
---|
210 | * |
---|
211 | * @param string session id |
---|
212 | */ |
---|
213 | function pwg_session_destroy($session_id) |
---|
214 | { |
---|
215 | $query = ' |
---|
216 | DELETE |
---|
217 | FROM '.SESSIONS_TABLE.' |
---|
218 | WHERE id = \''.$session_id.'\' |
---|
219 | ;'; |
---|
220 | pwg_query($query); |
---|
221 | return true; |
---|
222 | } |
---|
223 | |
---|
224 | /** |
---|
225 | * returns true; delete expired sessions |
---|
226 | * called each time a session is closed. |
---|
227 | */ |
---|
228 | function pwg_session_gc() |
---|
229 | { |
---|
230 | global $conf; |
---|
231 | |
---|
232 | $query = ' |
---|
233 | DELETE |
---|
234 | FROM '.SESSIONS_TABLE.' |
---|
235 | WHERE UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(expiration) > ' |
---|
236 | .$conf['session_length'].' |
---|
237 | ;'; |
---|
238 | pwg_query($query); |
---|
239 | return true; |
---|
240 | } |
---|
241 | |
---|
242 | |
---|
243 | /** |
---|
244 | * persistently stores a variable for the current session |
---|
245 | * currently we use standard php sessions but it might change |
---|
246 | * @return boolean true on success |
---|
247 | * @see pwg_get_session_var, pwg_unset_session_var |
---|
248 | */ |
---|
249 | function pwg_set_session_var($var, $value) |
---|
250 | { |
---|
251 | if ( !isset($_SESSION) ) |
---|
252 | return false; |
---|
253 | $_SESSION['pwg_'.$var] = $value; |
---|
254 | return true; |
---|
255 | } |
---|
256 | |
---|
257 | /** |
---|
258 | * retrieves the value of a persistent variable for the current session |
---|
259 | * currently we use standard php sessions but it might change |
---|
260 | * @return mixed |
---|
261 | * @see pwg_set_session_var, pwg_unset_session_var |
---|
262 | */ |
---|
263 | function pwg_get_session_var($var, $default = null) |
---|
264 | { |
---|
265 | if (isset( $_SESSION['pwg_'.$var] ) ) |
---|
266 | { |
---|
267 | return $_SESSION['pwg_'.$var]; |
---|
268 | } |
---|
269 | return $default; |
---|
270 | } |
---|
271 | |
---|
272 | /** |
---|
273 | * deletes a persistent variable for the current session |
---|
274 | * currently we use standard php sessions but it might change |
---|
275 | * @return boolean true on success |
---|
276 | * @see pwg_set_session_var, pwg_get_session_var |
---|
277 | */ |
---|
278 | function pwg_unset_session_var($var) |
---|
279 | { |
---|
280 | if ( !isset($_SESSION) ) |
---|
281 | return false; |
---|
282 | unset( $_SESSION['pwg_'.$var] ); |
---|
283 | return true; |
---|
284 | } |
---|
285 | |
---|
286 | ?> |
---|