1 | <?php |
---|
2 | /** |
---|
3 | * Prefs.inc.php |
---|
4 | * code by strangecode :: www.strangecode.com :: this document contains copyrighted information |
---|
5 | * |
---|
6 | * Prefs provides an API for saving arbitrary values in a user's session. |
---|
7 | * Session prefs can be stored into a database with the optional save() and load() methods. |
---|
8 | * |
---|
9 | * @author Quinn Comendant <quinn@strangecode.com> |
---|
10 | * @version 2.1 |
---|
11 | * |
---|
12 | * Example of use: |
---|
13 | --------------------------------------------------------------------- |
---|
14 | // Load preferences for the user. |
---|
15 | require_once 'codebase/lib/Prefs.inc.php'; |
---|
16 | $prefs = new Prefs('bURB'); |
---|
17 | $prefs->setParam(array( |
---|
18 | 'enable_db' => $auth->isLoggedIn(), |
---|
19 | 'user_id' => $auth->get('user_id'), |
---|
20 | )); |
---|
21 | $prefs->setDefaults(array( |
---|
22 | 'search_num_results' => 25, |
---|
23 | 'datalog_num_entries' => 25, |
---|
24 | )); |
---|
25 | $prefs->load(); |
---|
26 | --------------------------------------------------------------------- |
---|
27 | */ |
---|
28 | class Prefs { |
---|
29 | |
---|
30 | // Namespace of this instance of Prefs. |
---|
31 | var $_ns; |
---|
32 | |
---|
33 | // Configuration of this object. |
---|
34 | var $_params = array( |
---|
35 | |
---|
36 | // The current user_id for which to load/save preferences. |
---|
37 | 'user_id' => null, |
---|
38 | |
---|
39 | // How long before we force a reload of the prefs data? 3600 = once every hour. |
---|
40 | 'load_timeout' => 3600, |
---|
41 | |
---|
42 | // Enable database storage. |
---|
43 | 'enable_db' => true, |
---|
44 | |
---|
45 | // Name of database table to store prefs. |
---|
46 | 'db_table' => 'pref_tbl', |
---|
47 | |
---|
48 | // Automatically create table and verify columns. Better set to false after site launch. |
---|
49 | 'create_table' => true, |
---|
50 | ); |
---|
51 | |
---|
52 | /** |
---|
53 | * Prefs constructor. |
---|
54 | */ |
---|
55 | function Prefs($namespace='') |
---|
56 | { |
---|
57 | $app =& App::getInstance(); |
---|
58 | |
---|
59 | $this->_ns = '_prefs_' . $namespace; |
---|
60 | |
---|
61 | // Initialized the prefs array. |
---|
62 | if (!isset($_SESSION[$this->_ns]['data'])) { |
---|
63 | $this->clear(); |
---|
64 | } |
---|
65 | |
---|
66 | // Get create tables config from global context. |
---|
67 | if (!is_null($app->getParam('db_create_tables'))) { |
---|
68 | $this->setParam(array('create_table' => $app->getParam('db_create_tables'))); |
---|
69 | } |
---|
70 | } |
---|
71 | |
---|
72 | /** |
---|
73 | * Setup the database table for this class. |
---|
74 | * |
---|
75 | * @access public |
---|
76 | * @author Quinn Comendant <quinn@strangecode.com> |
---|
77 | * @since 04 Jun 2006 16:41:42 |
---|
78 | */ |
---|
79 | function initDB($recreate_db=false) |
---|
80 | { |
---|
81 | $app =& App::getInstance(); |
---|
82 | $db =& DB::getInstance(); |
---|
83 | |
---|
84 | static $_db_tested = false; |
---|
85 | |
---|
86 | if ($recreate_db || !$_db_tested && $this->getParam('create_table')) { |
---|
87 | if ($recreate_db) { |
---|
88 | $db->query("DROP TABLE IF EXISTS " . $this->getParam('db_table')); |
---|
89 | $app->logMsg(sprintf('Dropping and recreating table %s.', $this->getParam('db_table')), LOG_DEBUG, __FILE__, __LINE__); |
---|
90 | } |
---|
91 | $db->query("CREATE TABLE IF NOT EXISTS " . $db->escapeString($this->getParam('db_table')) . " ( |
---|
92 | user_id VARCHAR(32) NOT NULL DEFAULT '', |
---|
93 | pref_namespace VARCHAR(32) NOT NULL DEFAULT '', |
---|
94 | pref_key VARCHAR(64) NOT NULL DEFAULT '', |
---|
95 | pref_value TEXT, |
---|
96 | PRIMARY KEY (user_id, pref_namespace, pref_key) |
---|
97 | )"); |
---|
98 | |
---|
99 | if (!$db->columnExists($this->getParam('db_table'), array( |
---|
100 | 'user_id', |
---|
101 | 'pref_namespace', |
---|
102 | 'pref_key', |
---|
103 | 'pref_value', |
---|
104 | ), false, false)) { |
---|
105 | $app->logMsg(sprintf('Database table %s has invalid columns. Please update this table manually.', $this->getParam('db_table')), LOG_ALERT, __FILE__, __LINE__); |
---|
106 | trigger_error(sprintf('Database table %s has invalid columns. Please update this table manually.', $this->getParam('db_table')), E_USER_ERROR); |
---|
107 | } |
---|
108 | } |
---|
109 | $_db_tested = true; |
---|
110 | } |
---|
111 | |
---|
112 | /** |
---|
113 | * Set the params of this object. |
---|
114 | * |
---|
115 | * @param array $params Array of param keys and values to set. |
---|
116 | */ |
---|
117 | function setParam($params=null) |
---|
118 | { |
---|
119 | if (isset($params) && is_array($params)) { |
---|
120 | // Merge new parameters with old overriding only those passed. |
---|
121 | $this->_params = array_merge($this->_params, $params); |
---|
122 | } |
---|
123 | } |
---|
124 | |
---|
125 | /** |
---|
126 | * Return the value of a parameter, if it exists. |
---|
127 | * |
---|
128 | * @access public |
---|
129 | * @param string $param Which parameter to return. |
---|
130 | * @return mixed Configured parameter value. |
---|
131 | */ |
---|
132 | function getParam($param) |
---|
133 | { |
---|
134 | $app =& App::getInstance(); |
---|
135 | |
---|
136 | if (isset($this->_params[$param])) { |
---|
137 | return $this->_params[$param]; |
---|
138 | } else { |
---|
139 | $app->logMsg(sprintf('Parameter is not set: %s', $param), LOG_DEBUG, __FILE__, __LINE__); |
---|
140 | return null; |
---|
141 | } |
---|
142 | } |
---|
143 | |
---|
144 | /** |
---|
145 | * Sets the default value of a preference. The pref will be set only if |
---|
146 | * is not set already. |
---|
147 | * |
---|
148 | * @param string $key The name of the preference to modify. |
---|
149 | * @param string $val The new value for this preference. |
---|
150 | */ |
---|
151 | function setDefaults($defaults) |
---|
152 | { |
---|
153 | if (isset($defaults) && is_array($defaults)) { |
---|
154 | // Apply defaults to the session, setting only non-existing values. |
---|
155 | $_SESSION[$this->_ns]['data'] = array_merge($defaults, $_SESSION[$this->_ns]['data']); |
---|
156 | } |
---|
157 | } |
---|
158 | |
---|
159 | /** |
---|
160 | * Sets the given preferences to the specific value, |
---|
161 | * |
---|
162 | * @param string $key The name of the preference to modify. |
---|
163 | * @param string $val The new value for this preference. |
---|
164 | */ |
---|
165 | function set($key, $val) |
---|
166 | { |
---|
167 | if ('' != $key && '' != $val) { |
---|
168 | $_SESSION[$this->_ns]['data'][$key] = $val; |
---|
169 | } |
---|
170 | } |
---|
171 | |
---|
172 | /** |
---|
173 | * Returns the value of the requested preference. |
---|
174 | * |
---|
175 | * @param string $key The name of the preference to retrieve. |
---|
176 | * |
---|
177 | * @return string The value of the preference. |
---|
178 | */ |
---|
179 | function get($key) |
---|
180 | { |
---|
181 | return (isset($_SESSION[$this->_ns]['data'][$key])) ? $_SESSION[$this->_ns]['data'][$key] : null; |
---|
182 | } |
---|
183 | |
---|
184 | /** |
---|
185 | * To see if a preference has been set. |
---|
186 | * |
---|
187 | * @param string $key The name of the preference to check. |
---|
188 | * |
---|
189 | * @return boolean True if the preference isset and not empty |
---|
190 | * false otherwise. |
---|
191 | */ |
---|
192 | function exists($key) |
---|
193 | { |
---|
194 | return isset($_SESSION[$this->_ns]['data'][$key]); |
---|
195 | } |
---|
196 | |
---|
197 | /** |
---|
198 | * Clear a set preference value. |
---|
199 | * |
---|
200 | * @param string $key The name of the preference to delete. |
---|
201 | */ |
---|
202 | function delete($key) |
---|
203 | { |
---|
204 | unset($_SESSION[$this->_ns]['data'][$key]); |
---|
205 | } |
---|
206 | |
---|
207 | /** |
---|
208 | * Empty the $_SESSION cache. This should be executed with the same consideration as $auth->clear() |
---|
209 | */ |
---|
210 | function clear() |
---|
211 | { |
---|
212 | $_SESSION[$this->_ns] = array( |
---|
213 | 'loaded' => false, |
---|
214 | 'load_datetime' => '1970-01-01', |
---|
215 | 'data' => array() |
---|
216 | ); |
---|
217 | } |
---|
218 | |
---|
219 | /* |
---|
220 | * Retreives all prefs from the database and stores them in the $_SESSION. |
---|
221 | * |
---|
222 | * @access public |
---|
223 | * @param bool $force Set to always load from database, regardless if _isLoaded() or not. |
---|
224 | * @return bool True if loading succeeded. |
---|
225 | * @author Quinn Comendant <quinn@strangecode.com> |
---|
226 | * @version 1.0 |
---|
227 | * @since 04 Jun 2006 16:56:53 |
---|
228 | */ |
---|
229 | function load($force=false) |
---|
230 | { |
---|
231 | $app =& App::getInstance(); |
---|
232 | $db =& DB::getInstance(); |
---|
233 | |
---|
234 | // Skip this method if not using the db. |
---|
235 | if (true !== $this->getParam('enable_db')) { |
---|
236 | return true; |
---|
237 | } |
---|
238 | |
---|
239 | $this->initDB(); |
---|
240 | |
---|
241 | // Prefs already loaded for this session. |
---|
242 | if (!$force && $this->_isLoaded()) { |
---|
243 | return true; |
---|
244 | } |
---|
245 | |
---|
246 | // User_id must not be empty. |
---|
247 | if ('' == $this->getParam('user_id')) { |
---|
248 | $app->logMsg(sprintf('Cannot save prefs because user_id not set.', null), LOG_ERR, __FILE__, __LINE__); |
---|
249 | return false; |
---|
250 | } |
---|
251 | |
---|
252 | // Clear existing cache. |
---|
253 | $this->clear(); |
---|
254 | |
---|
255 | // Retreive all prefs for this user and namespace. |
---|
256 | $qid = $db->query(" |
---|
257 | SELECT pref_key, pref_value |
---|
258 | FROM " . $db->escapeString($this->getParam('db_table')) . " |
---|
259 | WHERE user_id = '" . $db->escapeString($this->getParam('user_id')) . "' |
---|
260 | AND pref_namespace = '" . $db->escapeString($this->_ns) . "' |
---|
261 | LIMIT 10000 |
---|
262 | "); |
---|
263 | while (list($key, $val) = mysql_fetch_row($qid)) { |
---|
264 | $_SESSION[$this->_ns]['data'][$key] = $val; |
---|
265 | } |
---|
266 | |
---|
267 | $app->logMsg(sprintf('%s prefs loaded from database.', sizeof($_SESSION[$this->_ns]['data'])), LOG_DEBUG, __FILE__, __LINE__); |
---|
268 | |
---|
269 | // Data loaded only once per session. |
---|
270 | $_SESSION[$this->_ns]['loaded'] = true; |
---|
271 | $_SESSION[$this->_ns]['load_datetime'] = date('Y-m-d H:i:s'); |
---|
272 | |
---|
273 | return true; |
---|
274 | } |
---|
275 | |
---|
276 | /* |
---|
277 | * Returns true if the prefs had been loaded from the database into the $_SESSION recently. |
---|
278 | * This function is simply a check so the database isn't access every page load. |
---|
279 | * |
---|
280 | * @access private |
---|
281 | * @return bool True if prefs are loaded. |
---|
282 | * @author Quinn Comendant <quinn@strangecode.com> |
---|
283 | * @version 1.0 |
---|
284 | * @since 04 Jun 2006 17:12:44 |
---|
285 | */ |
---|
286 | function _isLoaded() |
---|
287 | { |
---|
288 | if (isset($_SESSION[$this->_ns]['load_datetime']) |
---|
289 | && strtotime($_SESSION[$this->_ns]['load_datetime']) > time() - $this->getParam('load_timeout') |
---|
290 | && isset($_SESSION[$this->_ns]['loaded']) |
---|
291 | && true === $_SESSION[$this->_ns]['loaded']) { |
---|
292 | return true; |
---|
293 | } else { |
---|
294 | return false; |
---|
295 | } |
---|
296 | } |
---|
297 | |
---|
298 | /* |
---|
299 | * Saves all prefs stored in the $_SESSION into the database. |
---|
300 | * |
---|
301 | * @access public |
---|
302 | * @return bool True if prefs exist and were saved. |
---|
303 | * @author Quinn Comendant <quinn@strangecode.com> |
---|
304 | * @version 1.0 |
---|
305 | * @since 04 Jun 2006 17:19:56 |
---|
306 | */ |
---|
307 | function save() |
---|
308 | { |
---|
309 | $app =& App::getInstance(); |
---|
310 | $db =& DB::getInstance(); |
---|
311 | |
---|
312 | // Skip this method if not using the db. |
---|
313 | if (true !== $this->getParam('enable_db')) { |
---|
314 | return true; |
---|
315 | } |
---|
316 | |
---|
317 | // User_id must not be empty. |
---|
318 | if ('' == $this->getParam('user_id')) { |
---|
319 | $app->logMsg(sprintf('Cannot save prefs because user_id not set.', null), LOG_ERR, __FILE__, __LINE__); |
---|
320 | return false; |
---|
321 | } |
---|
322 | |
---|
323 | $this->initDB(); |
---|
324 | |
---|
325 | if (isset($_SESSION[$this->_ns]['data']) && is_array($_SESSION[$this->_ns]['data'])) { |
---|
326 | // Delete old prefs from database. |
---|
327 | $db->query(" |
---|
328 | DELETE FROM " . $db->escapeString($this->getParam('db_table')) . " |
---|
329 | WHERE user_id = '" . $db->escapeString($this->getParam('user_id')) . "' |
---|
330 | AND pref_namespace = '" . $db->escapeString($this->_ns) . "' |
---|
331 | "); |
---|
332 | |
---|
333 | // Insert new prefs. |
---|
334 | $insert_values = array(); |
---|
335 | foreach ($_SESSION[$this->_ns]['data'] as $key => $val) { |
---|
336 | if ('' != trim($key) && '' != trim($val)) { |
---|
337 | $insert_values[] = sprintf("('%s', '%s', '%s', '%s')", $db->escapeString($this->getParam('user_id')), $db->escapeString($this->_ns), $db->escapeString($key), $db->escapeString($val)); |
---|
338 | } |
---|
339 | } |
---|
340 | $db->query(" |
---|
341 | INSERT LOW_PRIORITY INTO " . $db->escapeString($this->getParam('db_table')) . " |
---|
342 | (user_id, pref_namespace, pref_key, pref_value) |
---|
343 | VALUES " . join(', ', $insert_values) . " |
---|
344 | "); |
---|
345 | |
---|
346 | $app->logMsg(sprintf('Saved %s preferences to database.', sizeof($insert_values)), LOG_DEBUG, __FILE__, __LINE__); |
---|
347 | return true; |
---|
348 | } |
---|
349 | |
---|
350 | return false; |
---|
351 | } |
---|
352 | } |
---|
353 | |
---|
354 | |
---|
355 | ?> |
---|