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