1 | <?php |
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2 | /** |
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3 | * Prefs.inc.php |
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4 | * code by strangecode :: www.strangecode.com :: this document contains copyrighted information |
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5 | * |
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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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8 | * |
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9 | * @author Quinn Comendant <quinn@strangecode.com> |
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10 | * @version 2.1 |
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11 | */ |
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12 | class Prefs { |
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13 | |
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14 | // Namespace of this instance of Prefs. |
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15 | var $_ns; |
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16 | |
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17 | // Configuration of this object. |
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18 | var $_params = array( |
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19 | |
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20 | // Enable database storage. |
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21 | 'enable_db' => true, |
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22 | |
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23 | // Name of database table to store prefs. |
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24 | 'db_table' => 'prefs_tbl', |
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25 | |
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26 | // Automatically create table and verify columns. Better set to false after site launch. |
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27 | 'create_table' => true, |
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28 | |
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29 | // The current user_id for which to load/save preferences. |
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30 | 'user_id' => null, |
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31 | ); |
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32 | |
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33 | /** |
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34 | * Prefs constructor. |
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35 | */ |
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36 | function Prefs($namespace='') |
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37 | { |
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38 | $app =& App::getInstance(); |
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39 | |
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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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44 | $_SESSION[$this->_ns] = array('loaded' => false, 'data' => array()); |
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45 | } |
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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' => $app->getParam('db_create_tables'))); |
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50 | } |
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51 | } |
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52 | |
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53 | /** |
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54 | * Setup the database table for this class. |
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55 | * |
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56 | * @access public |
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57 | * @author Quinn Comendant <quinn@strangecode.com> |
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58 | * @since 04 Jun 2006 16:41:42 |
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59 | */ |
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60 | function initDB($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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126 | * Sets the default value of a preference. The pref will be set only if |
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127 | * is not set already. |
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128 | * |
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129 | * @param string $key The name of the preference to modify. |
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130 | * @param string $val The new value for this preference. |
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131 | */ |
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132 | function setDefaults($defaults) |
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133 | { |
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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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137 | } |
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138 | } |
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139 | |
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140 | /** |
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141 | * Sets the given preferences to the specific value, |
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142 | * |
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143 | * @param string $key The name of the preference to modify. |
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144 | * @param string $val The new value for this preference. |
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145 | */ |
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146 | function set($key, $val) |
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147 | { |
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148 | $_SESSION[$this->_ns]['data'][$key] = $val; |
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149 | } |
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150 | |
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151 | /** |
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152 | * Returns the value of the requested preference. |
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153 | * |
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154 | * @param string $key The name of the preference to retrieve. |
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155 | * |
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156 | * @return string The value of the preference. |
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157 | */ |
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158 | function get($key) |
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159 | { |
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160 | return (isset($_SESSION[$this->_ns]['data'][$key])) ? $_SESSION[$this->_ns]['data'][$key] : null; |
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161 | } |
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162 | |
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163 | /** |
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164 | * To see if a preference has been set. |
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165 | * |
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166 | * @param string $key The name of the preference to check. |
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167 | * |
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168 | * @return boolean True if the preference isset and not empty |
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169 | * false otherwise. |
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170 | */ |
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171 | function exists($key) |
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172 | { |
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173 | return isset($_SESSION[$this->_ns]['data'][$key]); |
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174 | } |
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175 | |
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176 | /** |
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177 | * Clear a set preference value. |
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178 | * |
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179 | * @param string $key The name of the preference to delete. |
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180 | */ |
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181 | function delete($key) |
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182 | { |
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183 | unset($_SESSION[$this->_ns]['data'][$key]); |
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184 | } |
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185 | |
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186 | /** |
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187 | * Empty the $_SESSION cache. |
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188 | */ |
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189 | function clear() |
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190 | { |
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191 | $_SESSION[$this->_ns] = array(); |
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192 | } |
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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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209 | if (true !=== $this->getParam('enable_db')) { |
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210 | return true; |
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211 | } |
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212 | |
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213 | // Prefs already loaded for this session. |
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214 | if ($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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273 | if (true !=== $this->getParam('enable_db')) { |
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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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310 | } |
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311 | |
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312 | |
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313 | ?> |
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