[1] | 1 | <?php |
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| 2 | /** |
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[137] | 3 | * Version.inc.php |
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[136] | 4 | * code by strangecode :: www.strangecode.com :: this document contains copyrighted information |
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| 5 | * |
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[137] | 6 | * The Version class provides a system for saving, reviewing, and |
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[1] | 7 | * restoring versions of a record of any DB table. All the data in the record is |
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| 8 | * serialized, compressed, and saved in a blob in the version_tbl. Restoring a |
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| 9 | * version simply does a REPLACE INTO of the data. It is very simple, and works |
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| 10 | * with multiple database tables, but the drawback is that relationships for |
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[42] | 11 | * a record cannot be retained. For example, an article from an article_tbl can |
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[1] | 12 | * be saved, but not categories associated to the record in a category_article_tbl. |
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| 13 | * The restored article will simple retain the relationships that the previous |
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| 14 | * current article had. |
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| 15 | * |
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| 16 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 17 | * @version 2.1 |
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| 18 | */ |
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[137] | 19 | class Version { |
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[1] | 20 | |
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| 21 | // Configuration of this object. |
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| 22 | var $_params = array( |
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| 23 | 'max_qty' => 100, // Never have more than this many versions of each record. |
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| 24 | 'min_qty' => 25, // Keep at least this many versions of each record. |
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| 25 | 'min_days' => 7, // Keep ALL versions within this many days, even if MORE than min_qty. |
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| 26 | 'db_table' => 'version_tbl', |
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[146] | 27 | |
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| 28 | // Automatically create table and verify columns. Better set to false after site launch. |
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| 29 | 'create_table' => true, |
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[1] | 30 | 'db_schema_strict' => true, // If true, makes an exact comparison of saved vs. live table schemas. If false, just checks that the saved columns are available. |
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| 31 | ); |
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| 32 | |
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| 33 | // Auth_SQL object from which to access a current user_id. |
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| 34 | var $_auth; |
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| 35 | |
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| 36 | /** |
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| 37 | * This method enforces the singleton pattern for this class. |
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| 38 | * |
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[139] | 39 | * @return object Reference to the global Lock object. |
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[1] | 40 | * @access public |
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| 41 | * @static |
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| 42 | */ |
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| 43 | function &getInstance($auth_object) |
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| 44 | { |
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[136] | 45 | static $instance = null; |
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[42] | 46 | |
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[136] | 47 | if ($instance === null) { |
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[137] | 48 | $instance = new Version($auth_object); |
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[1] | 49 | } |
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| 50 | |
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[136] | 51 | return $instance; |
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[1] | 52 | } |
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| 53 | |
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| 54 | /** |
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| 55 | * Constructor. Pass an Auth object on which to perform user lookups. |
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| 56 | * |
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| 57 | * @param mixed $auth_object An Auth_SQL object. |
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| 58 | */ |
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[137] | 59 | function Version($auth_object) |
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[1] | 60 | { |
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[136] | 61 | $app =& App::getInstance(); |
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| 62 | |
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[149] | 63 | if (!method_exists($auth_object, 'get') || !method_exists($auth_object, 'getUsername')) { |
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[136] | 64 | trigger_error('Constructor not provided a valid Auth_* object.', E_USER_ERROR); |
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[19] | 65 | } |
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[42] | 66 | |
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[1] | 67 | $this->_auth = $auth_object; |
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[42] | 68 | |
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[1] | 69 | // Get create tables config from global context. |
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[136] | 70 | if (!is_null($app->getParam('db_create_tables'))) { |
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| 71 | $this->setParam(array('create_table' => $app->getParam('db_create_tables'))); |
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[1] | 72 | } |
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| 73 | } |
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[42] | 74 | |
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[1] | 75 | /** |
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| 76 | * Setup the database table for this class. |
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| 77 | * |
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| 78 | * @access public |
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| 79 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 80 | * @since 26 Aug 2005 17:09:36 |
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| 81 | */ |
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| 82 | function initDB($recreate_db=false) |
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| 83 | { |
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[136] | 84 | $app =& App::getInstance(); |
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| 85 | $db =& DB::getInstance(); |
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| 86 | |
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[1] | 87 | static $_db_tested = false; |
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[42] | 88 | |
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[1] | 89 | if ($recreate_db || !$_db_tested && $this->getParam('create_table')) { |
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| 90 | if ($recreate_db) { |
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[136] | 91 | $db->query("DROP TABLE IF EXISTS " . $this->getParam('db_table')); |
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[201] | 92 | $app->logMsg(sprintf('Dropping and recreating table %s.', $this->getParam('db_table')), LOG_INFO, __FILE__, __LINE__); |
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[1] | 93 | } |
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[146] | 94 | $db->query("CREATE TABLE IF NOT EXISTS " . $db->escapeString($this->getParam('db_table')) . " ( |
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[169] | 95 | version_id INT NOT NULL AUTO_INCREMENT, |
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| 96 | record_table VARCHAR(255) NOT NULL DEFAULT '', |
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| 97 | record_key VARCHAR(255) NOT NULL DEFAULT '', |
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| 98 | record_val VARCHAR(255) NOT NULL DEFAULT '', |
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| 99 | version_data MEDIUMBLOB NOT NULL, |
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| 100 | version_title VARCHAR(255) NOT NULL DEFAULT '', |
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| 101 | version_number SMALLINT(11) UNSIGNED NOT NULL DEFAULT '0', |
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| 102 | version_notes VARCHAR(255) NOT NULL DEFAULT '', |
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| 103 | saved_by_user_id SMALLINT(11) NOT NULL DEFAULT '0', |
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| 104 | version_datetime DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00', |
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[1] | 105 | PRIMARY KEY (version_id), |
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| 106 | KEY record_table (record_table), |
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| 107 | KEY record_key (record_key), |
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| 108 | KEY record_val (record_val) |
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| 109 | )"); |
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[42] | 110 | |
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[136] | 111 | if (!$db->columnExists($this->getParam('db_table'), array( |
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[1] | 112 | 'version_id', |
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| 113 | 'record_table', |
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| 114 | 'record_key', |
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| 115 | 'record_val', |
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| 116 | 'version_data', |
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| 117 | 'version_title', |
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[169] | 118 | 'version_number', |
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[1] | 119 | 'version_notes', |
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[144] | 120 | 'saved_by_user_id', |
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[1] | 121 | 'version_datetime', |
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| 122 | ), false, false)) { |
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[136] | 123 | $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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[1] | 124 | 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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| 125 | } |
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[42] | 126 | } |
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[1] | 127 | $_db_tested = true; |
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| 128 | } |
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| 129 | |
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| 130 | /** |
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| 131 | * Set the params of this object. |
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| 132 | * |
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| 133 | * @param array $params Array of param keys and values to set. |
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| 134 | */ |
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| 135 | function setParam($params=null) |
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| 136 | { |
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| 137 | if (isset($params) && is_array($params)) { |
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| 138 | // Merge new parameters with old overriding only those passed. |
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| 139 | $this->_params = array_merge($this->_params, $params); |
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| 140 | } |
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| 141 | } |
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| 142 | |
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| 143 | /** |
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[136] | 144 | * Return the value of a parameter, if it exists. |
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[1] | 145 | * |
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[136] | 146 | * @access public |
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| 147 | * @param string $param Which parameter to return. |
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| 148 | * @return mixed Configured parameter value. |
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[1] | 149 | */ |
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| 150 | function getParam($param) |
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| 151 | { |
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[136] | 152 | $app =& App::getInstance(); |
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| 153 | |
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[1] | 154 | if (isset($this->_params[$param])) { |
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| 155 | return $this->_params[$param]; |
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| 156 | } else { |
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[146] | 157 | $app->logMsg(sprintf('Parameter is not set: %s', $param), LOG_DEBUG, __FILE__, __LINE__); |
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[1] | 158 | return null; |
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| 159 | } |
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| 160 | } |
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| 161 | |
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| 162 | /** |
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| 163 | * Saves a version of the current record into the version table. |
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| 164 | * |
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| 165 | * @param string $record_table The table containing the record. |
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| 166 | * @param string $record_key The key column for the record. |
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| 167 | * @param string $record_val The value of the key column for the record. |
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| 168 | * @param string $title The title of this record. Only used for human presentation. |
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| 169 | * |
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| 170 | * @return int The id for the version (mysql last insert id). |
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| 171 | */ |
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| 172 | function create($record_table, $record_key, $record_val, $title='', $notes='') |
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| 173 | { |
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[136] | 174 | $app =& App::getInstance(); |
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| 175 | $db =& DB::getInstance(); |
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| 176 | |
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[1] | 177 | $this->initDB(); |
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[42] | 178 | |
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[1] | 179 | // Get current record. |
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| 180 | if (!$record = $this->getCurrent($record_table, $record_key, $record_val)) { |
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[136] | 181 | $app->logMsg(sprintf('Could not create %s version, record not found: %s, %s, %s.', $title, $record_table, $record_key, $record_val), LOG_ERR, __FILE__, __LINE__); |
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[1] | 182 | return false; |
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| 183 | } |
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[169] | 184 | |
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| 185 | // Get previous version_number. |
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| 186 | $qid = $db->query(" |
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| 187 | SELECT MAX(version_number) FROM " . $db->escapeString($this->getParam('db_table')) . " |
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| 188 | WHERE record_table = '" . $db->escapeString($record_table) . "' |
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| 189 | AND record_key = '" . $db->escapeString($record_key) . "' |
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| 190 | AND record_val = '" . $db->escapeString($record_val) . "' |
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| 191 | "); |
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| 192 | list($last_version_number) = mysql_fetch_row($qid); |
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[42] | 193 | |
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[1] | 194 | // Clean-up old versions. |
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| 195 | $this->deleteOld($record_table, $record_key, $record_val); |
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[42] | 196 | |
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[1] | 197 | // Save as new version. |
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[159] | 198 | // TODO: after MySQL 5.0.23 is released this query could benefit from INSERT DELAYED. |
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[136] | 199 | $db->query(" |
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[146] | 200 | INSERT INTO " . $db->escapeString($this->getParam('db_table')) . " ( |
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[1] | 201 | record_table, |
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| 202 | record_key, |
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| 203 | record_val, |
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| 204 | version_data, |
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| 205 | version_title, |
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[169] | 206 | version_number, |
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[1] | 207 | version_notes, |
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[144] | 208 | saved_by_user_id, |
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[1] | 209 | version_datetime |
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| 210 | ) VALUES ( |
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[136] | 211 | '" . $db->escapeString($record_table) . "', |
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| 212 | '" . $db->escapeString($record_key) . "', |
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| 213 | '" . $db->escapeString($record_val) . "', |
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| 214 | '" . $db->escapeString(gzcompress(serialize($record), 9)) . "', |
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| 215 | '" . $db->escapeString($title) . "', |
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[169] | 216 | '" . $db->escapeString($last_version_number + 1) . "', |
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[136] | 217 | '" . $db->escapeString($notes) . "', |
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[149] | 218 | '" . $db->escapeString($this->_auth->get('user_id')) . "', |
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[1] | 219 | NOW() |
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| 220 | ) |
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| 221 | "); |
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| 222 | |
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[136] | 223 | return mysql_insert_id($db->getDBH()); |
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[1] | 224 | } |
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| 225 | |
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| 226 | /** |
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| 227 | * Copy a version back into it's original table. |
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| 228 | * |
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| 229 | * @param string $version_id The id of the version to restore. |
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| 230 | * |
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| 231 | * @return int The id for the version (mysql last insert id). |
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| 232 | */ |
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| 233 | function restore($version_id) |
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| 234 | { |
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[136] | 235 | $app =& App::getInstance(); |
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| 236 | $db =& DB::getInstance(); |
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| 237 | |
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[1] | 238 | $this->initDB(); |
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[42] | 239 | |
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[1] | 240 | // Get version data. |
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[136] | 241 | $qid = $db->query(" |
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[146] | 242 | SELECT * FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 243 | WHERE version_id = '" . $db->escapeString($version_id) . "' |
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[1] | 244 | "); |
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| 245 | if (!$record = mysql_fetch_assoc($qid)) { |
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[136] | 246 | $app->raiseMsg(sprintf(_("Version ID %s%s not found."), $version_id, (empty($record['version_title']) ? '' : ' (' . $record['version_title'] . ')')), MSG_WARNING, __FILE__, __LINE__); |
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[141] | 247 | $app->logMsg(sprintf('Version ID %s%s not found.', $version_id, (empty($record['version_title']) ? '' : ' (' . $record['version_title'] . ')')), LOG_WARNING, __FILE__, __LINE__); |
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[1] | 248 | return false; |
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| 249 | } |
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| 250 | $data = unserialize(gzuncompress($record['version_data'])); |
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| 251 | |
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| 252 | // Ensure saved db columns match current table schema. |
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[136] | 253 | if (!$db->columnExists($record['record_table'], array_keys($data), $this->getParam('db_schema_strict'))) { |
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| 254 | $app->raiseMsg(sprintf(_("Version ID %s%s is not compatible with the current database table."), $version_id, (empty($record['version_title']) ? '' : ' (' . $record['version_title'] . ')')), MSG_ERR, __FILE__, __LINE__); |
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[141] | 255 | $app->logMsg(sprintf('Version ID %s%s restoration failed, DB schema does not match for table %s.', $version_id, (empty($record['version_title']) ? '' : ' (' . $record['version_title'] . ')'), $record['record_table']), LOG_ALERT, __FILE__, __LINE__); |
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[1] | 256 | return false; |
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| 257 | } |
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| 258 | |
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| 259 | // SQLize the keys of the specified versioned record. |
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[136] | 260 | $replace_keys = join(",\n", array_map(array($db, 'escapeString'), array_keys($data))); |
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[42] | 261 | |
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[1] | 262 | // SQLize the keys of the values of the specified versioned record. (These are more complex because we need to account for SQL null values.) |
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| 263 | $replace_values = ''; |
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| 264 | $comma = ''; |
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| 265 | foreach ($data as $v) { |
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[136] | 266 | $replace_values .= is_null($v) ? "$comma\nNULL" : "$comma\n'" . $db->escapeString($v) . "'"; |
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[1] | 267 | $comma = ','; |
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| 268 | } |
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[42] | 269 | |
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[1] | 270 | // Replace current record with specified versioned record. |
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[136] | 271 | $db->query(" |
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[1] | 272 | REPLACE INTO " . $record['record_table'] . " ( |
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| 273 | $replace_keys |
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| 274 | ) VALUES ( |
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| 275 | $replace_values |
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| 276 | ) |
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| 277 | "); |
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[42] | 278 | |
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[1] | 279 | return $record; |
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| 280 | } |
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| 281 | |
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| 282 | /** |
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| 283 | * Version garbage collection. Deletes versions older than min_days |
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| 284 | * when quantity of versions exceeds min_qty. If quantity |
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[42] | 285 | * exceeds 100 within min_days, the oldest are deleted to bring the |
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[1] | 286 | * quantity back down to min_qty. |
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| 287 | * |
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| 288 | * @param string $record_table The table containing the record. |
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| 289 | * @param string $record_key The key column for the record. |
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| 290 | * @param string $record_val The value of the key column for the record. |
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| 291 | * |
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| 292 | * @return mixed Array of versions, or false if none. |
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| 293 | */ |
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| 294 | function deleteOld($record_table, $record_key, $record_val) |
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| 295 | { |
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[136] | 296 | $db =& DB::getInstance(); |
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| 297 | |
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[1] | 298 | $this->initDB(); |
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[42] | 299 | |
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[1] | 300 | // Get total number of versions for this record. |
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[136] | 301 | $qid = $db->query(" |
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[146] | 302 | SELECT COUNT(*) FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 303 | WHERE record_table = '" . $db->escapeString($record_table) . "' |
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| 304 | AND record_key = '" . $db->escapeString($record_key) . "' |
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| 305 | AND record_val = '" . $db->escapeString($record_val) . "' |
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[1] | 306 | "); |
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| 307 | list($v_count) = mysql_fetch_row($qid); |
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[42] | 308 | |
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[1] | 309 | if ($v_count > $this->getParam('min_qty')) { |
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| 310 | if ($v_count > $this->getParam('max_qty')) { |
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| 311 | // To prevent a record bomb, limit max number of versions to max_qty. |
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| 312 | // First query for oldest records, selecting enough to bring total number down to min_qty. |
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[136] | 313 | $qid = $db->query(" |
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[146] | 314 | SELECT version_id FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 315 | WHERE record_table = '" . $db->escapeString($record_table) . "' |
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| 316 | AND record_key = '" . $db->escapeString($record_key) . "' |
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| 317 | AND record_val = '" . $db->escapeString($record_val) . "' |
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[1] | 318 | ORDER BY version_datetime ASC |
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| 319 | LIMIT " . ($v_count - $this->getParam('min_qty')) . " |
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| 320 | "); |
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| 321 | while (list($old_id) = mysql_fetch_row($qid)) { |
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| 322 | $old_versions[] = $old_id; |
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| 323 | } |
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[136] | 324 | $db->query(" |
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[146] | 325 | DELETE FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[1] | 326 | WHERE version_id IN ('" . join("','", $old_versions) . "') |
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| 327 | "); |
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| 328 | } else { |
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[49] | 329 | // Delete versions older than min_days, while still keeping min_qty. |
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[136] | 330 | $qid = $db->query(" |
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[146] | 331 | SELECT version_id FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 332 | WHERE record_table = '" . $db->escapeString($record_table) . "' |
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| 333 | AND record_key = '" . $db->escapeString($record_key) . "' |
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| 334 | AND record_val = '" . $db->escapeString($record_val) . "' |
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[1] | 335 | AND DATE_ADD(version_datetime, INTERVAL '" . $this->getParam('min_days') . "' DAY) < NOW() |
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| 336 | ORDER BY version_datetime ASC |
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| 337 | LIMIT " . ($v_count - $this->getParam('min_qty')) . " |
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| 338 | "); |
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| 339 | while (list($old_id) = mysql_fetch_row($qid)) { |
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| 340 | $old_versions[] = $old_id; |
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| 341 | } |
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| 342 | if (sizeof($old_versions) > 0) { |
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[136] | 343 | $db->query(" |
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[146] | 344 | DELETE FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[1] | 345 | WHERE version_id IN ('" . join("','", $old_versions) . "') |
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| 346 | "); |
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| 347 | } |
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| 348 | } |
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| 349 | } |
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| 350 | } |
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| 351 | |
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| 352 | /** |
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| 353 | * Get a list of versions of specified record. |
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| 354 | * |
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| 355 | * @param string $record_table The table containing the record. |
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| 356 | * @param string $record_key The key column for the record. |
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| 357 | * @param string $record_val The value of the key column for the record. |
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| 358 | * |
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| 359 | * @return mixed Array of versions, or false if none. |
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| 360 | */ |
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| 361 | function getList($record_table, $record_key, $record_val) |
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| 362 | { |
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[136] | 363 | $db =& DB::getInstance(); |
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| 364 | |
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[1] | 365 | $this->initDB(); |
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[42] | 366 | |
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[1] | 367 | // Get versions of this record. |
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[136] | 368 | $qid = $db->query(" |
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[169] | 369 | SELECT |
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| 370 | version_id, |
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| 371 | saved_by_user_id, |
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| 372 | version_datetime, |
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| 373 | version_title, |
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| 374 | version_number, |
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| 375 | version_notes |
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[146] | 376 | FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 377 | WHERE record_table = '" . $db->escapeString($record_table) . "' |
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| 378 | AND record_key = '" . $db->escapeString($record_key) . "' |
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| 379 | AND record_val = '" . $db->escapeString($record_val) . "' |
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[1] | 380 | ORDER BY version_datetime DESC |
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[15] | 381 | "); |
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[1] | 382 | $versions = array(); |
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| 383 | while ($row = mysql_fetch_assoc($qid)) { |
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| 384 | // Get admin usernames. |
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[161] | 385 | $row['editor'] = $this->_auth->getUsername($row['saved_by_user_id']); |
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[1] | 386 | $versions[] = $row; |
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| 387 | } |
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| 388 | return $versions; |
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| 389 | } |
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| 390 | |
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| 391 | /** |
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| 392 | * Get the version record for a specified version id. |
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| 393 | * |
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| 394 | * @param string $version_id The id of the version to restore. |
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| 395 | * |
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| 396 | * @return mixed Array of data saved in version, or false if none. |
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| 397 | */ |
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| 398 | function getVerson($version_id) |
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| 399 | { |
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[136] | 400 | $db =& DB::getInstance(); |
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| 401 | |
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[1] | 402 | $this->initDB(); |
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[42] | 403 | |
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[1] | 404 | // Get version data. |
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[136] | 405 | $qid = $db->query(" |
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[146] | 406 | SELECT * FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 407 | WHERE version_id = '" . $db->escapeString($version_id) . "' |
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[1] | 408 | "); |
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| 409 | return mysql_fetch_assoc($qid); |
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| 410 | } |
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| 411 | |
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| 412 | /** |
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| 413 | * Get the data stored for a specified version id. |
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| 414 | * |
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| 415 | * @param string $version_id The id of the version to restore. |
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| 416 | * |
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| 417 | * @return mixed Array of data saved in version, or false if none. |
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| 418 | */ |
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| 419 | function getData($version_id) |
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| 420 | { |
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[136] | 421 | $db =& DB::getInstance(); |
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| 422 | |
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[1] | 423 | $this->initDB(); |
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[42] | 424 | |
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[1] | 425 | // Get version data. |
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[136] | 426 | $qid = $db->query(" |
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[146] | 427 | SELECT * FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 428 | WHERE version_id = '" . $db->escapeString($version_id) . "' |
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[1] | 429 | "); |
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| 430 | $record = mysql_fetch_assoc($qid); |
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| 431 | if (isset($record['version_data'])) { |
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| 432 | return unserialize(gzuncompress($record['version_data'])); |
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| 433 | } else { |
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| 434 | return false; |
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| 435 | } |
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| 436 | } |
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| 437 | |
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| 438 | /** |
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| 439 | * Get the current record data from the original table. |
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| 440 | * |
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| 441 | * @param string $version_id The id of the version to restore. |
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| 442 | * |
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| 443 | * @return mixed Array of data saved in version, or false if none. |
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| 444 | */ |
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| 445 | function getCurrent($record_table, $record_key, $record_val) |
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| 446 | { |
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[136] | 447 | $db =& DB::getInstance(); |
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| 448 | |
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[1] | 449 | $this->initDB(); |
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[42] | 450 | |
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[136] | 451 | $qid = $db->query(" |
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| 452 | SELECT * FROM " . $db->escapeString($record_table) . " |
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| 453 | WHERE " . $db->escapeString($record_key) . " = '" . $db->escapeString($record_val) . "' |
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[1] | 454 | "); |
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| 455 | if ($record = mysql_fetch_assoc($qid)) { |
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| 456 | return $record; |
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| 457 | } else { |
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| 458 | return false; |
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| 459 | } |
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| 460 | } |
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| 461 | |
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| 462 | |
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| 463 | } // End of class. |
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| 464 | ?> |
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