[1] | 1 | <?php |
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| 2 | /** |
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[362] | 3 | * The Strangecode Codebase - a general application development framework for PHP |
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| 4 | * For details visit the project site: <http://trac.strangecode.com/codebase/> |
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[396] | 5 | * Copyright 2001-2012 Strangecode, LLC |
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[468] | 6 | * |
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[362] | 7 | * This file is part of The Strangecode Codebase. |
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| 8 | * |
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| 9 | * The Strangecode Codebase is free software: you can redistribute it and/or |
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| 10 | * modify it under the terms of the GNU General Public License as published by the |
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| 11 | * Free Software Foundation, either version 3 of the License, or (at your option) |
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| 12 | * any later version. |
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[468] | 13 | * |
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[362] | 14 | * The Strangecode Codebase is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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| 16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
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| 17 | * details. |
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[468] | 18 | * |
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[362] | 19 | * You should have received a copy of the GNU General Public License along with |
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| 20 | * The Strangecode Codebase. If not, see <http://www.gnu.org/licenses/>. |
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| 21 | */ |
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| 22 | |
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| 23 | /** |
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[138] | 24 | * Lock.inc.php |
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[1] | 25 | * |
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[138] | 26 | * The Lock class provides a system for locking abstract DB rows. |
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[136] | 27 | * |
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[1] | 28 | * @author Quinn Comendant <quinn@strangecode.com> |
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[136] | 29 | * @version 2.1 |
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[1] | 30 | */ |
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[502] | 31 | class Lock |
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| 32 | { |
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[468] | 33 | // A place to keep an object instance for the singleton pattern. |
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[484] | 34 | protected static $instance = null; |
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[468] | 35 | |
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[1] | 36 | // Configuration of this object. |
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[484] | 37 | protected $_params = array( |
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[560] | 38 | // The time required to pass before a user can forcibly unlock a locked record. |
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[1] | 39 | 'timeout' => 600, |
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[560] | 40 | |
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| 41 | // The time after which a record will automatically become unlocked. |
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[1] | 42 | 'auto_timeout' => 1800, |
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[560] | 43 | |
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| 44 | // The URL to the lock script. |
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[1] | 45 | 'error_url' => '/lock.php', |
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[560] | 46 | |
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| 47 | // The name of the database table to store locks. |
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[1] | 48 | 'db_table' => 'lock_tbl', |
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[146] | 49 | |
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| 50 | // Automatically create table and verify columns. Better set to false after site launch. |
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[396] | 51 | // This value is overwritten by the $app->getParam('db_create_tables') setting if it is available. |
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[146] | 52 | 'create_table' => true, |
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[1] | 53 | ); |
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| 54 | |
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| 55 | // Store lock data from DB. |
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[484] | 56 | protected $data = array(); |
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[1] | 57 | |
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| 58 | // Auth_SQL object from which to access a current user_id. |
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[523] | 59 | protected $_auth = null; |
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[1] | 60 | |
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| 61 | /** |
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| 62 | * This method enforces the singleton pattern for this class. |
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| 63 | * |
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[138] | 64 | * @return object Reference to the global Lock object. |
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[1] | 65 | * @access public |
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| 66 | * @static |
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| 67 | */ |
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[523] | 68 | public static function &getInstance($auth_object=null) |
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[1] | 69 | { |
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[468] | 70 | if (self::$instance === null) { |
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| 71 | self::$instance = new self($auth_object); |
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[1] | 72 | } |
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| 73 | |
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[468] | 74 | return self::$instance; |
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[1] | 75 | } |
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| 76 | |
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| 77 | /** |
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| 78 | * Constructor. Pass an Auth object on which to perform user lookups. |
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| 79 | * |
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[136] | 80 | * @param mixed $auth_object An Auth_SQL or Auth_FILE object. |
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[1] | 81 | */ |
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[523] | 82 | public function __construct($auth_object=null) |
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[1] | 83 | { |
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[479] | 84 | $app =& App::getInstance(); |
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[136] | 85 | |
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[523] | 86 | if (!is_null($auth_object) || is_null($this->_auth)) { |
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| 87 | if (!method_exists($auth_object, 'get') || !method_exists($auth_object, 'getUsername')) { |
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| 88 | trigger_error('Constructor not provided a valid Auth_* object.', E_USER_ERROR); |
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| 89 | } |
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| 90 | |
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| 91 | $this->_auth = $auth_object; |
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[22] | 92 | } |
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| 93 | |
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[1] | 94 | // Get create tables config from global context. |
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[136] | 95 | if (!is_null($app->getParam('db_create_tables'))) { |
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| 96 | $this->setParam(array('create_table' => $app->getParam('db_create_tables'))); |
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[1] | 97 | } |
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| 98 | } |
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| 99 | |
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| 100 | /** |
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| 101 | * Setup the database table for this class. |
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| 102 | * |
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| 103 | * @access public |
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| 104 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 105 | * @since 26 Aug 2005 17:09:36 |
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| 106 | */ |
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[468] | 107 | public function initDB($recreate_db=false) |
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[1] | 108 | { |
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[479] | 109 | $app =& App::getInstance(); |
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| 110 | $db =& DB::getInstance(); |
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[136] | 111 | |
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[1] | 112 | static $_db_tested = false; |
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[42] | 113 | |
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[1] | 114 | if ($recreate_db || !$_db_tested && $this->getParam('create_table')) { |
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| 115 | if ($recreate_db) { |
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[136] | 116 | $db->query("DROP TABLE IF EXISTS " . $this->getParam('db_table')); |
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[201] | 117 | $app->logMsg(sprintf('Dropping and recreating table %s.', $this->getParam('db_table')), LOG_INFO, __FILE__, __LINE__); |
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[1] | 118 | } |
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[146] | 119 | $db->query("CREATE TABLE IF NOT EXISTS " . $db->escapeString($this->getParam('db_table')) . " ( |
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[484] | 120 | lock_id INT UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT, |
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[1] | 121 | record_table varchar(255) NOT NULL default '', |
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| 122 | record_key varchar(255) NOT NULL default '', |
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| 123 | record_val varchar(255) NOT NULL default '', |
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| 124 | title varchar(255) NOT NULL default '', |
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| 125 | set_by_admin_id smallint(11) NOT NULL default '0', |
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| 126 | lock_datetime datetime NOT NULL default '0000-00-00 00:00:00', |
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| 127 | KEY record_table (record_table), |
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| 128 | KEY record_key (record_key), |
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| 129 | KEY record_val (record_val) |
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| 130 | )"); |
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[42] | 131 | |
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[136] | 132 | if (!$db->columnExists($this->getParam('db_table'), array( |
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[42] | 133 | 'lock_id', |
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| 134 | 'record_table', |
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| 135 | 'record_key', |
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| 136 | 'record_val', |
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| 137 | 'title', |
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| 138 | 'set_by_admin_id', |
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| 139 | 'lock_datetime', |
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[1] | 140 | ), false, false)) { |
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[136] | 141 | $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] | 142 | 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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| 143 | } |
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[42] | 144 | } |
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[1] | 145 | $_db_tested = true; |
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| 146 | } |
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| 147 | |
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| 148 | /** |
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| 149 | * Set the params of this object. |
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| 150 | * |
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| 151 | * @param array $params Array of param keys and values to set. |
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| 152 | */ |
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[468] | 153 | public function setParam($params=null) |
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[1] | 154 | { |
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| 155 | if (isset($params) && is_array($params)) { |
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| 156 | // Merge new parameters with old overriding only those passed. |
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| 157 | $this->_params = array_merge($this->_params, $params); |
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| 158 | } |
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| 159 | } |
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| 160 | |
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| 161 | /** |
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[136] | 162 | * Return the value of a parameter, if it exists. |
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[1] | 163 | * |
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[136] | 164 | * @access public |
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| 165 | * @param string $param Which parameter to return. |
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| 166 | * @return mixed Configured parameter value. |
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[1] | 167 | */ |
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[468] | 168 | public function getParam($param) |
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[1] | 169 | { |
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[479] | 170 | $app =& App::getInstance(); |
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[468] | 171 | |
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[478] | 172 | if (array_key_exists($param, $this->_params)) { |
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[1] | 173 | return $this->_params[$param]; |
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| 174 | } else { |
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[146] | 175 | $app->logMsg(sprintf('Parameter is not set: %s', $param), LOG_DEBUG, __FILE__, __LINE__); |
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[1] | 176 | return null; |
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| 177 | } |
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| 178 | } |
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| 179 | |
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| 180 | /** |
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| 181 | * Select the lock to manipulate. |
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| 182 | * |
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| 183 | * @param mixed $record_table_or_lock_id The table containing the record to lock, |
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| 184 | * or a numeric lock_id. |
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| 185 | * @param string $record_key The key column for the record to lock. |
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| 186 | * @param string $record_val The value of the key column for the record to lock. |
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| 187 | * @param string $title A title to apply to the lock, for display purposes. |
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| 188 | */ |
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[468] | 189 | public function select($record_table_or_lock_id, $record_key=null, $record_val=null) |
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[1] | 190 | { |
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[479] | 191 | $app =& App::getInstance(); |
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| 192 | $db =& DB::getInstance(); |
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[136] | 193 | |
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[1] | 194 | $this->initDB(); |
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| 195 | |
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| 196 | // Expire old locks. |
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| 197 | $this->_auto_timeout(); |
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[42] | 198 | |
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[1] | 199 | if (is_numeric($record_table_or_lock_id) && !isset($record_key) && !isset($record_val)) { |
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| 200 | // Get lock data by lock_id. |
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[136] | 201 | $qid = $db->query(" |
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[146] | 202 | SELECT * FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 203 | WHERE lock_id = '" . $db->escapeString($record_table_or_lock_id) . "' |
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[1] | 204 | "); |
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| 205 | } else { |
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| 206 | // Get lock data by record specs |
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[136] | 207 | $qid = $db->query(" |
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[146] | 208 | SELECT * FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 209 | WHERE record_table = '" . $db->escapeString($record_table_or_lock_id) . "' |
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| 210 | AND record_key = '" . $db->escapeString($record_key) . "' |
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| 211 | AND record_val = '" . $db->escapeString($record_val) . "' |
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[1] | 212 | "); |
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| 213 | } |
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| 214 | if ($this->data = mysql_fetch_assoc($qid)) { |
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[149] | 215 | $app->logMsg(sprintf('Selecting %slocked record: %s %s %s', ($this->data['set_by_admin_id'] == $this->_auth->get('user_id') ? 'self-' : ''), $record_table_or_lock_id, $record_key, $record_val), LOG_DEBUG, __FILE__, __LINE__); |
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[468] | 216 | // FIXME: What if admin set lock, but public user is current lock user? |
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[1] | 217 | $this->data['editor'] = $this->_auth->getUsername($this->data['set_by_admin_id']); |
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| 218 | return true; |
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| 219 | } else { |
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[136] | 220 | $app->logMsg(sprintf('No locked record: %s %s %s', $record_table_or_lock_id, $record_key, $record_val), LOG_DEBUG, __FILE__, __LINE__); |
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[1] | 221 | return false; |
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| 222 | } |
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| 223 | } |
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| 224 | |
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| 225 | /** |
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| 226 | * Returns true if the record we instantiated with is locked. |
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| 227 | * |
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| 228 | * @return bool True if locked. |
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| 229 | */ |
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[468] | 230 | public function isLocked() |
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[1] | 231 | { |
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| 232 | return isset($this->data['lock_id']); |
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| 233 | } |
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| 234 | |
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| 235 | /** |
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[42] | 236 | * Returns the status of who set the lock. Use this to ignore locks set by |
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[1] | 237 | * the current user. |
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| 238 | * |
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| 239 | * @return bool True if current user set the lock. |
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| 240 | */ |
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[468] | 241 | public function isMine() |
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[1] | 242 | { |
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[479] | 243 | $db =& DB::getInstance(); |
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[468] | 244 | |
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[1] | 245 | $this->initDB(); |
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[42] | 246 | |
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[1] | 247 | if (isset($this->data['lock_id'])) { |
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[146] | 248 | $qid = $db->query("SELECT * FROM " . $db->escapeString($this->getParam('db_table')) . " WHERE lock_id = '" . $db->escapeString($this->data['lock_id']) . "'"); |
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[1] | 249 | if ($lock = mysql_fetch_assoc($qid)) { |
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[149] | 250 | return ($lock['set_by_admin_id'] == $this->_auth->get('user_id')); |
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[1] | 251 | } else { |
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| 252 | return false; |
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| 253 | } |
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| 254 | } else { |
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| 255 | return false; |
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| 256 | } |
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| 257 | } |
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| 258 | |
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| 259 | /** |
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| 260 | * Create a new lock for the specified table/key/value. |
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| 261 | * |
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| 262 | * @param string $record_table The table containing the record to lock. |
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| 263 | * @param string $record_key The key column for the record to lock. |
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| 264 | * @param string $record_val The value of the key column for the record to lock. |
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| 265 | * @param string $title A title to apply to the lock, for display purposes. |
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| 266 | * |
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| 267 | * @return int The id for the lock (mysql last insert id). |
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| 268 | */ |
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[468] | 269 | public function set($record_table, $record_key, $record_val, $title='') |
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[42] | 270 | { |
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[479] | 271 | $db =& DB::getInstance(); |
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[468] | 272 | |
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[1] | 273 | $this->initDB(); |
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| 274 | |
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| 275 | // Expire old locks. |
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| 276 | $this->_auto_timeout(); |
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[42] | 277 | |
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[1] | 278 | // Remove previous locks if exist. Is this better than using a REPLACE INTO? |
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[136] | 279 | $db->query(" |
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[146] | 280 | DELETE FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 281 | WHERE record_table = '" . $db->escapeString($record_table) . "' |
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| 282 | AND record_key = '" . $db->escapeString($record_key) . "' |
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| 283 | AND record_val = '" . $db->escapeString($record_val) . "' |
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[1] | 284 | "); |
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[42] | 285 | |
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[1] | 286 | // Set new lock. |
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[136] | 287 | $db->query(" |
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[146] | 288 | INSERT INTO " . $db->escapeString($this->getParam('db_table')) . " ( |
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[1] | 289 | record_table, |
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| 290 | record_key, |
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| 291 | record_val, |
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| 292 | title, |
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| 293 | set_by_admin_id, |
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| 294 | lock_datetime |
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| 295 | ) VALUES ( |
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[136] | 296 | '" . $db->escapeString($record_table) . "', |
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| 297 | '" . $db->escapeString($record_key) . "', |
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| 298 | '" . $db->escapeString($record_val) . "', |
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| 299 | '" . $db->escapeString($title) . "', |
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[149] | 300 | '" . $db->escapeString($this->_auth->get('user_id')) . "', |
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[1] | 301 | NOW() |
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| 302 | ) |
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| 303 | "); |
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[136] | 304 | $lock_id = mysql_insert_id($db->getDBH()); |
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[42] | 305 | |
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[1] | 306 | // Must register this locked record as the current. |
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| 307 | $this->select($lock_id); |
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[42] | 308 | |
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[1] | 309 | return $lock_id; |
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| 310 | } |
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| 311 | |
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| 312 | /** |
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| 313 | * Unlock the currently selected record. |
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| 314 | */ |
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[468] | 315 | public function remove() |
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[1] | 316 | { |
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[479] | 317 | $app =& App::getInstance(); |
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| 318 | $db =& DB::getInstance(); |
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[136] | 319 | |
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[1] | 320 | $this->initDB(); |
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| 321 | |
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| 322 | // Expire old locks. |
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| 323 | $this->_auto_timeout(); |
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[42] | 324 | |
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[1] | 325 | // Delete a specific lock. |
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[136] | 326 | $db->query(" |
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[146] | 327 | DELETE FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[136] | 328 | WHERE lock_id = '" . $db->escapeString($this->data['lock_id']) . "' |
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[1] | 329 | "); |
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[42] | 330 | |
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[136] | 331 | $app->logMsg(sprintf('Removing lock: %s', $this->data['lock_id']), LOG_DEBUG, __FILE__, __LINE__); |
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[1] | 332 | } |
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| 333 | |
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| 334 | /** |
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| 335 | * Unlock all records, or all records for a specified user. |
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| 336 | */ |
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[468] | 337 | public function removeAll($user_id=null) |
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[42] | 338 | { |
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[479] | 339 | $app =& App::getInstance(); |
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| 340 | $db =& DB::getInstance(); |
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[136] | 341 | |
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[1] | 342 | $this->initDB(); |
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| 343 | |
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| 344 | // Expire old locks. |
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| 345 | $this->_auto_timeout(); |
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[42] | 346 | |
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[1] | 347 | if (isset($user_id)) { |
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| 348 | // Delete specific user's locks. |
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[146] | 349 | $db->query("DELETE FROM " . $db->escapeString($this->getParam('db_table')) . " WHERE set_by_admin_id = '" . $db->escapeString($user_id) . "'"); |
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[202] | 350 | $app->logMsg(sprintf('Record locks owned by user %s have been deleted', $this->_auth->getUsername($user_id)), LOG_DEBUG, __FILE__, __LINE__); |
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[1] | 351 | } else { |
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| 352 | // Delete ALL locks. |
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[146] | 353 | $db->query("DELETE FROM " . $db->escapeString($this->getParam('db_table')) . ""); |
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[202] | 354 | $app->logMsg(sprintf('All record locks deleted by user %s', $this->_auth->get('username')), LOG_DEBUG, __FILE__, __LINE__); |
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[1] | 355 | } |
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| 356 | } |
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| 357 | |
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| 358 | /** |
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[334] | 359 | * Deletes all locks that are older than auto_timeout. |
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[1] | 360 | */ |
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[468] | 361 | public function _auto_timeout() |
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[1] | 362 | { |
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[479] | 363 | $db =& DB::getInstance(); |
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[468] | 364 | |
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[1] | 365 | static $_timeout_run = false; |
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| 366 | |
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| 367 | $this->initDB(); |
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[42] | 368 | |
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[1] | 369 | if (!$_timeout_run) { |
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| 370 | // Delete all old locks. |
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[136] | 371 | $db->query(" |
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[146] | 372 | DELETE FROM " . $db->escapeString($this->getParam('db_table')) . " |
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[1] | 373 | WHERE DATE_ADD(lock_datetime, INTERVAL '" . $this->getParam('auto_timeout') . "' SECOND) < NOW() |
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| 374 | "); |
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| 375 | $_timeout_run = true; |
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| 376 | } |
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| 377 | } |
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| 378 | |
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| 379 | /** |
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| 380 | * Redirect to record lock error page. |
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| 381 | */ |
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[468] | 382 | public function dieErrorPage() |
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[1] | 383 | { |
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[479] | 384 | $app =& App::getInstance(); |
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[136] | 385 | |
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[526] | 386 | $app->dieURL($this->getParam('error_url'), array('lock_id' => $this->data['lock_id'], 'boomerang' => urlencode(absoluteMe()))); |
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[1] | 387 | } |
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| 388 | |
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| 389 | /** |
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| 390 | * Print error page. |
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| 391 | */ |
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[468] | 392 | public function printErrorHTML() |
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[1] | 393 | { |
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[479] | 394 | $app =& App::getInstance(); |
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[1] | 395 | ?> |
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[185] | 396 | <form method="post" action="<?php echo oTxt($_SERVER['PHP_SELF']); ?>"> |
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[424] | 397 | <?php $app->printHiddenSession() ?> |
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| 398 | <input type="hidden" name="lock_id" value="<?php echo $this->getID(); ?>" /> |
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| 399 | <div id="sc-msg" class="sc-msg"> |
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| 400 | <div class="sc-msg-notice"> |
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| 401 | <?php printf(_("The record %s is currently being edited by %s (%d minutes elapsed). You cannot modify the record while it is locked by another user."), |
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| 402 | $this->getTitle(), |
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| 403 | $this->getEditor(), |
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| 404 | date('i', $this->getSecondsElapsed() + 60) |
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| 405 | ); ?> |
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| 406 | </div> |
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| 407 | <?php if ($this->getSecondsElapsed() >= $this->getParam('timeout')) { ?> |
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| 408 | <div class="sc-msg-notice"><?php printf(_("You can forcibly unlock the record if you believe the editing session has expired. You might want to confirm with %s before doing this."), $this->getEditor()) ?></div> |
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| 409 | <div class="sc-msg-notice"> |
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| 410 | <input type="submit" name="unlock" value="<?php echo _("Unlock"); ?>" /> |
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| 411 | <input type="submit" name="cancel" value="<?php echo _("Cancel"); ?>" /> |
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| 412 | </div> |
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| 413 | <?php } else { ?> |
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| 414 | <div class="sc-msg-notice"> |
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| 415 | <input type="submit" name="cancel" value="<?php echo _("Cancel"); ?>" /> |
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| 416 | </div> |
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| 417 | <?php } ?> |
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| 418 | </div> |
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[1] | 419 | </form> |
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| 420 | <?php |
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| 421 | } |
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| 422 | |
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| 423 | /** |
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| 424 | * Return lock_id of locked record. |
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| 425 | */ |
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[468] | 426 | public function getID() |
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[1] | 427 | { |
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| 428 | return $this->data['lock_id']; |
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| 429 | } |
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| 430 | |
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| 431 | /** |
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| 432 | * Return title of locked record. |
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| 433 | */ |
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[468] | 434 | public function getTitle() |
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[1] | 435 | { |
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| 436 | return $this->data['title']; |
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| 437 | } |
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| 438 | |
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| 439 | /** |
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| 440 | * Return administrator username for locked record. |
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| 441 | */ |
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[468] | 442 | public function getEditor() |
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[1] | 443 | { |
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| 444 | return $this->data['editor']; |
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| 445 | } |
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| 446 | |
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| 447 | /** |
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| 448 | * Return total seconds since the record was locked. |
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| 449 | */ |
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[468] | 450 | public function getSecondsElapsed() |
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[1] | 451 | { |
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[235] | 452 | if (isset($this->data['lock_datetime']) && strtotime($this->data['lock_datetime']) < time()) { |
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[1] | 453 | return time() - strtotime($this->data['lock_datetime']); |
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| 454 | } else { |
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| 455 | return 0; |
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| 456 | } |
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| 457 | } |
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| 458 | |
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| 459 | |
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| 460 | } // End of class. |
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