includes/api/ApiQueryBase.php

   1 <?php
   2
   3 /*
   4  * Created on Sep 7, 2006
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 if (!defined('MEDIAWIKI')) {
  27         // Eclipse helper - will be ignored in production
  28         require_once ('ApiBase.php');
  29 }
  30
  31 /**
  32  * This is a base class for all Query modules.
  33  * It provides some common functionality such as constructing various SQL queries.
  34  *
  35  * @addtogroup API
  36  */
  37 abstract class ApiQueryBase extends ApiBase {
  38
  39         private $mQueryModule, $mDb, $tables, $where, $fields, $options;
  40
  41         public function __construct($query, $moduleName, $paramPrefix = '') {
  42                 parent :: __construct($query->getMain(), $moduleName, $paramPrefix);
  43                 $this->mQueryModule = $query;
  44                 $this->mDb = null;
  45                 $this->resetQueryParams();
  46         }
  47
  48         protected function resetQueryParams() {
  49                 $this->tables = array ();
  50                 $this->where = array ();
  51                 $this->fields = array ();
  52                 $this->options = array ();
  53         }
  54
  55         protected function addTables($tables, $alias = null) {
  56                 if (is_array($tables)) {
  57                         if (!is_null($alias))
  58                                 ApiBase :: dieDebug(__METHOD__, 'Multiple table aliases not supported');
  59                         $this->tables = array_merge($this->tables, $tables);
  60                 } else {
  61                         if (!is_null($alias))
  62                                 $tables = $this->getDB()->tableName($tables) . ' ' . $alias;
  63                         $this->tables[] = $tables;
  64                 }
  65         }
  66
  67         protected function addFields($value) {
  68                 if (is_array($value))
  69                         $this->fields = array_merge($this->fields, $value);
  70                 else
  71                         $this->fields[] = $value;
  72         }
  73
  74         protected function addFieldsIf($value, $condition) {
  75                 if ($condition) {
  76                         $this->addFields($value);
  77                         return true;
  78                 }
  79                 return false;
  80         }
  81
  82         protected function addWhere($value) {
  83                 if (is_array($value))
  84                         $this->where = array_merge($this->where, $value);
  85                 else
  86                         $this->where[] = $value;
  87         }
  88
  89         protected function addWhereIf($value, $condition) {
  90                 if ($condition) {
  91                         $this->addWhere($value);
  92                         return true;
  93                 }
  94                 return false;
  95         }
  96
  97         protected function addWhereFld($field, $value) {
  98                 if (!is_null($value))
  99                         $this->where[$field] = $value;
 100         }
 101
 102         protected function addWhereRange($field, $dir, $start, $end) {
 103                 $isDirNewer = ($dir === 'newer');
 104                 $after = ($isDirNewer ? '>=' : '<=');
 105                 $before = ($isDirNewer ? '<=' : '>=');
 106                 $db = $this->getDB();
 107
 108                 if (!is_null($start))
 109                         $this->addWhere($field . $after . $db->addQuotes($start));
 110
 111                 if (!is_null($end))
 112                         $this->addWhere($field . $before . $db->addQuotes($end));
 113
 114                 if (!isset($this->options['ORDER BY']))
 115                         $this->addOption('ORDER BY', $field . ($isDirNewer ? '' : ' DESC'));
 116         }
 117
 118         protected function addOption($name, $value = null) {
 119                 if (is_null($value))
 120                         $this->options[] = $name;
 121                 else
 122                         $this->options[$name] = $value;
 123         }
 124
 125         protected function select($method) {
 126
 127                 // getDB has its own profileDBIn/Out calls
 128                 $db = $this->getDB();
 129
 130                 $this->profileDBIn();
 131                 $res = $db->select($this->tables, $this->fields, $this->where, $method, $this->options);
 132                 $this->profileDBOut();
 133
 134                 return $res;
 135         }
 136
 137         public static function addTitleInfo(&$arr, $title, $prefix='') {
 138                 $arr[$prefix . 'ns'] = intval($title->getNamespace());
 139                 $arr[$prefix . 'title'] = $title->getPrefixedText();
 140         }
 141
 142         /**
 143          * Override this method to request extra fields from the pageSet
 144          * using $pageSet->requestField('fieldName')
 145          */
 146         public function requestExtraData($pageSet) {
 147         }
 148
 149         /**
 150          * Get the main Query module
 151          */
 152         public function getQuery() {
 153                 return $this->mQueryModule;
 154         }
 155
 156         /**
 157          * Add sub-element under the page element with the given pageId.
 158          */
 159         protected function addPageSubItems($pageId, $data) {
 160                 $result = $this->getResult();
 161                 $result->setIndexedTagName($data, $this->getModulePrefix());
 162                 $result->addValue(array ('query', 'pages', intval($pageId)),
 163                         $this->getModuleName(),
 164                         $data);
 165         }
 166
 167         protected function setContinueEnumParameter($paramName, $paramValue) {
 168
 169                 $paramName = $this->encodeParamName($paramName);
 170                 $msg = array( $paramName => $paramValue );
 171
 172 //              This is an alternative continue format as a part of the URL string
 173 //              ApiResult :: setContent($msg, $paramName . '=' . urlencode($paramValue));
 174
 175                 $this->getResult()->addValue('query-continue', $this->getModuleName(), $msg);
 176         }
 177
 178         /**
 179          * Get the Query database connection (readonly)
 180          */
 181         protected function getDB() {
 182                 if (is_null($this->mDb))
 183                         $this->mDb = $this->getQuery()->getDB();
 184                 return $this->mDb;
 185         }
 186
 187         /**
 188          * Selects the query database connection with the given name.
 189          * If no such connection has been requested before, it will be created.
 190          * Subsequent calls with the same $name will return the same connection
 191          * as the first, regardless of $db or $groups new values.
 192          */
 193         public function selectNamedDB($name, $db, $groups) {
 194                 $this->mDb = $this->getQuery()->getNamedDB($name, $db, $groups);
 195         }
 196
 197         /**
 198          * Get the PageSet object to work on
 199          * @return ApiPageSet data
 200          */
 201         protected function getPageSet() {
 202                 return $this->getQuery()->getPageSet();
 203         }
 204
 205         /**
 206          * This is a very simplistic utility function
 207          * to convert a non-namespaced title string to a db key.
 208          * It will replace all ' ' with '_'
 209          */
 210         public static function titleToKey($title) {
 211                 return str_replace(' ', '_', $title);
 212         }
 213
 214         public static function keyToTitle($key) {
 215                 return str_replace('_', ' ', $key);
 216         }
 217
 218         public function getTokenFlag($tokenArr, $action) {
 219                 if ($this->getMain()->getRequest()->getVal('callback') !== null) {
 220                         // Don't do any session-specific data.
 221                         return false;
 222                 }
 223                 if (in_array($action, $tokenArr)) {
 224                         global $wgUser;
 225                         if ($wgUser->isAllowed($action))
 226                                 return true;
 227                         else
 228                                 $this->dieUsage("Action '$action' is not allowed for the current user", 'permissiondenied');
 229                 }
 230                 return false;
 231         }
 232
 233         public static function getBaseVersion() {
 234                 return __CLASS__ . ': $Id$';
 235         }
 236 }
 237
 238 /**
 239  * @addtogroup API
 240  */
 241 abstract class ApiQueryGeneratorBase extends ApiQueryBase {
 242
 243         private $mIsGenerator;
 244
 245         public function __construct($query, $moduleName, $paramPrefix = '') {
 246                 parent :: __construct($query, $moduleName, $paramPrefix);
 247                 $this->mIsGenerator = false;
 248         }
 249
 250         public function setGeneratorMode() {
 251                 $this->mIsGenerator = true;
 252         }
 253
 254         /**
 255          * Overrides base class to prepend 'g' to every generator parameter
 256          */
 257         public function encodeParamName($paramName) {
 258                 if ($this->mIsGenerator)
 259                         return 'g' . parent :: encodeParamName($paramName);
 260                 else
 261                         return parent :: encodeParamName($paramName);
 262         }
 263
 264         /**
 265          * Execute this module as a generator
 266          * @param $resultPageSet PageSet: All output should be appended to this object
 267          */
 268         public abstract function executeGenerator($resultPageSet);
 269 }
 270