includes/changes/ChangesListStringOptionsFilterGroup.php

   1 <?php
   2 /**
   3  * Represents a filter group (used on ChangesListSpecialPage and descendants)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @license GPL 2+
  22  * @author Matthew Flaschen
  23  */
  24
  25 use Wikimedia\Rdbms\IDatabase;
  26
  27 /**
  28  * Represents a filter group with multiple string options. They are passed to the server as
  29  * a single form parameter separated by a delimiter.  The parameter name is the
  30  * group name.  E.g. groupname=opt1;opt2 .
  31  *
  32  * If all options are selected they are replaced by the term "all".
  33  *
  34  * There is also a single DB query modification for the whole group.
  35  *
  36  * @since 1.29
  37  */
  38
  39 class ChangesListStringOptionsFilterGroup extends ChangesListFilterGroup {
  40         /**
  41          * Type marker, used by JavaScript
  42          */
  43         const TYPE = 'string_options';
  44
  45         /**
  46          * Delimiter
  47          */
  48         const SEPARATOR = ';';
  49
  50         /**
  51          * Signifies that all options in the group are selected.
  52          */
  53         const ALL = 'all';
  54
  55         /**
  56          * Signifies that no options in the group are selected, meaning the group has no effect.
  57          *
  58          * For full-coverage groups, this is the same as ALL if all filters are allowed.
  59          * For others, it is not.
  60          */
  61         const NONE = '';
  62
  63         /**
  64          * Group name; used as form parameter.
  65          *
  66          * @var string $name
  67          */
  68
  69         /**
  70          * Defaul parameter value
  71          *
  72          * @var string $defaultValue
  73          */
  74         protected $defaultValue;
  75
  76         /**
  77          * Callable used to do the actual query modification; see constructor
  78          *
  79          * @var callable $queryCallable
  80          */
  81         protected $queryCallable;
  82
  83         /**
  84          * Create a new filter group with the specified configuration
  85          *
  86          * @param array $groupDefinition Configuration of group
  87          * * $groupDefinition['name'] string Group name
  88          * * $groupDefinition['title'] string i18n key for title (optional, can be omitted
  89          * *  only if none of the filters in the group display in the structured UI)
  90          * * $groupDefinition['priority'] int Priority integer.  Higher means higher in the
  91          * *  group list.
  92          * * $groupDefinition['filters'] array Numeric array of filter definitions, each of which
  93          * *  is an associative array to be passed to the filter constructor.  However,
  94          * *  'priority' is optional for the filters.  Any filter that has priority unset
  95          * *  will be put to the bottom, in the order given.
  96          * * $groupDefinition['default'] string Default for group.
  97          * * $groupDefinition['isFullCoverage'] bool Whether the group is full coverage;
  98          * *  if true, this means that checking every item in the group means no
  99          * *  changes list entries are filtered out.
 100          * * $groupDefinition['queryCallable'] callable Callable accepting parameters:
 101          * *  string $specialPageClassName Class name of current special page
 102          * *  IContextSource $context Context, for e.g. user
 103          * *  IDatabase $dbr Database, for addQuotes, makeList, and similar
 104          * *  array &$tables Array of tables; see IDatabase::select $table
 105          * *  array &$fields Array of fields; see IDatabase::select $vars
 106          * *  array &$conds Array of conditions; see IDatabase::select $conds
 107          * *  array &$query_options Array of query options; see IDatabase::select $options
 108          * *  array &$join_conds Array of join conditions; see IDatabase::select $join_conds
 109          * *  array $selectedValues The allowed and requested values, lower-cased and sorted
 110          */
 111         public function __construct( array $groupDefinition ) {
 112                 if ( !isset( $groupDefinition['isFullCoverage'] ) ) {
 113                         throw new MWException( 'You must specify isFullCoverage' );
 114                 }
 115
 116                 $groupDefinition['type'] = self::TYPE;
 117
 118                 parent::__construct( $groupDefinition );
 119
 120                 $this->queryCallable = $groupDefinition['queryCallable'];
 121
 122                 if ( isset( $groupDefinition['default'] ) ) {
 123                         $this->setDefault( $groupDefinition['default'] );
 124                 } else {
 125                         throw new MWException( 'You must specify a default' );
 126                 }
 127         }
 128
 129         /**
 130          * @inheritdoc
 131          */
 132         public function isPerGroupRequestParameter() {
 133                 return true;
 134         }
 135
 136         /**
 137          * Sets default of filter group.
 138          *
 139          * @param string $defaultValue
 140          */
 141         public function setDefault( $defaultValue ) {
 142                 $this->defaultValue = $defaultValue;
 143         }
 144
 145         /**
 146          * Gets default of filter group
 147          *
 148          * @return string $defaultValue
 149          */
 150         public function getDefault() {
 151                 return $this->defaultValue;
 152         }
 153
 154         /**
 155          * @inheritdoc
 156          */
 157         protected function createFilter( array $filterDefinition ) {
 158                 return new ChangesListStringOptionsFilter( $filterDefinition );
 159         }
 160
 161         /**
 162          * Registers a filter in this group
 163          *
 164          * @param ChangesListStringOptionsFilter $filter ChangesListStringOptionsFilter
 165          */
 166         public function registerFilter( ChangesListStringOptionsFilter $filter ) {
 167                 $this->filters[$filter->getName()] = $filter;
 168         }
 169
 170         /**
 171          * Modifies the query to include the filter group.
 172          *
 173          * The modification is only done if the filter group is in effect.  This means that
 174          * one or more valid and allowed filters were selected.
 175          *
 176          * @param IDatabase $dbr Database, for addQuotes, makeList, and similar
 177          * @param ChangesListSpecialPage $specialPage Current special page
 178          * @param array &$tables Array of tables; see IDatabase::select $table
 179          * @param array &$fields Array of fields; see IDatabase::select $vars
 180          * @param array &$conds Array of conditions; see IDatabase::select $conds
 181          * @param array &$query_options Array of query options; see IDatabase::select $options
 182          * @param array &$join_conds Array of join conditions; see IDatabase::select $join_conds
 183          * @param string $value URL parameter value
 184          */
 185         public function modifyQuery( IDatabase $dbr, ChangesListSpecialPage $specialPage,
 186                 &$tables, &$fields, &$conds, &$query_options, &$join_conds, $value ) {
 187
 188                 $allowedFilterNames = [];
 189                 foreach ( $this->filters as $filter ) {
 190                         if ( $filter->isAllowed( $specialPage ) ) {
 191                                 $allowedFilterNames[] = $filter->getName();
 192                         }
 193                 }
 194
 195                 if ( $value === self::ALL ) {
 196                         $selectedValues = $allowedFilterNames;
 197                 } else {
 198                         $selectedValues = explode( self::SEPARATOR, strtolower( $value ) );
 199
 200                         // remove values that are not recognized or not currently allowed
 201                         $selectedValues = array_intersect(
 202                                 $selectedValues,
 203                                 $allowedFilterNames
 204                         );
 205                 }
 206
 207                 // If there are now no values, because all are disallowed or invalid (also,
 208                 // the user may not have selected any), this is a no-op.
 209
 210                 // If everything is unchecked, the group always has no effect, regardless
 211                 // of full-coverage.
 212                 if ( count( $selectedValues ) === 0 ) {
 213                         return;
 214                 }
 215
 216                 sort( $selectedValues );
 217
 218                 call_user_func_array(
 219                         $this->queryCallable,
 220                         [
 221                                 get_class( $specialPage ),
 222                                 $specialPage->getContext(),
 223                                 $dbr,
 224                                 &$tables,
 225                                 &$fields,
 226                                 &$conds,
 227                                 &$query_options,
 228                                 &$join_conds,
 229                                 $selectedValues
 230                         ]
 231                 );
 232         }
 233
 234         /**
 235          * @inheritdoc
 236          */
 237         public function getJsData( ChangesListSpecialPage $specialPage ) {
 238                 $output = parent::getJsData( $specialPage );
 239
 240                 $output['separator'] = self::SEPARATOR;
 241                 $output['default'] = $this->getDefault();
 242
 243                 return $output;
 244         }
 245 }