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| 1 | <?php |
| 2 | /** |
| 3 | * Prefix search of page names. |
| 4 | * |
| 5 | * @license GPL-2.0-or-later |
| 6 | * @file |
| 7 | */ |
| 8 | |
| 9 | namespace MediaWiki\Search; |
| 10 | |
| 11 | use MediaWiki\HookContainer\HookRunner; |
| 12 | use MediaWiki\MediaWikiServices; |
| 13 | use MediaWiki\Title\Title; |
| 14 | use MediaWiki\Title\TitleParser; |
| 15 | use Wikimedia\Rdbms\IExpression; |
| 16 | use Wikimedia\Rdbms\LikeValue; |
| 17 | |
| 18 | /** |
| 19 | * Handles searching prefixes of titles and finding any page |
| 20 | * names that match. Used largely by the OpenSearch implementation. |
| 21 | * @deprecated Since 1.27, Use SearchEngine::defaultPrefixSearch or SearchEngine::completionSearch |
| 22 | * |
| 23 | * @stable to extend |
| 24 | * @ingroup Search |
| 25 | */ |
| 26 | abstract class PrefixSearch { |
| 27 | /** |
| 28 | * Do a prefix search of titles and return a list of matching page names. |
| 29 | * |
| 30 | * @param string $search |
| 31 | * @param int $limit |
| 32 | * @param array $namespaces Used if query is not explicitly prefixed |
| 33 | * @param int $offset How many results to offset from the beginning |
| 34 | * @return (Title|string)[] |
| 35 | */ |
| 36 | public function search( $search, $limit, $namespaces = [], $offset = 0 ) { |
| 37 | $search = trim( $search ); |
| 38 | if ( $search == '' ) { |
| 39 | return []; // Return empty result |
| 40 | } |
| 41 | |
| 42 | $hasNamespace = SearchEngine::parseNamespacePrefixes( $search, false, true ); |
| 43 | if ( $hasNamespace !== false ) { |
| 44 | [ $search, $namespaces ] = $hasNamespace; |
| 45 | } |
| 46 | |
| 47 | return $this->searchBackend( $namespaces, $search, $limit, $offset ); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Do a prefix search for all possible variants of the prefix |
| 52 | * @param string $search |
| 53 | * @param int $limit |
| 54 | * @param array $namespaces |
| 55 | * @param int $offset How many results to offset from the beginning |
| 56 | * |
| 57 | * @return (Title|string)[] |
| 58 | */ |
| 59 | public function searchWithVariants( $search, $limit, array $namespaces, $offset = 0 ) { |
| 60 | $searches = $this->search( $search, $limit, $namespaces, $offset ); |
| 61 | |
| 62 | // if the content language has variants, try to retrieve fallback results |
| 63 | $fallbackLimit = $limit - count( $searches ); |
| 64 | if ( $fallbackLimit > 0 ) { |
| 65 | $services = MediaWikiServices::getInstance(); |
| 66 | $fallbackSearches = $services->getLanguageConverterFactory() |
| 67 | ->getLanguageConverter( $services->getContentLanguage() ) |
| 68 | ->autoConvertToAllVariants( $search ); |
| 69 | $fallbackSearches = array_diff( array_unique( $fallbackSearches ), [ $search ] ); |
| 70 | |
| 71 | foreach ( $fallbackSearches as $fbs ) { |
| 72 | $fallbackSearchResult = $this->search( $fbs, $fallbackLimit, $namespaces ); |
| 73 | $searches = array_merge( $searches, $fallbackSearchResult ); |
| 74 | $fallbackLimit -= count( $fallbackSearchResult ); |
| 75 | |
| 76 | if ( $fallbackLimit == 0 ) { |
| 77 | break; |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | return $searches; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * When implemented in a descendant class, receives an array of Title objects and returns |
| 86 | * either an unmodified array or an array of strings corresponding to titles passed to it. |
| 87 | * |
| 88 | * @param Title[] $titles |
| 89 | * @return (Title|string)[] |
| 90 | */ |
| 91 | abstract protected function titles( array $titles ); |
| 92 | |
| 93 | /** |
| 94 | * When implemented in a descendant class, receives an array of titles as strings and returns |
| 95 | * either an unmodified array or an array of Title objects corresponding to strings received. |
| 96 | * |
| 97 | * @param string[] $strings |
| 98 | * @return (Title|string)[] |
| 99 | */ |
| 100 | abstract protected function strings( array $strings ); |
| 101 | |
| 102 | /** |
| 103 | * Do a prefix search of titles and return a list of matching page names. |
| 104 | * @param int[] $namespaces |
| 105 | * @param string $search |
| 106 | * @param int $limit |
| 107 | * @param int $offset How many results to offset from the beginning |
| 108 | * @return (Title|string)[] |
| 109 | */ |
| 110 | protected function searchBackend( $namespaces, $search, $limit, $offset ) { |
| 111 | if ( count( $namespaces ) == 1 ) { |
| 112 | $ns = $namespaces[0]; |
| 113 | if ( $ns == NS_MEDIA ) { |
| 114 | $namespaces = [ NS_FILE ]; |
| 115 | } elseif ( $ns == NS_SPECIAL ) { |
| 116 | return $this->titles( $this->specialSearch( $search, $limit, $offset ) ); |
| 117 | } |
| 118 | } |
| 119 | $srchres = []; |
| 120 | if ( ( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) )->onPrefixSearchBackend( |
| 121 | $namespaces, $search, $limit, $srchres, $offset ) |
| 122 | ) { |
| 123 | return $this->titles( $this->defaultSearchBackend( $namespaces, $search, $limit, $offset ) ); |
| 124 | } |
| 125 | return $this->strings( |
| 126 | $this->handleResultFromHook( $srchres, $namespaces, $search, $limit, $offset ) ); |
| 127 | } |
| 128 | |
| 129 | private function handleResultFromHook( |
| 130 | array $srchres, array $namespaces, string $search, int $limit, int $offset |
| 131 | ): array { |
| 132 | if ( $offset === 0 ) { |
| 133 | // Only perform exact db match if offset === 0 |
| 134 | // This is still far from perfect but at least we avoid returning the |
| 135 | // same title again and again when the user is scrolling with a query |
| 136 | // that matches a title in the db. |
| 137 | $rescorer = new SearchExactMatchRescorer(); |
| 138 | $srchres = $rescorer->rescore( $search, $namespaces, $srchres, $limit ); |
| 139 | } |
| 140 | return $srchres; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Prefix search special-case for Special: namespace. |
| 145 | * |
| 146 | * @param string $search Term |
| 147 | * @param int $limit Max number of items to return |
| 148 | * @param int $offset Number of items to offset |
| 149 | * @return array |
| 150 | */ |
| 151 | protected function specialSearch( $search, $limit, $offset ) { |
| 152 | $searchParts = explode( '/', $search, 2 ); |
| 153 | $searchKey = $searchParts[0]; |
| 154 | $subpageSearch = $searchParts[1] ?? null; |
| 155 | |
| 156 | // Handle subpage search separately. |
| 157 | $spFactory = MediaWikiServices::getInstance()->getSpecialPageFactory(); |
| 158 | if ( $subpageSearch !== null ) { |
| 159 | // Try matching the full search string as a page name |
| 160 | $specialTitle = Title::makeTitleSafe( NS_SPECIAL, $searchKey ); |
| 161 | if ( !$specialTitle ) { |
| 162 | return []; |
| 163 | } |
| 164 | $special = $spFactory->getPage( $specialTitle->getText() ); |
| 165 | if ( $special ) { |
| 166 | $subpages = $special->prefixSearchSubpages( $subpageSearch, $limit, $offset ); |
| 167 | return array_map( $specialTitle->getSubpage( ... ), $subpages ); |
| 168 | } else { |
| 169 | return []; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | # normalize searchKey, so aliases with spaces can be found - T27675 |
| 174 | $contLang = MediaWikiServices::getInstance()->getContentLanguage(); |
| 175 | $searchKey = str_replace( ' ', '_', $searchKey ); |
| 176 | $searchKey = $contLang->caseFold( $searchKey ); |
| 177 | |
| 178 | // Unlike SpecialPage itself, we want the canonical forms of both |
| 179 | // canonical and alias title forms... |
| 180 | $keys = []; |
| 181 | $listedPages = $spFactory->getListedPages(); |
| 182 | foreach ( $listedPages as $page => $_obj ) { |
| 183 | $keys[$contLang->caseFold( $page )] = [ 'page' => $page, 'rank' => 0 ]; |
| 184 | } |
| 185 | |
| 186 | foreach ( $contLang->getSpecialPageAliases() as $page => $aliases ) { |
| 187 | // Exclude localisation aliases for pages that are not defined (T22885), |
| 188 | // e.g. if an extension registers a page based on site configuration. |
| 189 | if ( !in_array( $page, $spFactory->getNames() ) ) { |
| 190 | continue; |
| 191 | } |
| 192 | // Exclude aliases for unlisted pages |
| 193 | if ( !isset( $listedPages[$page] ) ) { |
| 194 | continue; |
| 195 | } |
| 196 | |
| 197 | foreach ( $aliases as $key => $alias ) { |
| 198 | $keys[$contLang->caseFold( $alias )] = [ 'page' => $alias, 'rank' => $key ]; |
| 199 | } |
| 200 | } |
| 201 | ksort( $keys ); |
| 202 | |
| 203 | $matches = []; |
| 204 | foreach ( $keys as $pageKey => $page ) { |
| 205 | if ( $searchKey === '' || str_starts_with( $pageKey, $searchKey ) ) { |
| 206 | // T29671: Don't use SpecialPage::getTitleFor() here because it |
| 207 | // localizes its input leading to searches for e.g. Special:All |
| 208 | // returning Spezial:MediaWiki-Systemnachrichten and returning |
| 209 | // Spezial:Alle_Seiten twice when $wgLanguageCode == 'de' |
| 210 | $matches[$page['rank']][] = Title::makeTitleSafe( NS_SPECIAL, $page['page'] ); |
| 211 | |
| 212 | if ( isset( $matches[0] ) && count( $matches[0] ) >= $limit + $offset ) { |
| 213 | // We have enough items in primary rank, no use to continue |
| 214 | break; |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | } |
| 219 | |
| 220 | // Ensure keys are in order |
| 221 | ksort( $matches ); |
| 222 | // Flatten the array |
| 223 | $matches = array_reduce( $matches, 'array_merge', [] ); |
| 224 | |
| 225 | return array_slice( $matches, $offset, $limit ); |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * Unless overridden by PrefixSearchBackend hook... |
| 230 | * This is case-sensitive (First character may |
| 231 | * be automatically capitalized by Title::secureAndSpit() |
| 232 | * later on depending on $wgCapitalLinks) |
| 233 | * |
| 234 | * @param int[]|null $namespaces Namespaces to search in |
| 235 | * @param string $search Term |
| 236 | * @param int $limit Max number of items to return |
| 237 | * @param int $offset Number of items to skip |
| 238 | * @return Title[] |
| 239 | */ |
| 240 | public function defaultSearchBackend( $namespaces, $search, $limit, $offset ) { |
| 241 | if ( !$namespaces ) { |
| 242 | $namespaces = [ NS_MAIN ]; |
| 243 | } |
| 244 | |
| 245 | if ( in_array( NS_SPECIAL, $namespaces ) ) { |
| 246 | // For now, if special is included, ignore the other namespaces |
| 247 | return $this->specialSearch( $search, $limit, $offset ); |
| 248 | } |
| 249 | |
| 250 | // Construct suitable prefix for each namespace. They differ in cases where |
| 251 | // some namespaces always capitalize and some don't. |
| 252 | $prefixes = []; |
| 253 | // Allow to do a prefix search for e.g. "Talk:" |
| 254 | if ( $search === '' ) { |
| 255 | $prefixes[$search] = $namespaces; |
| 256 | } else { |
| 257 | // Don't just ignore input like "[[Foo]]", but try to search for "Foo" |
| 258 | $search = preg_replace( TitleParser::getTitleInvalidRegex(), '', $search ); |
| 259 | foreach ( $namespaces as $namespace ) { |
| 260 | $title = Title::makeTitleSafe( $namespace, $search ); |
| 261 | if ( $title ) { |
| 262 | $prefixes[$title->getDBkey()][] = $namespace; |
| 263 | } |
| 264 | } |
| 265 | } |
| 266 | if ( !$prefixes ) { |
| 267 | return []; |
| 268 | } |
| 269 | |
| 270 | $services = MediaWikiServices::getInstance(); |
| 271 | $dbr = $services->getConnectionProvider()->getReplicaDatabase(); |
| 272 | // Often there is only one prefix that applies to all requested namespaces, |
| 273 | // but sometimes there are two if some namespaces do not always capitalize. |
| 274 | $conds = []; |
| 275 | foreach ( $prefixes as $prefix => $namespaces ) { |
| 276 | $expr = $dbr->expr( 'page_namespace', '=', $namespaces ); |
| 277 | if ( $prefix !== '' ) { |
| 278 | $expr = $expr->and( |
| 279 | 'page_title', |
| 280 | IExpression::LIKE, |
| 281 | new LikeValue( (string)$prefix, $dbr->anyString() ) |
| 282 | ); |
| 283 | } |
| 284 | $conds[] = $expr; |
| 285 | } |
| 286 | |
| 287 | $queryBuilder = $dbr->newSelectQueryBuilder() |
| 288 | ->select( [ 'page_id', 'page_namespace', 'page_title' ] ) |
| 289 | ->from( 'page' ) |
| 290 | ->where( $dbr->orExpr( $conds ) ) |
| 291 | ->orderBy( [ 'page_title', 'page_namespace' ] ) |
| 292 | ->limit( $limit ) |
| 293 | ->offset( $offset ); |
| 294 | $res = $queryBuilder->caller( __METHOD__ )->fetchResultSet(); |
| 295 | |
| 296 | return iterator_to_array( $services->getTitleFactory()->newTitleArrayFromResult( $res ) ); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | /** @deprecated class alias since 1.46 */ |
| 301 | class_alias( PrefixSearch::class, 'PrefixSearch' ); |