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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | * http://www.gnu.org/copyleft/gpl.html |
| 18 | * |
| 19 | * @file |
| 20 | * @since 1.28 |
| 21 | */ |
| 22 | |
| 23 | use MediaWiki\Context\IContextSource; |
| 24 | use Wikimedia\ParamValidator\ParamValidator; |
| 25 | use Wikimedia\ParamValidator\TypeDef\IntegerDef; |
| 26 | |
| 27 | /** |
| 28 | * Traits for API components that use a SearchEngine. |
| 29 | * @ingroup API |
| 30 | */ |
| 31 | trait SearchApi { |
| 32 | |
| 33 | private SearchEngineConfig $searchEngineConfig; |
| 34 | private SearchEngineFactory $searchEngineFactory; |
| 35 | |
| 36 | private function checkDependenciesSet() { |
| 37 | // Since this is a trait, we can't have a constructor where the services |
| 38 | // that we need are injected. Instead, the api modules that use this trait |
| 39 | // are responsible for setting them (since api modules *can* have services |
| 40 | // injected). Double check that the api module did indeed set them |
| 41 | // @phan-suppress-next-line PhanRedundantCondition Phan trusts the type hints too much |
| 42 | if ( !isset( $this->searchEngineConfig ) || !isset( $this->searchEngineFactory ) ) { |
| 43 | throw new LogicException( |
| 44 | 'SearchApi requires both a SearchEngineConfig and SearchEngineFactory to be set' |
| 45 | ); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * When $wgSearchType is null, $wgSearchAlternatives[0] is null. Null isn't |
| 51 | * a valid option for an array for PARAM_TYPE, so we'll use a fake name |
| 52 | * that can't possibly be a class name and describes what the null behavior |
| 53 | * does |
| 54 | */ |
| 55 | private static $BACKEND_NULL_PARAM = 'database-backed'; |
| 56 | |
| 57 | /** |
| 58 | * The set of api parameters that are shared between api calls that |
| 59 | * call the SearchEngine. Primarily this defines parameters that |
| 60 | * are utilized by self::buildSearchEngine(). |
| 61 | * |
| 62 | * @param bool $isScrollable True if the api offers scrolling |
| 63 | * @return array |
| 64 | */ |
| 65 | public function buildCommonApiParams( $isScrollable = true ) { |
| 66 | $this->checkDependenciesSet(); |
| 67 | |
| 68 | $params = [ |
| 69 | 'search' => [ |
| 70 | ParamValidator::PARAM_TYPE => 'string', |
| 71 | ParamValidator::PARAM_REQUIRED => true, |
| 72 | ], |
| 73 | 'namespace' => [ |
| 74 | ParamValidator::PARAM_DEFAULT => NS_MAIN, |
| 75 | ParamValidator::PARAM_TYPE => 'namespace', |
| 76 | ParamValidator::PARAM_ISMULTI => true, |
| 77 | ], |
| 78 | 'limit' => [ |
| 79 | ParamValidator::PARAM_DEFAULT => 10, |
| 80 | ParamValidator::PARAM_TYPE => 'limit', |
| 81 | IntegerDef::PARAM_MIN => 1, |
| 82 | IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1, |
| 83 | IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2, |
| 84 | ], |
| 85 | ]; |
| 86 | if ( $isScrollable ) { |
| 87 | $params['offset'] = [ |
| 88 | ParamValidator::PARAM_DEFAULT => 0, |
| 89 | IntegerDef::PARAM_MIN => 0, |
| 90 | ParamValidator::PARAM_TYPE => 'integer', |
| 91 | ApiBase::PARAM_HELP_MSG => 'api-help-param-continue', |
| 92 | ]; |
| 93 | } |
| 94 | |
| 95 | $alternatives = $this->searchEngineConfig->getSearchTypes(); |
| 96 | if ( count( $alternatives ) > 1 ) { |
| 97 | $alternatives[0] ??= self::$BACKEND_NULL_PARAM; |
| 98 | $params['backend'] = [ |
| 99 | ParamValidator::PARAM_DEFAULT => $this->searchEngineConfig->getSearchType(), |
| 100 | ParamValidator::PARAM_TYPE => $alternatives, |
| 101 | ]; |
| 102 | // @todo: support profile selection when multiple |
| 103 | // backends are available. The solution could be to |
| 104 | // merge all possible profiles and let ApiBase |
| 105 | // subclasses do the check. Making ApiHelp and ApiSandbox |
| 106 | // comprehensive might be more difficult. |
| 107 | } else { |
| 108 | $params += $this->buildProfileApiParam(); |
| 109 | } |
| 110 | |
| 111 | return $params; |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Build the profile api param definitions. Makes bold assumption only one search |
| 116 | * engine is available, ensure that is true before calling. |
| 117 | * |
| 118 | * @return array array containing available additional api param definitions. |
| 119 | * Empty if profiles are not supported by the searchEngine implementation. |
| 120 | * @suppress PhanTypeMismatchDimFetch |
| 121 | */ |
| 122 | private function buildProfileApiParam() { |
| 123 | $this->checkDependenciesSet(); |
| 124 | |
| 125 | $configs = $this->getSearchProfileParams(); |
| 126 | $searchEngine = $this->searchEngineFactory->create(); |
| 127 | $params = []; |
| 128 | foreach ( $configs as $paramName => $paramConfig ) { |
| 129 | $profiles = $searchEngine->getProfiles( |
| 130 | $paramConfig['profile-type'], |
| 131 | $this->getContext()->getUser() |
| 132 | ); |
| 133 | if ( !$profiles ) { |
| 134 | continue; |
| 135 | } |
| 136 | |
| 137 | $types = []; |
| 138 | $helpMessages = []; |
| 139 | $defaultProfile = null; |
| 140 | foreach ( $profiles as $profile ) { |
| 141 | $types[] = $profile['name']; |
| 142 | if ( isset( $profile['desc-message'] ) ) { |
| 143 | $helpMessages[$profile['name']] = $profile['desc-message']; |
| 144 | } |
| 145 | |
| 146 | if ( !empty( $profile['default'] ) ) { |
| 147 | $defaultProfile = $profile['name']; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | $params[$paramName] = [ |
| 152 | ParamValidator::PARAM_TYPE => $types, |
| 153 | ApiBase::PARAM_HELP_MSG => $paramConfig['help-message'], |
| 154 | ApiBase::PARAM_HELP_MSG_PER_VALUE => $helpMessages, |
| 155 | ParamValidator::PARAM_DEFAULT => $defaultProfile, |
| 156 | ]; |
| 157 | } |
| 158 | |
| 159 | return $params; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * Build the search engine to use. |
| 164 | * If $params is provided then the following searchEngine options |
| 165 | * will be set: |
| 166 | * - backend: which search backend to use |
| 167 | * - limit: mandatory |
| 168 | * - offset: optional |
| 169 | * - namespace: mandatory |
| 170 | * - search engine profiles defined by SearchApi::getSearchProfileParams() |
| 171 | * @param array|null $params API request params (must be sanitized by |
| 172 | * ApiBase::extractRequestParams() before) |
| 173 | * @return SearchEngine |
| 174 | */ |
| 175 | public function buildSearchEngine( array $params = null ) { |
| 176 | $this->checkDependenciesSet(); |
| 177 | |
| 178 | if ( $params == null ) { |
| 179 | return $this->searchEngineFactory->create(); |
| 180 | } |
| 181 | |
| 182 | $type = $params['backend'] ?? null; |
| 183 | if ( $type === self::$BACKEND_NULL_PARAM ) { |
| 184 | $type = null; |
| 185 | } |
| 186 | $searchEngine = $this->searchEngineFactory->create( $type ); |
| 187 | $searchEngine->setNamespaces( $params['namespace'] ); |
| 188 | $searchEngine->setLimitOffset( $params['limit'], $params['offset'] ?? 0 ); |
| 189 | |
| 190 | // Initialize requested search profiles. |
| 191 | $configs = $this->getSearchProfileParams(); |
| 192 | foreach ( $configs as $paramName => $paramConfig ) { |
| 193 | if ( isset( $params[$paramName] ) ) { |
| 194 | $searchEngine->setFeatureData( |
| 195 | $paramConfig['profile-type'], |
| 196 | $params[$paramName] |
| 197 | ); |
| 198 | } |
| 199 | } |
| 200 | return $searchEngine; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * @return array[] array of arrays mapping from parameter name to a two value map |
| 205 | * containing 'help-message' and 'profile-type' keys. |
| 206 | */ |
| 207 | abstract public function getSearchProfileParams(); |
| 208 | |
| 209 | /** |
| 210 | * @return IContextSource |
| 211 | */ |
| 212 | abstract public function getContext(); |
| 213 | } |