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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Copyright (C) 2011-2020 Wikimedia Foundation and others. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | */ |
| 20 | |
| 21 | namespace MediaWiki\Rest\Handler; |
| 22 | |
| 23 | use ApiOpenSearch; |
| 24 | use MediaWiki\Config\Config; |
| 25 | use MediaWiki\HookContainer\HookRunner; |
| 26 | use MediaWiki\MainConfigNames; |
| 27 | use MediaWiki\MainConfigSchema; |
| 28 | use MediaWiki\Rest\Handler; |
| 29 | use MediaWiki\Rest\Response; |
| 30 | use MediaWiki\Rest\StringStream; |
| 31 | use MediaWiki\SpecialPage\SpecialPage; |
| 32 | use MediaWiki\Utils\UrlUtils; |
| 33 | use MediaWiki\Xml\Xml; |
| 34 | use Wikimedia\Http\HttpAcceptParser; |
| 35 | |
| 36 | /** |
| 37 | * Handler for generating an OpenSearch description document. |
| 38 | * In a nutshell, this tells browsers how and where |
| 39 | * to submit search queries to get a search results page back, |
| 40 | * as well as how to get typeahead suggestions (see ApiOpenSearch). |
| 41 | * |
| 42 | * This class handles the following routes: |
| 43 | * - /v1/search |
| 44 | * |
| 45 | * @see https://github.com/dewitt/opensearch |
| 46 | * @see https://www.opensearch.org |
| 47 | */ |
| 48 | class OpenSearchDescriptionHandler extends Handler { |
| 49 | |
| 50 | private UrlUtils $urlUtils; |
| 51 | |
| 52 | /** @see MainConfigSchema::Favicon */ |
| 53 | private string $favicon; |
| 54 | |
| 55 | /** @see MainConfigSchema::OpenSearchTemplates */ |
| 56 | private array $templates; |
| 57 | |
| 58 | public function __construct( Config $config, UrlUtils $urlUtils ) { |
| 59 | $this->favicon = $config->get( MainConfigNames::Favicon ); |
| 60 | $this->templates = $config->get( MainConfigNames::OpenSearchTemplates ); |
| 61 | $this->urlUtils = $urlUtils; |
| 62 | } |
| 63 | |
| 64 | public function execute(): Response { |
| 65 | $ctype = $this->getContentType(); |
| 66 | |
| 67 | $response = $this->getResponseFactory()->create(); |
| 68 | $response->setHeader( 'Content-type', $ctype ); |
| 69 | |
| 70 | // Set an Expires header so that CDN can cache it for a short time |
| 71 | // Short enough so that the sysadmin barely notices when $wgSitename is changed |
| 72 | $expiryTime = 600; # 10 minutes |
| 73 | $response->setHeader( 'Expires', gmdate( 'D, d M Y H:i:s', time() + $expiryTime ) . ' GMT' ); |
| 74 | $response->setHeader( 'Cache-control', 'max-age=600' ); |
| 75 | |
| 76 | $body = new StringStream(); |
| 77 | |
| 78 | $body->write( '<?xml version="1.0"?>' ); |
| 79 | $body->write( Xml::openElement( 'OpenSearchDescription', |
| 80 | [ |
| 81 | 'xmlns' => 'http://a9.com/-/spec/opensearch/1.1/', |
| 82 | 'xmlns:moz' => 'http://www.mozilla.org/2006/browser/search/' ] ) ); |
| 83 | |
| 84 | // The spec says the ShortName must be no longer than 16 characters, |
| 85 | // but 16 is *realllly* short. In practice, browsers don't appear to care |
| 86 | // when we give them a longer string, so we're no longer attempting to trim. |
| 87 | // |
| 88 | // Note: ShortName and the <link title=""> need to match; they are used as |
| 89 | // a key for identifying if the search engine has been added already, *and* |
| 90 | // as the display name presented to the end-user. |
| 91 | // |
| 92 | // Behavior seems about the same between Firefox and IE 7/8 here. |
| 93 | // 'Description' doesn't appear to be used by either. |
| 94 | $fullName = wfMessage( 'opensearch-desc' )->inContentLanguage()->text(); |
| 95 | $body->write( Xml::element( 'ShortName', null, $fullName ) ); |
| 96 | $body->write( Xml::element( 'Description', null, $fullName ) ); |
| 97 | |
| 98 | // By default we'll use the site favicon. |
| 99 | // Double-check if IE supports this properly? |
| 100 | $body->write( Xml::element( 'Image', |
| 101 | [ |
| 102 | 'height' => 16, |
| 103 | 'width' => 16, |
| 104 | 'type' => 'image/x-icon' |
| 105 | ], |
| 106 | (string)$this->urlUtils->expand( $this->favicon, PROTO_CURRENT ) |
| 107 | ) ); |
| 108 | |
| 109 | $urls = []; |
| 110 | |
| 111 | // General search template. Given an input term, this should bring up |
| 112 | // search results or a specific found page. |
| 113 | // At least Firefox and IE 7 support this. |
| 114 | $searchPage = SpecialPage::getTitleFor( 'Search' ); |
| 115 | $urls[] = [ |
| 116 | 'type' => 'text/html', |
| 117 | 'method' => 'get', |
| 118 | 'template' => $searchPage->getCanonicalURL( 'search={searchTerms}' ) ]; |
| 119 | |
| 120 | // TODO: add v1/search/ endpoints? |
| 121 | |
| 122 | foreach ( $this->templates as $type => $template ) { |
| 123 | if ( !$template ) { |
| 124 | $template = ApiOpenSearch::getOpenSearchTemplate( $type ); |
| 125 | } |
| 126 | |
| 127 | if ( $template ) { |
| 128 | $urls[] = [ |
| 129 | 'type' => $type, |
| 130 | 'method' => 'get', |
| 131 | 'template' => $template, |
| 132 | ]; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | // Allow hooks to override the suggestion URL settings in a more |
| 137 | // general way than overriding the whole search engine... |
| 138 | ( new HookRunner( $this->getHookContainer() ) )->onOpenSearchUrls( $urls ); |
| 139 | |
| 140 | foreach ( $urls as $attribs ) { |
| 141 | $body->write( Xml::element( 'Url', $attribs ) ); |
| 142 | } |
| 143 | |
| 144 | // And for good measure, add a link to the straight search form. |
| 145 | // This is a custom format extension for Firefox, which otherwise |
| 146 | // sends you to the domain root if you hit "enter" with an empty |
| 147 | // search box. |
| 148 | $body->write( Xml::element( 'moz:SearchForm', null, |
| 149 | $searchPage->getCanonicalURL() ) ); |
| 150 | |
| 151 | $body->write( Xml::closeElement( 'OpenSearchDescription' ) ); |
| 152 | |
| 153 | $response->setBody( $body ); |
| 154 | return $response; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Returns the content-type to use for the response. |
| 159 | * Will be either 'application/xml' or 'application/opensearchdescription+xml', |
| 160 | * depending on the client's preference. |
| 161 | * |
| 162 | * @return string |
| 163 | */ |
| 164 | private function getContentType(): string { |
| 165 | $params = $this->getValidatedParams(); |
| 166 | if ( $params['ctype'] == 'application/xml' ) { |
| 167 | // Makes testing tweaks about a billion times easier |
| 168 | return 'application/xml'; |
| 169 | } |
| 170 | |
| 171 | $acceptHeader = $this->getRequest()->getHeader( 'accept' ); |
| 172 | |
| 173 | if ( $acceptHeader ) { |
| 174 | $parser = new HttpAcceptParser(); |
| 175 | $acceptableTypes = $parser->parseAccept( $acceptHeader[0] ); |
| 176 | |
| 177 | foreach ( $acceptableTypes as $acc ) { |
| 178 | if ( $acc['type'] === 'application/xml' ) { |
| 179 | return 'application/xml'; |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | return 'application/opensearchdescription+xml'; |
| 185 | } |
| 186 | |
| 187 | public function getParamSettings() { |
| 188 | return [ |
| 189 | 'ctype' => [ |
| 190 | self::PARAM_SOURCE => 'query', |
| 191 | ] |
| 192 | ]; |
| 193 | } |
| 194 | |
| 195 | } |