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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\Math; |
| 4 | |
| 5 | use MediaWiki\Extension\Math\Render\RendererFactory; |
| 6 | use MediaWiki\SpecialPage\SpecialPage; |
| 7 | |
| 8 | /** |
| 9 | * Description of SpecialMathShowSVG |
| 10 | * |
| 11 | * @author Moritz Schubotz (Physikerwelt) |
| 12 | */ |
| 13 | class SpecialMathShowImage extends SpecialPage { |
| 14 | /** @var bool */ |
| 15 | private $noRender = false; |
| 16 | /** @var MathRenderer|null */ |
| 17 | private $renderer = null; |
| 18 | /** @var string */ |
| 19 | private $mode = MathConfig::MODE_MATHML; |
| 20 | |
| 21 | /** @var MathConfig */ |
| 22 | private $mathConfig; |
| 23 | |
| 24 | /** @var RendererFactory */ |
| 25 | private $rendererFactory; |
| 26 | |
| 27 | /** |
| 28 | * @param MathConfig $mathConfig |
| 29 | * @param RendererFactory $rendererFactory |
| 30 | */ |
| 31 | public function __construct( |
| 32 | MathConfig $mathConfig, |
| 33 | RendererFactory $rendererFactory |
| 34 | ) { |
| 35 | parent::__construct( |
| 36 | 'MathShowImage', |
| 37 | '', // Don't restrict |
| 38 | false // Don't show on Special:SpecialPages - it's not useful interactively |
| 39 | ); |
| 40 | $this->mathConfig = $mathConfig; |
| 41 | $this->rendererFactory = $rendererFactory; |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * Sets headers - this should be called from the execute() method of all derived classes! |
| 46 | * @param bool $success |
| 47 | */ |
| 48 | public function setHeaders( $success = true ) { |
| 49 | $out = $this->getOutput(); |
| 50 | $request = $this->getRequest(); |
| 51 | $out->setArticleBodyOnly( true ); |
| 52 | $out->setArticleRelated( false ); |
| 53 | $out->setRobotPolicy( "noindex,nofollow" ); |
| 54 | $out->disable(); |
| 55 | $request->response()->header( "Content-type: image/svg+xml; charset=utf-8" ); |
| 56 | if ( $success && !( $this->noRender ) ) { |
| 57 | $request->response()->header( |
| 58 | 'Cache-Control: public, s-maxage=604800, max-age=3600' |
| 59 | ); // 1 week (server) 1 hour (client) |
| 60 | $request->response()->header( 'Vary: User-Agent' ); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | public function execute( $par ) { |
| 65 | global $wgMathEnableExperimentalInputFormats; |
| 66 | $request = $this->getRequest(); |
| 67 | $hash = $request->getText( 'hash', '' ); |
| 68 | $tex = $request->getText( 'tex', '' ); |
| 69 | if ( $wgMathEnableExperimentalInputFormats ) { |
| 70 | $asciimath = $request->getText( 'asciimath', '' ); |
| 71 | } else { |
| 72 | $asciimath = ''; |
| 73 | } |
| 74 | $this->mode = MathConfig::normalizeRenderingMode( $request->getText( 'mode' ) ); |
| 75 | if ( !$this->mathConfig->isValidRenderingMode( $this->mode ) ) { |
| 76 | // Fallback to the default if an invalid mode was specified |
| 77 | $this->mode = MathConfig::MODE_MATHML; |
| 78 | } |
| 79 | if ( $hash === '' && $tex === '' && $asciimath === '' ) { |
| 80 | $this->setHeaders( false ); |
| 81 | echo $this->printSvgError( 'No Inputhash specified' ); |
| 82 | } else { |
| 83 | if ( $tex === '' && $asciimath === '' ) { |
| 84 | $this->renderer = $this->rendererFactory->getFromHash( $hash ); |
| 85 | $this->noRender = $request->getBool( 'noRender', false ); |
| 86 | $isInDatabase = $this->renderer->readFromCache(); |
| 87 | if ( $isInDatabase || $this->noRender ) { |
| 88 | $success = $isInDatabase; |
| 89 | } else { |
| 90 | $success = $this->renderer->render(); |
| 91 | } |
| 92 | } elseif ( $asciimath === '' ) { |
| 93 | $this->renderer = $this->rendererFactory->getRenderer( $tex, [], $this->mode ); |
| 94 | $success = $this->renderer->render(); |
| 95 | } else { |
| 96 | $this->renderer = $this->rendererFactory->getRenderer( |
| 97 | $asciimath, [ 'type' => 'ascii' ], $this->mode |
| 98 | ); |
| 99 | $success = $this->renderer->render(); |
| 100 | } |
| 101 | if ( $success ) { |
| 102 | $output = $this->renderer->getSvg(); |
| 103 | } else { |
| 104 | $output = $this->printSvgError( $this->renderer->getLastError() ); |
| 105 | } |
| 106 | if ( $output == "" ) { |
| 107 | $output = $this->printSvgError( 'No Output produced' ); |
| 108 | $success = false; |
| 109 | } |
| 110 | $this->setHeaders( $success ); |
| 111 | echo $output; |
| 112 | if ( $success ) { |
| 113 | $this->renderer->writeCache(); |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Prints the specified error message as svg. |
| 120 | * @param string $msg error message, HTML escaped |
| 121 | * @return string xml svg image with the error message |
| 122 | */ |
| 123 | private function printSvgError( $msg ) { |
| 124 | global $wgDebugComments; |
| 125 | $result = <<<SVG |
| 126 | <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 4" preserveAspectRatio="xMidYMid meet" > |
| 127 | <text text-anchor="start" fill="red" y="2"> |
| 128 | $msg |
| 129 | </text> |
| 130 | </svg> |
| 131 | SVG; |
| 132 | if ( $wgDebugComments ) { |
| 133 | $result .= '<!--' . var_export( $this->renderer, true ) . '-->'; |
| 134 | } |
| 135 | return $result; |
| 136 | } |
| 137 | |
| 138 | protected function getGroupName() { |
| 139 | return 'other'; |
| 140 | } |
| 141 | } |