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<?php
use MediaWiki\MediaWikiServices;
class PDFEmbedHooks {
/**
* Sets up this extensions parser functions.
*
* @param Parser $parser
*/
public static function onParserFirstCallInit( Parser $parser ) {
$parser->setHook( 'pdf', [ __CLASS__, 'generateTag' ] );
}
/**
* Generates the PDF object tag.
*
* @param string $file Namespace prefixed article of the PDF file to display.
* @param array $args Arguments on the tag.
* @param Parser $parser
* @param PPFrame $frame
* @return string HTML
*/
public static function generateTag( $file, $args, Parser $parser, PPFrame $frame ) {
global $wgPdfEmbed;
$parser->getOutput()->updateCacheExpiry( 0 );
if ( strstr( $file, '{{{' ) !== false ) {
$file = $parser->recursiveTagParse( $file, $frame );
}
$context = RequestContext::getMain();
$request = $context->getRequest();
$services = MediaWikiServices::getInstance();
if ( $request->getVal( 'action' ) == 'edit' || $request->getVal( 'action' ) == 'submit' ) {
$user = $context->getUser();
} else {
$user = $services->getUserFactory()->newFromName(
$parser->getRevisionUser() ?? 'Unknown user'
);
}
if ( !$user ) {
return self::error( 'embed_pdf_invalid_user' );
}
if ( !$user->isAllowed( 'embed_pdf' ) ) {
return self::error( 'embed_pdf_no_permission' );
}
if ( !$file || !preg_match( '#(.+?)\.pdf#is', $file ) ) {
return self::error( 'embed_pdf_blank_file' );
}
$title = $services->getTitleFactory()->newFromText( $file );
if ( !$title ) {
return self::error( 'embed_pdf_blank_file' );
}
$file = $services->getRepoGroup()->findFile( $title );
if ( array_key_exists( 'width', $args ) ) {
$width = intval( $parser->recursiveTagParse( $args['width'], $frame ) );
} else {
$width = intval( $wgPdfEmbed['width'] );
}
if ( array_key_exists( 'height', $args ) ) {
$height = intval( $parser->recursiveTagParse( $args['height'], $frame ) );
} else {
$height = intval( $wgPdfEmbed['height'] );
}
if ( array_key_exists( 'page', $args ) ) {
$page = intval( $parser->recursiveTagParse( $args['page'], $frame ) );
} else {
$page = 1;
}
if ( $file !== false ) {
return self::embed( $file, $width, $height, $page );
} else {
return self::error( 'embed_pdf_invalid_file' );
}
}
/**
* Returns a HTML object as string.
*
* @param File $file
* @param int $width Width of the object.
* @param int $height Height of the object.
* @param int $page
* @return string HTML object.
*/
private static function embed( File $file, $width, $height, $page ) {
return Html::rawElement(
'iframe',
[
'width' => $width,
'height' => $height,
'src' => $file->getFullUrl() . '#page=' . $page,
'style' => 'max-width: 100%;',
'loading' => 'lazy',
]
);
}
/**
* Returns a standard error message.
*
* @param string $messageKey Error message key to display.
* @return string HTML error message.
*/
private static function error( $messageKey ) {
return Html::errorBox( wfMessage( $messageKey )->escaped() );
}
}