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<?php
namespace MediaWiki\Extension\QRLite;
use Endroid\QrCode\ErrorCorrectionLevel\ErrorCorrectionLevelHigh;
use Endroid\QrCode\ErrorCorrectionLevel\ErrorCorrectionLevelLow;
use Endroid\QrCode\ErrorCorrectionLevel\ErrorCorrectionLevelMedium;
use Endroid\QrCode\ErrorCorrectionLevel\ErrorCorrectionLevelQuartile;
use Endroid\QrCode\QrCode;
use Endroid\QrCode\Writer\PngWriter;
use Endroid\QrCode\Writer\SvgWriter;
use Exception;
use Html;
/**
* The actual QRLite Functions
*
* They can be used in a programmatic way through this class
* Use the static getId function as the main entry point
*
* @file
* @ingroup Extensions
*/
class QRLiteFunctions {
/**
* @param array $params
* @return string HTML for display of the QR code.
*/
public static function generateQRCode( $params = [] ) {
// Dependency check.
if ( !class_exists( QrCode::class ) ) {
return Html::errorBox( 'QRLite error: QrCode class not found, you may need to run "composer install".' );
}
// Defaults and escaping
$content = self::paramGet( $params, 'prefix', '___MAIN___' );
$format = self::paramGet( $params, 'format', 'png' );
$size = self::paramGet( $params, 'size', 6 );
$margin = self::paramGet( $params, 'margin', 0 );
$ecc = (int)self::paramGet( $params, 'ecc', 2 );
// TODO: Doesn't seem to work
$eccLevel = new ErrorCorrectionLevelMedium();
if ( $ecc === 1 ) {
$eccLevel = new ErrorCorrectionLevelLow();
} else {
if ( $ecc === 2 ) {
$eccLevel = new ErrorCorrectionLevelMedium();
} else {
if ( $ecc === 3 ) {
$eccLevel = new ErrorCorrectionLevelQuartile();
} else {
if ( $ecc === 4 ) {
$eccLevel = new ErrorCorrectionLevelHigh();
}
}
}
}
$image = '';
try {
$qrCode = new QrCode( $content );
$qrCode->setSize( $size * 30 );
$qrCode->setMargin( $margin );
$qrCode->setErrorCorrectionLevel( $eccLevel );
$writer = $format === 'svg' ? new SvgWriter() : new PngWriter();
$writerOptions = [
SvgWriter::WRITER_OPTION_EXCLUDE_XML_DECLARATION => true
];
$result = $writer->write( $qrCode, null, null, $writerOptions );
if ( $format === 'svg' ) {
$image = '<span class="svg-container" title="' . $content . '">' . $result->getString() . '</span>';
} else {
$image = Html::element( 'img', [ 'src' => $result->getDataUri(), 'title' => $content ] );
}
} catch ( Exception $e ) {
$image = '<span class="error-message">' . $e->getMessage() . '</span>';
}
$downloadButtons = '';
$result = '<span class="qrlite-result">' . $image . $downloadButtons . '</span>';
return $result;
}
//////////////////////////////////////////
// HELPER FUNCTIONS //
//////////////////////////////////////////
/**
* Helper function, that safely checks whether an array key exists
* and returns the trimmed value. If it doesn't exist, returns $default or null
*
* @param array $params
* @param string $key
* @param mixed|null $default
*
* @return mixed
*/
public static function paramGet( $params, $key, $default = null ) {
if ( isset( $params[$key] ) ) {
return trim( $params[$key] );
} else {
return $default;
}
}
/**
* Debug function that converts an object/array to a <pre> wrapped pretty printed JSON string
*
* @param mixed $obj
* @return string
*/
public static function toJSON( $obj ) {
header( 'Content-Type: application/json' );
echo json_encode( $obj, JSON_PRETTY_PRINT );
die();
}
}