TwoFactorAuth/lib/Providers/Qr/QRServerProvider.php

<?php declare(strict_types=1);

namespace RobThree\Auth\Providers\Qr;

/**
 * Use http://goqr.me/api/doc/create-qr-code/ to get QR code
 */
class QRServerProvider extends BaseHTTPQRCodeProvider
{
    public function __construct(protected bool $verifyssl = false, public string $errorcorrectionlevel = 'L', public int $margin = 4, public int $qzone = 1, public string $bgcolor = 'ffffff', public string $color = '000000', public string $format = 'png')
    {
    }

    public function getMimeType(): string
    {
        switch (strtolower($this->format)) {
            case 'png':
                return 'image/png';
            case 'gif':
                return 'image/gif';
            case 'jpg':
            case 'jpeg':
                return 'image/jpeg';
            case 'svg':
                return 'image/svg+xml';
            case 'eps':
                return 'application/postscript';
        }
        throw new QRException(sprintf('Unknown MIME-type: %s', $this->format));
    }

    public function getQRCodeImage(string $qrtext, int $size): string
    {
        return $this->getContent($this->getUrl($qrtext, $size));
    }

    public function getUrl(string $qrtext, int $size): string
    {
        return 'https://api.qrserver.com/v1/create-qr-code/'
            . '?size=' . $size . 'x' . $size
            . '&ecc=' . strtoupper($this->errorcorrectionlevel)
            . '&margin=' . $this->margin
            . '&qzone=' . $this->qzone
            . '&bgcolor=' . $this->decodeColor($this->bgcolor)
            . '&color=' . $this->decodeColor($this->color)
            . '&format=' . strtolower($this->format)
            . '&data=' . rawurlencode($qrtext);
    }

    private function decodeColor(string $value): string
    {
        return vsprintf('%d-%d-%d', sscanf($value, '%02x%02x%02x'));
    }
}