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<?php
namespace PragmaRX\Google2FA\Support;
use BaconQrCode\Renderer\Image\Png;
use BaconQrCode\Writer as BaconQrCodeWriter;
use PragmaRX\Google2FA\Exceptions\InsecureCallException;
trait QRCode
{
/**
* Sending your secret key to Google API is a security issue. Developer must explicitly allow it.
*/
protected $allowInsecureCallToGoogleApis = false;
/**
* Creates a Google QR code url.
*
* @param string $company
* @param string $holder
* @param string $secret
* @param int $size
*
* @throws InsecureCallException
*
* @return string
*/
public function getQRCodeGoogleUrl($company, $holder, $secret, $size = 200)
{
if (!$this->allowInsecureCallToGoogleApis) {
throw new InsecureCallException('It\'s not secure to send secret keys to Google Apis, you have to explicitly allow it by calling $google2fa->setAllowInsecureCallToGoogleApis(true).');
}
$url = $this->getQRCodeUrl($company, $holder, $secret);
return Url::generateGoogleQRCodeUrl('https://chart.googleapis.com/', 'chart', 'chs='.$size.'x'.$size.'&chld=M|0&cht=qr&chl=', $url);
}
/**
* Generates a QR code data url to display inline.
*
* @param string $company
* @param string $holder
* @param string $secret
* @param int $size
* @param string $encoding Default to UTF-8
*
* @return string
*/
public function getQRCodeInline($company, $holder, $secret, $size = 200, $encoding = 'utf-8')
{
$url = $this->getQRCodeUrl($company, $holder, $secret);
$renderer = new Png();
$renderer->setWidth($size);
$renderer->setHeight($size);
$bacon = new BaconQrCodeWriter($renderer);
$data = $bacon->writeString($url, $encoding);
return 'data:image/png;base64,'.base64_encode($data);
}
/**
* Creates a QR code url.
*
* @param $company
* @param $holder
* @param $secret
*
* @return string
*/
public function getQRCodeUrl($company, $holder, $secret)
{
return 'otpauth://totp/'.rawurlencode($company).':'.rawurlencode($holder).'?secret='.$secret.'&issuer='.rawurlencode($company).'';
}
/**
* AllowInsecureCallToGoogleApis setter.
*
* @param mixed $allowInsecureCallToGoogleApis
*
* @return QRCode
*/
public function setAllowInsecureCallToGoogleApis($allowInsecureCallToGoogleApis)
{
$this->allowInsecureCallToGoogleApis = $allowInsecureCallToGoogleApis;
return $this;
}
}
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