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<?php | ||
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namespace RobThree\Auth\Providers\Qr; | ||
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use BaconQrCode\Writer; | ||
use BaconQrCode\Renderer\ImageRenderer; | ||
use BaconQrCode\Renderer\RendererStyle\RendererStyle; | ||
use BaconQrCode\Renderer\RendererStyle\Fill; | ||
use BaconQrCode\Renderer\Color\Rgb; | ||
use BaconQrCode\Renderer\RendererStyle\EyeFill; | ||
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use BaconQrCode\Renderer\Image\ImageBackEndInterface; | ||
use BaconQrCode\Renderer\Image\ImagickImageBackEnd; | ||
use BaconQrCode\Renderer\Image\SvgImageBackEnd; | ||
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class BaconQrCodeProvider implements IQRCodeProvider | ||
{ | ||
private $borderWidth = 4; // default from Bacon QR Code | ||
private $backgroundColour; | ||
private $foregroundColour; | ||
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/** | ||
* Ensure we using the latest Bacon QR Code | ||
*/ | ||
public function __construct() | ||
{ | ||
if (! class_exists(ImagickImageBackEnd::class)) { | ||
throw new \RuntimeException('Make sure you are using version 2 of Bacon QR Code'); | ||
} | ||
} | ||
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/** | ||
* Standard functions from IQRCodeProvider | ||
*/ | ||
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public function getMimeType() | ||
{ | ||
return 'image/png'; | ||
} | ||
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public function getQRCodeImage($qrText, $size) | ||
{ | ||
return $this->getQRCodeByBackend($qrText, $size, new ImagickImageBackEnd); | ||
} | ||
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/** | ||
* Also provide SVG | ||
*/ | ||
public function getQRCodeSvg($qrText, $size) | ||
{ | ||
// strip XML tag to return only SVG | ||
$svg = explode("\n", $this->getQRCodeByBackend($qrText, $size, new SvgImageBackEnd)); | ||
return $svg[1]; | ||
} | ||
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/** | ||
* Abstract QR code generation function | ||
* providing colour changing support | ||
*/ | ||
public function getQRCodeByBackend($qrText, $size, ImageBackEndInterface $backend) | ||
{ | ||
$rendererStyleArgs = array($size, $this->borderWidth); | ||
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if (is_array($this->foregroundColour) && is_array($this->backgroundColour)) { | ||
$rendererStyleArgs = array_merge($rendererStyleArgs, array( | ||
null, | ||
null, | ||
Fill::withForegroundColor( | ||
new Rgb(...$this->backgroundColour), | ||
new Rgb(...$this->foregroundColour), | ||
new EyeFill(null, null), | ||
new EyeFill(null, null), | ||
new EyeFill(null, null) | ||
) | ||
)); | ||
} | ||
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$writer = new Writer(new ImageRenderer( | ||
new RendererStyle(...$rendererStyleArgs), | ||
$backend | ||
)); | ||
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return $writer->writeString($qrText); | ||
} | ||
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/** | ||
* Ensure colour is an array of three values but also | ||
* accept a string and assume its a 3 or 6 character hex | ||
*/ | ||
private function handleColour($colour) | ||
{ | ||
if (is_string($colour) && $colour[0] == '#') { | ||
$hexToRGB = function ($input) { | ||
// split the array into three chunks | ||
$split = str_split(trim($input, '#'), strlen($input) / 3); | ||
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// cope with three character hex reference | ||
// three characters plus a # = 4 | ||
if (strlen($input) == 4) { | ||
array_walk($split, function (&$character) { | ||
$character = str_repeat($character, 2); | ||
}); | ||
} | ||
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// convert hex to rgb | ||
return array_map('hexdec', $split); | ||
}; | ||
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return $hexToRGB($colour); | ||
} | ||
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if (is_array($colour) && count($colour) == 3) { | ||
return $colour; | ||
} | ||
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throw new \RuntimeException('Invalid colour value'); | ||
} | ||
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/** | ||
* Setters | ||
*/ | ||
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public function setBackgroundColour($colour) | ||
{ | ||
$this->backgroundColour = $this->handleColour($colour); | ||
} | ||
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public function setBorderWidth(int $width) | ||
{ | ||
$this->borderWidth = $width; | ||
} | ||
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public function setForegroundColour($colour) | ||
{ | ||
$this->foregroundColour = $this->handleColour($colour); | ||
} | ||
} |