Merge pull request #39 from willpower232/bacon-qr-code-integration

integrate bacon qr code

Author: RobThree

lib/Providers/Qr/BaconQrCodeProvider.php

@@ -0,0 +1,152 @@
+<?php
+
+namespace RobThree\Auth\Providers\Qr;
+
+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;
+
+use BaconQrCode\Renderer\Image\EpsImageBackEnd;
+use BaconQrCode\Renderer\Image\ImageBackEndInterface;
+use BaconQrCode\Renderer\Image\ImagickImageBackEnd;
+use BaconQrCode\Renderer\Image\SvgImageBackEnd;
+
+class BaconQrCodeProvider implements IQRCodeProvider
+{
+    private $borderWidth = 4; // default from Bacon QR Code
+    private $backgroundColour;
+    private $foregroundColour;
+    private $format;
+
+    /**
+     * Ensure we using the latest Bacon QR Code and specify default options
+     *
+     * @param int $borderWidth space around the QR code, 4 is the default from Bacon QR Code
+     * @param string $backgroundColour hex reference for the background colour
+     * @param string $foregroundColour hex reference for the foreground colour
+     * @param string $format the desired output, png or svg
+     */
+    public function __construct($borderWidth = 4, $backgroundColour = '#ffffff', $foregroundColour = '#000000', $format = 'png')
+    {
+        if (! class_exists(ImagickImageBackEnd::class)) {
+            throw new \RuntimeException('Make sure you are using version 2 of Bacon QR Code');
+        }
+
+        $this->borderWidth = $borderWidth;
+        $this->backgroundColour = $this->handleColour($backgroundColour);
+        $this->foregroundColour = $this->handleColour($foregroundColour);
+        $this->format = strtolower($format);
+    }
+
+    /**
+     * Standard functions from IQRCodeProvider
+     */
+
+    public function getMimeType()
+    {
+        switch ($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 \RuntimeException(sprintf('Unknown MIME-type: %s', $this->format));
+    }
+
+    public function getQRCodeImage($qrText, $size)
+    {
+        switch ($this->format) {
+            case 'svg':
+                $backend = new SvgImageBackEnd;
+                break;
+            case 'eps':
+                $backend = new EpsImageBackEnd;
+                break;
+            default:
+                $backend = new ImagickImageBackEnd($this->format);
+        }
+
+        $output = $this->getQRCodeByBackend($qrText, $size, $backend);
+
+        if ($this->format == 'svg') {
+            $svg = explode("\n", $output);
+            return $svg[1];
+        }
+
+        return $output;
+    }
+
+    /**
+     * Abstract QR code generation function
+     * providing colour changing support
+     */
+    private function getQRCodeByBackend($qrText, $size, ImageBackEndInterface $backend)
+    {
+        $rendererStyleArgs = array($size, $this->borderWidth);
+
+        if (is_array($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)
+                )
+            ));
+        }
+
+        $writer = new Writer(new ImageRenderer(
+            new RendererStyle(...$rendererStyleArgs),
+            $backend
+        ));
+
+        return $writer->writeString($qrText);
+    }
+
+    /**
+     * 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($input) / 3);
+
+                // cope with three character hex reference
+                // three characters plus a # = 4
+                if (strlen($input) == 4) {
+                    array_walk($split, function (&$character) {
+                        $character = str_repeat($character, 2);
+                    });
+                }
+
+                // convert hex to rgb
+                return array_map('hexdec', $split);
+            };
+
+            return $hexToRGB($colour);
+        }
+
+        if (is_array($colour) && count($colour) == 3) {
+            return $colour;
+        }
+
+        throw new \RuntimeException('Invalid colour value');
+    }
+}