Implemented new ChartGoogleQrCodeProvider

lib/Providers/Qr/GoogleChartsQrCodeProvider.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace RobThree\Auth\Providers\Qr;
+
+// https://developers.google.com/chart/infographics/docs/qr_codes
+class GoogleChartsQrCodeProvider extends BaseHTTPQRCodeProvider
+{
+    /** @var string */
+    public $errorcorrectionlevel;
+
+    /** @var int */
+    public $margin;
+
+    /** @var string */
+    public $encoding;
+
+    /**
+     * @param bool $verifyssl
+     * @param string $errorcorrectionlevel
+     * @param int $margin
+     * @param string $encoding
+     */
+    public function __construct($verifyssl = false, $errorcorrectionlevel = 'L', $margin = 4, $encoding = 'UTF-8')
+    {
+        if (!is_bool($verifyssl)) { 
+            throw new QRException('VerifySSL must be bool'); 
+        }
+
+        $this->verifyssl = $verifyssl;
+
+        $this->errorcorrectionlevel = $errorcorrectionlevel;
+        $this->margin = $margin;
+        $this->encoding = $encoding;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getMimeType()
+    {
+        return 'image/png';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getQRCodeImage($qrtext, $size)
+    {
+        return $this->getContent($this->getUrl($qrtext, $size));   
+    }
+
+    /**
+     * @param string $qrtext the value to encode in the QR code
+     * @param int|string $size the desired size of the QR code
+     *
+     * @return string file contents of the QR code
+     */
+    public function getUrl($qrtext, $size)
+    {
+        return 'https://chart.googleapis.com/chart'
+            . '?chs=' . $size . 'x' . $size
+            . '&chld=' . urlencode(strtoupper($this->errorcorrectionlevel) . '|' . $this->margin)
+            . '&cht=' . 'qr'
+            . '&choe=' . $this->encoding
+            . '&chl=' . rawurlencode($qrtext);
+    }
+}