Added support to return the QR code in SVG format

docs/swagger/paths/{shortCode}_qr-code.json

@@ -27,6 +27,19 @@
                     "maximum": 1000,
                     "default": 300
                 }
+            },
+            {
+                "name": "format",
+                "in": "query",
+                "description": "The format for the QR code image, being valid values png and svg. Not providing the param or providing any other value will fall back to png.",
+                "required": false,
+                "schema": {
+                    "type": "string",
+                    "enum": [
+                        "png",
+                        "svg"
+                    ]
+                }
             }
         ],
         "responses": {
@@ -38,6 +51,12 @@
                             "type": "string",
                             "format": "binary"
                         }
+                    },
+                    "image/svg+xml": {
+                        "schema": {
+                            "type": "string",
+                            "format": "binary"
+                        }
                     }
                 }
             }

module/Core/src/Action/QrCodeAction.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace Shlinkio\Shlink\Core\Action;
 
 use Endroid\QrCode\QrCode;
+use Endroid\QrCode\Writer\SvgWriter;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Http\Server\MiddlewareInterface;
@@ -51,6 +52,11 @@ class QrCodeAction implements MiddlewareInterface
         $qrCode->setSize($this->getSizeParam($request));
         $qrCode->setMargin(0);
 
+        $format = $request->getQueryParams()['format'] ?? 'png';
+        if ($format === 'svg') {
+            $qrCode->setWriter(new SvgWriter());
+        }
+
         return new QrCodeResponse($qrCode);
     }