fix: allowed output file protocols on Windows

.github/workflows/build.yaml

@@ -83,3 +83,45 @@ jobs:
             - run: composer update --prefer-dist --no-interaction --no-progress --ansi ${{ matrix.composer_option }}
             - run: vendor/bin/phpunit
             - run: vendor/bin/phpstan analyse --ansi --no-progress
+    tests-windows:
+        runs-on: windows-2022
+        strategy:
+            fail-fast: false
+            matrix:
+                include:
+                    - description: 'Symfony 6.4 DEV'
+                      php: '8.2'
+                      symfony: '6.4.*@dev'
+                    - description: 'Symfony 6.3'
+                      php: '8.3'
+                      symfony: '6.3.*'
+                    - description: 'Symfony 6.3'
+                      php: '8.2'
+                      symfony: '6.3.*'
+        name: "[WINDOWS] PHP ${{ matrix.php }} tests (${{ matrix.description }})"
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v3
+            - name: Cache
+              uses: actions/cache@v3
+              with:
+                  path: ~/.composer/cache/files
+                  key: composer-${{ matrix.php }}-${{ matrix.symfony }}-${{ matrix.composer_option }}
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+            - run: |
+                  (Get-Content composer.json) -replace '("symfony/[^"]+": )"[^"]+"', '$1"${{ matrix.symfony }}"' | Out-File -encoding ASCII composer.json
+              if: matrix.symfony
+            - run: |
+                  composer config minimum-stability dev
+                  composer config prefer-stable true
+              if: matrix.beta
+            - name: remove cs-fixer for Symfony 6
+              if: contains(matrix.symfony, '6.4.*@dev')
+              run: |
+                  composer remove --dev friendsofphp/php-cs-fixer pedrotroller/php-cs-custom-fixer --no-update
+            - run: composer update --prefer-dist --no-interaction --no-progress --ansi ${{ matrix.composer_option }}
+            - run: vendor/bin/phpunit
+            - run: vendor/bin/phpstan analyse --ansi --no-progress

src/Knp/Snappy/AbstractGenerator.php

@@ -21,6 +21,10 @@ abstract class AbstractGenerator implements GeneratorInterface, LoggerAwareInter
 {
     use LoggerAwareTrait;
 
+    protected const ALLOWED_PROTOCOLS = ['file'];
+
+    protected const WINDOWS_LOCAL_FILENAME_REGEX = '/^[a-z]:(?:[\\\\\/]?(?:[\w\s!#()-]+|[\.]{1,2})+)*[\\\\\/]?/i';
+
     /**
      * @var array
      */
@@ -625,13 +629,8 @@ protected function executeCommand($command)
      */
     protected function prepareOutput($filename, $overwrite)
     {
-        if (false === $parsedFilename = \parse_url($filename)) {
-            throw new InvalidArgumentException('The output filename is invalid.');
-        }
-
-        $scheme = isset($parsedFilename['scheme']) ? \mb_strtolower($parsedFilename['scheme']) : '';
-        if ($scheme !== '' && $scheme !== 'file') {
-            throw new InvalidArgumentException(\sprintf('The output file scheme is not supported. Expected \'\' or \'file\' but got \'%s\'.', $scheme));
+        if (!$this->isProtocolAllowed($filename)) {
+            throw new InvalidArgumentException(\sprintf('The output file scheme is not supported. Expected one of [\'%s\'].', \implode('\', \'', self::ALLOWED_PROTOCOLS)));
         }
 
         $directory = \dirname($filename);
@@ -651,6 +650,34 @@ protected function prepareOutput($filename, $overwrite)
         }
     }
 
+    /**
+     * Verifies if the given filename has a supported protocol.
+     *
+     * @param string $filename
+     *
+     * @throws InvalidArgumentException
+     *
+     * @return bool
+     */
+    protected function isProtocolAllowed($filename)
+    {
+        if (false === $parsedFilename = \parse_url($filename)) {
+            throw new InvalidArgumentException('The filename is not valid.');
+        }
+
+        $protocol = isset($parsedFilename['scheme']) ? \mb_strtolower($parsedFilename['scheme']) : 'file';
+
+        if (
+            \PHP_OS_FAMILY === 'Windows'
+            && \strlen($protocol) === 1
+            && \preg_match(self::WINDOWS_LOCAL_FILENAME_REGEX, $filename)
+        ) {
+            $protocol = 'file';
+        }
+
+        return \in_array($protocol, self::ALLOWED_PROTOCOLS, true);
+    }
+
     /**
      * Wrapper for the "file_get_contents" function.
      *