first commit

vendor/vlucas/phpdotenv/src/Repository/Adapter/GuardedWriter.php

@@ -0,0 +1,85 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Dotenv\Repository\Adapter;
+
+final class GuardedWriter implements WriterInterface
+{
+    /**
+     * The inner writer to use.
+     *
+     * @var \Dotenv\Repository\Adapter\WriterInterface
+     */
+    private $writer;
+
+    /**
+     * The variable name allow list.
+     *
+     * @var string[]
+     */
+    private $allowList;
+
+    /**
+     * Create a new guarded writer instance.
+     *
+     * @param \Dotenv\Repository\Adapter\WriterInterface $writer
+     * @param string[]                                   $allowList
+     *
+     * @return void
+     */
+    public function __construct(WriterInterface $writer, array $allowList)
+    {
+        $this->writer = $writer;
+        $this->allowList = $allowList;
+    }
+
+    /**
+     * Write to an environment variable, if possible.
+     *
+     * @param non-empty-string $name
+     * @param string           $value
+     *
+     * @return bool
+     */
+    public function write(string $name, string $value)
+    {
+        // Don't set non-allowed variables
+        if (!$this->isAllowed($name)) {
+            return false;
+        }
+
+        // Set the value on the inner writer
+        return $this->writer->write($name, $value);
+    }
+
+    /**
+     * Delete an environment variable, if possible.
+     *
+     * @param non-empty-string $name
+     *
+     * @return bool
+     */
+    public function delete(string $name)
+    {
+        // Don't clear non-allowed variables
+        if (!$this->isAllowed($name)) {
+            return false;
+        }
+
+        // Set the value on the inner writer
+        return $this->writer->delete($name);
+    }
+
+    /**
+     * Determine if the given variable is allowed.
+     *
+     * @param non-empty-string $name
+     *
+     * @return bool
+     */
+    private function isAllowed(string $name)
+    {
+        return \in_array($name, $this->allowList, true);
+    }
+}