Prevent passing invalid resources.

Author: frankdejonge

src/Filesystem.php

@@ -74,7 +74,7 @@ public function write($path, $contents, array $config = [])
      */
     public function writeStream($path, $resource, array $config = [])
     {
-        if ( ! is_resource($resource)) {
+        if ( ! is_resource($resource) || get_resource_type($resource) !== 'stream') {
             throw new InvalidArgumentException(__METHOD__ . ' expects argument #2 to be a valid resource.');
         }
 
@@ -107,7 +107,7 @@ public function put($path, $contents, array $config = [])
      */
     public function putStream($path, $resource, array $config = [])
     {
-        if ( ! is_resource($resource)) {
+        if ( ! is_resource($resource) || get_resource_type($resource) !== 'stream') {
             throw new InvalidArgumentException(__METHOD__ . ' expects argument #2 to be a valid resource.');
         }
 
@@ -158,7 +158,7 @@ public function update($path, $contents, array $config = [])
      */
     public function updateStream($path, $resource, array $config = [])
     {
-        if ( ! is_resource($resource)) {
+        if ( ! is_resource($resource) || get_resource_type($resource) !== 'stream') {
             throw new InvalidArgumentException(__METHOD__ . ' expects argument #2 to be a valid resource.');
         }
 

tests/FilesystemTests.php

@@ -156,6 +156,26 @@ public function testPutStreamInvalid()
         $this->filesystem->putStream('path.txt', '__INVALID__');
     }
 
+    /**
+     * @dataProvider methodsThatGuardAgainstClosedResources
+     */
+    public function testSupplyingClosedStreams($method)
+    {
+        $handle = tmpfile();
+        fclose($handle);
+        $this->expectException('InvalidArgumentException');
+        $this->filesystem->{$method}('path.txt', $handle);
+    }
+
+    public function methodsThatGuardAgainstClosedResources()
+    {
+        return [
+            ['putStream'],
+            ['writeStream'],
+            ['updateStream'],
+        ];
+    }
+
     public function testWriteStreamInvalid()
     {
         $this->expectException('InvalidArgumentException');