add PathWrapper to get a virtual path for an existing file

src/Path.php

@@ -56,7 +56,7 @@ public function wrapPath($path) {
 
 	protected function register() {
 		if (!$this->registered) {
-			$this->appendDefaultContent($this->getProtocol(), $this->contextOptions);
+			$this->appendDefaultContent($this->contextOptions);
 			stream_wrapper_register($this->getProtocol(), $this->class);
 			$this->registered = true;
 		}
@@ -71,13 +71,14 @@ protected function unregister() {
 	/**
 	 * Add values to the default stream context
 	 *
-	 * @param string $key
 	 * @param array $values
 	 */
-	protected function appendDefaultContent($key, $values) {
+	protected function appendDefaultContent($values) {
 		$context = stream_context_get_default();
 		$defaults = stream_context_get_options($context);
-		$defaults[$key] = $values;
+		foreach ($values as $key => $value) {
+			$defaults[$key] = $value;
+		}
 		stream_context_set_default($defaults);
 	}
 

src/PathWrapper.php

@@ -0,0 +1,25 @@
+<?php
+/**
+ * Copyright (c) 2016 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Licensed under the MIT license:
+ * http://opensource.org/licenses/MIT
+ */
+
+namespace Icewind\Streams;
+
+/**
+ * A string-like object that maps to an existing stream when opened
+ */
+class PathWrapper extends NullWrapper {
+	/**
+	 * @param resource $source
+	 * @return Path|string
+	 */
+	public static function getPath($source) {
+		return new Path(__CLASS__, [
+			'null' => [
+				'source' => $source
+			]
+		]);
+	}
+}

src/Wrapper.php

@@ -53,7 +53,7 @@ protected function loadContext($name) {
 		if (isset($context[$name])) {
 			$context = $context[$name];
 		} else {
-			throw new \BadMethodCallException('Invalid context, "callable" options not set');
+			throw new \BadMethodCallException('Invalid context, "' . $name . '" options not set');
 		}
 		if (isset($context['source']) and is_resource($context['source'])) {
 			$this->setSourceStream($context['source']);

tests/PathWrapper.php

@@ -0,0 +1,24 @@
+<?php
+/**
+ * Copyright (c) 2016 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Licensed under the MIT license:
+ * http://opensource.org/licenses/MIT
+ */
+
+namespace Icewind\Streams\Tests;
+
+class PathWrapper extends \PHPUnit_Framework_TestCase {
+	private function getDataStream($data) {
+		$stream = fopen('php://temp', 'w+');
+		fwrite($stream, $data);
+		rewind($stream);
+		return $stream;
+	}
+
+	public function testFileGetContents() {
+		$data = 'foobar';
+		$stream = $this->getDataStream($data);
+		$path = \Icewind\Streams\PathWrapper::getPath($stream);
+		$this->assertEquals($data, file_get_contents($path));
+	}
+}