add quota storage wrapper

lib/files/storage/wrapper/quota.php

@@ -0,0 +1,104 @@
+<?php
+/**
+ * Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OC\Files\Storage\Wrapper;
+
+class Quota extends Wrapper {
+
+	/**
+	 * @var int $quota
+	 */
+	protected $quota;
+
+	/**
+	 * @param array $parameters
+	 */
+	public function __construct($parameters) {
+		$this->storage = $parameters['storage'];
+		$this->quota = $parameters['quota'];
+	}
+
+	protected function getSize($path) {
+		$cache = $this->getCache();
+		$data = $cache->get($path);
+		if (is_array($data) and isset($data['size'])) {
+			return $data['size'];
+		} else {
+			return \OC\Files\SPACE_NOT_COMPUTED;
+		}
+	}
+
+	/**
+	 * Get free space as limited by the quota
+	 *
+	 * @param string $path
+	 * @return int
+	 */
+	public function free_space($path) {
+		if ($this->quota < 0) {
+			return $this->storage->free_space($path);
+		} else {
+			$used = $this->getSize('');
+			if ($used < 0) {
+				return \OC\Files\SPACE_NOT_COMPUTED;
+			} else {
+				$free = $this->storage->free_space($path);
+				return min($free, ($this->quota - $used));
+			}
+		}
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.file_put_contents.php
+	 *
+	 * @param string $path
+	 * @param string $data
+	 * @return bool
+	 */
+	public function file_put_contents($path, $data) {
+		$free = $this->free_space('');
+		if ($free < 0 or strlen($data) < $free) {
+			return $this->storage->file_put_contents($path, $data);
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.copy.php
+	 *
+	 * @param string $source
+	 * @param string $target
+	 * @return bool
+	 */
+	public function copy($source, $target) {
+		$free = $this->free_space('');
+		if ($free < 0 or $this->getSize($source) < $free) {
+			return $this->storage->copy($source, $target);
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * see http://php.net/manual/en/function.fopen.php
+	 *
+	 * @param string $path
+	 * @param string $mode
+	 * @return resource
+	 */
+	public function fopen($path, $mode) {
+		$source = $this->storage->fopen($path, $mode);
+		$free = $this->free_space('');
+		if ($free >= 0) {
+			return \OC\Files\Stream\Quota::wrap($source, $free);
+		} else {
+			return $source;
+		}
+	}
+}

tests/lib/files/storage/wrapper/quota.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace Test\Files\Storage\Wrapper;
+
+//ensure the constants are loaded
+\OC::$loader->load('\OC\Files\Filesystem');
+
+class Quota extends \Test\Files\Storage\Storage {
+	/**
+	 * @var string tmpDir
+	 */
+	private $tmpDir;
+
+	public function setUp() {
+		$this->tmpDir = \OC_Helper::tmpFolder();
+		$storage = new \OC\Files\Storage\Local(array('datadir' => $this->tmpDir));
+		$this->instance = new \OC\Files\Storage\Wrapper\Quota(array('storage' => $storage, 'quota' => 10000000));
+	}
+
+	public function tearDown() {
+		\OC_Helper::rmdirr($this->tmpDir);
+	}
+
+	protected function getLimitedStorage($limit) {
+		$storage = new \OC\Files\Storage\Local(array('datadir' => $this->tmpDir));
+		$storage->getScanner()->scan('');
+		return new \OC\Files\Storage\Wrapper\Quota(array('storage' => $storage, 'quota' => $limit));
+	}
+
+	public function testFilePutContentsNotEnoughSpace() {
+		$instance = $this->getLimitedStorage(3);
+		$this->assertFalse($instance->file_put_contents('foo', 'foobar'));
+	}
+
+	public function testCopyNotEnoughSpace() {
+		$instance = $this->getLimitedStorage(9);
+		$this->assertEquals(6, $instance->file_put_contents('foo', 'foobar'));
+		$instance->getScanner()->scan('');
+		$this->assertFalse($instance->copy('foo', 'bar'));
+	}
+
+	public function testFreeSpace() {
+		$instance = $this->getLimitedStorage(9);
+		$this->assertEquals(9, $instance->free_space(''));
+	}
+
+	public function testFWriteNotEnoughSpace() {
+		$instance = $this->getLimitedStorage(9);
+		$stream = $instance->fopen('foo', 'w+');
+		$this->assertEquals(6, fwrite($stream, 'foobar'));
+		$this->assertEquals(3, fwrite($stream, 'qwerty'));
+		fclose($stream);
+		$this->assertEquals('foobarqwe', $instance->file_get_contents('foo'));
+	}
+}