Return hashes of uploaded content for dav uploads

hashes are set in "X-Hash-MD5", "X-Hash-SHA1" and "X-Hash-SHA256" headers.

these headers are set for file uploads and the MOVE request at the end of a multipart upload.

Signed-off-by: Robin Appelman <robin@icewind.nl>

apps/dav/lib/Connector/Sabre/File.php

@@ -41,6 +41,7 @@ namespace OCA\DAV\Connector\Sabre;
 use Icewind\Streams\CallbackWrapper;
 use OC\AppFramework\Http\Request;
 use OC\Files\Filesystem;
+use OC\Files\Stream\HashWrapper;
 use OC\Files\View;
 use OCA\DAV\Connector\Sabre\Exception\EntityTooLarge;
 use OCA\DAV\Connector\Sabre\Exception\FileLocked;
@@ -173,7 +174,6 @@ class File extends Node implements IFile {
 				$this->changeLock(ILockingProvider::LOCK_EXCLUSIVE);
 			}
 
-			if ($partStorage->instanceOfStorage(Storage\IWriteStreamStorage::class)) {
 			if (!is_resource($data)) {
 				$tmpData = fopen('php://temp', 'r+');
 				if ($data !== null) {
@@ -183,6 +183,17 @@ class File extends Node implements IFile {
 				$data = $tmpData;
 			}
 
+			$data = HashWrapper::wrap($data, 'md5', function ($hash) {
+				$this->header('X-Hash-MD5: ' . $hash);
+			});
+			$data = HashWrapper::wrap($data, 'sha1', function ($hash) {
+				$this->header('X-Hash-SHA1: ' . $hash);
+			});
+			$data = HashWrapper::wrap($data, 'sha256', function ($hash) {
+				$this->header('X-Hash-SHA256: ' . $hash);
+			});
+
+			if ($partStorage->instanceOfStorage(Storage\IWriteStreamStorage::class)) {
 				$isEOF = false;
 				$wrappedData = CallbackWrapper::wrap($data, null, null, null, null, function ($stream) use (&$isEOF) {
 					$isEOF = feof($stream);

lib/composer/composer/autoload_classmap.php

@@ -1024,6 +1024,7 @@ return array(
     'OC\\Files\\Storage\\Wrapper\\Quota' => $baseDir . '/lib/private/Files/Storage/Wrapper/Quota.php',
     'OC\\Files\\Storage\\Wrapper\\Wrapper' => $baseDir . '/lib/private/Files/Storage/Wrapper/Wrapper.php',
     'OC\\Files\\Stream\\Encryption' => $baseDir . '/lib/private/Files/Stream/Encryption.php',
+    'OC\\Files\\Stream\\HashWrapper' => $baseDir . '/lib/private/Files/Stream/HashWrapper.php',
     'OC\\Files\\Stream\\Quota' => $baseDir . '/lib/private/Files/Stream/Quota.php',
     'OC\\Files\\Stream\\SeekableHttpStream' => $baseDir . '/lib/private/Files/Stream/SeekableHttpStream.php',
     'OC\\Files\\Type\\Detection' => $baseDir . '/lib/private/Files/Type/Detection.php',

lib/composer/composer/autoload_static.php

@@ -1053,6 +1053,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\Files\\Storage\\Wrapper\\Quota' => __DIR__ . '/../../..' . '/lib/private/Files/Storage/Wrapper/Quota.php',
         'OC\\Files\\Storage\\Wrapper\\Wrapper' => __DIR__ . '/../../..' . '/lib/private/Files/Storage/Wrapper/Wrapper.php',
         'OC\\Files\\Stream\\Encryption' => __DIR__ . '/../../..' . '/lib/private/Files/Stream/Encryption.php',
+        'OC\\Files\\Stream\\HashWrapper' => __DIR__ . '/../../..' . '/lib/private/Files/Stream/HashWrapper.php',
         'OC\\Files\\Stream\\Quota' => __DIR__ . '/../../..' . '/lib/private/Files/Stream/Quota.php',
         'OC\\Files\\Stream\\SeekableHttpStream' => __DIR__ . '/../../..' . '/lib/private/Files/Stream/SeekableHttpStream.php',
         'OC\\Files\\Type\\Detection' => __DIR__ . '/../../..' . '/lib/private/Files/Type/Detection.php',

lib/private/Files/Stream/HashWrapper.php

@@ -0,0 +1,72 @@
+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2020 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Files\Stream;
+
+use Icewind\Streams\Wrapper;
+
+class HashWrapper extends Wrapper {
+	protected $callback;
+	protected $hash;
+
+	public static function wrap($source, string $algo, callable $callback) {
+		$hash = hash_init($algo);
+		$context = stream_context_create([
+			'hash' => [
+				'source' => $source,
+				'callback' => $callback,
+				'hash' => $hash,
+			],
+		]);
+		return Wrapper::wrapSource($source, $context, 'hash', self::class);
+	}
+
+	protected function open() {
+		$context = $this->loadContext('hash');
+
+		$this->callback = $context['callback'];
+		$this->hash = $context['hash'];
+		return true;
+	}
+
+	public function dir_opendir($path, $options) {
+		return $this->open();
+	}
+
+	public function stream_open($path, $mode, $options, &$opened_path) {
+		return $this->open();
+	}
+
+	public function stream_read($count) {
+		$result = parent::stream_read($count);
+		hash_update($this->hash, $result);
+		return $result;
+	}
+
+	public function stream_close() {
+		if (is_callable($this->callback)) {
+			call_user_func($this->callback, hash_final($this->hash));
+			// prevent further calls by potential PHP 7 GC ghosts
+			$this->callback = null;
+		}
+		return parent::stream_close();
+	}
+}

tests/lib/Files/Stream/HashWrapperTest.php

@@ -0,0 +1,55 @@
+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2020 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Test\Files\Stream;
+
+use OC\Files\Stream\HashWrapper;
+use Test\TestCase;
+
+class HashWrapperTest extends TestCase {
+	/**
+	 * @dataProvider hashProvider
+	 */
+	public function testHashStream($data, string $algo, string $hash) {
+		if (!is_resource($data)) {
+			$tmpData = fopen('php://temp', 'r+');
+			if ($data !== null) {
+				fwrite($tmpData, $data);
+				rewind($tmpData);
+			}
+			$data = $tmpData;
+		}
+
+		$wrapper = HashWrapper::wrap($data, $algo, function ($result) use ($hash) {
+			$this->assertEquals($hash, $result);
+		});
+		stream_get_contents($wrapper);
+	}
+
+	public function hashProvider() {
+		return [
+			['foo', 'md5', 'acbd18db4cc2f85cedef654fccc4a4d8'],
+			['foo', 'sha1', '0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33'],
+			['foo', 'sha256', '2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae'],
+			[str_repeat('foo', 8192), 'md5', '96684d2b796a2c54a026b5d60f9de819'],
+		];
+	}
+}