From e7b58ed2bdfe4bb56866e76b8fdd618946fa3c51 Mon Sep 17 00:00:00 2001
From: Robin Appelman <icewind@owncloud.com>
Date: Thu, 12 Jun 2014 17:53:56 +0200
Subject: [PATCH] Properly expose read only public shares as read only

---
 apps/files_sharing/ajax/shareinfo.php       |  7 +++
 apps/files_sharing/lib/external/scanner.php |  4 ++
 apps/files_sharing/lib/readonlycache.php    | 27 ++++++++++
 apps/files_sharing/lib/readonlywrapper.php  | 56 +++++++++++++++++++++
 apps/files_sharing/publicwebdav.php         |  8 +++
 5 files changed, 102 insertions(+)
 create mode 100644 apps/files_sharing/lib/readonlycache.php
 create mode 100644 apps/files_sharing/lib/readonlywrapper.php

diff --git a/apps/files_sharing/ajax/shareinfo.php b/apps/files_sharing/ajax/shareinfo.php
index 4aefdbe7b15..c5764867d56 100644
--- a/apps/files_sharing/ajax/shareinfo.php
+++ b/apps/files_sharing/ajax/shareinfo.php
@@ -33,6 +33,13 @@ $linkItem = $data['linkItem'];
 // Load the files
 $path = $data['realPath'];
 
+$isWritable = $linkItem['permissions'] & \OCP\PERMISSION_CREATE;
+if (!$isWritable) {
+	\OC\Files\Filesystem::addStorageWrapper('readonly', function ($mountPoint, $storage) {
+		return new \OCA\Files_Sharing\ReadOnlyWrapper(array('storage' => $storage));
+	});
+}
+
 $rootInfo = \OC\Files\Filesystem::getFileInfo($path);
 $rootView = new \OC\Files\View('');
 
diff --git a/apps/files_sharing/lib/external/scanner.php b/apps/files_sharing/lib/external/scanner.php
index 1f32d79b149..8fb8683ed92 100644
--- a/apps/files_sharing/lib/external/scanner.php
+++ b/apps/files_sharing/lib/external/scanner.php
@@ -14,6 +14,10 @@ class Scanner extends \OC\Files\Cache\Scanner {
 	 */
 	protected $storage;
 
+	public function scan($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1) {
+		$this->scanAll();
+	}
+
 	public function scanAll() {
 		$remote = $this->storage->getRemote();
 		$token = $this->storage->getToken();
diff --git a/apps/files_sharing/lib/readonlycache.php b/apps/files_sharing/lib/readonlycache.php
new file mode 100644
index 00000000000..f129ca49433
--- /dev/null
+++ b/apps/files_sharing/lib/readonlycache.php
@@ -0,0 +1,27 @@
+<?php
+/**
+ * Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OCA\Files_Sharing;
+
+use OC\Files\Cache\Cache;
+
+class ReadOnlyCache extends Cache {
+	public function get($path) {
+		$data = parent::get($path);
+		$data['permissions'] &= (\OCP\PERMISSION_READ | \OCP\PERMISSION_SHARE);
+		return $data;
+	}
+
+	public function getFolderContents($path) {
+		$content = parent::getFolderContents($path);
+		foreach ($content as &$data) {
+			$data['permissions'] &= (\OCP\PERMISSION_READ | \OCP\PERMISSION_SHARE);
+		}
+		return $content;
+	}
+}
diff --git a/apps/files_sharing/lib/readonlywrapper.php b/apps/files_sharing/lib/readonlywrapper.php
new file mode 100644
index 00000000000..45ed3fd68bb
--- /dev/null
+++ b/apps/files_sharing/lib/readonlywrapper.php
@@ -0,0 +1,56 @@
+<?php
+/**
+ * Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OCA\Files_Sharing;
+
+use OC\Files\Storage\Wrapper\Wrapper;
+
+class ReadOnlyWrapper extends Wrapper {
+	public function isUpdatable($path) {
+		return false;
+	}
+
+	public function isCreatable($path) {
+		return false;
+	}
+
+	public function isDeletable($path) {
+		return false;
+	}
+
+	public function getPermissions($path) {
+		return $this->storage->getPermissions($path) & (\OCP\PERMISSION_READ | \OCP\PERMISSION_SHARE);
+	}
+
+	public function rename($path1, $path2) {
+		return false;
+	}
+
+	public function touch($path, $mtime = null) {
+		return false;
+	}
+
+	public function mkdir($path) {
+		return false;
+	}
+
+	public function rmdir($path) {
+		return false;
+	}
+
+	public function unlink($path) {
+		return false;
+	}
+
+	public function getCache($path = '', $storage = null) {
+		if (!$storage) {
+			$storage = $this;
+		}
+		return new ReadOnlyCache($storage);
+	}
+}
diff --git a/apps/files_sharing/publicwebdav.php b/apps/files_sharing/publicwebdav.php
index b4f56eed89c..f33b920bc54 100644
--- a/apps/files_sharing/publicwebdav.php
+++ b/apps/files_sharing/publicwebdav.php
@@ -37,7 +37,15 @@ $server->addPlugin(new OC_Connector_Sabre_ExceptionLoggerPlugin('webdav'));
 $server->subscribeEvent('beforeMethod', function () use ($server, $objectTree, $authBackend) {
 	$share = $authBackend->getShare();
 	$owner = $share['uid_owner'];
+	$isWritable = $share['permissions'];
 	$fileId = $share['file_source'];
+
+	if (!$isWritable) {
+		\OC\Files\Filesystem::addStorageWrapper('readonly', function ($mountPoint, $storage) {
+			return new \OCA\Files_Sharing\ReadOnlyWrapper(array('storage' => $storage));
+		});
+	}
+
 	OC_Util::setupFS($owner);
 	$ownerView = \OC\Files\Filesystem::getView();
 	$path = $ownerView->getPath($fileId);
-- 
2.39.5