Add sharePermissions webdav property

This property can be queries by the clients so they know the max
permissions they can use to share a file with. This will improve the UX.

The oc:permissions proptery is not enough since mountpoints have
different permissions (delete + move by default).

By making it a new property the clients can just request it. On older
servers it will just return a 404 for that property (and thus they know
they have to fall back to their hacky work arounds). But if the property
is returned the client can show proper info.

* unit tests
* intergration test

3 files changed, 100 insertions, 0 deletions

diff --git a/apps/dav/lib/connector/sabre/filesplugin.php b/apps/dav/lib/connector/sabre/filesplugin.php
index fb2af554c68..8b54291793a 100644
--- a/apps/dav/lib/connector/sabre/filesplugin.php
+++ b/apps/dav/lib/connector/sabre/filesplugin.php
@@ -45,6 +45,7 @@ class FilesPlugin extends \Sabre\DAV\ServerPlugin {
 	const FILEID_PROPERTYNAME = '{http://owncloud.org/ns}id';
 	const INTERNAL_FILEID_PROPERTYNAME = '{http://owncloud.org/ns}fileid';
 	const PERMISSIONS_PROPERTYNAME = '{http://owncloud.org/ns}permissions';
+	const SHARE_PERMISSIONS_PROPERTYNAME = '{http://owncloud.org/ns}share-permissions';
 	const DOWNLOADURL_PROPERTYNAME = '{http://owncloud.org/ns}downloadURL';
 	const SIZE_PROPERTYNAME = '{http://owncloud.org/ns}size';
 	const GETETAG_PROPERTYNAME = '{DAV:}getetag';
@@ -116,6 +117,7 @@ class FilesPlugin extends \Sabre\DAV\ServerPlugin {
 		$server->protectedProperties[] = self::FILEID_PROPERTYNAME;
 		$server->protectedProperties[] = self::INTERNAL_FILEID_PROPERTYNAME;
 		$server->protectedProperties[] = self::PERMISSIONS_PROPERTYNAME;
+		$server->protectedProperties[] = self::SHARE_PERMISSIONS_PROPERTYNAME;
 		$server->protectedProperties[] = self::SIZE_PROPERTYNAME;
 		$server->protectedProperties[] = self::DOWNLOADURL_PROPERTYNAME;
 		$server->protectedProperties[] = self::OWNER_ID_PROPERTYNAME;
@@ -245,6 +247,10 @@ class FilesPlugin extends \Sabre\DAV\ServerPlugin {
 				return $perms;
 			});
 
+			$propFind->handle(self::SHARE_PERMISSIONS_PROPERTYNAME, function() use ($node) {
+				return $node->getSharePermissions();
+			});
+
 			$propFind->handle(self::GETETAG_PROPERTYNAME, function() use ($node) {
 				return $node->getETag();
 			});
diff --git a/apps/dav/lib/connector/sabre/node.php b/apps/dav/lib/connector/sabre/node.php
index 95a5f0a8749..86e1844687a 100644
--- a/apps/dav/lib/connector/sabre/node.php
+++ b/apps/dav/lib/connector/sabre/node.php
@@ -214,6 +214,39 @@ abstract class Node implements \Sabre\DAV\INode {
 	}
 
 	/**
+	 * @return int
+	 */
+	public function getSharePermissions() {
+		$storage = $this->info->getStorage();
+
+		$path = $this->info->getInternalPath();
+
+		if ($storage->instanceOfStorage('\OC\Files\Storage\Shared')) {
+			/** @var \OC\Files\Storage\Shared $storage */
+			$permissions = (int)$storage->getShare()['permissions'];
+		} else {
+			$permissions = $storage->getPermissions($path);
+		}
+
+		/*
+		 * Without sharing permissions there are also no other permissions
+		 */
+		if (!($permissions & \OCP\Constants::PERMISSION_SHARE) ||
+			!($permissions & \OCP\Constants::PERMISSION_READ)) {
+			return 0;
+		}
+
+		/*
+		 * Files can't have create or delete permissions
+		 */
+		if ($this->info->getType() === \OCP\Files\FileInfo::TYPE_FILE) {
+			$permissions &= ~(\OCP\Constants::PERMISSION_CREATE | \OCP\Constants::PERMISSION_DELETE);
+		}
+
+		return $permissions;
+	}
+
+	/**
 	 * @return string
 	 */
 	public function getDavPermissions() {
diff --git a/apps/dav/tests/unit/connector/sabre/node.php b/apps/dav/tests/unit/connector/sabre/node.php
index 8c92c2f063c..c9fe6e60273 100644
--- a/apps/dav/tests/unit/connector/sabre/node.php
+++ b/apps/dav/tests/unit/connector/sabre/node.php
@@ -63,4 +63,65 @@ class Node extends \Test\TestCase {
 		$node = new  \OCA\DAV\Connector\Sabre\File($view, $info);
 		$this->assertEquals($expected, $node->getDavPermissions());
 	}
+
+	public function sharePermissionsProvider() {
+		return [
+			[\OCP\Files\FileInfo::TYPE_FILE, 1, 0],
+			[\OCP\Files\FileInfo::TYPE_FILE, 3, 0],
+			[\OCP\Files\FileInfo::TYPE_FILE, 5, 0],
+			[\OCP\Files\FileInfo::TYPE_FILE, 7, 0],
+			[\OCP\Files\FileInfo::TYPE_FILE, 9, 0],
+			[\OCP\Files\FileInfo::TYPE_FILE, 11, 0],
+			[\OCP\Files\FileInfo::TYPE_FILE, 13, 0],
+			[\OCP\Files\FileInfo::TYPE_FILE, 15, 0],
+			[\OCP\Files\FileInfo::TYPE_FILE, 17, 17],
+			[\OCP\Files\FileInfo::TYPE_FILE, 19, 19],
+			[\OCP\Files\FileInfo::TYPE_FILE, 21, 17],
+			[\OCP\Files\FileInfo::TYPE_FILE, 23, 19],
+			[\OCP\Files\FileInfo::TYPE_FILE, 25, 17],
+			[\OCP\Files\FileInfo::TYPE_FILE, 27, 19],
+			[\OCP\Files\FileInfo::TYPE_FILE, 29, 17],
+			[\OCP\Files\FileInfo::TYPE_FILE, 30, 0],
+			[\OCP\Files\FileInfo::TYPE_FILE, 31, 19],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 1, 0],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 3, 0],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 5, 0],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 7, 0],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 9, 0],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 11, 0],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 13, 0],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 15, 0],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 17, 17],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 19, 19],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 21, 21],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 23, 23],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 25, 25],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 27, 27],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 29, 29],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 30, 0],
+			[\OCP\Files\FileInfo::TYPE_FOLDER, 31, 31],
+		];
+	}
+
+	/**
+	 * @dataProvider sharePermissionsProvider
+	 */
+	public function testSharePermissions($type, $permissions, $expected) {
+		$storage = $this->getMock('\OCP\Files\Storage');
+
+		$storage->method('getPermissions')->willReturn($permissions);
+
+		$info = $this->getMockBuilder('\OC\Files\FileInfo')
+			->disableOriginalConstructor()
+			->setMethods(array('getStorage', 'getType'))
+			->getMock();
+
+		$info->method('getStorage')->willReturn($storage);
+		$info->method('getType')->willReturn($type);
+
+		$view = $this->getMock('\OC\Files\View');
+
+		$node = new  \OCA\DAV\Connector\Sabre\File($view, $info);
+		$this->assertEquals($expected, $node->getSharePermissions());
+	}
 }