[Share 2.0] Add deleteFromSelf method

This allows recipient to delete a share. For user shares this is the
same as deleting (at least for now).
But for group shares this means creating a new share with type 2. With
permissions set to 0.

lib/private/share20/defaultshareprovider.php

@@ -21,6 +21,7 @@
 namespace OC\Share20;
 
 use OC\Share20\Exception\InvalidShare;
+use OC\Share20\Exception\ProviderException;
 use OC\Share20\Exception\ShareNotFound;
 use OC\Share20\Exception\BackendError;
 use OCP\Files\NotFoundException;
@@ -241,6 +242,84 @@ class DefaultShareProvider implements IShareProvider {
 		}
 	}
 
+	/**
+	 * Unshare a share from the recipient. If this is a group share
+	 * this means we need a special entry in the share db.
+	 *
+	 * @param IShare $share
+	 * @param IUser $recipient
+	 * @throws BackendError
+	 * @throws ProviderException
+	 */
+	public function deleteFromSelf(IShare $share, IUser $recipient) {
+		if ($share->getShareType() === \OCP\Share::SHARE_TYPE_GROUP) {
+
+			/** @var IGroup $group */
+			$group = $share->getSharedWith();
+
+			if (!$group->inGroup($recipient)) {
+				throw new ProviderException('Recipient not in receiving group');
+			}
+
+			// Try to fetch user specific share
+			$qb = $this->dbConn->getQueryBuilder();
+			$stmt = $qb->select('*')
+				->from('share')
+				->where($qb->expr()->eq('share_type', $qb->createNamedParameter(self::SHARE_TYPE_USERGROUP)))
+				->andWhere($qb->expr()->eq('share_with', $qb->createNamedParameter($recipient->getUID())))
+				->andWhere($qb->expr()->eq('parent', $qb->createNamedParameter($share->getId())))
+				->execute();
+
+			$data = $stmt->fetch();
+
+			/*
+			 * Check if there already is a user specific group share.
+			 * If there is update it (if required).
+			 */
+			if ($data === false) {
+				$qb = $this->dbConn->getQueryBuilder();
+
+				$type = $share->getPath() instanceof \OCP\Files\File ? 'file' : 'folder';
+
+				//Insert new share
+				$qb->insert('share')
+					->values([
+						'share_type' => $qb->createNamedParameter(self::SHARE_TYPE_USERGROUP),
+						'share_with' => $qb->createNamedParameter($recipient->getUID()),
+						'uid_owner' => $qb->createNamedParameter($share->getShareOwner()->getUID()),
+						'uid_initiator' => $qb->createNamedParameter($share->getSharedBy()->getUID()),
+						'parent' => $qb->createNamedParameter($share->getId()),
+						'item_type' => $qb->createNamedParameter($type),
+						'item_source' => $qb->createNamedParameter($share->getPath()->getId()),
+						'file_source' => $qb->createNamedParameter($share->getPath()->getId()),
+						'file_target' => $qb->createNamedParameter($share->getTarget()),
+						'permissions' => $qb->createNamedParameter(0),
+						'stime' => $qb->createNamedParameter($share->getSharetime()),
+					])->execute();
+
+			} else if ($data['permissions'] !== 0) {
+
+				// Update existing usergroup share
+				$qb = $this->dbConn->getQueryBuilder();
+				$qb->update('share')
+					->set('permissions', $qb->createNamedParameter(0))
+					->where($qb->expr()->eq('id', $qb->createNamedParameter($data['id'])))
+					->execute();
+			}
+
+		} else if ($share->getShareType() === \OCP\Share::SHARE_TYPE_USER) {
+
+			if ($share->getSharedWith() !== $recipient) {
+				throw new ProviderException('Recipient does not match');
+			}
+
+			// We can just delete user and link shares
+			$this->delete($share);
+		} else {
+			throw new ProviderException('Invalid shareType');
+		}
+	}
+
 	/**
 	 * Get all shares by the given user. Sharetype and path can be used to filter.
 	 *

lib/private/share20/ishareprovider.php

@@ -57,6 +57,15 @@ interface IShareProvider {
 	 */
 	public function delete(IShare $share);
 
+	/**
+	 * Unshare a file from self as recipient.
+	 * This may require special handling.
+	 *
+	 * @param IShare $share
+	 * @param IUser $recipient
+	 */
+	public function deleteFromSelf(IShare $share, IUser $recipient);
+
 	/**
 	 * Get all shares by the given user
 	 *

lib/private/share20/manager.php

@@ -606,6 +606,22 @@ class Manager {
 	}
 
 
+	/**
+	 * Unshare a file as the recipient.
+	 * This can be different from a regular delete for example when one of
+	 * the users in a groups deletes that share. But the provider should
+	 * handle this.
+	 *
+	 * @param IShare $share
+	 * @param IUser $recipient
+	 */
+	public function deleteFromSelf(IShare $share, IUser $recipient) {
+		list($providerId, $id) = $this->splitFullId($share->getId());
+		$provider = $this->factory->getProvider($providerId);
+
+		$provider->deleteFromSelf($share, $recipient);
+	}
+
 	/**
 	 * Get shares shared by (initiated) by the provided user.
 	 *

tests/lib/share20/defaultshareprovidertest.php

@@ -20,6 +20,7 @@
  */
 namespace Test\Share20;
 
+use OC\Share20\Exception\ProviderException;
 use OCP\IDBConnection;
 use OCP\IUserManager;
 use OCP\IGroupManager;
@@ -1061,7 +1062,7 @@ class DefaultShareProviderTest extends \Test\TestCase {
 				'share_with' => $qb->expr()->literal('sharedWith'),
 				'uid_owner' => $qb->expr()->literal('shareOwner'),
 				'uid_initiator' => $qb->expr()->literal('shareOwner'),
-				'item_type'   => $qb->expr()->literal('file'),
+				'item_type' => $qb->expr()->literal('file'),
 				'file_source' => $qb->expr()->literal(42),
 				'file_target' => $qb->expr()->literal('myTarget'),
 				'permissions' => $qb->expr()->literal(13),
@@ -1076,7 +1077,7 @@ class DefaultShareProviderTest extends \Test\TestCase {
 				'share_with' => $qb->expr()->literal('sharedWith'),
 				'uid_owner' => $qb->expr()->literal('shareOwner'),
 				'uid_initiator' => $qb->expr()->literal('sharedBy'),
-				'item_type'   => $qb->expr()->literal('file'),
+				'item_type' => $qb->expr()->literal('file'),
 				'file_source' => $qb->expr()->literal(42),
 				'file_target' => $qb->expr()->literal('userTarget'),
 				'permissions' => $qb->expr()->literal(0),
@@ -1123,4 +1124,301 @@ class DefaultShareProviderTest extends \Test\TestCase {
 		$this->assertEquals(0, $share->getPermissions());
 		$this->assertEquals('userTarget', $share->getTarget());
 	}
+
+	public function testDeleteFromSelfGroupNoCustomShare() {
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->insert('share')
+			->values([
+				'share_type'    => $qb->expr()->literal(\OCP\Share::SHARE_TYPE_GROUP),
+				'share_with'    => $qb->expr()->literal('group'),
+				'uid_owner'     => $qb->expr()->literal('user1'),
+				'uid_initiator' => $qb->expr()->literal('user1'),
+				'item_type'     => $qb->expr()->literal('file'),
+				'file_source'   => $qb->expr()->literal(1),
+				'file_target'   => $qb->expr()->literal('myTarget1'),
+				'permissions'   => $qb->expr()->literal(2)
+			])->execute();
+		$this->assertEquals(1, $stmt);
+		$id = $qb->getLastInsertId();
+
+		$user1 = $this->getMock('\OCP\IUser');
+		$user1->method('getUID')->willReturn('user1');
+		$user2 = $this->getMock('\OCP\IUser');
+		$user2->method('getUID')->willReturn('user2');
+		$this->userManager->method('get')->will($this->returnValueMap([
+			['user1', $user1],
+			['user2', $user2],
+		]));
+
+		$group = $this->getMock('\OCP\IGroup');
+		$group->method('getGID')->willReturn('group');
+		$group->method('inGroup')->with($user2)->willReturn(true);
+		$this->groupManager->method('get')->with('group')->willReturn($group);
+
+		$file = $this->getMock('\OCP\Files\File');
+		$file->method('getId')->willReturn(1);
+
+		$this->rootFolder->method('getUserFolder')->with('user1')->will($this->returnSelf());
+		$this->rootFolder->method('getById')->with(1)->willReturn([$file]);
+
+		$share = $this->provider->getShareById($id);
+
+		$this->provider->deleteFromSelf($share, $user2);
+
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->select('*')
+			->from('share')
+			->where($qb->expr()->eq('share_type', $qb->createNamedParameter(2)))
+			->execute();
+
+		$shares = $stmt->fetchAll();
+		$stmt->closeCursor();
+
+		$this->assertCount(1, $shares);
+		$share2 = $shares[0];
+		$this->assertEquals($id, $share2['parent']);
+		$this->assertEquals(0, $share2['permissions']);
+		$this->assertEquals('user2', $share2['share_with']);
+	}
+
+	public function testDeleteFromSelfGroupAlreadyCustomShare() {
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->insert('share')
+			->values([
+				'share_type'    => $qb->expr()->literal(\OCP\Share::SHARE_TYPE_GROUP),
+				'share_with'    => $qb->expr()->literal('group'),
+				'uid_owner'     => $qb->expr()->literal('user1'),
+				'uid_initiator' => $qb->expr()->literal('user1'),
+				'item_type'     => $qb->expr()->literal('file'),
+				'file_source'   => $qb->expr()->literal(1),
+				'file_target'   => $qb->expr()->literal('myTarget1'),
+				'permissions'   => $qb->expr()->literal(2)
+			])->execute();
+		$this->assertEquals(1, $stmt);
+		$id = $qb->getLastInsertId();
+
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->insert('share')
+			->values([
+				'share_type'    => $qb->expr()->literal(2),
+				'share_with'    => $qb->expr()->literal('user2'),
+				'uid_owner'     => $qb->expr()->literal('user1'),
+				'uid_initiator' => $qb->expr()->literal('user1'),
+				'item_type'     => $qb->expr()->literal('file'),
+				'file_source'   => $qb->expr()->literal(1),
+				'file_target'   => $qb->expr()->literal('myTarget1'),
+				'permissions'   => $qb->expr()->literal(2),
+				'parent'        => $qb->expr()->literal($id),
+			])->execute();
+		$this->assertEquals(1, $stmt);
+
+		$user1 = $this->getMock('\OCP\IUser');
+		$user1->method('getUID')->willReturn('user1');
+		$user2 = $this->getMock('\OCP\IUser');
+		$user2->method('getUID')->willReturn('user2');
+		$this->userManager->method('get')->will($this->returnValueMap([
+			['user1', $user1],
+			['user2', $user2],
+		]));
+
+		$group = $this->getMock('\OCP\IGroup');
+		$group->method('getGID')->willReturn('group');
+		$group->method('inGroup')->with($user2)->willReturn(true);
+		$this->groupManager->method('get')->with('group')->willReturn($group);
+
+		$file = $this->getMock('\OCP\Files\File');
+		$file->method('getId')->willReturn(1);
+
+		$this->rootFolder->method('getUserFolder')->with('user1')->will($this->returnSelf());
+		$this->rootFolder->method('getById')->with(1)->willReturn([$file]);
+
+		$share = $this->provider->getShareById($id);
+
+		$this->provider->deleteFromSelf($share, $user2);
+
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->select('*')
+			->from('share')
+			->where($qb->expr()->eq('share_type', $qb->createNamedParameter(2)))
+			->execute();
+
+		$shares = $stmt->fetchAll();
+		$stmt->closeCursor();
+
+		$this->assertCount(1, $shares);
+		$share2 = $shares[0];
+		$this->assertEquals($id, $share2['parent']);
+		$this->assertEquals(0, $share2['permissions']);
+		$this->assertEquals('user2', $share2['share_with']);
+	}
+
+	/**
+	 * @expectedException \OC\Share20\Exception\ProviderException
+	 * @expectedExceptionMessage  Recipient not in receiving group
+	 */
+	public function testDeleteFromSelfGroupUserNotInGroup() {
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->insert('share')
+			->values([
+				'share_type'    => $qb->expr()->literal(\OCP\Share::SHARE_TYPE_GROUP),
+				'share_with'    => $qb->expr()->literal('group'),
+				'uid_owner'     => $qb->expr()->literal('user1'),
+				'uid_initiator' => $qb->expr()->literal('user1'),
+				'item_type'     => $qb->expr()->literal('file'),
+				'file_source'   => $qb->expr()->literal(1),
+				'file_target'   => $qb->expr()->literal('myTarget1'),
+				'permissions'   => $qb->expr()->literal(2)
+			])->execute();
+		$this->assertEquals(1, $stmt);
+		$id = $qb->getLastInsertId();
+
+		$user1 = $this->getMock('\OCP\IUser');
+		$user1->method('getUID')->willReturn('user1');
+		$user2 = $this->getMock('\OCP\IUser');
+		$user2->method('getUID')->willReturn('user2');
+		$this->userManager->method('get')->will($this->returnValueMap([
+			['user1', $user1],
+			['user2', $user2],
+		]));
+
+		$group = $this->getMock('\OCP\IGroup');
+		$group->method('getGID')->willReturn('group');
+		$group->method('inGroup')->with($user2)->willReturn(false);
+		$this->groupManager->method('get')->with('group')->willReturn($group);
+
+		$file = $this->getMock('\OCP\Files\File');
+		$file->method('getId')->willReturn(1);
+
+		$this->rootFolder->method('getUserFolder')->with('user1')->will($this->returnSelf());
+		$this->rootFolder->method('getById')->with(1)->willReturn([$file]);
+
+		$share = $this->provider->getShareById($id);
+
+		$this->provider->deleteFromSelf($share, $user2);
+	}
+
+	public function testDeleteFromSelfUser() {
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->insert('share')
+			->values([
+				'share_type'    => $qb->expr()->literal(\OCP\Share::SHARE_TYPE_USER),
+				'share_with'    => $qb->expr()->literal('user2'),
+				'uid_owner'     => $qb->expr()->literal('user1'),
+				'uid_initiator' => $qb->expr()->literal('user1'),
+				'item_type'     => $qb->expr()->literal('file'),
+				'file_source'   => $qb->expr()->literal(1),
+				'file_target'   => $qb->expr()->literal('myTarget1'),
+				'permissions'   => $qb->expr()->literal(2)
+			])->execute();
+		$this->assertEquals(1, $stmt);
+		$id = $qb->getLastInsertId();
+
+		$user1 = $this->getMock('\OCP\IUser');
+		$user1->method('getUID')->willReturn('user1');
+		$user2 = $this->getMock('\OCP\IUser');
+		$user2->method('getUID')->willReturn('user2');
+		$this->userManager->method('get')->will($this->returnValueMap([
+			['user1', $user1],
+			['user2', $user2],
+		]));
+
+		$file = $this->getMock('\OCP\Files\File');
+		$file->method('getId')->willReturn(1);
+
+		$this->rootFolder->method('getUserFolder')->with('user1')->will($this->returnSelf());
+		$this->rootFolder->method('getById')->with(1)->willReturn([$file]);
+
+		$share = $this->provider->getShareById($id);
+
+		$this->provider->deleteFromSelf($share, $user2);
+
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->select('*')
+			->from('share')
+			->where($qb->expr()->eq('id', $qb->createNamedParameter($id)))
+			->execute();
+
+		$shares = $stmt->fetchAll();
+		$stmt->closeCursor();
+
+		$this->assertCount(0, $shares);
+	}
+
+	/**
+	 * @expectedException \OC\Share20\Exception\ProviderException
+	 * @expectedExceptionMessage Recipient does not match
+	 */
+	public function testDeleteFromSelfUserNotRecipient() {
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->insert('share')
+			->values([
+				'share_type'    => $qb->expr()->literal(\OCP\Share::SHARE_TYPE_USER),
+				'share_with'    => $qb->expr()->literal('user2'),
+				'uid_owner'     => $qb->expr()->literal('user1'),
+				'uid_initiator' => $qb->expr()->literal('user1'),
+				'item_type'     => $qb->expr()->literal('file'),
+				'file_source'   => $qb->expr()->literal(1),
+				'file_target'   => $qb->expr()->literal('myTarget1'),
+				'permissions'   => $qb->expr()->literal(2)
+			])->execute();
+		$this->assertEquals(1, $stmt);
+		$id = $qb->getLastInsertId();
+
+		$user1 = $this->getMock('\OCP\IUser');
+		$user1->method('getUID')->willReturn('user1');
+		$user2 = $this->getMock('\OCP\IUser');
+		$user2->method('getUID')->willReturn('user2');
+		$user3 = $this->getMock('\OCP\IUser');
+		$this->userManager->method('get')->will($this->returnValueMap([
+			['user1', $user1],
+			['user2', $user2],
+		]));
+
+		$file = $this->getMock('\OCP\Files\File');
+		$file->method('getId')->willReturn(1);
+
+		$this->rootFolder->method('getUserFolder')->with('user1')->will($this->returnSelf());
+		$this->rootFolder->method('getById')->with(1)->willReturn([$file]);
+
+		$share = $this->provider->getShareById($id);
+
+		$this->provider->deleteFromSelf($share, $user3);
+	}
+
+	/**
+	 * @expectedException \OC\Share20\Exception\ProviderException
+	 * @expectedExceptionMessage Invalid shareType
+	 */
+	public function testDeleteFromSelfLink() {
+		$qb = $this->dbConn->getQueryBuilder();
+		$stmt = $qb->insert('share')
+			->values([
+				'share_type'    => $qb->expr()->literal(\OCP\Share::SHARE_TYPE_LINK),
+				'uid_owner'     => $qb->expr()->literal('user1'),
+				'uid_initiator' => $qb->expr()->literal('user1'),
+				'item_type'     => $qb->expr()->literal('file'),
+				'file_source'   => $qb->expr()->literal(1),
+				'file_target'   => $qb->expr()->literal('myTarget1'),
+				'permissions'   => $qb->expr()->literal(2),
+				'token'         => $qb->expr()->literal('token'),
+			])->execute();
+		$this->assertEquals(1, $stmt);
+		$id = $qb->getLastInsertId();
+
+		$user1 = $this->getMock('\OCP\IUser');
+		$user1->method('getUID')->willReturn('user1');
+		$this->userManager->method('get')->will($this->returnValueMap([
+			['user1', $user1],
+		]));
+
+		$file = $this->getMock('\OCP\Files\File');
+		$file->method('getId')->willReturn(1);
+
+		$this->rootFolder->method('getUserFolder')->with('user1')->will($this->returnSelf());
+		$this->rootFolder->method('getById')->with(1)->willReturn([$file]);
+
+		$share = $this->provider->getShareById($id);
+
+		$this->provider->deleteFromSelf($share, $user1);
+	}
 }