RequestHandlerController::assertIncomingSharingEnabled() - Code Metrics - Inspection of "[WIP] Federated sharing new spec" - owncloud/core - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#32303)

by Victor

created 2018-09-26 16:06 UTC

RequestHandlerController::assertIncomingSharingEnabled() A

↳ Parent: Project

Complexity

Conditions	3
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
nc	2
nop	0
dl	0
loc	7
rs	10
c	0
b	0
f	0

<?php
/**
 * @author Arthur Schiwon <[email protected]>
 * @author Björn Schießle <[email protected]>
 * @author Joas Schilling <[email protected]>
 * @author Lukas Reschke <[email protected]>
 * @author Morris Jobke <[email protected]>
 * @author Thomas Müller <[email protected]>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

namespace OCA\FederatedFileSharing\Controller;

use OC\OCS\Result;
use OCA\FederatedFileSharing\Address;
use OCA\FederatedFileSharing\AddressHandler;
use OCA\FederatedFileSharing\FedShareManager;
use OCA\FederatedFileSharing\Middleware\OcmMiddleware;
use OCA\FederatedFileSharing\Ocm\Exception\BadRequestException;
use OCA\FederatedFileSharing\Ocm\Exception\NotImplementedException;
use OCA\FederatedFileSharing\Ocm\Exception\OcmException;
use OCP\AppFramework\Http;
use OCP\AppFramework\OCSController;
use OCP\Constants;
use OCP\IRequest;
use OCP\IUserManager;
use OCP\Share\IShare;

/**
 * Class RequestHandlerController
 *
 * Handles OCS Request to the federated share API
 *
 * @package OCA\FederatedFileSharing\API
 */
class RequestHandlerController extends OCSController {

	/** @var OcmMiddleware */
	private $ocmMiddleware;

	/** @var IUserManager */
	private $userManager;

	/** @var AddressHandler */
	private $addressHandler;

	/** @var  FedShareManager */
	private $fedShareManager;

	/**
	 * Server2Server constructor.
	 *
	 * @param string $appName
	 * @param IRequest $request
	 * @param OcmMiddleware $ocmMiddleware
	 * @param IUserManager $userManager
	 * @param AddressHandler $addressHandler
	 * @param FedShareManager $fedShareManager
	 */
	public function __construct($appName,
								IRequest $request,
								OcmMiddleware $ocmMiddleware,
								IUserManager $userManager,
								AddressHandler $addressHandler,
								FedShareManager $fedShareManager
	) {
		parent::__construct($appName, $request);

		$this->ocmMiddleware = $ocmMiddleware;
		$this->userManager = $userManager;
		$this->addressHandler = $addressHandler;
		$this->fedShareManager = $fedShareManager;
	}

	/**
	 * @NoCSRFRequired
	 * @PublicPage
	 *
	 * create a new share
	 *
	 * @return Result
	 */
	public function createShare() {
		try {
			$this->ocmMiddleware->assertIncomingSharingEnabled();
			$remote = $this->request->getParam('remote', null);
			$token = $this->request->getParam('token', null);
			$name = $this->request->getParam('name', null);
			$owner = $this->request->getParam('owner', null);
			$sharedBy = $this->request->getParam('sharedBy', null);
			$shareWith = $this->request->getParam('shareWith', null);
			$remoteId = $this->request->getParam('remoteId', null);
			$sharedByFederatedId = $this->request->getParam(
				'sharedByFederatedId',
				null
			);
			$ownerFederatedId = $this->request->getParam('ownerFederatedId', null);
			$this->ocmMiddleware->assertNotNull(
				[
					'remote' => $remote,
					'token' => $token,
					'name' => $name,
					'owner' => $owner,
					'remoteId' => $remoteId,
					'shareWith' => $shareWith
				]
			);

			if (!\OCP\Util::isValidFileName($name)) {
				throw new BadRequestException(
					'The mountpoint name contains invalid characters.'
				);
			}
			// FIXME this should be a method in the user management instead
			\OCP\Util::writeLog('files_sharing', 'shareWith before, ' . $shareWith, \OCP\Util::DEBUG);
			\OCP\Util::emitHook(
				'\OCA\Files_Sharing\API\Server2Server',
				'preLoginNameUsedAsUserName',
				['uid' => &$shareWith]
			);
			\OCP\Util::writeLog('files_sharing', 'shareWith after, ' . $shareWith, \OCP\Util::DEBUG);
			if (!$this->userManager->userExists($shareWith)) {
				throw new BadRequestException('User does not exist');
			}

			if ($ownerFederatedId === null) {
				$ownerFederatedId = $owner . '@' . $this->addressHandler->normalizeRemote($remote);
			}
			// if the owner of the share and the initiator are the same user
			// we also complete the federated share ID for the initiator
			if ($sharedByFederatedId === null && $owner === $sharedBy) {
				$sharedByFederatedId = $ownerFederatedId;
			}

			$ownerAddress = new Address($ownerFederatedId);
			$sharedByAddress = new Address($sharedByFederatedId);

			$this->fedShareManager->createShare(
				$ownerAddress,
				$sharedByAddress,
				$shareWith,
				$remoteId,
				$name,
				$token
			);
		} catch (OcmException $e) {
			return new Result(
				null,
				$e->getHttpStatusCode(),
				$e->getMessage()
			);
		} catch (\Exception $e) {
			\OCP\Util::writeLog(
				'files_sharing',
				'server can not add remote share, ' . $e->getMessage(),
				\OCP\Util::ERROR
			);
			return new Result(
				null,
				Http::STATUS_INTERNAL_SERVER_ERROR,
				'internal server error, was not able to add share from ' . $remote
function myFunction($a) {
    switch ($a) {
        case 'foo':
            $x = 1;
            break;

        case 'bar':
            $x = 2;
            break;
    }

    // $x is potentially undefined here.
    echo $x;
}
			);
		}
		return new Result();
	}

	/**
	 * @NoCSRFRequired
	 * @PublicPage
	 *
	 * create re-share on behalf of another user
	 *
	 * @param int $id
	 *
	 * @return Result
	 */
	public function reShare($id) {
		$token = $this->request->getParam('token', null);
		$shareWith = $this->request->getParam('shareWith', null);
		$permission = $this->request->getParam('permission', null);
		$remoteId = $this->request->getParam('remoteId', null);

		try {
			$this->ocmMiddleware->assertNotNull(
				[
					'id' => $id,
					'token' => $token,
					'shareWith' => $shareWith,
					'permission'  => $permission,
					'remoteId' => $remoteId
				]
			);
			$permission = (int) $permission;
			$remoteId = (int) $remoteId;
			$share = $this->ocmMiddleware->getValidShare($id, $token);

			// don't allow to share a file back to the owner
			list($user, $remote) = $this->addressHandler->splitUserRemote($shareWith);
			$owner = $share->getShareOwner();
			$currentServer = $this->addressHandler->generateRemoteURL();
			if ($this->addressHandler->compareAddresses($user, $remote, $owner, $currentServer)) {
				return new Result(null, Http::STATUS_FORBIDDEN);
			}

			$reSharingAllowed = $share->getPermissions() & Constants::PERMISSION_SHARE;
			if (!$reSharingAllowed) {
				return new Result(null, Http::STATUS_BAD_REQUEST);
			}
			$result = $this->fedShareManager->reShare(
				$share,
				$remoteId,
				$shareWith,
				$permission
			);
		} catch (BadRequestException $e) {
			return new Result(null, Http::STATUS_FORBIDDEN);
		} catch (\Exception $e) {
			return new Result(null, Http::STATUS_BAD_REQUEST);
		}

		return new Result(
			[
				'token' => $result->getToken(),
				'remoteId' => $result->getId()
			]
		);
	}

	/**
	 * @NoCSRFRequired
	 * @PublicPage
	 *
	 * accept server-to-server share
	 *
	 * @param int $id
	 *
	 * @return Result
	 */
	public function acceptShare($id) {
		try {
			$this->ocmMiddleware->assertOutgoingSharingEnabled();
			$token = $this->request->getParam('token', null);
			$share = $this->ocmMiddleware->getValidShare($id, $token);
			$this->fedShareManager->acceptShare($share);
		} catch (NotImplementedException $e) {
			return new Result(
				null,
				Http::STATUS_SERVICE_UNAVAILABLE,
				'Server does not support federated cloud sharing'
			);
		}
		return new Result();
	}

	/**
	 * @NoCSRFRequired
	 * @PublicPage
	 *
	 * decline server-to-server share
	 *
	 * @param int $id
	 *
	 * @return Result
	 */
	public function declineShare($id) {
		try {
			$token = $this->request->getParam('token', null);
			$this->ocmMiddleware->assertOutgoingSharingEnabled();
			$share = $this->ocmMiddleware->getValidShare($id, $token);
			$this->fedShareManager->declineShare($share);
		} catch (NotImplementedException $e) {
			return new Result(
				null,
				Http::STATUS_SERVICE_UNAVAILABLE,
				'Server does not support federated cloud sharing'
			);
		}

		return new Result();
	}

	/**
	 * @NoCSRFRequired
	 * @PublicPage
	 *
	 * remove server-to-server share if it was unshared by the owner
	 *
	 * @param int $id
	 *
	 * @return Result
	 */
	public function unshare($id) {
		try {
			$this->ocmMiddleware->assertOutgoingSharingEnabled();
			$token = $this->request->getParam('token', null);
			if ($token && $id) {
				$this->fedShareManager->unshare($id, $token);
			}
		} catch (NotImplementedException $e) {
			return new Result(
				null,
				Http::STATUS_SERVICE_UNAVAILABLE,
				'Server does not support federated cloud sharing'
			);
		} catch (\Exception $e) {
			// pass
		}
		return new Result();
	}

	/**
	 * @NoCSRFRequired
	 * @PublicPage
	 *
	 * federated share was revoked, either by the owner or the re-sharer
	 *
	 * @param int $id
	 *
	 * @return Result
	 */
	public function revoke($id) {
		try {
			$token = $this->request->getParam('token', null);
			$share = $this->getValidShare($id, $token);
			$this->fedShareManager->revoke($share);
		} catch (\Exception $e) {
			return new Result(null, Http::STATUS_BAD_REQUEST);
		}

		return new Result();
	}

	/**
	 * @NoCSRFRequired
	 * @PublicPage
	 *
	 * update share information to keep federated re-shares in sync
	 *
	 * @param int $id
	 *
	 * @return Result
	 */
	public function updatePermissions($id) {
		try {
			$permissions = $this->request->getParam('permissions', null);
			$token = $this->request->getParam('token', null);
			$share = $this->ocmMiddleware->getValidShare($id, $token);
			$validPermission = \ctype_digit((string)$permissions);
			if (!$validPermission) {
				throw new \Exception();
			}
			$this->fedShareManager->updatePermissions($share, (int)$permissions);
		} catch (\Exception $e) {
			return new Result(null, Http::STATUS_BAD_REQUEST);
		}

		return new Result();
	}
}


1		<?php
2		/**
3		* @author Arthur Schiwon <[email protected]>
4		* @author Björn Schießle <[email protected]>
5		* @author Joas Schilling <[email protected]>
6		* @author Lukas Reschke <[email protected]>
7		* @author Morris Jobke <[email protected]>
8		* @author Thomas Müller <[email protected]>
9		*
10		* @copyright Copyright (c) 2018, ownCloud GmbH
11		* @license AGPL-3.0
12		*
13		* This code is free software: you can redistribute it and/or modify
14		* it under the terms of the GNU Affero General Public License, version 3,
15		* as published by the Free Software Foundation.
16		*
17		* This program is distributed in the hope that it will be useful,
18		* but WITHOUT ANY WARRANTY; without even the implied warranty of
19		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20		* GNU Affero General Public License for more details.
21		*
22		* You should have received a copy of the GNU Affero General Public License, version 3,
23		* along with this program. If not, see <http://www.gnu.org/licenses/>
24		*
25		*/
26
27		namespace OCA\FederatedFileSharing\Controller;
28
29		use OC\OCS\Result;
30		use OCA\FederatedFileSharing\Address;
31		use OCA\FederatedFileSharing\AddressHandler;
32		use OCA\FederatedFileSharing\FedShareManager;
33		use OCA\FederatedFileSharing\Middleware\OcmMiddleware;
34		use OCA\FederatedFileSharing\Ocm\Exception\BadRequestException;
35		use OCA\FederatedFileSharing\Ocm\Exception\NotImplementedException;
36		use OCA\FederatedFileSharing\Ocm\Exception\OcmException;
37		use OCP\AppFramework\Http;
38		use OCP\AppFramework\OCSController;
39		use OCP\Constants;
40		use OCP\IRequest;
41		use OCP\IUserManager;
42		use OCP\Share\IShare;
43
44		/**
45		* Class RequestHandlerController
46		*
47		* Handles OCS Request to the federated share API
48		*
49		* @package OCA\FederatedFileSharing\API
50		*/
51		class RequestHandlerController extends OCSController {
52
53		/** @var OcmMiddleware */
54		private $ocmMiddleware;
55
56		/** @var IUserManager */
57		private $userManager;
58
59		/** @var AddressHandler */
60		private $addressHandler;
61
62		/** @var FedShareManager */
63		private $fedShareManager;
64
65		/**
66		* Server2Server constructor.
67		*
68		* @param string $appName
69		* @param IRequest $request
70		* @param OcmMiddleware $ocmMiddleware
71		* @param IUserManager $userManager
72		* @param AddressHandler $addressHandler
73		* @param FedShareManager $fedShareManager
74		*/
75		public function __construct($appName,
76		IRequest $request,
77		OcmMiddleware $ocmMiddleware,
78		IUserManager $userManager,
79		AddressHandler $addressHandler,
80		FedShareManager $fedShareManager
81		) {
82		parent::__construct($appName, $request);
83
84		$this->ocmMiddleware = $ocmMiddleware;
85		$this->userManager = $userManager;
86		$this->addressHandler = $addressHandler;
87		$this->fedShareManager = $fedShareManager;
88		}
89
90		/**
91		* @NoCSRFRequired
92		* @PublicPage
93		*
94		* create a new share
95		*
96		* @return Result
97		*/
98		public function createShare() {
99		try {
100		$this->ocmMiddleware->assertIncomingSharingEnabled();
101		$remote = $this->request->getParam('remote', null);
102		$token = $this->request->getParam('token', null);
103		$name = $this->request->getParam('name', null);
104		$owner = $this->request->getParam('owner', null);
105		$sharedBy = $this->request->getParam('sharedBy', null);
106		$shareWith = $this->request->getParam('shareWith', null);
107		$remoteId = $this->request->getParam('remoteId', null);
108		$sharedByFederatedId = $this->request->getParam(
109		'sharedByFederatedId',
110		null
111		);
112		$ownerFederatedId = $this->request->getParam('ownerFederatedId', null);
113		$this->ocmMiddleware->assertNotNull(
114		[
115		'remote' => $remote,
116		'token' => $token,
117		'name' => $name,
118		'owner' => $owner,
119		'remoteId' => $remoteId,
120		'shareWith' => $shareWith
121		]
122		);
123
124		if (!\OCP\Util::isValidFileName($name)) {
125		throw new BadRequestException(
126		'The mountpoint name contains invalid characters.'
127		);
128		}
129		// FIXME this should be a method in the user management instead
130		\OCP\Util::writeLog('files_sharing', 'shareWith before, ' . $shareWith, \OCP\Util::DEBUG);
131		\OCP\Util::emitHook(
132		'\OCA\Files_Sharing\API\Server2Server',
133		'preLoginNameUsedAsUserName',
134		['uid' => &$shareWith]
135		);
136		\OCP\Util::writeLog('files_sharing', 'shareWith after, ' . $shareWith, \OCP\Util::DEBUG);
137		if (!$this->userManager->userExists($shareWith)) {
138		throw new BadRequestException('User does not exist');
139		}
140
141		if ($ownerFederatedId === null) {
142		$ownerFederatedId = $owner . '@' . $this->addressHandler->normalizeRemote($remote);
143		}
144		// if the owner of the share and the initiator are the same user
145		// we also complete the federated share ID for the initiator
146		if ($sharedByFederatedId === null && $owner === $sharedBy) {
147		$sharedByFederatedId = $ownerFederatedId;
148		}
149
150		$ownerAddress = new Address($ownerFederatedId);
151		$sharedByAddress = new Address($sharedByFederatedId);
152
153		$this->fedShareManager->createShare(
154		$ownerAddress,
155		$sharedByAddress,
156		$shareWith,
157		$remoteId,
158		$name,
159		$token
160		);
161		} catch (OcmException $e) {
162		return new Result(
163		null,
164		$e->getHttpStatusCode(),
165		$e->getMessage()
166		);
167		} catch (\Exception $e) {
168		\OCP\Util::writeLog(
169		'files_sharing',
170		'server can not add remote share, ' . $e->getMessage(),
171		\OCP\Util::ERROR
172		);
173		return new Result(
174		null,
175		Http::STATUS_INTERNAL_SERVER_ERROR,
176		'internal server error, was not able to add share from ' . $remote
		0 ignored issues – show Bug introduced 2018-07-13 21:09 UTC by Report Bug Copy Issue Report The variable `$remote` does not seem to be defined for all execution paths leading up to this point. If you define a variable conditionally, it can happen that it is not defined for all execution paths. Let’s take a look at an example: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } // $x is potentially undefined here. echo $x; } In the above example, the variable `$x` is defined if you pass “foo” or “bar” as argument for `$a`. However, since the `switch` statement has no default case statement, if you pass any other value, the variable `$x` would be undefined. Available Fixes Check for existence of the variable explicitly: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } if (isset($x)) { // Make sure it's always set. echo $x; } } Define a default value for the variable: function myFunction($a) { $x = ''; // Set a default which gets overridden for certain paths. switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; } echo $x; } Add a value for the missing path: function myFunction($a) { switch ($a) { case 'foo': $x = 1; break; case 'bar': $x = 2; break; // We add support for the missing case. default: $x = ''; break; } echo $x; } Loading history...
177		);
178		}
179		return new Result();
180		}
181
182		/**
183		* @NoCSRFRequired
184		* @PublicPage
185		*
186		* create re-share on behalf of another user
187		*
188		* @param int $id
189		*
190		* @return Result
191		*/
192		public function reShare($id) {
193		$token = $this->request->getParam('token', null);
194		$shareWith = $this->request->getParam('shareWith', null);
195		$permission = $this->request->getParam('permission', null);
196		$remoteId = $this->request->getParam('remoteId', null);
197
198		try {
199		$this->ocmMiddleware->assertNotNull(
200		[
201		'id' => $id,
202		'token' => $token,
203		'shareWith' => $shareWith,
204		'permission' => $permission,
205		'remoteId' => $remoteId
206		]
207		);
208		$permission = (int) $permission;
209		$remoteId = (int) $remoteId;
210		$share = $this->ocmMiddleware->getValidShare($id, $token);
211
212		// don't allow to share a file back to the owner
213		list($user, $remote) = $this->addressHandler->splitUserRemote($shareWith);
214		$owner = $share->getShareOwner();
215		$currentServer = $this->addressHandler->generateRemoteURL();
216		if ($this->addressHandler->compareAddresses($user, $remote, $owner, $currentServer)) {
217		return new Result(null, Http::STATUS_FORBIDDEN);
218		}
219
220		$reSharingAllowed = $share->getPermissions() & Constants::PERMISSION_SHARE;
221		if (!$reSharingAllowed) {
222		return new Result(null, Http::STATUS_BAD_REQUEST);
223		}
224		$result = $this->fedShareManager->reShare(
225		$share,
226		$remoteId,
227		$shareWith,
228		$permission
229		);
230		} catch (BadRequestException $e) {
231		return new Result(null, Http::STATUS_FORBIDDEN);
232		} catch (\Exception $e) {
233		return new Result(null, Http::STATUS_BAD_REQUEST);
234		}
235
236		return new Result(
237		[
238		'token' => $result->getToken(),
239		'remoteId' => $result->getId()
240		]
241		);
242		}
243
244		/**
245		* @NoCSRFRequired
246		* @PublicPage
247		*
248		* accept server-to-server share
249		*
250		* @param int $id
251		*
252		* @return Result
253		*/
254	View Code Duplication	public function acceptShare($id) {
255		try {
256		$this->ocmMiddleware->assertOutgoingSharingEnabled();
257		$token = $this->request->getParam('token', null);
258		$share = $this->ocmMiddleware->getValidShare($id, $token);
259		$this->fedShareManager->acceptShare($share);
260		} catch (NotImplementedException $e) {
261		return new Result(
262		null,
263		Http::STATUS_SERVICE_UNAVAILABLE,
264		'Server does not support federated cloud sharing'
265		);
266		}
267		return new Result();
268		}
269
270		/**
271		* @NoCSRFRequired
272		* @PublicPage
273		*
274		* decline server-to-server share
275		*
276		* @param int $id
277		*
278		* @return Result
279		*/
280	View Code Duplication	public function declineShare($id) {
281		try {
282		$token = $this->request->getParam('token', null);
283		$this->ocmMiddleware->assertOutgoingSharingEnabled();
284		$share = $this->ocmMiddleware->getValidShare($id, $token);
285		$this->fedShareManager->declineShare($share);
286		} catch (NotImplementedException $e) {
287		return new Result(
288		null,
289		Http::STATUS_SERVICE_UNAVAILABLE,
290		'Server does not support federated cloud sharing'
291		);
292		}
293
294		return new Result();
295		}
296
297		/**
298		* @NoCSRFRequired
299		* @PublicPage
300		*
301		* remove server-to-server share if it was unshared by the owner
302		*
303		* @param int $id
304		*
305		* @return Result
306		*/
307	View Code Duplication	public function unshare($id) {
308		try {
309		$this->ocmMiddleware->assertOutgoingSharingEnabled();
310		$token = $this->request->getParam('token', null);
311		if ($token && $id) {
312		$this->fedShareManager->unshare($id, $token);
313		}
314		} catch (NotImplementedException $e) {
315		return new Result(
316		null,
317		Http::STATUS_SERVICE_UNAVAILABLE,
318		'Server does not support federated cloud sharing'
319		);
320		} catch (\Exception $e) {
321		// pass
322		}
323		return new Result();
324		}
325
326		/**
327		* @NoCSRFRequired
328		* @PublicPage
329		*
330		* federated share was revoked, either by the owner or the re-sharer
331		*
332		* @param int $id
333		*
334		* @return Result
335		*/
336	View Code Duplication	public function revoke($id) {
337		try {
338		$token = $this->request->getParam('token', null);
339		$share = $this->getValidShare($id, $token);
340		$this->fedShareManager->revoke($share);
341		} catch (\Exception $e) {
342		return new Result(null, Http::STATUS_BAD_REQUEST);
343		}
344
345		return new Result();
346		}
347
348		/**
349		* @NoCSRFRequired
350		* @PublicPage
351		*
352		* update share information to keep federated re-shares in sync
353		*
354		* @param int $id
355		*
356		* @return Result
357		*/
358		public function updatePermissions($id) {
359		try {
360		$permissions = $this->request->getParam('permissions', null);
361		$token = $this->request->getParam('token', null);
362		$share = $this->ocmMiddleware->getValidShare($id, $token);
363		$validPermission = \ctype_digit((string)$permissions);
364		if (!$validPermission) {
365		throw new \Exception();
366		}
367		$this->fedShareManager->updatePermissions($share, (int)$permissions);
368		} catch (\Exception $e) {
369		return new Result(null, Http::STATUS_BAD_REQUEST);
370		}
371
372		return new Result();
373		}
374		}
375

owncloud / core

Pull Request — master (#32303)

RequestHandlerController::assertIncomingSharingEnabled() A

Complexity

Size

Duplication

Importance

Available Fixes

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