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<?php
/**
* Circles - Bring cloud-users closer together.
*
* This file is licensed under the Affero General Public License version 3 or
* later. See the COPYING file.
*
* @author Maxence Lange <maxence@pontapreta.net>
* @copyright 2017
* @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 OCA\Circles\Service;
use Exception;
use OC\Http\Client\ClientService;
use OCA\Circles\Api\v1\Circles;
use OCA\Circles\Db\CirclesRequest;
use OCA\Circles\Db\FederatedLinksRequest;
use OCA\Circles\Exceptions\CircleDoesNotExistException;
use OCA\Circles\Exceptions\FederatedCircleLinkFormatException;
use OCA\Circles\Exceptions\FederatedCircleNotAllowedException;
use OCA\Circles\Exceptions\CircleTypeNotValidException;
use OCA\Circles\Exceptions\FederatedCircleStatusUpdateException;
use OCA\Circles\Exceptions\FederatedLinkUpdateException;
use OCA\Circles\Exceptions\FederatedRemoteCircleDoesNotExistException;
use OCA\Circles\Exceptions\FederatedRemoteDoesNotAllowException;
use OCA\Circles\Exceptions\FederatedRemoteIsDownException;
use OCA\Circles\Exceptions\PayloadDeliveryException;
use OCA\Circles\Exceptions\SharingFrameAlreadyExistException;
use OCA\Circles\Exceptions\FederatedLinkCreationException;
use OCA\Circles\Exceptions\MemberIsNotAdminException;
use OCA\Circles\Exceptions\SharingFrameDoesNotExistException;
use OCA\Circles\Model\Circle;
use OCA\Circles\Model\FederatedLink;
use OCA\Circles\Model\SharingFrame;
use OCP\IL10N;
class FederatedService {
const REMOTE_URL_LINK = '/index.php/apps/circles/v1/link';
const REMOTE_URL_PAYLOAD = '/index.php/apps/circles/v1/payload';
/** @var string */
private $userId;
/** @var IL10N */
private $l10n;
/** @var CirclesRequest */
private $circlesRequest;
/** @var ConfigService */
private $configService;
/** @var CirclesService */
private $circlesService;
/** @var BroadcastService */
private $broadcastService;
/** @var FederatedLinksRequest */
private $federatedLinksRequest;
/** @var EventsService */
private $eventsService;
/** @var string */
private $serverHost;
/** @var ClientService */
private $clientService;
/** @var MiscService */
private $miscService;
/**
* CirclesService constructor.
*
* @param $userId
* @param IL10N $l10n
* @param CirclesRequest $circlesRequest
* @param ConfigService $configService
* @param CirclesService $circlesService
* @param BroadcastService $broadcastService
* @param FederatedLinksRequest $federatedLinksRequest
* @param EventsService $eventsService
* @param ClientService $clientService
* @param MiscService $miscService
*/
public function __construct(
$userId,
IL10N $l10n,
CirclesRequest $circlesRequest,
ConfigService $configService,
CirclesService $circlesService,
BroadcastService $broadcastService,
FederatedLinksRequest $federatedLinksRequest,
EventsService $eventsService,
ClientService $clientService,
MiscService $miscService
) {
$this->userId = $userId;
$this->l10n = $l10n;
$this->circlesRequest = $circlesRequest;
$this->configService = $configService;
$this->circlesService = $circlesService;
$this->broadcastService = $broadcastService;
$this->federatedLinksRequest = $federatedLinksRequest;
$this->eventsService = $eventsService;
$this->serverHost = $this->configService->getLocalAddress();
$this->clientService = $clientService;
$this->miscService = $miscService;
}
/**
* linkCircle();
*
* link to a circle.
* Function will check if settings allow Federated links between circles, and the format of
* the link ($remote). If no exception, a request to the remote circle will be initiated
* using requestLinkWithCircle()
*
* $remote format: <circle_name>@<remote_host>
*
* @param string $circleUniqueId
* @param string $remote
*
* @throws Exception
* @throws FederatedCircleLinkFormatException
* @throws CircleTypeNotValidException
*
* @return FederatedLink
*/
public function linkCircle($circleUniqueId, $remote) {
if (!$this->configService->isFederatedCirclesAllowed()) {
throw new FederatedCircleNotAllowedException(
$this->l10n->t("Federated circles are not allowed on this Nextcloud")
);
}
if (strpos($remote, '@') === false) {
throw new FederatedCircleLinkFormatException(
$this->l10n->t("Federated link does not have a valid format")
);
}
try {
return $this->requestLinkWithCircle($circleUniqueId, $remote);
} catch (Exception $e) {
throw $e;
}
}
/**
* linkStatus()
*
* Update the status of a link.
* Function will check if user can edit the status, will update it and send the update to
* remote
*
* @param int $linkId
* @param int $status
*
* @throws Exception
* @throws FederatedCircleLinkFormatException
* @throws CircleTypeNotValidException
* @throws MemberIsNotAdminException
*
* @return FederatedLink[]
*/
public function linkStatus($linkId, $status) {
$status = (int)$status;
$link = null;
try {
$link = $this->circlesRequest->getLinkFromId($linkId);
$circle = $this->circlesRequest->getCircle($link->getCircleId(), $this->userId);
$circle->hasToBeFederated();
$circle->getHigherViewer()
->hasToBeAdmin();
$link->hasToBeValidStatusUpdate($status);
if (!$this->eventOnLinkStatus($circle, $link, $status)) {
return $this->circlesRequest->getLinksFromCircle($circle->getUniqueId());
}
} catch (Exception $e) {
throw $e;
}
$link->setStatus($status);
$link->setCircleId($circle->getUniqueId(true));
try {
$this->updateLinkRemote($link);
} catch (Exception $e) {
if ($status !== FederatedLink::STATUS_LINK_REMOVE) {
throw $e;
}
}
$this->federatedLinksRequest->update($link);
return $this->circlesRequest->getLinksFromCircle($circle->getUniqueId());
}
/**
* eventOnLinkStatus();
*
* Called by linkStatus() to manage events when status is changing.
* If status does not need update, returns false;
*
* @param Circle $circle
* @param FederatedLink $link
* @param $status
*
* @return bool
*/
private function eventOnLinkStatus(Circle $circle, FederatedLink $link, $status) {
if ($link->getStatus() === $status) {
return false;
}
if ($status === FederatedLink::STATUS_LINK_REMOVE) {
$this->eventsService->onLinkRemove($circle, $link);
}
if ($status === FederatedLink::STATUS_LINK_UP) {
$this->eventsService->onLinkRequestAccepting($circle, $link);
$this->eventsService->onLinkUp($circle, $link);
}
return true;
}
/**
* requestLinkWithCircle()
*
* Using CircleId, function will get more infos from the database.
* Will check if author is at least admin and initiate a FederatedLink, save it
* in the database and send a request to the remote circle using requestLink()
* If any issue, entry is removed from the database.
*
* @param string $circleUniqueId
* @param string $remote
*
* @return FederatedLink
* @throws Exception
*/
private function requestLinkWithCircle($circleUniqueId, $remote) {
$link = null;
try {
list($remoteCircle, $remoteAddress) = explode('@', $remote, 2);
$circle = $this->circlesService->detailsCircle($circleUniqueId);
$circle->getHigherViewer()
->hasToBeAdmin();
$circle->hasToBeFederated();
$circle->cantBePersonal();
$link = new FederatedLink();
$link->setCircleId($circleUniqueId)
->setLocalAddress($this->serverHost)
->setAddress($remoteAddress)
->setRemoteCircleName($remoteCircle)
->setStatus(FederatedLink::STATUS_LINK_SETUP)
->generateToken();
$this->federatedLinksRequest->create($link);
$this->requestLink($circle, $link);
} catch (Exception $e) {
if ($link !== null) {
$this->federatedLinksRequest->delete($link);
}
throw $e;
}
return $link;
}
/**
* @param string $remote
*
* @return string
*/
private function generateLinkRemoteURL($remote) {
return $this->generateRemoteHost($remote) . self::REMOTE_URL_LINK;
}
/**
* @param string $remote
*
* @return string
*/
private function generatePayloadDeliveryURL($remote) {
return $this->generateRemoteHost($remote) . self::REMOTE_URL_PAYLOAD;
}
/**
* @param string $remote
*
* @return string
*/
private function generateRemoteHost($remote) {
if ((!$this->configService->isNonSSLLinksAllowed() || strpos($remote, 'http://') !== 0)
&& strpos($remote, 'https://') !== 0
) {
$remote = 'https://' . $remote;
}
return rtrim($remote, '/');
}
/**
* requestLink()
*
*
* @param Circle $circle
* @param FederatedLink $link
*
* @return boolean
* @throws Exception
*/
private function requestLink(Circle $circle, FederatedLink &$link) {
$args = [
'apiVersion' => Circles::version(),
'token' => $link->getToken(true),
'uniqueId' => $circle->getUniqueId(true),
'sourceName' => $circle->getName(),
'linkTo' => $link->getRemoteCircleName(),
'address' => $link->getLocalAddress()
];
$client = $this->clientService->newClient();
try {
$request = $client->put(
$this->generateLinkRemoteURL($link->getAddress()), [
'body' => $args,
'timeout' => 10,
'connect_timeout' => 10,
]
);
$result = json_decode($request->getBody(), true);
if ($result === null) {
throw new FederatedRemoteIsDownException(
$this->l10n->t(
'The remote host is down or the Circles app is not installed on it'
)
);
}
$this->eventOnRequestLink(
$circle, $link, $result['status'],
((key_exists('reason', $result)) ? $result['reason'] : '')
);
$link->setUniqueId($result['uniqueId']);
$this->federatedLinksRequest->update($link);
return true;
} catch (Exception $e) {
throw $e;
}
}
/**
* eventOnRequestLink();
*
* Called by requestLink() will update status and event
* Will also manage errors returned by the remote link
*
* @param Circle $circle
* @param FederatedLink $link
* @param $status
* @param $reason
*
* @throws Exception
*/
private function eventOnRequestLink(Circle $circle, FederatedLink $link, $status, $reason) {
try {
if ($status === FederatedLink::STATUS_LINK_UP) {
$link->setStatus(FederatedLink::STATUS_LINK_UP);
$this->eventsService->onLinkUp($circle, $link);
} else if ($status === FederatedLink::STATUS_LINK_REQUESTED) {
$link->setStatus(FederatedLink::STATUS_REQUEST_SENT);
$this->eventsService->onLinkRequestSent($circle, $link);
} else {
$this->parseRequestLinkError($reason);
}
} catch (Exception $e) {
throw $e;
}
}
/**
* parseRequestLinkError();
*
* Will parse the error reason returned by requestLink() and throw an Exception
*
* @param $reason
*
* @throws Exception
* @throws FederatedRemoteCircleDoesNotExistException
* @throws FederatedRemoteDoesNotAllowException
*/
private function parseRequestLinkError($reason) {
if ($reason === 'federated_not_allowed') {
throw new FederatedRemoteDoesNotAllowException(
$this->l10n->t('Federated circles are not allowed on the remote Nextcloud')
);
}
if ($reason === 'circle_links_disable') {
throw new FederatedRemoteDoesNotAllowException(
$this->l10n->t('The remote circle does not accept federated links')
);
}
if ($reason === 'duplicate_unique_id') {
throw new FederatedRemoteDoesNotAllowException(
$this->l10n->t('It seems that you are trying to link a circle to itself')
);
}
if ($reason === 'duplicate_link') {
throw new FederatedRemoteDoesNotAllowException(
$this->l10n->t('This link exists already')
);
}
if ($reason === 'circle_does_not_exist') {
throw new FederatedRemoteCircleDoesNotExistException(
$this->l10n->t('The requested remote circle does not exist')
);
}
throw new Exception($reason);
}
/**
* @param string $token
* @param string $uniqueId
* @param int $status
*
* @return FederatedLink
* @throws Exception
*/
public function updateLinkFromRemote($token, $uniqueId, $status) {
try {
$link = $this->circlesRequest->getLinkFromToken($token, $uniqueId);
$circle = $this->circlesRequest->forceGetCircle($link->getCircleId());
$circle->hasToBeFederated();
$this->checkUpdateLinkFromRemote($status);
$this->checkUpdateLinkFromRemoteLinkUp($circle, $link, $status);
$this->checkUpdateLinkFromRemoteLinkRemove($circle, $link, $status);
if ($link->getStatus() !== $status) {
$this->federatedLinksRequest->update($link);
}
return $link;
} catch (Exception $e) {
throw $e;
}
}
/**
* checkUpdateLinkFromRemote();
*
* will throw exception is the status sent by remote is not correct
*
* @param int $status
*
* @throws FederatedCircleStatusUpdateException
*/
private function checkUpdateLinkFromRemote($status) {
$status = (int)$status;
if ($status !== FederatedLink::STATUS_LINK_UP
&& $status !== FederatedLink::STATUS_LINK_REMOVE
) {
throw new FederatedCircleStatusUpdateException(
$this->l10n->t('Cannot proceed with this status update')
);
}
}
/**
* checkUpdateLinkFromRemoteLinkUp()
*
* in case of a request of status update from remote for a link up, we check the current
* status of the link locally.
*
* @param Circle $circle
* @param FederatedLink $link
* @param int $status
*
* @throws FederatedCircleStatusUpdateException
*/
private function checkUpdateLinkFromRemoteLinkUp(Circle $circle, FederatedLink $link, $status) {
if ((int)$status !== FederatedLink::STATUS_LINK_UP) {
return;
}
if ($link->getStatus() !== FederatedLink::STATUS_REQUEST_SENT) {
throw new FederatedCircleStatusUpdateException(
$this->l10n->t('Cannot proceed with this status update')
);
}
$this->eventsService->onLinkRequestAccepted($circle, $link);
$this->eventsService->onLinkUp($circle, $link);
$link->setStatus($status);
}
/**
* checkUpdateLinkFromRemoteLinkRemove();
*
* in case of a request of status update from remote for a link down, we check the current
* status of the link locally
*
* @param Circle $circle
* @param FederatedLink $link
* @param int $status
*
* @throws FederatedCircleStatusUpdateException
*/
private function checkUpdateLinkFromRemoteLinkRemove(
Circle $circle, FederatedLink $link, $status
) {
if ((int)$status !== FederatedLink::STATUS_LINK_REMOVE) {
return;
}
if ($link->getStatus() === FederatedLink::STATUS_REQUEST_SENT) {
$link->setStatus(FederatedLink::STATUS_REQUEST_DECLINED);
$this->eventsService->onLinkRequestRejected($circle, $link);
return;
}
if ($link->getStatus() === FederatedLink::STATUS_LINK_REQUESTED) {
$link->setStatus(FederatedLink::STATUS_LINK_REMOVE);
$this->eventsService->onLinkRequestCanceled($circle, $link);
return;
}
if ($link->getStatus() > FederatedLink::STATUS_LINK_DOWN) {
$link->setStatus(FederatedLink::STATUS_LINK_DOWN);
$this->eventsService->onLinkDown($circle, $link);
return;
}
throw new FederatedCircleStatusUpdateException(
$this->l10n->t('Cannot proceed with this status update')
);
}
/**
* updateLinkRemote()
*
* Send a request to the remote of the link to update its status.
*
* @param FederatedLink $link
*
* @return bool
* @throws Exception
*/
public function updateLinkRemote(FederatedLink &$link) {
$args = [
'apiVersion' => Circles::version(),
'token' => $link->getToken(true),
'uniqueId' => $link->getCircleId(true),
'status' => $link->getStatus()
];
$client = $this->clientService->newClient();
try {
$request = $client->post(
$this->generateLinkRemoteURL($link->getAddress()), [
'body' => $args,
'timeout' => 10,
'connect_timeout' => 10,
]
);
$result = json_decode($request->getBody(), true);
if ($result['status'] === -1) {
throw new FederatedLinkUpdateException($result['reason']);
}
return true;
} catch (Exception $e) {
throw $e;
}
}
/**
* Create a new link into database and assign the correct status.
*
* @param Circle $circle
* @param FederatedLink $link
*
* @throws Exception
*/
public function initiateLink(Circle $circle, FederatedLink &$link) {
try {
$this->checkLinkRequestValidity($circle, $link);
$link->setCircleId($circle->getUniqueId());
if ($circle->getSetting('allow_links_auto') === 'true') {
$link->setStatus(FederatedLink::STATUS_LINK_UP);
$this->eventsService->onLinkUp($circle, $link);
} else {
$link->setStatus(FederatedLink::STATUS_LINK_REQUESTED);
$this->eventsService->onLinkRequestReceived($circle, $link);
}
$this->federatedLinksRequest->create($link);
} catch (Exception $e) {
throw $e;
}
}
/**
* @param Circle $circle
* @param FederatedLink $link
*
* @throws FederatedLinkCreationException
*/
private function checkLinkRequestValidity($circle, $link) {
if ($circle->getUniqueId(true) === $link->getUniqueId(true)) {
throw new FederatedLinkCreationException('duplicate_unique_id');
}
if ($this->getLink($circle->getUniqueId(), $link->getUniqueId(true)) !== null) {
throw new FederatedLinkCreationException('duplicate_link');
}
if ($circle->getSetting('allow_links') !== 'true') {
throw new FederatedLinkCreationException('circle_links_disable');
}
}
/**
* @param string $token
* @param string $uniqueId
* @param SharingFrame $frame
*
* @return bool
* @throws Exception
*/
public function receiveFrame($token, $uniqueId, SharingFrame &$frame) {
try {
$link = $this->circlesRequest->getLinkFromToken((string)$token, (string)$uniqueId);
} catch (Exception $e) {
throw $e;
}
try {
$this->circlesRequest->getFrame($link->getCircleId(), $frame->getUniqueId());
throw new SharingFrameAlreadyExistException('shares_is_already_known');
} catch (SharingFrameDoesNotExistException $e) {
}
try {
$circle = $this->circlesRequest->forceGetCircle($link->getCircleId());
} catch (CircleDoesNotExistException $e) {
throw new CircleDoesNotExistException('unknown_circle');
}
$frame->setCircleId($link->getCircleId());
$frame->setCircleName($circle->getName());
$frame->setCircleType($circle->getType());
$this->circlesRequest->saveFrame($frame);
$this->broadcastService->broadcastFrame($frame->getHeader('broadcast'), $frame);
return true;
}
/**
* @param string $circleUniqueId
* @param string $uniqueId
*
* @return FederatedLink
*/
public function getLink($circleUniqueId, $uniqueId) {
return $this->federatedLinksRequest->getFromUniqueId($circleUniqueId, $uniqueId);
}
/**
* @param string $circleUniqueId
*
* @return FederatedLink[]
*/
public function getLinksFromCircle($circleUniqueId) {
return $this->federatedLinksRequest->getLinked($circleUniqueId);
}
/**
* @param string $circleUniqueId
* @param string $frameUniqueId
*
* @return bool
* @throws Exception
*/
public function initiateRemoteShare($circleUniqueId, $frameUniqueId) {
$args = [
'apiVersion' => Circles::version(),
'circleId' => $circleUniqueId,
'frameId' => $frameUniqueId
];
$client = $this->clientService->newClient();
try {
$client->post(
$this->generatePayloadDeliveryURL($this->serverHost), [
'body' => $args,
'timeout' => 10,
'connect_timeout' => 10,
]
);
// $result = json_decode($request->getBody(), true);
// $this->miscService->log(
// "initiateRemoteShare result: " . $uniqueId . ' ---- ' . var_export($result, true)
// );
return true;
} catch (Exception $e) {
throw $e;
}
}
/**
* @param SharingFrame $frame
*
* @throws Exception
*/
public function sendRemoteShare(SharingFrame $frame) {
$circle = $this->circlesRequest->forceGetCircle($frame->getCircleId());
if ($circle === null) {
throw new Exception('unknown_circle');
}
$links = $this->getLinksFromCircle($frame->getCircleId());
foreach ($links AS $link) {
$args = [
'apiVersion' => Circles::version(),
'token' => $link->getToken(true),
'uniqueId' => $circle->getUniqueId(true),
'item' => json_encode($frame)
];
$client = $this->clientService->newClient();
try {
$request = $client->put(
$this->generatePayloadDeliveryURL($link->getAddress()), [
'body' => $args,
'timeout' => 10,
'connect_timeout' => 10,
]
);
$result = json_decode($request->getBody(), true);
if ($result['status'] === -1) {
throw new PayloadDeliveryException($result['reason']);
}
} catch (Exception $e) {
$this->miscService->log(
'Issue while sending sharing frame to ' . $link->getAddress() . ' - '
. $e->getMessage()
);
}
}
}
/**
* generateHeaders()
*
* Generate new headers for the current Payload, and save them in the SharingFrame.
*
* @param SharingFrame $frame
*/
public function updateFrameWithCloudId(SharingFrame $frame) {
$frame->setCloudId($this->serverHost);
$this->circlesRequest->updateFrame($frame);
}
}
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