21803190065

Committed 08 Feb 2026 06:31PM UTC coverage: 47.755%. First build

Build # 21803190065

Build Type

Pull #6779

github

Committed by

web-flow

Commit Message

Merge 728f1f2b7 into e846efc09

Pull Request Pull Request #6779: feat: external cert metadata matching

Run Details

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53.82

/lib/Service/SignFileService.php

<?php

declare(strict_types=1);
/**
 * SPDX-FileCopyrightText: 2020-2024 LibreCode coop and contributors
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace OCA\Libresign\Service;

use DateTime;
use DateTimeInterface;
use Exception;
use InvalidArgumentException;
use OC\AppFramework\Http as AppFrameworkHttp;
use OC\User\NoUserException;
use OCA\Libresign\AppInfo\Application;
use OCA\Libresign\BackgroundJob\SignSingleFileJob;
use OCA\Libresign\DataObjects\VisibleElementAssoc;
use OCA\Libresign\Db\File as FileEntity;
use OCA\Libresign\Db\FileElement;
use OCA\Libresign\Db\FileElementMapper;
use OCA\Libresign\Db\FileMapper;
use OCA\Libresign\Db\IdDocs;
use OCA\Libresign\Db\IdDocsMapper;
use OCA\Libresign\Db\IdentifyMethod;
use OCA\Libresign\Db\IdentifyMethodMapper;
use OCA\Libresign\Db\SignRequest as SignRequestEntity;
use OCA\Libresign\Db\SignRequestMapper;
use OCA\Libresign\Db\UserElementMapper;
use OCA\Libresign\Enum\FileStatus;
use OCA\Libresign\Events\SignedEventFactory;
use OCA\Libresign\Exception\LibresignException;
use OCA\Libresign\Handler\DocMdpHandler;
use OCA\Libresign\Handler\FooterHandler;
use OCA\Libresign\Handler\PdfTk\Pdf;
use OCA\Libresign\Handler\SignEngine\Pkcs12Handler;
use OCA\Libresign\Handler\SignEngine\SignEngineFactory;
use OCA\Libresign\Handler\SignEngine\SignEngineHandler;
use OCA\Libresign\Helper\JSActions;
use OCA\Libresign\Helper\ValidateHelper;
use OCA\Libresign\Service\Envelope\EnvelopeStatusDeterminer;
use OCA\Libresign\Service\IdentifyMethod\IIdentifyMethod;
use OCA\Libresign\Service\IdentifyMethod\SignatureMethod\IToken;
use OCA\Libresign\Service\SignRequest\StatusService;
use OCP\AppFramework\Db\DoesNotExistException;
use OCP\AppFramework\Db\MultipleObjectsReturnedException;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\BackgroundJob\IJobList;
use OCP\EventDispatcher\IEventDispatcher;
use OCP\Files\File;
use OCP\Files\IRootFolder;
use OCP\Files\NotPermittedException;
use OCP\Http\Client\IClientService;
use OCP\IAppConfig;
use OCP\IDateTimeZone;
use OCP\IL10N;
use OCP\ITempManager;
use OCP\IURLGenerator;
use OCP\IUser;
use OCP\IUserSession;
use OCP\Security\ICredentialsManager;
use OCP\Security\ISecureRandom;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Sabre\DAV\UUIDUtil;

class SignFileService {
        private ?SignRequestEntity $signRequest = null;
        private string $password = '';
        private ?FileEntity $libreSignFile = null;
        /** @var array<int, VisibleElementAssoc> indexed by fileElementId */
        private $elements = [];
        private array $elementsInput = [];
        private bool $signWithoutPassword = false;
        private ?string $signatureMethodName = null;
        private ?File $fileToSign = null;
        private ?File $createdSignedFile = null;
        private string $userUniqueIdentifier = '';
        private string $friendlyName = '';
        private ?IUser $user = null;
        private ?SignEngineHandler $engine = null;

        public function __construct(
                protected IL10N $l10n,
                private FileMapper $fileMapper,
                private SignRequestMapper $signRequestMapper,
                private IdDocsMapper $idDocsMapper,
                private FooterHandler $footerHandler,
                protected FolderService $folderService,
                private IClientService $client,
                protected LoggerInterface $logger,
                private IAppConfig $appConfig,
                protected ValidateHelper $validateHelper,
                private SignerElementsService $signerElementsService,
                private IRootFolder $root,
                private IUserSession $userSession,
                private IDateTimeZone $dateTimeZone,
                private FileElementMapper $fileElementMapper,
                private UserElementMapper $userElementMapper,
                private IEventDispatcher $eventDispatcher,
                protected ISecureRandom $secureRandom,
                private IURLGenerator $urlGenerator,
                private IdentifyMethodMapper $identifyMethodMapper,
                private ITempManager $tempManager,
                private SigningCoordinatorService $signingCoordinatorService,
                private IdentifyMethodService $identifyMethodService,
                private ITimeFactory $timeFactory,
                protected SignEngineFactory $signEngineFactory,
                private SignedEventFactory $signedEventFactory,
                private Pdf $pdf,
                private DocMdpHandler $docMdpHandler,
                private PdfSignatureDetectionService $pdfSignatureDetectionService,
                private SequentialSigningService $sequentialSigningService,
                private FileStatusService $fileStatusService,
                private StatusService $statusService,
                private IJobList $jobList,
                private ICredentialsManager $credentialsManager,
                private EnvelopeStatusDeterminer $envelopeStatusDeterminer,
                private TsaValidationService $tsaValidationService,
                private PfxProvider $pfxProvider,
        ) {
        }

        /**
         * Can delete sing request
         */
        public function canDeleteRequestSignature(array $data): void {
                if (!empty($data['uuid'])) {
                        $signatures = $this->signRequestMapper->getByFileUuid($data['uuid']);
                } elseif (!empty($data['file']['fileId'])) {
                        $signatures = $this->signRequestMapper->getByNodeId($data['file']['fileId']);
                } else {
                        throw new \Exception($this->l10n->t('Please provide either UUID or File object'));
                }
                $signed = array_filter($signatures, fn ($s) => $s->getSigned());
                if ($signed) {
                        throw new \Exception($this->l10n->t('Document already signed'));
                }
                array_walk($data['users'], function ($user) use ($signatures): void {
                        $exists = array_filter($signatures, function (SignRequestEntity $signRequest) use ($user) {
                                $identifyMethod = $this->identifyMethodService->getIdentifiedMethod($signRequest->getId());
                                if ($identifyMethod->getName() === 'email') {
                                        return $identifyMethod->getEntity()->getIdentifierValue() === $user['email'];
                                }
                                return false;
                        });
                        if (!$exists) {
                                throw new \Exception($this->l10n->t('No signature was requested to %s', $user['email']));
                        }
                });
        }

        public function notifyCallback(File $file): void {
                $uri = $this->libreSignFile->getCallback();
                if (!$uri) {
                        $uri = $this->appConfig->getValueString(Application::APP_ID, 'webhook_sign_url');
                        if (!$uri) {
                                return;
                        }
                }
                $options = [
                        'multipart' => [
                                [
                                        'name' => 'uuid',
                                        'contents' => $this->libreSignFile->getUuid(),
                                ],
                                [
                                        'name' => 'status',
                                        'contents' => $this->libreSignFile->getStatus(),
                                ],
                                [
                                        'name' => 'file',
                                        'contents' => $file->fopen('r'),
                                        'filename' => $file->getName()
                                ]
                        ]
                ];
                $this->client->newClient()->post($uri, $options);
        }

        /**
         * @return static
         */
        public function setLibreSignFile(FileEntity $libreSignFile): self {
                $this->libreSignFile = $libreSignFile;
                return $this;
        }

        public function setUserUniqueIdentifier(string $identifier): self {
                $this->userUniqueIdentifier = $identifier;
                return $this;
        }

        public function setFriendlyName(string $friendlyName): self {
                $this->friendlyName = $friendlyName;
                return $this;
        }

        /**
         * @return static
         */
        public function setSignRequest(SignRequestEntity $signRequest): self {
                $this->signRequest = $signRequest;
                return $this;
        }

        /**
         * @return static
         */
        public function setSignWithoutPassword(bool $signWithoutPassword = true): self {
                $this->signWithoutPassword = $signWithoutPassword;
                return $this;
        }

        public function setSignatureMethod(?string $signatureMethodName): self {
                $this->signatureMethodName = $signatureMethodName;
                return $this;
        }

        /**
         * @return static
         */
        public function setPassword(?string $password = null): self {
                $this->password = $password;
                return $this;
        }

        public function setCurrentUser(?IUser $user): self {
                $this->user = $user;
                return $this;
        }

        public function prepareForSigning(
                FileEntity $libreSignFile,
                SignRequestEntity $signRequest,
                ?IUser $user,
                string $userIdentifier,
                string $displayName,
                bool $signWithoutPassword,
                ?string $password = null,
                ?string $signatureMethodName = null,
        ): self {
                if ($signWithoutPassword) {
                        $this->setSignWithoutPassword();
                } else {
                        $this->setPassword($password);
                }

                return $this
                        ->setLibreSignFile($libreSignFile)
                        ->setSignRequest($signRequest)
                        ->setCurrentUser($user)
                        ->setUserUniqueIdentifier($userIdentifier)
                        ->setFriendlyName($displayName)
                        ->setSignatureMethod($signatureMethodName);
        }

        public function setVisibleElements(array $list): self {
                $this->elementsInput = $list;
                if (!$this->signRequest instanceof SignRequestEntity) {
                        return $this;
                }
                $fileId = $this->signRequest->getFileId();
                $signRequestId = $this->signRequest->getId();

                if (empty($list) && ($fileId === null || $signRequestId === null)) {
                        return $this;
                }

                if ($fileId === null || $signRequestId === null) {
                        throw new LibresignException($this->l10n->t('File not found'));
                }

                $fileElements = $this->fileElementMapper->getByFileIdAndSignRequestId($fileId, $signRequestId);
                $canCreateSignature = $this->signerElementsService->canCreateSignature();
                $newElements = [];

                foreach ($fileElements as $fileElement) {
                        $fileElementId = $fileElement->getId();
                        if (!$canCreateSignature) {
                                $newElements[$fileElementId] = new VisibleElementAssoc($fileElement);
                                continue;
                        }
                        $element = $this->array_find($list, fn (array $element): bool => ($element['documentElementId'] ?? '') === $fileElementId);
                        if (!$element) {
                                continue;
                        }
                        $nodeId = $this->getNodeId($element, $fileElement);

                        $existing = $this->elements[$fileElementId] ?? null;
                        if ($existing instanceof VisibleElementAssoc && $this->isTempFileValid($existing)) {
                                $newElements[$fileElementId] = $existing;
                                continue;
                        }

                        $newElements[$fileElementId] = $this->bindFileElementWithTempFile($fileElement, $nodeId);
                }

                $this->elements = $newElements;

                return $this;
        }

        private function isTempFileValid(VisibleElementAssoc $elementAssoc): bool {
                $tempFile = $elementAssoc->getTempFile();
                return $tempFile !== '' && is_file($tempFile);
        }

        private function getNodeId(?array $element, FileElement $fileElement): int {
                if ($this->isValidElement($element)) {
                        return (int)$element['profileNodeId'];
                }

                return $this->retrieveUserElement($fileElement);
        }

        private function isValidElement(?array $element): bool {
                if (is_array($element) && !empty($element['profileNodeId']) && is_int($element['profileNodeId'])) {
                        return true;
                }
                $this->logger->error('Invalid data provided for signing file.', ['element' => $element]);
                throw new LibresignException($this->l10n->t('Invalid data to sign file'), 1);
        }

        private function retrieveUserElement(FileElement $fileElement): int {
                try {
                        if (!$this->user instanceof IUser) {
                                throw new Exception('User not set');
                        }
                        $userElement = $this->userElementMapper->findOne([
                                'user_id' => $this->user->getUID(),
                                'type' => $fileElement->getType(),
                        ]);
                } catch (MultipleObjectsReturnedException|DoesNotExistException|Exception) {
                        throw new LibresignException($this->l10n->t('You need to define a visible signature or initials to sign this document.'));
                }
                return $userElement->getNodeId();
        }

        private function bindFileElementWithTempFile(FileElement $fileElement, int $nodeId): VisibleElementAssoc {
                try {
                        $node = $this->getNode($nodeId);
                        if (!$node) {
                                throw new \Exception('Node content is empty or unavailable.');
                        }
                } catch (\Throwable) {
                        throw new LibresignException($this->l10n->t('You need to define a visible signature or initials to sign this document.'));
                }

                $tempFile = $this->tempManager->getTemporaryFile('_' . $nodeId . '.png');
                $content = $node->getContent();
                if (empty($content)) {
                        $this->logger->error('Failed to retrieve content for node.', ['nodeId' => $nodeId, 'fileElement' => $fileElement]);
                        throw new LibresignException($this->l10n->t('You need to define a visible signature or initials to sign this document.'));
                }
                file_put_contents($tempFile, $content);
                return new VisibleElementAssoc($fileElement, $tempFile);
        }

        private function getNode(int $nodeId): ?File {
                try {
                        return $this->folderService->getFileByNodeId($nodeId);
                } catch (\Throwable) {
                        $filesOfElementes = $this->signerElementsService->getElementsFromSession();
                        return $this->array_find($filesOfElementes, fn ($file) => $file->getId() === $nodeId);
                }
        }

        /**
         * Fallback to PHP < 8.4
         *
         * Reference: https://www.php.net/manual/en/function.array-find.php#130257
         *
         * @todo remove this after minor PHP version is >= 8.4
         * @deprecated This method will be removed once the minimum PHP version is >= 8.4. Use native array_find instead.
         */
        private function array_find(array $array, callable $callback): mixed {
                foreach ($array as $key => $value) {
                        if ($callback($value, $key)) {
                                return $value;
                        }
                }

                return null;
        }

        public function getVisibleElements(): array {
                return $this->elements;
        }

        public function getJobArgumentsWithoutCredentials(): array {
                $args = [];

                if (!empty($this->userUniqueIdentifier)) {
                        $args['userUniqueIdentifier'] = $this->userUniqueIdentifier;
                }

                if (!empty($this->friendlyName)) {
                        $args['friendlyName'] = $this->friendlyName;
                }

                if (!empty($this->elements)) {
                        $args['visibleElements'] = $this->elements;
                }

                if ($this->signRequest instanceof SignRequestEntity && $this->signRequest->getMetadata()) {
                        $args['metadata'] = $this->signRequest->getMetadata();
                }

                if ($this->user instanceof IUser) {
                        $args['userId'] = $this->user->getUID();
                }

                return $args;
        }

        public function validateSigningRequirements(): void {
                $this->tsaValidationService->validateConfiguration();
        }

        public function sign(): void {
                $signRequests = $this->getSignRequestsToSign();

                if (empty($signRequests)) {
                        throw new LibresignException('No sign requests found to process');
                }

                $this->executeSigningStrategy($signRequests);
        }

        private function executeSigningStrategy(array $signRequests): ?DateTimeInterface {
                if ($this->signingCoordinatorService->shouldUseParallelProcessing(count($signRequests))) {
                        return $this->processParallelSigning($signRequests);
                }
                return $this->signSequentially($signRequests);
        }

        private function processParallelSigning(array $signRequests): ?DateTimeInterface {
                $this->enqueueParallelSigningJobs($signRequests, $this->getJobArgumentsWithoutCredentials());
                return $this->getLatestSignedDate($signRequests);
        }

        private function getLatestSignedDate(array $signRequests): ?DateTimeInterface {
                $latestSignedDate = null;

                foreach ($signRequests as $signRequestData) {
                        try {
                                $signRequest = $this->signRequestMapper->getById($signRequestData['signRequest']->getId());
                                if ($signRequest->getSigned()) {
                                        $latestSignedDate = $signRequest->getSigned();
                                }
                        } catch (DoesNotExistException) {
                        }
                }

                return $latestSignedDate;
        }

        public function signSingleFile(FileEntity $libreSignFile, SignRequestEntity $signRequest): void {
                $previousState = $this->saveCachedState();
                $this->resetCachedState();

                if ($libreSignFile->getSignedHash()) {
                        $this->restoreCachedState($previousState);
                        return;
                }

                $previousLibreSignFile = $this->libreSignFile;
                $previousSignRequest = $this->signRequest;
                $this->libreSignFile = $libreSignFile;
                $this->signRequest = $signRequest;
                $this->setVisibleElements($this->elementsInput);

                try {
                        $this->validateDocMdpAllowsSignatures();

                        try {
                                $signedFile = $this->getEngine()->sign();
                        } catch (LibresignException|Exception $e) {
                                $this->cleanupUnsignedSignedFile();
                                $this->recordSignatureAttempt($e);
                                throw $e;
                        }

                        $hash = $this->computeHash($signedFile);
                        $this->updateSignRequest($hash);
                        $this->updateLibreSignFile($libreSignFile, $signedFile->getId(), $hash);

                        $this->dispatchSignedEvent();

                        $envelopeContext = $this->getEnvelopeContext();
                        if ($envelopeContext['envelope'] instanceof FileEntity) {
                                $this->updateEnvelopeStatus(
                                        $envelopeContext['envelope'],
                                        $envelopeContext['envelopeSignRequest'] ?? null,
                                        $signRequest->getSigned()
                                );
                        }
                } finally {
                        $this->libreSignFile = $previousLibreSignFile;
                        $this->signRequest = $previousSignRequest;
                        $this->restoreCachedState($previousState);
                }
        }

        private function saveCachedState(): array {
                return [
                        'fileToSign' => $this->fileToSign,
                        'createdSignedFile' => $this->createdSignedFile,
                        'engine' => $this->engine,
                ];
        }

        private function resetCachedState(): void {
                $this->fileToSign = null;
                $this->createdSignedFile = null;
                $this->engine = null;
        }

        private function restoreCachedState(array $state): void {
                $this->fileToSign = $state['fileToSign'];
                $this->createdSignedFile = $state['createdSignedFile'];
                $this->engine = $state['engine'];
        }

        public function enqueueParallelSigningJobs(array $signRequests, array $jobArguments = []): int {

                if (empty($signRequests)) {
                        throw new LibresignException('No sign requests found to process');
                }

                $enqueued = 0;
                foreach ($signRequests as $signRequestData) {
                        $file = $signRequestData['file'];
                        $signRequest = $signRequestData['signRequest'];

                        if ($file->getSignedHash()) {
                                continue;
                        }

                        $nodeId = $file->getNodeId();
                        $userId = $file->getUserId() ?? $signRequest->getUserId();

                        if ($nodeId === null || !$this->verifyFileExists($userId, $nodeId)) {
                                continue;
                        }

                        $this->enqueueSigningJobForFile($signRequest, $file, $jobArguments);
                        $enqueued++;
                }

                return $enqueued;
        }

        private function enqueueSigningJobForFile(SignRequestEntity $signRequest, FileEntity $file, array $jobArguments): void {
                $args = $jobArguments;
                $args = $this->addCredentialsToJobArgs($args, $signRequest, $file);
                $args = array_merge($args, [
                        'fileId' => $file->getId(),
                        'signRequestId' => $signRequest->getId(),
                        'signRequestUuid' => $signRequest->getUuid(),
                        'userId' => $file->getUserId(),
                        'isExternalSigner' => !str_starts_with($args['userUniqueIdentifier'] ?? '', 'account:'),
                ]);

                $this->jobList->add(SignSingleFileJob::class, $args);
        }

        private function addCredentialsToJobArgs(array $args, SignRequestEntity $signRequest, FileEntity $file): array {
                if (!($this->signWithoutPassword || !empty($this->password))) {
                        return $args;
                }

                $credentialsId = 'libresign_sign_' . $signRequest->getId() . '_' . $file->getId() . '_' . $this->secureRandom->generate(8, ISecureRandom::CHAR_ALPHANUMERIC);
                $this->credentialsManager->store(
                        $this->user?->getUID() ?? '',
                        $credentialsId,
                        [
                                'signWithoutPassword' => $this->signWithoutPassword,
                                'password' => $this->password,
                                'timestamp' => time(),
                                'expires' => time() + 3600,
                        ]
                );
                $args['credentialsId'] = $credentialsId;

                return $args;
        }

        /**
         * @return DateTimeInterface|null Last signed date
         */
        private function signSequentially(array $signRequests): ?DateTimeInterface {
                $envelopeLastSignedDate = null;
                $envelopeContext = $this->getEnvelopeContext();

                foreach ($signRequests as $index => $signRequestData) {
                        $this->libreSignFile = $signRequestData['file'];
                        if ($this->libreSignFile->getStatus() === FileStatus::SIGNED->value) {
                                continue;
                        }
                        $this->signRequest = $signRequestData['signRequest'];
                        $this->engine = null;
                        $this->setVisibleElements($this->elementsInput);
                        $this->fileToSign = null;

                        $this->validateDocMdpAllowsSignatures();

                        try {
                                $signedFile = $this->getEngine()->sign();
                        } catch (LibresignException|Exception $e) {
                                $this->cleanupUnsignedSignedFile();
                                $this->recordSignatureAttempt($e);

                                $isEnvelope = $this->libreSignFile->isEnvelope() || $this->libreSignFile->hasParent();
                                if (!$isEnvelope) {
                                        throw $e;
                                }
                                continue;
                        }

                        $hash = $this->computeHash($signedFile);
                        $envelopeLastSignedDate = $this->getEngine()->getLastSignedDate();

                        $this->updateSignRequest($hash);
                        $this->updateLibreSignFile($this->libreSignFile, $signedFile->getId(), $hash);

                        $this->dispatchSignedEvent();
                }

                if ($envelopeContext['envelope'] instanceof FileEntity) {
                        $this->updateEnvelopeStatus(
                                $envelopeContext['envelope'],
                                $envelopeContext['envelopeSignRequest'] ?? null,
                                $envelopeLastSignedDate
                        );
                }

                return $envelopeLastSignedDate;
        }

        /**
         * @return array Array of sign request data with 'file' => FileEntity, 'signRequest' => SignRequestEntity
         */
        private function getSignRequestsToSign(): array {
                if (!$this->libreSignFile->isEnvelope()
                        && !$this->libreSignFile->hasParent()
                ) {
                        return [[
                                'file' => $this->libreSignFile,
                                'signRequest' => $this->signRequest,
                        ]];
                }

                return $this->buildEnvelopeSignRequests();
        }

        /**
         * @return array Array of sign request data with 'file' => FileEntity, 'signRequest' => SignRequestEntity
         */
        private function buildEnvelopeSignRequests(): array {
                $envelopeId = $this->libreSignFile->isEnvelope()
                        ? $this->libreSignFile->getId()
                        : $this->libreSignFile->getParentFileId();

                $childFiles = $this->fileMapper->getChildrenFiles($envelopeId);
                if (empty($childFiles)) {
                        throw new LibresignException('No files found in envelope');
                }

                $childSignRequests = $this->signRequestMapper->getByEnvelopeChildrenAndIdentifyMethod(
                        $envelopeId,
                        $this->signRequest->getId()
                );

                if (empty($childSignRequests)) {
                        throw new LibresignException('No sign requests found for envelope files');
                }

                $signRequestsData = [];
                foreach ($childSignRequests as $childSignRequest) {
                        $childFile = $this->array_find(
                                $childFiles,
                                fn (FileEntity $file) => $file->getId() === $childSignRequest->getFileId()
                        );

                        if ($childFile) {
                                $signRequestsData[] = [
                                        'file' => $childFile,
                                        'signRequest' => $childSignRequest,
                                ];
                        }
                }

                return $signRequestsData;
        }

        /**
         * @return array Array with 'envelope' => FileEntity or null, 'envelopeSignRequest' => SignRequestEntity or null
         */
        private function getEnvelopeContext(): array {
                $result = [
                        'envelope' => null,
                        'envelopeSignRequest' => null,
                ];

                if (!$this->libreSignFile->isEnvelope() && !$this->libreSignFile->hasParent()) {
                        return $result;
                }

                if ($this->libreSignFile->isEnvelope()) {
                        $result['envelope'] = $this->libreSignFile;
                        $result['envelopeSignRequest'] = $this->signRequest;
                        return $result;
                }

                try {
                        $envelopeId = $this->libreSignFile->isEnvelope()
                                ? $this->libreSignFile->getId()
                                : $this->libreSignFile->getParentFileId();
                        $result['envelope'] = $this->fileMapper->getById($envelopeId);
                        $identifyMethod = $this->identifyMethodService->getIdentifiedMethod($this->signRequest->getId());
                        $result['envelopeSignRequest'] = $this->signRequestMapper->getByIdentifyMethodAndFileId(
                                $identifyMethod,
                                $result['envelope']->getId()
                        );
                } catch (DoesNotExistException $e) {
                }

                return $result;
        }

        private function updateEnvelopeStatus(
                FileEntity $envelope,
                ?SignRequestEntity $envelopeSignRequest = null,
                ?DateTimeInterface $signedDate = null,
        ): void {
                $childFiles = $this->fileMapper->getChildrenFiles($envelope->getId());
                $signRequestsMap = $this->buildSignRequestsMap($childFiles);

                $status = $this->envelopeStatusDeterminer->determineStatus($childFiles, $signRequestsMap);
                $envelope->setStatus($status);

                $this->handleSignedEnvelopeSignRequest($envelope, $envelopeSignRequest, $signedDate, $status);

                $this->updateEnvelopeMetadata($envelope);
                $this->fileMapper->update($envelope);
                $this->updateEntityCacheAfterDbSave($envelope);
        }

        private function buildSignRequestsMap(array $childFiles): array {
                $signRequestsMap = [];
                foreach ($childFiles as $childFile) {
                        $signRequestsMap[$childFile->getId()] = $this->signRequestMapper->getByFileId($childFile->getId());
                }
                return $signRequestsMap;
        }

        private function handleSignedEnvelopeSignRequest(
                FileEntity $envelope,
                ?SignRequestEntity $envelopeSignRequest,
                ?DateTimeInterface $signedDate,
                int $status,
        ): void {
                if (!($envelopeSignRequest instanceof SignRequestEntity)) {
                        return;
                }

                $envelopeSignRequest->setSigned($signedDate ?: new DateTime());
                $envelopeSignRequest->setStatusEnum(\OCA\Libresign\Enum\SignRequestStatus::SIGNED);
                $this->signRequestMapper->update($envelopeSignRequest);
                $this->sequentialSigningService
                        ->setFile($envelope)
                        ->releaseNextOrder(
                                $envelopeSignRequest->getFileId(),
                                $envelopeSignRequest->getSigningOrder()
                        );
        }

        private function updateEnvelopeMetadata(FileEntity $envelope): void {
                $meta = $envelope->getMetadata() ?? [];
                $meta['status_changed_at'] = (new DateTime())->format(DateTimeInterface::ATOM);
                $envelope->setMetadata($meta);
        }

        /**
         * @throws LibresignException If the document has DocMDP level 1 (no changes allowed)
         */
        protected function validateDocMdpAllowsSignatures(): void {
                $docmdpLevel = $this->libreSignFile->getDocmdpLevelEnum();

                if ($docmdpLevel === \OCA\Libresign\Enum\DocMdpLevel::CERTIFIED_NO_CHANGES_ALLOWED) {
                        throw new LibresignException(
                                $this->l10n->t('This document has been certified with no changes allowed. You cannot add more signers to this document.'),
                                AppFrameworkHttp::STATUS_UNPROCESSABLE_ENTITY
                        );
                }

                if ($docmdpLevel === \OCA\Libresign\Enum\DocMdpLevel::NOT_CERTIFIED) {
                        $resource = $this->getLibreSignFileAsResource();

                        try {
                                if (!$this->docMdpHandler->allowsAdditionalSignatures($resource)) {
                                        throw new LibresignException(
                                                $this->l10n->t('This document has been certified with no changes allowed. You cannot add more signers to this document.'),
                                                AppFrameworkHttp::STATUS_UNPROCESSABLE_ENTITY
                                        );
                                }
                        } finally {
                                fclose($resource);
                        }
                }
        }

        /**
         * @return resource
         * @throws LibresignException
         */
        protected function getLibreSignFileAsResource() {
                $files = $this->getNextcloudFiles($this->libreSignFile);
                if (empty($files)) {
                        throw new LibresignException('File not found');
                }
                $fileToSign = current($files);
                $content = $fileToSign->getContent();
                $resource = fopen('php://memory', 'r+');
                if ($resource === false) {
                        throw new LibresignException('Failed to create temporary resource for PDF validation');
                }
                fwrite($resource, $content);
                rewind($resource);
                return $resource;
        }

        protected function computeHash(File $file): string {
                return hash('sha256', $file->getContent());
        }

        protected function updateSignRequest(string $hash): void {
                $lastSignedDate = $this->getEngine()->getLastSignedDate();
                $this->signRequest->setSigned($lastSignedDate);
                $this->signRequest->setSignedHash($hash);
                $this->signRequest->setStatusEnum(\OCA\Libresign\Enum\SignRequestStatus::SIGNED);

                $certificateInfo = $this->getEngine()->readCertificate();
                $this->storeCertificateInfoInMetadata($certificateInfo);

                $this->signRequestMapper->update($this->signRequest);

                $this->sequentialSigningService
                        ->setFile($this->libreSignFile)
                        ->releaseNextOrder(
                                $this->signRequest->getFileId(),
                                $this->signRequest->getSigningOrder()
                        );
        }

        private function storeCertificateInfoInMetadata(array $certificateInfo): void {
                $metadata = $this->signRequest->getMetadata() ?? [];

                $certificateData = [];

                if (isset($certificateInfo['serialNumber'])) {
                        $certificateData['serialNumber'] = $certificateInfo['serialNumber'];
                }
                if (isset($certificateInfo['serialNumberHex'])) {
                        $certificateData['serialNumberHex'] = $certificateInfo['serialNumberHex'];
                }
                if (isset($certificateInfo['hash'])) {
                        $certificateData['hash'] = $certificateInfo['hash'];
                }
                if (isset($certificateInfo['subject'])) {
                        $certificateData['subject'] = $certificateInfo['subject'];
                }

                if (!empty($certificateData)) {
                        $metadata['certificate_info'] = $certificateData;
                        $this->signRequest->setMetadata($metadata);
                }
        }

        protected function updateLibreSignFile(FileEntity $libreSignFile, int $nodeId, string $hash): void {
                $libreSignFile->setSignedNodeId($nodeId);
                $libreSignFile->setSignedHash($hash);
                $this->setNewStatusIfNecessary($libreSignFile);
                $this->fileStatusService->update($libreSignFile);

                if ($libreSignFile->hasParent()) {
                        $this->fileStatusService->propagateStatusToParent($libreSignFile->getParentFileId());
                }
        }

        protected function dispatchSignedEvent(): void {
                $certificateSerialNumber = null;
                if ($this->signWithoutPassword) {
                        try {
                                $certificateInfo = $this->getEngine()->readCertificate();
                                if (isset($certificateInfo['serialNumber']) && is_string($certificateInfo['serialNumber'])) {
                                        $certificateSerialNumber = $certificateInfo['serialNumber'];
                                } else {
                                        $this->logger->warning('Unable to extract certificate serial number for event payload');
                                }
                        } catch (\Throwable $e) {
                                $this->logger->error('Failed to get certificate info for event', [
                                        'exception' => $e,
                                        'signRequestId' => $this->signRequest->getId()
                                ]);
                        }
                }

                $event = $this->signedEventFactory->make(
                        $this->signRequest,
                        $this->libreSignFile,
                        $this->getEngine()->getInputFile(),
                        $this->signWithoutPassword,
                        $certificateSerialNumber,
                );
                $this->eventDispatcher->dispatchTyped($event);
        }

        protected function identifyEngine(File $file): SignEngineHandler {
                return $this->signEngineFactory->resolve($file->getExtension());
        }

        protected function getSignatureParams(): array {
                $certificateData = $this->readCertificate();
                $signatureParams = $this->buildBaseSignatureParams($certificateData);
                $signatureParams = $this->addEmailToSignatureParams($signatureParams, $certificateData);
                $signatureParams = $this->addMetadataToSignatureParams($signatureParams);
                return $signatureParams;
        }

        private function buildBaseSignatureParams(array $certificateData): array {
                return [
                        'DocumentUUID' => $this->libreSignFile?->getUuid(),
                        'IssuerCommonName' => $certificateData['issuer']['CN'] ?? '',
                        'SignerCommonName' => $certificateData['subject']['CN'] ?? '',
                        'LocalSignerTimezone' => $this->dateTimeZone->getTimeZone()->getName(),
                        'LocalSignerSignatureDateTime' => (new DateTime('now', new \DateTimeZone('UTC')))
                                ->format(DateTimeInterface::ATOM)
                ];
        }

        private function addEmailToSignatureParams(array $signatureParams, array $certificateData): array {
                if (isset($certificateData['extensions']['subjectAltName'])) {
                        preg_match('/(?:email:)+(?<email>[^\s,]+)/', $certificateData['extensions']['subjectAltName'], $matches);
                        if ($matches && filter_var($matches['email'], FILTER_VALIDATE_EMAIL)) {
                                $signatureParams['SignerEmail'] = $matches['email'];
                        } elseif (filter_var($certificateData['extensions']['subjectAltName'], FILTER_VALIDATE_EMAIL)) {
                                $signatureParams['SignerEmail'] = $certificateData['extensions']['subjectAltName'];
                        }
                }
                if (empty($signatureParams['SignerEmail']) && $this->user instanceof IUser) {
                        $signatureParams['SignerEmail'] = $this->user->getEMailAddress();
                }
                if (empty($signatureParams['SignerEmail']) && $this->signRequest instanceof SignRequestEntity) {
                        $identifyMethod = $this->identifyMethodService->getIdentifiedMethod($this->signRequest->getId());
                        if ($identifyMethod->getName() === IdentifyMethodService::IDENTIFY_EMAIL) {
                                $signatureParams['SignerEmail'] = $identifyMethod->getEntity()->getIdentifierValue();
                        }
                }
                return $signatureParams;
        }

        private function addMetadataToSignatureParams(array $signatureParams): array {
                $signRequestMetadata = $this->signRequest->getMetadata();
                if (isset($signRequestMetadata['remote-address'])) {
                        $signatureParams['SignerIP'] = $signRequestMetadata['remote-address'];
                }
                if (isset($signRequestMetadata['user-agent'])) {
                        $signatureParams['SignerUserAgent'] = $signRequestMetadata['user-agent'];
                }
                return $signatureParams;
        }

        public function storeUserMetadata(array $metadata = []): self {
                $collectMetadata = $this->appConfig->getValueBool(Application::APP_ID, 'collect_metadata', false);
                if (!$collectMetadata || !$metadata) {
                        return $this;
                }
                $this->signRequest->setMetadata(array_merge(
                        $this->signRequest->getMetadata() ?? [],
                        $metadata,
                ));
                $this->signRequestMapper->update($this->signRequest);
                return $this;
        }

        /**
         * @return SignRequestEntity[]
         */
        protected function getSigners(): array {
                return $this->signRequestMapper->getByFileId($this->signRequest->getFileId());
        }

        protected function setNewStatusIfNecessary(FileEntity $libreSignFile): bool {
                $newStatus = $this->evaluateStatusFromSigners();

                if ($newStatus === null || $newStatus === $libreSignFile->getStatus()) {
                        return false;
                }

                $libreSignFile->setStatus($newStatus);

                return true;
        }

        private function updateEntityCacheAfterDbSave(FileEntity $file): void {
                $this->statusService->cacheFileStatus($file);
        }

        private function evaluateStatusFromSigners(): ?int {
                $signers = $this->getSigners();

                $total = count($signers);

                if ($total === 0) {
                        return null;
                }

                $totalSigned = count(array_filter($signers, fn ($s) => $s->getSigned() !== null));

                if ($totalSigned === $total) {
                        return FileStatus::SIGNED->value;
                }

                if ($totalSigned > 0) {
                        return FileStatus::PARTIAL_SIGNED->value;
                }

                return null;
        }

        private function getOrGeneratePfxContent(SignEngineHandler $engine): string {
                $result = $this->pfxProvider->getOrGeneratePfx(
                        $engine,
                        $this->signWithoutPassword,
                        $this->signatureMethodName,
                        $this->userUniqueIdentifier,
                        $this->friendlyName,
                        $this->password,
                );
                if ($result['password'] !== null) {
                        $this->setPassword($result['password']);
                }
                return $result['pfx'];
        }

        protected function readCertificate(): array {
                return $this->getEngine()
                        ->readCertificate();
        }

        /**
         * Get file to sign
         *
         * @throws LibresignException
         */
        protected function getFileToSign(): File {
                if ($this->fileToSign instanceof File) {
                        return $this->fileToSign;
                }

                $userId = $this->libreSignFile->getUserId()
                        ?? $this->user?->getUID()
                        ?? ($this->signRequest?->getUserId() ?? null);
                $nodeId = $this->libreSignFile->getNodeId();

                if ($userId === null) {
                        throw new LibresignException($this->l10n->t('Invalid data to sign file'), 1);
                }

                try {
                        $originalFile = $this->getNodeByIdUsingUid($userId, $nodeId);
                } catch (\Throwable $e) {
                        $this->logger->error('[file-access] FAILED to find file - userId={userId} nodeId={nodeId} error={error}', [
                                'userId' => $userId,
                                'nodeId' => $nodeId,
                                'error' => $e->getMessage(),
                        ]);
                        throw $e;
                }

                if ($originalFile->getOwner()->getUID() !== $userId) {
                        $originalFile = $this->getNodeByIdUsingUid($originalFile->getOwner()->getUID(), $nodeId);
                }
                if ($this->isPdf($originalFile)) {
                        $this->fileToSign = $this->getPdfToSign($originalFile);
                } else {
                        $this->fileToSign = $originalFile;
                }
                return $this->fileToSign;
        }

        private function isPdf(File $file): bool {
                return strcasecmp($file->getExtension(), 'pdf') === 0;
        }

        protected function getEngine(): SignEngineHandler {
                if (!$this->engine) {
                        $originalFile = $this->getFileToSign();
                        $this->engine = $this->identifyEngine($originalFile);

                        $this->configureEngine();
                }
                return $this->engine;
        }

        private function configureEngine(): void {
                $this->engine
                        ->setInputFile($this->getFileToSign())
                        ->setCertificate($this->getOrGeneratePfxContent($this->engine))
                        ->setPassword($this->password);

                if ($this->engine::class === Pkcs12Handler::class) {
                        $this->engine
                                ->setVisibleElements($this->getVisibleElements())
                                ->setSignatureParams($this->getSignatureParams());
                }
        }

        public function getLibresignFile(?int $fileId, ?string $signRequestUuid = null): FileEntity {
                try {
                        if ($fileId) {
                                return $this->fileMapper->getById($fileId);
                        }

                        if ($signRequestUuid) {
                                $signRequest = $this->signRequestMapper->getByUuid($signRequestUuid);
                                return $this->fileMapper->getById($signRequest->getFileId());
                        }

                        throw new \Exception('Invalid arguments');

                } catch (DoesNotExistException) {
                        throw new LibresignException($this->l10n->t('File not found'), 1);
                }
        }

        public function renew(SignRequestEntity $signRequest, string $method): void {
                $identifyMethods = $this->identifyMethodService->getIdentifyMethodsFromSignRequestId($signRequest->getId());
                if (empty($identifyMethods[$method])) {
                        throw new LibresignException($this->l10n->t('Invalid identification method'));
                }

                $signRequest->setUuid(UUIDUtil::getUUID());
                $this->signRequestMapper->update($signRequest);

                array_map(function (IIdentifyMethod $identifyMethod): void {
                        $entity = $identifyMethod->getEntity();
                        $entity->setAttempts($entity->getAttempts() + 1);
                        $entity->setLastAttemptDate($this->timeFactory->getDateTime());
                        $identifyMethod->save();
                }, $identifyMethods[$method]);
        }

        public function requestCode(
                SignRequestEntity $signRequest,
                string $identifyMethodName,
                string $signMethodName,
                string $identify = '',
        ): void {
                $identifyMethods = $this->identifyMethodService->getIdentifyMethodsFromSignRequestId($signRequest->getId());
                if (empty($identifyMethods[$identifyMethodName])) {
                        throw new LibresignException($this->l10n->t('Invalid identification method'));
                }
                foreach ($identifyMethods[$identifyMethodName] as $identifyMethod) {
                        try {
                                $signatureMethod = $identifyMethod->getEmptyInstanceOfSignatureMethodByName($signMethodName);
                                $signatureMethod->setEntity($identifyMethod->getEntity());
                        } catch (InvalidArgumentException) {
                                continue;
                        }
                        /** @var IToken $signatureMethod */
                        $identifier = $identify ?: $identifyMethod->getEntity()->getIdentifierValue();
                        $signatureMethod->requestCode($identifier, $identifyMethod->getEntity()->getIdentifierKey());
                        return;
                }
                throw new LibresignException($this->l10n->t('Sending authorization code not enabled.'));
        }

        public function getSignRequestToSign(FileEntity $libresignFile, ?string $signRequestUuid, ?IUser $user): SignRequestEntity {
                $this->validateHelper->fileCanBeSigned($libresignFile);
                try {
                        if ($libresignFile->isEnvelope()) {
                                $childFiles = $this->fileMapper->getChildrenFiles($libresignFile->getId());
                                $allSignRequests = [];
                                foreach ($childFiles as $childFile) {
                                        $childSignRequests = $this->signRequestMapper->getByFileId($childFile->getId());
                                        $allSignRequests = array_merge($allSignRequests, $childSignRequests);
                                }
                                $signRequests = $allSignRequests;
                        } else {
                                $signRequests = $this->signRequestMapper->getByFileId($libresignFile->getId());
                        }

                        if (!empty($signRequestUuid)) {
                                $signRequest = $this->getSignRequestByUuid($signRequestUuid);
                        } else {
                                $signRequest = array_reduce($signRequests, function (?SignRequestEntity $carry, SignRequestEntity $signRequest) use ($user): ?SignRequestEntity {
                                        $identifyMethods = $this->identifyMethodMapper->getIdentifyMethodsFromSignRequestId($signRequest->getId());
                                        $found = array_filter($identifyMethods, function (IdentifyMethod $identifyMethod) use ($user) {
                                                if ($identifyMethod->getIdentifierKey() === IdentifyMethodService::IDENTIFY_EMAIL
                                                        && $user
                                                        && (
                                                                $identifyMethod->getIdentifierValue() === $user->getUID()
                                                                || $identifyMethod->getIdentifierValue() === $user->getEMailAddress()
                                                        )
                                                ) {
                                                        return true;
                                                }
                                                if ($identifyMethod->getIdentifierKey() === IdentifyMethodService::IDENTIFY_ACCOUNT
                                                        && $user
                                                        && $identifyMethod->getIdentifierValue() === $user->getUID()
                                                ) {
                                                        return true;
                                                }
                                                return false;
                                        });
                                        if (count($found) > 0) {
                                                return $signRequest;
                                        }
                                        return $carry;
                                });
                        }

                        if (!$signRequest) {
                                throw new DoesNotExistException('Sign request not found');
                        }
                        $signRequestFile = $libresignFile;
                        if ($signRequestFile->getId() !== $signRequest->getFileId()) {
                                $signRequestFile = $this->fileMapper->getById($signRequest->getFileId());
                        }
                        $this->sequentialSigningService->setFile($signRequestFile);
                        if (
                                $this->sequentialSigningService->isOrderedNumericFlow()
                                && $this->sequentialSigningService->hasPendingLowerOrderSigners(
                                        $signRequest->getFileId(),
                                        $signRequest->getSigningOrder()
                                )
                        ) {
                                throw new LibresignException(json_encode([
                                        'action' => JSActions::ACTION_DO_NOTHING,
                                        'errors' => [['message' => $this->l10n->t('You are not allowed to sign this document yet')]],
                                ]));
                        }
                        if ($signRequest->getSigned()) {
                                throw new LibresignException($this->l10n->t('File already signed by you'), 1);
                        }
                        return $signRequest;
                } catch (DoesNotExistException) {
                        throw new LibresignException($this->l10n->t('Invalid data to sign file'), 1);
                }
        }

        protected function getPdfToSign(File $originalFile): File {
                $file = $this->getSignedFile();
                if ($file instanceof File) {
                        return $file;
                }

                $originalContent = $originalFile->getContent();

                if ($this->pdfSignatureDetectionService->hasSignatures($originalContent)) {
                        return $this->createSignedFile($originalFile, $originalContent);
                }
                $metadata = $this->footerHandler->getMetadata($originalFile, $this->libreSignFile);
                $footer = $this->footerHandler
                        ->setTemplateVar('uuid', $this->libreSignFile->getUuid())
                        ->setTemplateVar('signers', array_map(fn (SignRequestEntity $signer) => [
                                'displayName' => $signer->getDisplayName(),
                                'signed' => $signer->getSigned()
                                        ? $signer->getSigned()->format(DateTimeInterface::ATOM)
                                        : null,
                        ], $this->getSigners()))
                        ->getFooter($metadata['d']);
                if ($footer) {
                        $stamp = $this->tempManager->getTemporaryFile('stamp.pdf');
                        file_put_contents($stamp, $footer);

                        $input = $this->tempManager->getTemporaryFile('input.pdf');
                        file_put_contents($input, $originalContent);

                        try {
                                $pdfContent = $this->pdf->applyStamp($input, $stamp);
                        } catch (RuntimeException $e) {
                                throw new LibresignException($e->getMessage());
                        }
                } else {
                        $pdfContent = $originalContent;
                }
                return $this->createSignedFile($originalFile, $pdfContent);
        }

        protected function getSignedFile(): ?File {
                $nodeId = $this->libreSignFile->getSignedNodeId();
                if (!$nodeId) {
                        return null;
                }

                $fileToSign = $this->getNodeByIdUsingUid($this->libreSignFile->getUserId(), $nodeId);

                if ($fileToSign->getOwner()->getUID() !== $this->libreSignFile->getUserId()) {
                        $fileToSign = $this->getNodeByIdUsingUid($fileToSign->getOwner()->getUID(), $nodeId);
                }
                return $fileToSign;
        }

        protected function getNodeByIdUsingUid(string $uid, int $nodeId): File {
                try {
                        $userFolder = $this->root->getUserFolder($uid);
                } catch (NoUserException $e) {
                        $this->logger->error('[file-access] NoUserException for uid={uid}', ['uid' => $uid]);
                        throw new LibresignException($this->l10n->t('User not found.'));
                } catch (NotPermittedException $e) {
                        $this->logger->error('[file-access] NotPermittedException for uid={uid}', ['uid' => $uid]);
                        throw new LibresignException($this->l10n->t('You do not have permission for this action.'));
                }

                try {
                        $fileToSign = $userFolder->getFirstNodeById($nodeId);
                } catch (\Throwable $e) {
                        $this->logger->error('[file-access] Failed getFirstNodeById - nodeId={nodeId} error={error}', [
                                'nodeId' => $nodeId,
                                'error' => $e->getMessage(),
                        ]);
                        throw $e;
                }

                if (!$fileToSign instanceof File) {
                        $this->logger->error('[file-access] Node is not a File - nodeId={nodeId} type={type}', [
                                'nodeId' => $nodeId,
                                'type' => $fileToSign ? get_class($fileToSign) : 'NULL',
                        ]);
                        throw new LibresignException($this->l10n->t('File not found'));
                }
                return $fileToSign;
        }

        /**
         * Verify if file exists in filesystem before enqueuing background job
         *
         * @param string|null $uid User ID
         * @param int $nodeId File node ID
         * @return bool True if file exists and is accessible
         */
        private function verifyFileExists(?string $uid, int $nodeId): bool {
                if ($uid === null || $nodeId === 0) {
                        return false;
                }

                try {
                        $userFolder = $this->root->getUserFolder($uid);
                        $node = $userFolder->getFirstNodeById($nodeId);
                        return $node instanceof File;
                } catch (\Throwable $e) {
                        $this->logger->warning('[verify-file] File not accessible - nodeId={nodeId} uid={uid} error={error}', [
                                'nodeId' => $nodeId,
                                'uid' => $uid,
                                'error' => $e->getMessage(),
                        ]);
                        return false;
                }
        }

        private function cleanupUnsignedSignedFile(): void {
                if (!$this->createdSignedFile instanceof File) {
                        return;
                }

                try {
                        $this->createdSignedFile->delete();
                } catch (\Throwable $e) {
                        $this->logger->warning('Failed to delete temporary signed file: ' . $e->getMessage());
                } finally {
                        $this->createdSignedFile = null;
                }
        }

        private function createSignedFile(File $originalFile, string $content): File {
                $filename = preg_replace(
                        '/' . $originalFile->getExtension() . '$/',
                        $this->l10n->t('signed') . '.' . $originalFile->getExtension(),
                        basename($originalFile->getPath())
                );
                $owner = $originalFile->getOwner()->getUID();

                $fileId = $this->libreSignFile->getId();
                $extension = $originalFile->getExtension();
                $uniqueFilename = substr($filename, 0, -strlen($extension) - 1) . '_' . $fileId . '.' . $extension;

                try {
                        /** @var \OCP\Files\Folder */
                        $parentFolder = $this->root->getUserFolder($owner)->getFirstNodeById($originalFile->getParentId());

                        $this->createdSignedFile = $parentFolder->newFile($uniqueFilename, $content);

                        return $this->createdSignedFile;
                } catch (NotPermittedException) {
                        throw new LibresignException($this->l10n->t('You do not have permission for this action.'));
                } catch (\Exception $e) {
                        throw $e;
                }
        }

        /**
         * @throws DoesNotExistException
         */
        public function getSignRequestByUuid(string $uuid): SignRequestEntity {
                $this->validateHelper->validateUuidFormat($uuid);
                return $this->signRequestMapper->getByUuid($uuid);
        }

        /**
         * @throws DoesNotExistException
         */
        public function getFile(int $signRequestId): FileEntity {
                return $this->fileMapper->getById($signRequestId);
        }

        /**
         * @throws DoesNotExistException
         */
        public function getFileByUuid(string $uuid): FileEntity {
                return $this->fileMapper->getByUuid($uuid);
        }

        public function getIdDocById(int $fileId): IdDocs {
                return $this->idDocsMapper->getByFileId($fileId);
        }

        /**
         * @return File[] Array of files
         */
        public function getNextcloudFiles(FileEntity $fileData): array {
                if ($fileData->getNodeType() === 'envelope') {
                        $children = $this->fileMapper->getChildrenFiles($fileData->getId());
                        $files = [];
                        foreach ($children as $child) {
                                $nodeId = $child->getNodeId();
                                if ($nodeId === null) {
                                        throw new LibresignException(json_encode([
                                                'action' => JSActions::ACTION_DO_NOTHING,
                                                'errors' => [['message' => $this->l10n->t('File not found')]],
                                        ]), AppFrameworkHttp::STATUS_NOT_FOUND);
                                }
                                $file = $this->root->getUserFolder($child->getUserId())->getFirstNodeById($nodeId);
                                if ($file instanceof File) {
                                        $files[] = $file;
                                }
                        }
                        return $files;
                }

                $nodeId = $fileData->getNodeId();
                if ($nodeId === null) {
                        throw new LibresignException(json_encode([
                                'action' => JSActions::ACTION_DO_NOTHING,
                                'errors' => [['message' => $this->l10n->t('File not found')]],
                        ]), AppFrameworkHttp::STATUS_NOT_FOUND);
                }
                $fileToSign = $this->root->getUserFolder($fileData->getUserId())->getFirstNodeById($nodeId);
                if (!$fileToSign instanceof File) {
                        throw new LibresignException(json_encode([
                                'action' => JSActions::ACTION_DO_NOTHING,
                                'errors' => [['message' => $this->l10n->t('File not found')]],
                        ]), AppFrameworkHttp::STATUS_NOT_FOUND);
                }
                return [$fileToSign];
        }

        /**
         * @return array<FileEntity>
         */
        public function getNextcloudFilesWithEntities(FileEntity $fileData): array {
                if ($fileData->getNodeType() === 'envelope') {
                        $children = $this->fileMapper->getChildrenFiles($fileData->getId());
                        $result = [];
                        foreach ($children as $child) {
                                $nodeId = $child->getNodeId();
                                if ($nodeId === null) {
                                        throw new LibresignException(json_encode([
                                                'action' => JSActions::ACTION_DO_NOTHING,
                                                'errors' => [['message' => $this->l10n->t('File not found')]],
                                        ]), AppFrameworkHttp::STATUS_NOT_FOUND);
                                }
                                $file = $this->root->getUserFolder($child->getUserId())->getFirstNodeById($nodeId);
                                if ($file instanceof File) {
                                        $result[] = $child;
                                }
                        }
                        return $result;
                }

                $nodeId = $fileData->getNodeId();
                if ($nodeId === null) {
                        throw new LibresignException(json_encode([
                                'action' => JSActions::ACTION_DO_NOTHING,
                                'errors' => [['message' => $this->l10n->t('File not found')]],
                        ]), AppFrameworkHttp::STATUS_NOT_FOUND);
                }
                $fileToSign = $this->root->getUserFolder($fileData->getUserId())->getFirstNodeById($nodeId);
                if (!$fileToSign instanceof File) {
                        throw new LibresignException(json_encode([
                                'action' => JSActions::ACTION_DO_NOTHING,
                                'errors' => [['message' => $this->l10n->t('File not found')]],
                        ]), AppFrameworkHttp::STATUS_NOT_FOUND);
                }
                return [$fileData];
        }

        public function validateSigner(string $uuid, ?IUser $user = null): void {
                $this->validateHelper->validateSigner($uuid, $user);
        }

        public function validateRenewSigner(string $uuid, ?IUser $user = null): void {
                $this->validateHelper->validateRenewSigner($uuid, $user);
        }

        public function getSignerData(?IUser $user, ?SignRequestEntity $signRequest = null): array {
                $return = ['user' => ['name' => null]];
                if ($signRequest) {
                        $return['user']['name'] = $signRequest->getDisplayName();
                } elseif ($user) {
                        $return['user']['name'] = $user->getDisplayName();
                }
                return $return;
        }

        public function getAvailableIdentifyMethodsFromSettings(): array {
                $identifyMethods = $this->identifyMethodService->getIdentifyMethodsSettings();
                $return = array_map(fn (array $identifyMethod): array => [
                        'mandatory' => $identifyMethod['mandatory'],
                        'identifiedAtDate' => null,
                        'validateCode' => false,
                        'method' => $identifyMethod['name'],
                ], $identifyMethods);
                return $return;
        }

        public function getFileUrl(int $fileId, string $uuid): string {
                try {
                        $this->idDocsMapper->getByFileId($fileId);
                        return $this->urlGenerator->linkToRoute('libresign.page.getPdf', ['uuid' => $uuid]);
                } catch (DoesNotExistException) {
                        return $this->urlGenerator->linkToRoute('libresign.page.getPdfFile', ['uuid' => $uuid]);
                }
        }

        /**
         * Get PDF URLs for signing
         * For envelopes: returns URLs for all child files
         * For regular files: returns URL for the file itself
         *
         * @return string[]
         */
        public function getPdfUrlsForSigning(FileEntity $fileEntity, SignRequestEntity $signRequestEntity): array {
                if (!$fileEntity->isEnvelope()) {
                        return [
                                $this->getFileUrl($fileEntity->getId(), $signRequestEntity->getUuid())
                        ];
                }

                $childSignRequests = $this->signRequestMapper->getByEnvelopeChildrenAndIdentifyMethod(
                        $fileEntity->getId(),
                        $signRequestEntity->getId()
                );

                $pdfUrls = [];
                foreach ($childSignRequests as $childSignRequest) {
                        $pdfUrls[] = $this->getFileUrl(
                                $childSignRequest->getFileId(),
                                $childSignRequest->getUuid()
                        );
                }

                return $pdfUrls;
        }

        private function recordSignatureAttempt(Exception $exception): void {
                if (!$this->libreSignFile) {
                        return;
                }

                $metadata = $this->libreSignFile->getMetadata() ?? [];

                if (!isset($metadata['signature_attempts'])) {
                        $metadata['signature_attempts'] = [];
                }

                $attempt = [
                        'timestamp' => (new DateTime())->format(\DateTime::ATOM),
                        'engine' => $this->engine ? get_class($this->engine) : 'unknown',
                        'error_message' => $exception->getMessage(),
                        'error_code' => $exception->getCode(),
                ];

                $metadata['signature_attempts'][] = $attempt;
                $this->libreSignFile->setMetadata($metadata);
                $this->fileMapper->update($this->libreSignFile);
        }
}

LibreSign / libresign / 21803190065

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