public interfaces FullTextSearch

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>
-@return mixed

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>
Merge remote-tracking branch 'origin/interfaces-fulltextsearch-2' into interfaces-fulltextsearch-2

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>

16 files changed, 3871 insertions, 0 deletions

diff --git a/lib/public/FullTextSearch/Exceptions/FullTextSearchAppNotAvailableException.php b/lib/public/FullTextSearch/Exceptions/FullTextSearchAppNotAvailableException.php
new file mode 100644
index 00000000000..4363376f0f4
--- /dev/null
+++ b/lib/public/FullTextSearch/Exceptions/FullTextSearchAppNotAvailableException.php
@@ -0,0 +1,42 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018, Maxence Lange <maxence@artificial-owl.com>
+ * @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 OCP\FullTextSearch\Exceptions;
+
+/**
+ * @since 15.0.0
+ *
+ * Class FullTextSearchAppNotAvailableException
+ *
+ * @package OCP\FullTextSearch\Exceptions
+ */
+class FullTextSearchAppNotAvailableException extends \Exception {
+}
+
diff --git a/lib/public/FullTextSearch/IFullTextSearchManager.php b/lib/public/FullTextSearch/IFullTextSearchManager.php
new file mode 100644
index 00000000000..1027f7ade75
--- /dev/null
+++ b/lib/public/FullTextSearch/IFullTextSearchManager.php
@@ -0,0 +1,186 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018, Maxence Lange <maxence@artificial-owl.com>
+ * @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 OCP\FullTextSearch;
+
+
+use OCP\FullTextSearch\Model\IIndex;
+use OCP\FullTextSearch\Model\ISearchResult;
+use OCP\FullTextSearch\Service\IIndexService;
+use OCP\FullTextSearch\Service\IProviderService;
+use OCP\FullTextSearch\Service\ISearchService;
+
+
+/**
+ * Interface IFullTextSearchManager
+ *
+ * Should be used to manage FullTextSearch from the app that contains your
+ * Content Provider/Search Platform.
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch
+ */
+interface IFullTextSearchManager {
+
+
+	/**
+	 * Register a IProviderService.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IProviderService $providerService
+	 */
+	public function registerProviderService(IProviderService $providerService);
+
+	/**
+	 * Register a IIndexService.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndexService $indexService
+	 */
+	public function registerIndexService(IIndexService $indexService);
+
+	/**
+	 * Register a ISearchService.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param ISearchService $searchService
+	 */
+	public function registerSearchService(ISearchService $searchService);
+
+
+	/**
+	 * Add the Javascript API in the navigation page of an app.
+	 * Needed to replace the default search.
+	 *
+	 * @since 15.0.0
+	 */
+	public function addJavascriptAPI();
+
+
+	/**
+	 * Check if the provider $providerId is already indexed.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 *
+	 * @return bool
+	 */
+	public function isProviderIndexed(string $providerId): bool;
+
+
+	/**
+	 * Retrieve an Index from the database, based on the Id of the Provider
+	 * and the Id of the Document
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param string $documentId
+	 *
+	 * @return IIndex
+	 */
+	public function getIndex(string $providerId, string $documentId): IIndex;
+
+
+	/**
+	 * Create a new Index.
+	 *
+	 * This method must be called when a new document is created.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param string $documentId
+	 * @param string $userId
+	 * @param int $status
+	 *
+	 * @return IIndex
+	 */
+	public function createIndex(string $providerId, string $documentId, string $userId, int $status = 0): IIndex;
+
+
+	/**
+	 * Update the status of an Index. status is a bitflag, setting $reset to
+	 * true will reset the status to the value defined in the parameter.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param string $documentId
+	 * @param int $status
+	 * @param bool $reset
+	 */
+	public function updateIndexStatus(string $providerId, string $documentId, int $status, bool $reset = false);
+
+
+	/**
+	 * Update the status of an array of Index. status is a bit flag, setting $reset to
+	 * true will reset the status to the value defined in the parameter.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param array $documentIds
+	 * @param int $status
+	 * @param bool $reset
+	 */
+	public function updateIndexesStatus(string $providerId, array $documentIds, int $status, bool $reset = false);
+
+	/**
+	 * Update an array of Index.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndex[] $indexes
+	 */
+	public function updateIndexes(array $indexes);
+
+	/**
+	 * Search using an array as request. If $userId is empty, will use the
+	 * current session.
+	 *
+	 * @see ISearchService::generateSearchRequest
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $request
+	 * @param string $userId
+	 * @return ISearchResult[]
+	 */
+	public function search(array $request, string $userId = ''): array;
+
+
+}
+
diff --git a/lib/public/FullTextSearch/IFullTextSearchPlatform.php b/lib/public/FullTextSearch/IFullTextSearchPlatform.php
new file mode 100644
index 00000000000..f3f9a35bae2
--- /dev/null
+++ b/lib/public/FullTextSearch/IFullTextSearchPlatform.php
@@ -0,0 +1,227 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch;
+
+
+use OCP\FullTextSearch\Model\DocumentAccess;
+use OCP\FullTextSearch\Model\IIndex;
+use OCP\FullTextSearch\Model\IndexDocument;
+use OCP\FullTextSearch\Model\IRunner;
+use OCP\FullTextSearch\Model\ISearchResult;
+
+
+/**
+ * Interface IFullTextSearchPlatform
+ *
+ * This interface must be use when creating a Search Platform for FullTextSearch.
+ *
+ * A Search Platform is an extension to the FullTextSearch that will act as a
+ * a gateway between FullTextSearch and a search server (ie. ElasticSearch,
+ * Solr, ...)
+ *
+ * Multiple Search Platform can exist at the same time in Nextcloud, however only
+ * one Search Platform will be used by FullTextSearch.
+ * Administrator must select at least one Search Platform to be used by
+ * FullTextSearch in the admin settings page.
+ *
+ * The content provided by FullTextSearch comes in chunk from multiple Content
+ * Provider. Each chunk is identified by the ID of the Content Provider, and the
+ * ID of the document.
+ *
+ *
+ * To oversimplify the mechanism:
+ *
+ * - When indexing, FullTextSearch will send providerId, documentId, content.
+ * - When searching within the content of a Content Provider, identified by its
+ *   providerId, FullTextSearch expect documentId as result.
+ *
+ *
+ * The Search Platform ia a PHP class that implement this interface and is defined
+ * in appinfo/info.xml of the app that contains that class:
+ *
+ *    <fulltextsearch>
+ *      <platform>OCA\YourApp\YourSearchPlatform</platform>
+ *    </fulltextsearch>
+ *
+ * Multiple Search Platform can be defined in a single app.
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch
+ */
+interface IFullTextSearchPlatform {
+
+
+	/**
+	 * Must returns a unique Id used to identify the Search Platform.
+	 * Id must contains only alphanumeric chars, with no space.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getId(): string;
+
+
+	/**
+	 * Must returns a descriptive name of the Search Platform.
+	 * This is used mainly in the admin settings page to display the list of
+	 * available Search Platform
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getName(): string;
+
+
+	/**
+	 * should returns the current configuration of the Search Platform.
+	 * This is used to display the configuration when using the
+	 * ./occ fulltextsearch:check command line.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getConfiguration(): array;
+
+
+	/**
+	 * Set the wrapper of the currently executed process.
+	 * Because the index process can be long and heavy, and because errors can
+	 * be encountered during the process, the IRunner is a wrapper that allow the
+	 * Search Platform to communicate with the process initiated by
+	 * FullTextSearch.
+	 *
+	 * The IRunner is coming with some methods so the Search Platform can
+	 * returns important information and errors to be displayed to the admin.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IRunner $runner
+	 */
+	public function setRunner(IRunner $runner);
+
+
+	/**
+	 * Called when FullTextSearch is loading your Search Platform.
+	 *
+	 * @since 15.0.0
+	 */
+	public function loadPlatform();
+
+
+	/**
+	 * Called to check that your Search Platform is correctly configured and that
+	 * This is also the right place to check that the Search Service is available.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return bool
+	 */
+	public function testPlatform(): bool;
+
+
+	/**
+	 * Called before an index is initiated.
+	 * Best place to initiate some stuff on the Search Server (mapping, ...)
+	 *
+	 * @since 15.0.0
+	 */
+	public function initializeIndex();
+
+
+	/**
+	 * Reset the indexes for a specific providerId.
+	 * $providerId can be 'all' if it is a global reset.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 */
+	public function resetIndex(string $providerId);
+
+
+	/**
+	 * Deleting some IIndex, sent in an array
+	 *
+	 * @see IIndex
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndex[] $indexes
+	 */
+	public function deleteIndexes(array $indexes);
+
+
+	/**
+	 * Indexing a document.
+	 *
+	 * @see IndexDocument
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IndexDocument $document
+	 *
+	 * @return IIndex
+	 */
+	public function indexDocument(IndexDocument $document): IIndex;
+
+
+	/**
+	 * Searching documents, ISearchResult should be updated with the result of
+	 * the search.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param ISearchResult $result
+	 * @param DocumentAccess $access
+	 */
+	public function searchRequest(ISearchResult $result, DocumentAccess $access);
+
+
+	/**
+	 * Return a document based on its Id and the Provider.
+	 * This is used when an admin execute ./occ fulltextsearch:document:platform
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param string $documentId
+	 *
+	 * @return IndexDocument
+	 */
+	public function getDocument(string $providerId, string $documentId): IndexDocument;
+
+
+}
+
diff --git a/lib/public/FullTextSearch/IFullTextSearchProvider.php b/lib/public/FullTextSearch/IFullTextSearchProvider.php
new file mode 100644
index 00000000000..890b57d84c9
--- /dev/null
+++ b/lib/public/FullTextSearch/IFullTextSearchProvider.php
@@ -0,0 +1,304 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch;
+
+
+use OCP\FullTextSearch\Model\IIndex;
+use OCP\FullTextSearch\Model\IIndexOptions;
+use OCP\FullTextSearch\Model\IndexDocument;
+use OCP\FullTextSearch\Model\IRunner;
+use OCP\FullTextSearch\Model\ISearchRequest;
+use OCP\FullTextSearch\Model\ISearchResult;
+use OCP\FullTextSearch\Model\SearchTemplate;
+
+
+/**
+ * Interface IFullTextSearchProvider
+ *
+ * This interface must be use when creating a Content Provider for FullTextSearch.
+ *
+ * A Content Provider is an extension to the FullTextSearch that will extract and
+ * provide content to the FullTextSearch.
+ *
+ * There is no limit to the number of Content Provider that can be integrated to
+ * FullTextSearch. Each Content Provider corresponding to a type of content
+ * available in Nextcloud (files, bookmarks, notes, deck cards, mails, ...)
+ *
+ * Content is split in document identified by an ID and the ID of the Content
+ * Provider. The content is indexed by a Search Platform that will returns a
+ * documentId as a result on a search request.
+ *
+ *
+ * To oversimplify the mechanism:
+ *
+ * - When indexing, FullTextSearch will ask for documents to every Content Provider.
+ * - On search, results from the Search Platform, identified by documentId, will
+ *   be improved by each relative Content Provider.
+ *
+ *
+ * The Content Provider is a PHP class that implement this interface and is defined
+ * in appinfo/info.xml of the app that contains that class:
+ *
+ *    <fulltextsearch>
+ *      <provider>OCA\YourApp\YourContentProvider</provider>
+ *    </fulltextsearch>
+ *
+ * Multiple Content Provider can be defined in a single app.
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch
+ */
+interface IFullTextSearchProvider {
+
+
+	/**
+	 * Must returns a unique Id used to identify the Content Provider.
+	 * Id must contains only alphanumeric chars, with no space.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getId(): string;
+
+
+	/**
+	 * Must returns a descriptive name of the Content Provider.
+	 * This is used in multiple places, so better use a clear display name.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getName(): string;
+
+
+	/**
+	 * Should returns the current configuration of the Content Provider.
+	 * This is used to display the configuration when using the
+	 * ./occ fulltextsearch:check command line.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getConfiguration(): array;
+
+
+	/**
+	 * Must returns a SearchTemplate that contains displayable items and
+	 * available options to users when searching.
+	 *
+	 * @see SearchTemplate
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return SearchTemplate
+	 */
+	public function getSearchTemplate(): SearchTemplate;
+
+
+	/**
+	 * Called when FullTextSearch is loading your Content Provider.
+	 *
+	 * @since 15.0.0
+	 */
+	public function loadProvider();
+
+
+	/**
+	 * Set the wrapper of the currently executed process.
+	 * Because the index process can be long and heavy, and because errors can
+	 * be encountered during the process, the IRunner is a wrapper that allow the
+	 * Content Provider to communicate with the process initiated by
+	 * FullTextSearch.
+	 *
+	 * The IRunner is coming with some methods so the Content Provider can
+	 * returns important information and errors to be displayed to the admin.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IRunner $runner
+	 */
+	public function setRunner(IRunner $runner);
+
+
+	/**
+	 * This method is called when the administrator specify options when running
+	 * the ./occ fulltextsearch:index or ./occ fulltextsearch:live
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndexOptions $options
+	 */
+	public function setIndexOptions(IIndexOptions $options);
+
+
+	/**
+	 * Returns all indexable document for a user as an array of IndexDocument.
+	 *
+	 * There is no need to fill each IndexDocument with content; at this point,
+	 * only fill the object with the minimum information to not waste memory while
+	 * still being able to identify the document it is referring to.
+	 *
+	 * FullTextSearch will call 2 other methods of this interface for each
+	 * IndexDocument of the array, prior to their indexing:
+	 *
+	 * - first, to compare the date of the last index,
+	 * - then, to fill each IndexDocument with complete data
+	 *
+	 * @see IndexDocument
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $userId
+	 *
+	 * @return IndexDocument[]
+	 */
+	public function generateIndexableDocuments(string $userId): array;
+
+
+	/**
+	 * Called to verify that the document is not already indexed and that the
+	 * old index is not up-to-date, using the IIndex from
+	 * IndexDocument->getIndex()
+	 *
+	 * Returning true will not queue the current IndexDocument to any further
+	 * operation and will continue on the next element from the list returned by
+	 * generateIndexableDocuments().
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IndexDocument $document
+	 *
+	 * @return bool
+	 */
+	public function isDocumentUpToDate(IndexDocument $document): bool;
+
+
+	/**
+	 * Must fill IndexDocument with all information relative to the document,
+	 * before its indexing by the Search Platform.
+	 *
+	 * Method is called for each element returned previously by
+	 * generateIndexableDocuments().
+	 *
+	 * @see IndexDocument
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IndexDocument $document
+	 */
+	public function fillIndexDocument(IndexDocument $document);
+
+
+	/**
+	 * The Search Provider must create and return an IndexDocument
+	 * based on the IIndex and its status. The IndexDocument must contains all
+	 * information as it will be send for indexing.
+	 *
+	 * Method is called during a cron or a ./occ fulltextsearch:live after a
+	 * new document is created, or an old document is set as modified.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndex $index
+	 *
+	 * @return IndexDocument
+	 */
+	public function updateDocument(IIndex $index): IndexDocument;
+
+
+	/**
+	 * Called when an index is initiated by the administrator.
+	 * This is should only be used in case of a specific mapping is needed.
+	 * (ie. _almost_ never)
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IFullTextSearchPlatform $platform
+	 */
+	public function onInitializingIndex(IFullTextSearchPlatform $platform);
+
+
+	/**
+	 * Called when administrator is resetting the index.
+	 * This is should only be used in case of a specific mapping has been
+	 * created.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IFullTextSearchPlatform $platform
+	 */
+	public function onResettingIndex(IFullTextSearchPlatform $platform);
+
+
+	/**
+	 * Method is called when a search request is initiated by a user, prior to
+	 * be sent to the Search Platform.
+	 *
+	 * Your Content Provider can interact with the ISearchRequest to apply the
+	 * search options and make the search more precise.
+	 *
+	 * @see ISearchRequest
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param ISearchRequest $searchRequest
+	 */
+	public function improveSearchRequest(ISearchRequest $searchRequest);
+
+
+	/**
+	 * Method is called after results of a search are returned by the
+	 * Search Platform.
+	 *
+	 * Your Content Provider can detail each entry with local data to improve
+	 * the display of the search result.
+	 *
+	 * @see ISearchResult
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param ISearchResult $searchResult
+	 */
+	public function improveSearchResult(ISearchResult $searchResult);
+
+
+	/**
+	 * not used yet.
+	 *
+	 * @since 15.0.0
+	 */
+	public function unloadProvider();
+
+}
diff --git a/lib/public/FullTextSearch/Model/DocumentAccess.php b/lib/public/FullTextSearch/Model/DocumentAccess.php
new file mode 100644
index 00000000000..ef199fb7385
--- /dev/null
+++ b/lib/public/FullTextSearch/Model/DocumentAccess.php
@@ -0,0 +1,363 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch\Model;
+
+
+use JsonSerializable;
+
+
+/**
+ * Class DocumentAccess
+ *
+ * This object is used as a data transfer object when
+ *
+ * - indexing a document,
+ * - generating a search request.
+ *
+ * During the index, it is used to define which users, groups, circles, ...
+ * have access to the IndexDocument
+ *
+ * During the search, it is internally use to define to which group, circles, ...
+ * a user that perform the search belongs to.
+ *
+ * @see IndexDocument::setAccess
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch\Model
+ */
+final class DocumentAccess implements JsonSerializable {
+
+	/** @var string */
+	private $ownerId;
+
+	/** @var string */
+	private $viewerId = '';
+
+	/** @var array */
+	private $users = [];
+
+	/** @var array */
+	private $groups = [];
+
+	/** @var array */
+	private $circles = [];
+
+	/** @var array */
+	private $links = [];
+
+
+	/**
+	 * Owner of the document can be set at the init of the object.
+	 *
+	 * @since 15.0.0
+	 *
+	 * DocumentAccess constructor.
+	 *
+	 * @param string $ownerId
+	 */
+	public function __construct(string $ownerId = '') {
+		$this->setOwnerId($ownerId);
+	}
+
+
+	/**
+	 * Set the Owner of the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $ownerId
+	 *
+	 * @return DocumentAccess
+	 */
+	public function setOwnerId(string $ownerId) {
+		$this->ownerId = $ownerId;
+
+		return $this;
+	}
+
+	/**
+	 * Get the Owner of the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getOwnerId(): string {
+		return $this->ownerId;
+	}
+
+
+	/**
+	 * Set the viewer of the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $viewerId
+	 *
+	 * @return DocumentAccess
+	 */
+	public function setViewerId(string $viewerId): DocumentAccess {
+		$this->viewerId = $viewerId;
+
+		return $this;
+	}
+
+	/**
+	 * Get the viewer of the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getViewerId(): string {
+		return $this->viewerId;
+	}
+
+
+	/**
+	 * Set the list of users that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $users
+	 *
+	 * @return DocumentAccess
+	 */
+	public function setUsers(array $users): DocumentAccess {
+		$this->users = $users;
+
+		return $this;
+	}
+
+	/**
+	 * Add an entry to the list of users that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $user
+	 *
+	 * @return DocumentAccess
+	 */
+	public function addUser(string $user): DocumentAccess {
+		$this->users[] = $user;
+
+		return $this;
+	}
+
+	/**
+	 * Add multiple entries to the list of users that have read access to the
+	 * document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $users
+	 *
+	 * @return DocumentAccess
+	 */
+	public function addUsers($users): DocumentAccess {
+		$this->users = array_merge($this->users, $users);
+
+		return $this;
+	}
+
+	/**
+	 * Get the complete list of users that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getUsers(): array {
+		return $this->users;
+	}
+
+
+	/**
+	 * Set the list of groups that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $groups
+	 *
+	 * @return DocumentAccess
+	 */
+	public function setGroups(array $groups): DocumentAccess {
+		$this->groups = $groups;
+
+		return $this;
+	}
+
+	/**
+	 * Add an entry to the list of groups that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $group
+	 *
+	 * @return DocumentAccess
+	 */
+	public function addGroup(string $group): DocumentAccess {
+		$this->groups[] = $group;
+
+		return $this;
+	}
+
+	/**
+	 * Add multiple entries to the list of groups that have read access to the
+	 * document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $groups
+	 *
+	 * @return DocumentAccess
+	 */
+	public function addGroups(array $groups) {
+		$this->groups = array_merge($this->groups, $groups);
+
+		return $this;
+	}
+
+	/**
+	 * Get the complete list of groups that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getGroups(): array {
+		return $this->groups;
+	}
+
+
+	/**
+	 * Set the list of circles that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $circles
+	 *
+	 * @return DocumentAccess
+	 */
+	public function setCircles(array $circles): DocumentAccess {
+		$this->circles = $circles;
+
+		return $this;
+	}
+
+	/**
+	 * Add an entry to the list of circles that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $circle
+	 *
+	 * @return DocumentAccess
+	 */
+	public function addCircle(string $circle): DocumentAccess {
+		$this->circles[] = $circle;
+
+		return $this;
+	}
+
+	/**
+	 * Add multiple entries to the list of groups that have read access to the
+	 * document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $circles
+	 *
+	 * @return DocumentAccess
+	 */
+	public function addCircles(array $circles): DocumentAccess {
+		$this->circles = array_merge($this->circles, $circles);
+
+		return $this;
+	}
+
+	/**
+	 * Get the complete list of circles that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getCircles(): array {
+		return $this->circles;
+	}
+
+
+	/**
+	 * Set the list of links that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $links
+	 *
+	 * @return DocumentAccess
+	 */
+	public function setLinks(array $links): DocumentAccess {
+		$this->links = $links;
+
+		return $this;
+	}
+
+	/**
+	 * Get the list of links that have read access to the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getLinks(): array {
+		return $this->links;
+	}
+
+
+	/**
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function jsonSerialize(): array {
+		return [
+			'ownerId' => $this->getOwnerId(),
+			'viewerId' => $this->getViewerId(),
+			'users' => $this->getUsers(),
+			'groups' => $this->getGroups(),
+			'circles' => $this->getCircles(),
+			'links' => $this->getLinks()
+		];
+	}
+}
+
diff --git a/lib/public/FullTextSearch/Model/IIndex.php b/lib/public/FullTextSearch/Model/IIndex.php
new file mode 100644
index 00000000000..adfdf34aee6
--- /dev/null
+++ b/lib/public/FullTextSearch/Model/IIndex.php
@@ -0,0 +1,292 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for extcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch\Model;
+
+
+/**
+ * Interface IIndex
+ *
+ * Index are generated by FullTextSearch to manage the status of a document
+ * regarding the date of the last index and the date of the last modification
+ * of the original document.
+ *
+ * The uniqueness of an IndexDocument is made by the Id of the Content Provider
+ * and the Id of the original document within the Content Provider.
+ *
+ * We will call original document the source from which the IndexDocument is
+ * generated. As an example, an original document can be a file, a mail, ...
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch\Model
+ */
+interface IIndex {
+
+
+	const INDEX_OK = 1;
+	const INDEX_IGNORE = 2;
+
+	const INDEX_META = 4;
+	const INDEX_CONTENT = 8;
+	const INDEX_FULL = 12;
+	const INDEX_REMOVE = 16;
+
+	const INDEX_DONE = 32;
+	const INDEX_FAILED = 64;
+
+	const ERROR_FAILED = 1;
+	const ERROR_FAILED2 = 2;
+	const ERROR_FAILED3 = 4;
+
+	const ERROR_SEV_1 = 1;
+	const ERROR_SEV_2 = 2;
+	const ERROR_SEV_3 = 3;
+	const ERROR_SEV_4 = 4;
+
+
+	/**
+	 * Get the Id of the Content Provider.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getProviderId(): string;
+
+
+	/**
+	 * Get the Id of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getDocumentId(): string;
+
+
+	/**
+	 * Set the source of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $source
+	 *
+	 * @return IIndex
+	 */
+	public function setSource(string $source): IIndex;
+
+	/**
+	 * Get the source of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getSource(): string;
+
+
+	/**
+	 * Set the owner of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $ownerId
+	 *
+	 * @return IIndex
+	 */
+	public function setOwnerId(string $ownerId): IIndex;
+
+	/**
+	 * Get the owner of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getOwnerId(): string;
+
+
+	/**
+	 * Set the current index status (bit flag) of the original document.
+	 * If $reset is true, the status is reset to the defined value.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param int $status
+	 * @param bool $reset
+	 *
+	 * @return IIndex
+	 */
+	public function setStatus(int $status, bool $reset = false): IIndex;
+
+	/**
+	 * Get the current index status of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return int
+	 */
+	public function getStatus(): int;
+
+	/**
+	 * Check if the document fit a specific status.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param int $status
+	 *
+	 * @return bool
+	 */
+	public function isStatus(int $status): bool;
+
+	/**
+	 * Remove a status.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param int $status
+	 *
+	 * @return IIndex
+	 */
+	public function unsetStatus(int $status): IIndex;
+
+
+	/**
+	 * Add an option related to the original document (as string).
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $option
+	 * @param string|int $value
+	 *
+	 * @return IIndex
+	 */
+	public function addOption(string $option, string $value): IIndex;
+
+	/**
+	 * Add an option related to the original document (as integer).
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $option
+	 * @param int $value
+	 *
+	 * @return IIndex
+	 */
+	public function addOptionInt(string $option, int $value): IIndex;
+
+	/**
+	 * Get the option related to the original document (as string).
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $option
+	 * @param string $default
+	 *
+	 * @return string
+	 */
+	public function getOption(string $option, string $default = ''): string;
+
+	/**
+	 * Get the option related to the original document (as integer).
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $option
+	 * @param int $default
+	 *
+	 * @return int
+	 */
+	public function getOptionInt(string $option, int $default = 0): int;
+
+	/**
+	 * Get all options related to the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getOptions(): array;
+
+
+	/**
+	 * Add an error log related to the Index.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $message
+	 * @param string $exception
+	 * @param int $sev
+	 *
+	 * @return IIndex
+	 */
+	public function addError(string $message, string $exception = '', int $sev = self::ERROR_SEV_3): IIndex;
+
+	/**
+	 * Returns the number of known errors related to the Index.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return int
+	 */
+	public function getErrorCount(): int;
+
+	/**
+	 * Reset all error logs related to the Index.
+	 *
+	 * @since 15.0.0
+	 */
+	public function resetErrors(): IIndex;
+
+
+	/**
+	 * Set the date of the last index.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param int $lastIndex
+	 *
+	 * @return IIndex
+	 */
+	public function setLastIndex(int $lastIndex = -1): IIndex;
+
+	/**
+	 * Get the date of the last index.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return int
+	 */
+	public function getLastIndex(): int;
+
+
+}
+
diff --git a/lib/public/FullTextSearch/Model/IIndexOptions.php b/lib/public/FullTextSearch/Model/IIndexOptions.php
new file mode 100644
index 00000000000..8cc5da13d4d
--- /dev/null
+++ b/lib/public/FullTextSearch/Model/IIndexOptions.php
@@ -0,0 +1,86 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch\Model;
+
+
+/**
+ * Interface IIndexOptions
+ *
+ * IndexOptions are created in FullTextSearch when an admin initiate an index
+ * from the command line:
+ *
+ * ./occ fulltextsearch:index "{\"option1\": \"value\", \"option2\": true}"
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch\Model
+ */
+interface IIndexOptions {
+
+
+	/**
+	 * Get the value (as a string) for an option.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $option
+	 * @param string $default
+	 *
+	 * @return string
+	 */
+	public function getOption(string $option, string $default = ''): string;
+
+	/**
+	 * Get the value (as an array) for an option.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $option
+	 * @param array $default
+	 *
+	 * @return array
+	 */
+	public function getOptionArray(string $option, array $default = []): array;
+
+	/**
+	 * Get the value (as an boolean) for an option.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $option
+	 * @param bool $default
+	 *
+	 * @return bool
+	 */
+	public function getOptionBool(string $option, bool $default): bool;
+
+}
+
diff --git a/lib/public/FullTextSearch/Model/IRunner.php b/lib/public/FullTextSearch/Model/IRunner.php
new file mode 100644
index 00000000000..0dff82bd5a0
--- /dev/null
+++ b/lib/public/FullTextSearch/Model/IRunner.php
@@ -0,0 +1,142 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch\Model;
+
+
+/**
+ * Interface IRunner
+ *
+ * The indexing process can be long and heavy, and because errors can
+ * be encountered the process is wrapped using this interface.
+ * It allows the any extension of FullTextSearch to communicate with the process.
+ *
+ * The IRunner is coming with some methods so the Search Platform can
+ * returns important information and errors to be displayed to the admin.
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch\Model
+ */
+interface IRunner {
+
+
+	const RESULT_TYPE_SUCCESS = 1;
+	const RESULT_TYPE_WARNING = 4;
+	const RESULT_TYPE_FAIL = 9;
+
+
+	/**
+	 * Info are displayed in the user interface when an admin execute the
+	 * ./occ fulltextsearch:index command.
+	 *
+	 * quick list of info that can be edited:
+	 *   'documentId', 'info', 'title', 'resultIndex', 'resultStatus',
+	 *   'content', 'documentCurrent', 'documentTotal', 'progressStatus',
+	 *   'errorCurrent', 'errorException', 'errorIndex'.
+	 *
+	 * List of all editable info can be find in the Command\Index.php of the
+	 * FullTextSearch app.
+	 * (look for a comment 'full list of info that can be edited')
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $info
+	 * @param string $value
+	 */
+	public function setInfo(string $info, string $value);
+
+
+	/**
+	 * This method should be used when editing multiple info to avoid too many
+	 * refresh of the interface.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $data
+	 */
+	public function setInfoArray(array $data);
+
+
+	/**
+	 * Method used to update the current Action when an index is running.
+	 *
+	 * This method should be used instead of manually update the 'action' using
+	 * setInfo()/setInfoArray() as it is also used to keep the process alive,
+	 * manage the input, and some statistics of the load of the process.
+	 *
+	 * $action is a string with no space
+	 * $force should be set to true if the action is heavy while being executed
+	 * multiple times
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $action
+	 * @param bool $force
+	 *
+	 * @return string
+	 * @throws \Exception
+	 */
+	public function updateAction(string $action = '', bool $force = false): string;
+
+
+	/**
+	 * Call this method in a Search Platform or Content Provider if there is an
+	 * issue while generating a document or while indexing the current document.
+	 * This is used to store and display errors in the UI during an index to help
+	 * admin to keep track of errors.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndex $index
+	 * @param string $message
+	 * @param string $class
+	 * @param int $sev
+	 */
+	public function newIndexError(IIndex $index, string $message, string $class = '', int $sev = 3);
+
+
+	/**
+	 * Call this method only in a Search Platform after an index of a document.
+	 * This is used to store and display results (good or bad) in the UI during
+	 * an index to help admin to keep track of fail and successful indexes.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndex $index
+	 * @param string $message
+	 * @param string $status
+	 * @param int $type
+	 */
+	public function newIndexResult(IIndex $index, string $message, string $status, int $type);
+
+
+}
+
diff --git a/lib/public/FullTextSearch/Model/ISearchRequest.php b/lib/public/FullTextSearch/Model/ISearchRequest.php
new file mode 100644
index 00000000000..073b4805f63
--- /dev/null
+++ b/lib/public/FullTextSearch/Model/ISearchRequest.php
@@ -0,0 +1,326 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch\Model;
+
+
+/**
+ * Interface ISearchRequest
+ *
+ * When a search request is initiated, from a request from the front-end or using
+ * the IFullTextSearchManager::search() method, FullTextSearch will create a
+ * SearchRequest object, based on this interface.
+ *
+ * The object will be passed to the targeted Content Provider so it can convert
+ * search options using available method.
+ *
+ * The object is then encapsulated in a SearchResult and send to the
+ * Search Platform.
+ *
+ * @since 15.0.0
+ *
+ *
+ * @package OCP\FullTextSearch\Model
+ */
+interface ISearchRequest {
+
+
+	/**
+	 * Get the maximum number of results to be returns by the Search Platform.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return int
+	 */
+	public function getSize(): int;
+
+
+	/**
+	 * Get the current page.
+	 * Used by pagination.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return int
+	 */
+	public function getPage(): int;
+
+
+	/**
+	 * Get the author of the request.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getAuthor(): string;
+
+	/**
+	 * Get the searched string.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getSearch(): string;
+
+
+	/**
+	 * Get the value of an option (as string).
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $option
+	 * @param string $default
+	 *
+	 * @return string
+	 */
+	public function getOption(string $option, string $default = ''): string;
+
+	/**
+	 * Get the value of an option (as array).
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $option
+	 * @param array $default
+	 *
+	 * @return array
+	 */
+	public function getOptionArray(string $option, array $default = []): array;
+
+
+	/**
+	 * Limit the search to a part of the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $part
+	 *
+	 * @return ISearchRequest
+	 */
+	public function addPart(string $part): ISearchRequest;
+
+	/**
+	 * Limit the search to an array of parts of the document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $parts
+	 *
+	 * @return ISearchRequest
+	 */
+	public function setParts(array $parts): ISearchRequest;
+
+	/**
+	 * Get the parts the search is limited to.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getParts(): array;
+
+
+	/**
+	 * Limit the search to a specific meta tag.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $tag
+	 *
+	 * @return ISearchRequest
+	 */
+	public function addMetaTag(string $tag): ISearchRequest;
+
+	/**
+	 * Get the meta tags the search is limited to.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getMetaTags(): array;
+
+	/**
+	 * Limit the search to an array of meta tags.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $tags
+	 *
+	 * @return ISearchRequest
+	 */
+	public function setMetaTags(array $tags): IsearchRequest;
+
+
+	/**
+	 * Limit the search to a specific sub tag.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $source
+	 * @param string $tag
+	 *
+	 * @return ISearchRequest
+	 */
+	public function addSubTag(string $source, string $tag): ISearchRequest;
+
+	/**
+	 * Get the sub tags the search is limited to.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param bool $formatted
+	 *
+	 * @return array
+	 */
+	public function getSubTags(bool $formatted): array;
+
+	/**
+	 * Limit the search to an array of sub tags.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $tags
+	 *
+	 * @return ISearchRequest
+	 */
+	public function setSubTags(array $tags): ISearchRequest;
+
+
+	/**
+	 * Limit the search to a specific field of the mapping, using a full string.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $field
+	 *
+	 * @return ISearchRequest
+	 */
+	public function addLimitField(string $field): ISearchRequest;
+
+	/**
+	 * Get the fields the search is limited to.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getLimitFields(): array;
+
+
+	/**
+	 * Limit the search to a specific field of the mapping, using a wildcard on
+	 * the search string.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $field
+	 *
+	 * @return ISearchRequest
+	 */
+	public function addWildcardField(string $field): ISearchRequest;
+
+	/**
+	 * Get the limit to field of the mapping.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getWildcardFields(): array;
+
+
+	/**
+	 * Filter the results, based on a group of field, using regex
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $filters
+	 *
+	 * @return ISearchRequest
+	 */
+	public function addRegexFilters(array $filters): ISearchRequest;
+
+	/**
+	 * Get the regex filters the search is limit to.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getRegexFilters(): array;
+
+
+	/**
+	 * Filter the results, based on a group of field, using wildcard
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $filter
+	 *
+	 * @return ISearchRequest
+	 */
+	public function addWildcardFilter(array $filter): ISearchRequest;
+
+	/**
+	 * Get the wildcard filters the search is limit to.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getWildcardFilters(): array;
+
+
+	/**
+	 * Add an extra field to the search.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $field
+	 *
+	 * @return ISearchRequest
+	 */
+	public function addField(string $field): ISearchRequest;
+
+	/**
+	 * Get the list of extra field to search into.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getFields(): array;
+
+
+}
+
diff --git a/lib/public/FullTextSearch/Model/ISearchResult.php b/lib/public/FullTextSearch/Model/ISearchResult.php
new file mode 100644
index 00000000000..a7dcba82f5c
--- /dev/null
+++ b/lib/public/FullTextSearch/Model/ISearchResult.php
@@ -0,0 +1,198 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch\Model;
+
+
+use OCP\FullTextSearch\IFullTextSearchProvider;
+
+
+/**
+ * Interface ISearchResult
+ *
+ * When a search request is initiated, FullTextSearch will create a SearchResult
+ * object, based on this interface, containing the SearchRequest and the targeted
+ * Content Provider.
+ *
+ * The object will be passed to the Search Platform, which will proceed to the
+ * search and fill the SearchResult object with results.
+ *
+ * Then, the object will be passed to the targeted Content Provider that will
+ * improve the Search Results with detailed informations.
+ *
+ * Finally, the SearchResult is returned to the original search request.
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch\Model
+ */
+interface ISearchResult {
+
+
+	/**
+	 * Get the original SearchRequest.
+	 *
+	 * @see ISearchRequest
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return ISearchRequest
+	 */
+	public function getRequest(): ISearchRequest;
+
+	/**
+	 * Get the targeted Content Provider.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return IFullTextSearchProvider
+	 */
+	public function getProvider(): IFullTextSearchProvider;
+
+
+	/**
+	 * Add an IndexDocument as one of the result of the search request.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IndexDocument $document
+	 *
+	 * @return ISearchResult
+	 */
+	public function addDocument(IndexDocument $document): ISearchResult;
+
+	/**
+	 * Returns all result of the search request, in an array of IndexDocument.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getDocuments(): array;
+
+	/**
+	 * Set an array of IndexDocument as the result of the search request.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IndexDocument[] $documents
+	 *
+	 * @return ISearchResult
+	 */
+	public function setDocuments(array $documents): ISearchResult;
+
+
+	/**
+	 * Add an aggregation to the result.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $category
+	 * @param string $value
+	 * @param int $count
+	 *
+	 * @return ISearchResult
+	 */
+	public function addAggregation(string $category, string $value, int $count): ISearchResult;
+
+	/**
+	 * Get all aggregations.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $category
+	 *
+	 * @return array
+	 */
+	public function getAggregations(string $category): array;
+
+
+	/**
+	 * Set the raw result of the request.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $result
+	 *
+	 * @return ISearchResult
+	 */
+	public function setRawResult(string $result): ISearchResult;
+
+
+	/**
+	 * Set the total number of results for the search request.
+	 * Used by pagination.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param int $total
+	 *
+	 * @return ISearchResult
+	 */
+	public function setTotal(int $total): ISearchResult;
+
+
+	/**
+	 * Set the top score for the search request.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param int $score
+	 *
+	 * @return ISearchResult
+	 */
+	public function setMaxScore(int $score): ISearchResult;
+
+
+	/**
+	 * Set the time spent by the request to perform the search.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param int $time
+	 *
+	 * @return ISearchResult
+	 */
+	public function setTime(int $time): ISearchResult;
+
+
+	/**
+	 * Set to true if the request timed out.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param bool $timedOut
+	 *
+	 * @return ISearchResult
+	 */
+	public function setTimedOut(bool $timedOut): ISearchResult;
+
+}
+
diff --git a/lib/public/FullTextSearch/Model/IndexDocument.php b/lib/public/FullTextSearch/Model/IndexDocument.php
new file mode 100644
index 00000000000..a73b702e506
--- /dev/null
+++ b/lib/public/FullTextSearch/Model/IndexDocument.php
@@ -0,0 +1,898 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch\Model;
+
+
+use JsonSerializable;
+
+/**
+ * Class IndexDocument
+ *
+ * This is one of the main class of the FullTextSearch, used as a data transfer
+ * object. An IndexDocument is created to manage documents around FullTextSearch,
+ * during an index and during a search.
+ * The uniqueness of an IndexDocument is made by the Id of the Content Provider
+ * and the Id of the original document within the Content Provider.
+ *
+ * We will call original document the source from which the IndexDocument is
+ * generated. As an example, an original document can be a file, a mail, ...
+ *
+ * @since 15.0.0
+ *
+ * @package OC\FullTextSearch\Model
+ */
+class IndexDocument implements JsonSerializable {
+
+
+	const NOT_ENCODED = 0;
+	const ENCODED_BASE64 = 1;
+
+
+	/** @var string */
+	protected $id;
+
+	/** @var string */
+	protected $providerId;
+
+	/** @var DocumentAccess */
+	protected $access;
+
+	/** @var IIndex */
+	protected $index;
+
+	/** @var int */
+	protected $modifiedTime = 0;
+
+	/** @var string */
+	protected $source = '';
+
+	/** @var array */
+	protected $tags = [];
+
+	/** @var array */
+	protected $metaTags = [];
+
+	/** @var array */
+	protected $subTags = [];
+
+	/** @var string */
+	protected $title = '';
+
+	/** @var string */
+	protected $content = '';
+
+	/** @var string */
+	protected $hash = '';
+
+	/** @var array */
+	protected $parts = [];
+
+	/** @var string */
+	protected $link = '';
+
+	/** @var array */
+	protected $more = [];
+
+	/** @var array */
+	protected $excerpts = [];
+
+	/** @var string */
+	protected $score = '';
+
+	/** @var array */
+	protected $info = [];
+
+	/** @var int */
+	protected $contentEncoded;
+
+
+	/**
+	 * IndexDocument constructor.
+	 *
+	 * On creation, we assure the uniqueness of the object using the providerId
+	 * and the Id of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param string $documentId
+	 */
+	public function __construct(string $providerId, string $documentId) {
+		$this->providerId = $providerId;
+		$this->id = $documentId;
+	}
+
+
+	/**
+	 * Returns the Id of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	final public function getId(): string {
+		return $this->id;
+	}
+
+
+	/**
+	 * Returns the Id of the provider.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	final public function getProviderId(): string {
+		return $this->providerId;
+	}
+
+
+	/**
+	 * Set the Index related to the IndexDocument.
+	 *
+	 * @see IIndex
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndex $index
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setIndex(IIndex $index): IndexDocument {
+		$this->index = $index;
+
+		return $this;
+	}
+
+	/**
+	 * Get the Index.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return IIndex
+	 */
+	final public function getIndex(): IIndex {
+		return $this->index;
+	}
+
+
+	/**
+	 * Set the modified time of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param int $modifiedTime
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setModifiedTime(int $modifiedTime): IndexDocument {
+		$this->modifiedTime = $modifiedTime;
+
+		return $this;
+	}
+
+	/**
+	 * Get the modified time of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return int
+	 */
+	final public function getModifiedTime(): int {
+		return $this->modifiedTime;
+	}
+
+	/**
+	 * Check if the original document of the IndexDocument is older than $time.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param int $time
+	 *
+	 * @return bool
+	 */
+	final public function isOlderThan(int $time): bool {
+		return ($this->modifiedTime < $time);
+	}
+
+
+	/**
+	 * Set the read rights of the original document using a DocumentAccess.
+	 *
+	 * @see DocumentAccess
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param DocumentAccess $access
+	 *
+	 * @return $this
+	 */
+	final public function setAccess(DocumentAccess $access) {
+		$this->access = $access;
+
+		return $this;
+	}
+
+	/**
+	 * Get the DocumentAccess related to the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return DocumentAccess
+	 */
+	final public function getAccess(): DocumentAccess {
+		return $this->access;
+	}
+
+
+	/**
+	 * Add a tag to the list.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $tag
+	 *
+	 * @return IndexDocument
+	 */
+	final public function addTag(string $tag): IndexDocument {
+		$this->tags[] = $tag;
+
+		return $this;
+	}
+
+	/**
+	 * Set the list of tags assigned to the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $tags
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setTags(array $tags): IndexDocument {
+		$this->tags = $tags;
+
+		return $this;
+	}
+
+	/**
+	 * Get the list of tags assigned to the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	final public function getTags(): array {
+		return $this->tags;
+	}
+
+
+	/**
+	 * Add a meta tag to the list.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $tag
+	 *
+	 * @return IndexDocument
+	 */
+	final public function addMetaTag(string $tag): IndexDocument {
+		$this->metaTags[] = $tag;
+
+		return $this;
+	}
+
+	/**
+	 * Set the list of meta tags assigned to the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $tags
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setMetaTags(array $tags): IndexDocument {
+		$this->metaTags = $tags;
+
+		return $this;
+	}
+
+	/**
+	 * Get the list of meta tags assigned to the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	final public function getMetaTags(): array {
+		return $this->metaTags;
+	}
+
+
+	/**
+	 * Add a sub tag to the list.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $sub
+	 * @param string $tag
+	 *
+	 * @return IndexDocument
+	 */
+	final public function addSubTag(string $sub, string $tag): IndexDocument {
+		$this->subTags[$sub] = $tag;
+
+		return $this;
+	}
+
+	/**
+	 * Set the list of sub tags assigned to the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $tags
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setSubTags(array $tags): IndexDocument {
+		$this->subTags = $tags;
+
+		return $this;
+	}
+
+	/**
+	 * Get the list of sub tags assigned to the original document.
+	 * If $formatted is true, the result will be formatted in a one
+	 * dimensional array.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param bool $formatted
+	 *
+	 * @return array
+	 */
+	final public function getSubTags(bool $formatted = false): array {
+		if ($formatted === false) {
+			return $this->subTags;
+		}
+
+		$subTags = [];
+		$ak = array_keys($this->subTags);
+		foreach ($ak as $source) {
+			$tags = $this->subTags[$source];
+			foreach ($tags as $tag) {
+				$subTags[] = $source . '_' . $tag;
+			}
+		}
+
+		return $subTags;
+	}
+
+
+	/**
+	 * Set the source of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $source
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setSource(string $source): IndexDocument {
+		$this->source = $source;
+
+		return $this;
+	}
+
+	/**
+	 * Get the source of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	final public function getSource(): string {
+		return $this->source;
+	}
+
+
+	/**
+	 * Set the title of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $title
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setTitle(string $title): IndexDocument {
+		$this->title = $title;
+
+		return $this;
+	}
+
+	/**
+	 * Get the title of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	final public function getTitle(): string {
+		return $this->title;
+	}
+
+
+	/**
+	 * Set the content of the document.
+	 * $encoded can be NOT_ENCODED or ENCODED_BASE64 if the content is raw or
+	 * encoded in base64.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $content
+	 * @param int $encoded
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setContent(string $content, int $encoded = 0): IndexDocument {
+		$this->content = $content;
+		$this->contentEncoded = $encoded;
+
+		return $this;
+	}
+
+	/**
+	 * Get the content of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	final public function getContent(): string {
+		return $this->content;
+	}
+
+	/**
+	 * Returns the type of the encoding on the content.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return int
+	 */
+	final public function isContentEncoded(): int {
+		return $this->contentEncoded;
+	}
+
+	/**
+	 * Return the size of the content.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return int
+	 */
+	final public function getContentSize(): int {
+		return strlen($this->getContent());
+	}
+
+
+	/**
+	 * Generate an hash, based on the content of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return IndexDocument
+	 */
+	final public function initHash(): IndexDocument {
+		if ($this->getContent() === '' || is_null($this->getContent())) {
+			return $this;
+		}
+
+		$this->hash = hash("md5", $this->getContent());
+
+		return $this;
+	}
+
+	/**
+	 * Set the hash of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $hash
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setHash(string $hash): IndexDocument {
+		$this->hash = $hash;
+
+		return $this;
+	}
+
+	/**
+	 * Get the hash of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	final public function getHash(): string {
+		return $this->hash;
+	}
+
+
+	/**
+	 * Add a part, identified by a string, and its content.
+	 *
+	 * It is strongly advised to use alphanumerical chars with no space in the
+	 * $part string.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $part
+	 * @param string $content
+	 *
+	 * @return IndexDocument
+	 */
+	final public function addPart(string $part, string $content): IndexDocument {
+		$this->parts[$part] = $content;
+
+		return $this;
+	}
+
+	/**
+	 * Set all parts and their content.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $parts
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setParts(array $parts): IndexDocument {
+		$this->parts = $parts;
+
+		return $this;
+	}
+
+	/**
+	 * Get all parts of the IndexDocument.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	final public function getParts(): array {
+		return $this->parts;
+	}
+
+
+	/**
+	 * Add a link, usable by the frontend.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $link
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setLink(string $link): IndexDocument {
+		$this->link = $link;
+
+		return $this;
+	}
+
+	/**
+	 * Get the link.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	final public function getLink(): string {
+		return $this->link;
+	}
+
+
+	/**
+	 * Set more information that couldn't be set using other method.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $more
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setMore(array $more): IndexDocument {
+		$this->more = $more;
+
+		return $this;
+	}
+
+	/**
+	 * Get more information.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	final public function getMore(): array {
+		return $this->more;
+	}
+
+
+	/**
+	 * Add some excerpt of the content of the original document, usually based
+	 * on the search request.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $excerpt
+	 *
+	 * @return IndexDocument
+	 */
+	final public function addExcerpt(string $excerpt): IndexDocument {
+		$excerpt = $this->cleanExcerpt($excerpt);
+
+		$this->excerpts[] = $excerpt;
+
+		return $this;
+	}
+
+	/**
+	 * Set all excerpts of the content of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $excerpts
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setExcerpts(array $excerpts): IndexDocument {
+		$excerpts = array_map([$this, 'cleanExcerpt'], $excerpts);
+
+		$this->excerpts = $excerpts;
+
+		return $this;
+	}
+
+	/**
+	 * Get all excerpts of the content of the original document.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	final public function getExcerpts(): array {
+		return $this->excerpts;
+	}
+
+	/**
+	 * Clean excerpt.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $excerpt
+	 *
+	 * @return string
+	 */
+	final public function cleanExcerpt(string $excerpt): string {
+		$excerpt = str_replace("\\n", ' ', $excerpt);
+		$excerpt = str_replace("\\r", ' ', $excerpt);
+		$excerpt = str_replace("\\t", ' ', $excerpt);
+		$excerpt = str_replace("\n", ' ', $excerpt);
+		$excerpt = str_replace("\r", ' ', $excerpt);
+		$excerpt = str_replace("\t", ' ', $excerpt);
+
+		return $excerpt;
+	}
+
+	/**
+	 * Set the score to the result assigned to this document during a search
+	 * request.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $score
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setScore(string $score): IndexDocument {
+		$this->score = $score;
+
+		return $this;
+	}
+
+	/**
+	 * Get the score.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	final public function getScore(): string {
+		return $this->score;
+	}
+
+
+	/**
+	 * Set some information about the original document that will be available
+	 * to the front-end when displaying search result. (as string)
+	 * Because this information will not be indexed, this method can also be
+	 * used to manage some data while filling the IndexDocument before its
+	 * indexing.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $info
+	 * @param string $value
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setInfo(string $info, string $value): IndexDocument {
+		$this->info[$info] = $value;
+
+		return $this;
+	}
+
+	/**
+	 * Get an information about a document. (string)
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $info
+	 * @param string $default
+	 *
+	 * @return string
+	 */
+	final public function getInfo(string $info, string $default = ''): string {
+		if (!key_exists($info, $this->info)) {
+			return $default;
+		}
+
+		return $this->info[$info];
+	}
+
+	/**
+	 * Set some information about the original document that will be available
+	 * to the front-end when displaying search result. (as array)
+	 * Because this information will not be indexed, this method can also be
+	 * used to manage some data while filling the IndexDocument before its
+	 * indexing.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $info
+	 * @param array $value
+	 *
+	 * @return IndexDocument
+	 */
+	final public function setInfoArray(string $info, array $value): IndexDocument {
+		$this->info[$info] = $value;
+
+		return $this;
+	}
+
+	/**
+	 * Get an information about a document. (array)
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $info
+	 * @param array $default
+	 *
+	 * @return array
+	 */
+	final public function getInfoArray(string $info, array $default = []): array {
+		if (!key_exists($info, $this->info)) {
+			return $default;
+		}
+
+		return $this->info[$info];
+	}
+
+	/**
+	 * Get all info.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	final public function getInfoAll(): array {
+
+		$info = [];
+		foreach ($this->info as $k => $v) {
+			if (substr($k, 0, 1) === '_') {
+				continue;
+			}
+
+			$info[$k] = $v;
+		}
+
+		return $info;
+	}
+
+
+	/**
+	 * @since 15.0.0
+	 *
+	 * On some version of PHP, it is better to force destruct the object.
+	 * And during the index, the number of generated IndexDocument can be
+	 * _huge_.
+	 */
+	public function __destruct() {
+		unset($this->id);
+		unset($this->providerId);
+		unset($this->access);
+		unset($this->modifiedTime);
+		unset($this->title);
+		unset($this->content);
+		unset($this->hash);
+		unset($this->link);
+		unset($this->source);
+		unset($this->tags);
+		unset($this->metaTags);
+		unset($this->subTags);
+		unset($this->more);
+		unset($this->excerpts);
+		unset($this->score);
+		unset($this->info);
+		unset($this->contentEncoded);
+	}
+
+	/**
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function jsonSerialize() {
+		return [
+			'id' => $this->getId(),
+			'providerId' => $this->getProviderId(),
+			'access' => $this->access,
+			'modifiedTime' => $this->getModifiedTime(),
+			'title' => $this->getTitle(),
+			'link' => $this->getLink(),
+			'index' => $this->index,
+			'source' => $this->getSource(),
+			'info' => $this->getInfoAll(),
+			'hash' => $this->getHash(),
+			'contentSize' => $this->getContentSize(),
+			'tags' => $this->getTags(),
+			'metatags' => $this->getMetaTags(),
+			'subtags' => $this->getSubTags(),
+			'more' => $this->getMore(),
+			'excerpts' => $this->getExcerpts(),
+			'score' => $this->getScore()
+		];
+	}
+
+}
+
diff --git a/lib/public/FullTextSearch/Model/SearchOption.php b/lib/public/FullTextSearch/Model/SearchOption.php
new file mode 100644
index 00000000000..ae6ad3241b6
--- /dev/null
+++ b/lib/public/FullTextSearch/Model/SearchOption.php
@@ -0,0 +1,296 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch\Model;
+
+
+use JsonSerializable;
+
+
+/**
+ * @since 15.0.0
+ *
+ * Class SearchOption
+ *
+ * @package OCP\FullTextSearch\Model
+ */
+final class SearchOption implements JsonSerializable {
+
+
+	const CHECKBOX = 'checkbox';
+	const INPUT = 'input';
+
+	const INPUT_SMALL = 'small';
+
+
+	/** @var string */
+	private $name = '';
+
+	/** @var string */
+	private $title = '';
+
+	/** @var string */
+	private $type = '';
+
+	/** @var string */
+	private $size = '';
+
+	/** @var string */
+	private $placeholder = '';
+
+
+	/**
+	 *     *
+	 *
+	 * The array can be empty in case no search options are available.
+	 * The format of the array must be like this:
+	 *
+	 * [
+	 *   'panel' => [
+	 *     'options' => [
+	 *         OPTION1,
+	 *         OPTION2,
+	 *         OPTION3
+	 *     ]
+	 *   ],
+	 *   'navigation' => [
+	 *     'icon'    => 'css-class-of-the-icon',
+	 *     'options' => [
+	 *         OPTION1,
+	 *         OPTION2,
+	 *         OPTION3
+	 *     ]
+	 *   ]
+	 * ]
+	 *
+	 * - PANEL contains entries that will be displayed in the app itself, when
+	 *   a search is initiated.
+	 * - NAVIGATION contains entries that will be available when using the
+	 *   FullTextSearch navigation page
+	 * - OPTION is an element that define each option available to the user.
+	 *
+	 * The format for the options must be like this:
+	 *
+	 * [
+	 *   'name'        => 'name_of_the_option',
+	 *   'title'       => 'Name displayed in the panel',
+	 *   'type'        => '',
+	 *   'size'        => ''   (optional),
+	 *   'placeholder' => ''   (optional)
+	 * ]
+	 *
+	 * - NAME is the variable name that is sent to the IFullTextSearchProvider
+	 *   when a ISearchRequest is requested. (keys in the array returned by the
+	 *   ISearchRequest->getOptions())
+	 * - TYPE can be 'input' or 'checkbox'
+	 * - SIZE is only used in case TYPE='input', default is 'large' but can be
+	 *   'small'
+	 * - PLACEHOLDER is only used in case TYPE='input', default is empty.
+	 */
+
+	/**
+	 * SearchOption constructor.
+	 *
+	 * Some value can be setduring the creation of the object.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $name
+	 * @param string $title
+	 * @param string $type
+	 * @param string $size
+	 * @param string $placeholder
+	 */
+	public function __construct(string $name = '', string $title = '', string $type = '', string $size = '', string $placeholder = '') {
+		$this->name = $name;
+		$this->title = $title;
+		$this->type = $type;
+		$this->size = $size;
+		$this->placeholder = $placeholder;
+	}
+
+
+	/**
+	 * Set the name/key of the option.
+	 * The string should only contains alphanumerical chars and underscore.
+	 * The key can be retrieve when using ISearchRequest::getOption
+	 *
+	 * @see ISearchRequest::getOption
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $name
+	 *
+	 * @return SearchOption
+	 */
+	public function setName(string $name): SearchOption {
+		$this->name = $name;
+
+		return $this;
+	}
+
+	/**
+	 * Get the name/key of the option.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getName(): string {
+		return $this->name;
+	}
+
+
+	/**
+	 * Set the title/display name of the option.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $title
+	 *
+	 * @return SearchOption
+	 */
+	public function setTitle(string $title): SearchOption {
+		$this->title = $title;
+
+		return $this;
+	}
+
+	/**
+	 * Get the title of the option.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getTitle(): string {
+		return $this->title;
+	}
+
+
+	/**
+	 * Set the type of the option.
+	 * $type can be SearchOption::CHECKBOX or SearchOption::INPUT
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $type
+	 *
+	 * @return SearchOption
+	 */
+	public function setType(string $type): SearchOption {
+		$this->type = $type;
+
+		return $this;
+	}
+
+	/**
+	 * Get the type of the option.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getType(): string {
+		return $this->type;
+	}
+
+
+	/**
+	 * In case of Type is INPUT, set the size of the input field.
+	 * Value can be SearchOption::INPUT_SMALL or not defined.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $size
+	 *
+	 * @return SearchOption
+	 */
+	public function setSize(string $size): SearchOption {
+		$this->size = $size;
+
+		return $this;
+	}
+
+	/**
+	 * Get the size of the INPUT.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getSize(): string {
+		return $this->size;
+	}
+
+
+	/**
+	 * In case of Type is , set the placeholder to be displayed in the input
+	 * field.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $placeholder
+	 *
+	 * @return SearchOption
+	 */
+	public function setPlaceholder(string $placeholder): SearchOption {
+		$this->placeholder = $placeholder;
+
+		return $this;
+	}
+
+	/**
+	 * Get the placeholder.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getPlaceholder(): string {
+		return $this->placeholder;
+	}
+
+
+	/**
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function jsonSerialize(): array {
+		return [
+			'name' => $this->getName(),
+			'title' => $this->getTitle(),
+			'type' => $this->getType(),
+			'size' => $this->getSize(),
+			'placeholder' => $this->getPlaceholder()
+		];
+	}
+}
diff --git a/lib/public/FullTextSearch/Model/SearchTemplate.php b/lib/public/FullTextSearch/Model/SearchTemplate.php
new file mode 100644
index 00000000000..7d9159190ea
--- /dev/null
+++ b/lib/public/FullTextSearch/Model/SearchTemplate.php
@@ -0,0 +1,258 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018
+ * @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 OCP\FullTextSearch\Model;
+
+
+use JsonSerializable;
+use OCP\FullTextSearch\IFullTextSearchProvider;
+
+
+/**
+ * Class SearchTemplate
+ *
+ * This is a data transfer object that should be created by Content Provider
+ * when the getSearchTemplate() method is called.
+ *
+ * The object will contain templates to be displayed, and the list of the different
+ * options to be available to the user when he start a new search.
+ *
+ * The display of the Options is generated by the FullTextSearch app and Options
+ * can be displayed in 2 places:
+ *
+ * - the navigation page of the app that generate the indexed content.
+ *   (files, bookmarks, deck, mails, ...)
+ * - the navigation page of the FullTextSearch app.
+ *
+ * Both pages will have different Options, and only the first one can integrate
+ * a specific template.
+ *
+ * @see IFullTextSearchProvider::getSearchTemplate
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch\Model
+ */
+final class SearchTemplate implements JsonSerializable {
+
+
+	/** @var string */
+	private $icon = '';
+
+	/** @var string */
+	private $css = '';
+
+	/** @var string */
+	private $template = '';
+
+	/** @var SearchOption[] */
+	private $panelOptions = [];
+
+	/** @var SearchOption[] */
+	private $navigationOptions = [];
+
+
+	/**
+	 * SearchTemplate constructor.
+	 *
+	 * the class of the icon and the css file to be loaded can be set during the
+	 * creation of the object.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $icon
+	 * @param string $css
+	 */
+	public function __construct(string $icon = '', string $css = '') {
+		$this->icon = $icon;
+		$this->css = $css;
+	}
+
+
+	/**
+	 * Set the class of the icon to be displayed in the left panel of the
+	 * FullTextSearch navigation page, in front of the related Content Provider.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $class
+	 *
+	 * @return SearchTemplate
+	 */
+	public function setIcon(string $class): SearchTemplate {
+		$this->icon = $class;
+
+		return $this;
+	}
+
+	/**
+	 * Get the class of the icon.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getIcon(): string {
+		return $this->icon;
+	}
+
+
+	/**
+	 * Set the path of a CSS file that will be loaded when needed.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $css
+	 *
+	 * @return SearchTemplate
+	 */
+	public function setCss(string $css): SearchTemplate {
+		$this->css = $css;
+
+		return $this;
+	}
+
+	/**
+	 * Get the path of the CSS file.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getCss(): string {
+		return $this->css;
+	}
+
+
+	/**
+	 * Set the path of the file of a template that the HTML will be displayed
+	 * below the Options.
+	 * This should only be used if your Content Provider needs to set options in
+	 * a way not generated by FullTextSearch
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $template
+	 *
+	 * @return SearchTemplate
+	 */
+	public function setTemplate(string $template): SearchTemplate {
+		$this->template = $template;
+
+		return $this;
+	}
+
+	/**
+	 * Get the path of the template file.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return string
+	 */
+	public function getTemplate(): string {
+		return $this->template;
+	}
+
+
+	/**
+	 * Add an option in the Panel that is displayed when the user start a search
+	 * within the app that generate the content.
+	 *
+	 * @see SearchOption
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param SearchOption $option
+	 *
+	 * @return SearchTemplate
+	 */
+	public function addPanelOption(SearchOption $option): SearchTemplate {
+		$this->panelOptions[] = $option;
+
+		return $this;
+	}
+
+	/**
+	 * Get all options to be displayed in the Panel.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return SearchOption[]
+	 */
+	public function getPanelOptions(): array {
+		return $this->panelOptions;
+	}
+
+
+	/**
+	 * Add an option in the left panel of the FullTextSearch navigation page.
+	 *
+	 * @see SearchOption
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param SearchOption $option
+	 *
+	 * @return SearchTemplate
+	 */
+	public function addNavigationOption(SearchOption $option): SearchTemplate {
+		$this->navigationOptions[] = $option;
+
+		return $this;
+	}
+
+	/**
+	 * Get all options to be displayed in the FullTextSearch navigation page.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function getNavigationOptions(): array {
+		return $this->navigationOptions;
+	}
+
+
+	/**
+	 * @since 15.0.0
+	 *
+	 * @return array
+	 */
+	public function jsonSerialize(): array {
+		return [
+			'icon' => $this->getIcon(),
+			'css' => $this->getCss(),
+			'template' => $this->getTemplate(),
+			'panel' => $this->getPanelOptions(),
+			'navigation' => $this->getNavigationOptions()
+		];
+	}
+}
+
diff --git a/lib/public/FullTextSearch/Service/IIndexService.php b/lib/public/FullTextSearch/Service/IIndexService.php
new file mode 100644
index 00000000000..376c07a4490
--- /dev/null
+++ b/lib/public/FullTextSearch/Service/IIndexService.php
@@ -0,0 +1,99 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018, Maxence Lange <maxence@artificial-owl.com>
+ * @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 OCP\FullTextSearch\Service;
+
+
+use OCP\FullTextSearch\Model\IIndex;
+
+
+/**
+ * Interface IIndexService
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch\Service
+ */
+interface IIndexService {
+
+
+	/**
+	 * Retrieve an Index from the database, based on the Id of the Provider
+	 * and the Id of the Document
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param string $documentId
+	 *
+	 * @return IIndex
+	 */
+	public function getIndex(string $providerId, string $documentId): IIndex;
+
+
+	/**
+	 * Update the status of an Index. status is a bit flag, setting $reset to
+	 * true will reset the status to the value defined in the parameter.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param $documentId
+	 * @param int $status
+	 * @param bool $reset
+	 */
+	public function updateIndexStatus(string $providerId, $documentId, int $status, bool $reset = false);
+
+
+	/**
+	 * Update the status of an array of Index. status is a bit flag, setting $reset to
+	 * true will reset the status to the value defined in the parameter.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param array $documentIds
+	 * @param int $status
+	 * @param bool $reset
+	 */
+	public function updateIndexesStatus(string $providerId, array $documentIds, int $status, bool $reset = false);
+
+
+	/**
+	 * Update an array of Index.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $indexes
+	 */
+	public function updateIndexes(array $indexes);
+
+}
+
diff --git a/lib/public/FullTextSearch/Service/IProviderService.php b/lib/public/FullTextSearch/Service/IProviderService.php
new file mode 100644
index 00000000000..64153c13965
--- /dev/null
+++ b/lib/public/FullTextSearch/Service/IProviderService.php
@@ -0,0 +1,65 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018, Maxence Lange <maxence@artificial-owl.com>
+ * @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 OCP\FullTextSearch\Service;
+
+
+/**
+ * Interface IProviderService
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch\Service
+ */
+interface IProviderService {
+
+
+	/**
+	 * Check if the provider $providerId is already indexed.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 *
+	 * @return bool
+	 */
+	public function isProviderIndexed(string $providerId);
+
+
+	/**
+	 * Add the Javascript API in the navigation page of an app.
+	 *
+	 * @since 15.0.0
+	 */
+	public function addJavascriptAPI();
+
+
+}
+
diff --git a/lib/public/FullTextSearch/Service/ISearchService.php b/lib/public/FullTextSearch/Service/ISearchService.php
new file mode 100644
index 00000000000..7da38e44f5c
--- /dev/null
+++ b/lib/public/FullTextSearch/Service/ISearchService.php
@@ -0,0 +1,89 @@
+<?php
+declare(strict_types=1);
+
+
+/**
+ * FullTextSearch - Full text search framework for Nextcloud
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2018, Maxence Lange <maxence@artificial-owl.com>
+ * @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 OCP\FullTextSearch\Service;
+
+
+use OCP\FullTextSearch\Model\ISearchRequest;
+use OCP\FullTextSearch\Model\ISearchResult;
+
+
+/**
+ * Interface ISearchService
+ *
+ * @since 15.0.0
+ *
+ * @package OCP\FullTextSearch\Service
+ */
+interface ISearchService {
+
+
+	/**
+	 * generate a search request, based on an array:
+	 *
+	 * $request =
+	 *   [
+	 *        'providers' =>    (string/array) 'all'
+	 *        'author' =>       (string) owner of the document.
+	 *        'search' =>       (string) search string,
+	 *        'size' =>         (int) number of items to be return
+	 *        'page' =>         (int) page
+	 *        'parts' =>        (array) parts of document to search within,
+	 *        'options' =       (array) search options,
+	 *        'tags'     =>     (array) tags,
+	 *        'metatags' =>     (array) metatags,
+	 *        'subtags'  =>     (array) subtags
+	 *   ]
+	 *
+	 * 'providers' can be an array of providerIds
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $request
+	 *
+	 * @return ISearchRequest
+	 */
+	public function generateSearchRequest(array $request): ISearchRequest;
+
+
+	/**
+	 * Search documents
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $userId
+	 * @param ISearchRequest $searchRequest
+	 *
+	 * @return ISearchResult[]
+	 */
+	public function search(string $userId, ISearchRequest $searchRequest): array;
+
+}
+