Splits off the logic from sharees endpoint thus making it available from

within Nc/via PHP.

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

8 files changed, 877 insertions, 0 deletions

diff --git a/lib/private/Collaboration/Collaborators/CirclePlugin.php b/lib/private/Collaboration/Collaborators/CirclePlugin.php
new file mode 100644
index 00000000000..3d476644ecc
--- /dev/null
+++ b/lib/private/Collaboration/Collaborators/CirclePlugin.php
@@ -0,0 +1,49 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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 OC\Collaboration\Collaborators;
+
+
+use OCA\Circles\Api\Sharees;
+use OCP\Collaboration\Collaborators\ISearchPlugin;
+use OCP\Collaboration\Collaborators\ISearchResult;
+
+class CirclePlugin implements ISearchPlugin {
+	public function search($search, $limit, $offset, ISearchResult $searchResult) {
+		$result = ['wide' => [], 'exact' => []];
+
+		if(\OC_App::isEnabled('circles')) {
+			$circles = Sharees::search($search);
+			if (array_key_exists('circles', $circles['exact'])) {
+				$result['exact'] = $circles['exact']['circles'];
+			}
+			if (array_key_exists('circles', $circles)) {
+				$result['wide'] = $circles['circles'];
+			}
+
+			$searchResult->addResultSet('circles', $result['wide'], $result['exact']);
+		}
+
+		return false;
+	}
+}
diff --git a/lib/private/Collaboration/Collaborators/GroupPlugin.php b/lib/private/Collaboration/Collaborators/GroupPlugin.php
new file mode 100644
index 00000000000..d156190eed9
--- /dev/null
+++ b/lib/private/Collaboration/Collaborators/GroupPlugin.php
@@ -0,0 +1,122 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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 OC\Collaboration\Collaborators;
+
+use OCP\Collaboration\Collaborators\ISearchPlugin;
+use OCP\Collaboration\Collaborators\ISearchResult;
+use OCP\IConfig;
+use OCP\IGroup;
+use OCP\IGroupManager;
+use OCP\IUserSession;
+use OCP\Share;
+
+class GroupPlugin implements ISearchPlugin {
+	protected $shareeEnumeration;
+	protected $shareWithGroupOnly;
+
+	/** @var IGroupManager */
+	private $groupManager;
+	/** @var IConfig */
+	private $config;
+	/** @var IUserSession */
+	private $userSession;
+
+	public function __construct(IConfig $config, IGroupManager $groupManager, IUserSession $userSession) {
+		$this->groupManager = $groupManager;
+		$this->config = $config;
+		$this->userSession = $userSession;
+
+		$this->shareeEnumeration = $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';
+		$this->shareWithGroupOnly = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';
+	}
+
+	public function search($search, $limit, $offset, ISearchResult $searchResult) {
+		$hasMoreResults = false;
+		$result = ['wide' => [], 'exact' => []];
+
+		$groups = $this->groupManager->search($search, $limit, $offset);
+		$groupIds = array_map(function (IGroup $group) { return $group->getGID(); }, $groups);
+
+		if (!$this->shareeEnumeration || sizeof($groups) < $limit) {
+			$hasMoreResults = true;
+		}
+
+		$userGroups =  [];
+		if (!empty($groups) && $this->shareWithGroupOnly) {
+			// Intersect all the groups that match with the groups this user is a member of
+			$userGroups = $this->groupManager->getUserGroups($this->userSession->getUser());
+			$userGroups = array_map(function (IGroup $group) { return $group->getGID(); }, $userGroups);
+			$groupIds = array_intersect($groupIds, $userGroups);
+		}
+
+		$lowerSearch = strtolower($search);
+		foreach ($groups as $group) {
+			// FIXME: use a more efficient approach
+			$gid = $group->getGID();
+			if (!in_array($gid, $groupIds)) {
+				continue;
+			}
+			if (strtolower($gid) === $lowerSearch || strtolower($group->getDisplayName()) === $lowerSearch) {
+				$result['exact'][] = [
+					'label' => $group->getDisplayName(),
+					'value' => [
+						'shareType' => Share::SHARE_TYPE_GROUP,
+						'shareWith' => $gid,
+					],
+				];
+			} else {
+				$result['wide'][] = [
+					'label' => $group->getDisplayName(),
+					'value' => [
+						'shareType' => Share::SHARE_TYPE_GROUP,
+						'shareWith' => $gid,
+					],
+				];
+			}
+		}
+
+		if ($offset === 0 && empty($result['exact'])) {
+			// On page one we try if the search result has a direct hit on the
+			// user id and if so, we add that to the exact match list
+			$group = $this->groupManager->get($search);
+			if ($group instanceof IGroup && (!$this->shareWithGroupOnly || in_array($group->getGID(), $userGroups))) {
+				array_push($result['exact'], [
+					'label' => $group->getDisplayName(),
+					'value' => [
+						'shareType' => Share::SHARE_TYPE_GROUP,
+						'shareWith' => $group->getGID(),
+					],
+				]);
+			}
+		}
+
+		if (!$this->shareeEnumeration) {
+			$result['wide'] = [];
+		}
+
+		$searchResult->addResultSet('groups', $result['wide'], $result['exact']);
+
+		return [$result, $hasMoreResults];
+	}
+}
diff --git a/lib/private/Collaboration/Collaborators/LookupPlugin.php b/lib/private/Collaboration/Collaborators/LookupPlugin.php
new file mode 100644
index 00000000000..567b41ca76f
--- /dev/null
+++ b/lib/private/Collaboration/Collaborators/LookupPlugin.php
@@ -0,0 +1,83 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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 OC\Collaboration\Collaborators;
+
+
+use OCP\Collaboration\Collaborators\ISearchPlugin;
+use OCP\Collaboration\Collaborators\ISearchResult;
+use OCP\Http\Client\IClientService;
+use OCP\IConfig;
+use OCP\Share;
+
+class LookupPlugin implements ISearchPlugin {
+
+	/** @var IConfig */
+	private $config;
+	/** @var IClientService */
+	private $clientService;
+
+	public function __construct(IConfig $config, IClientService $clientService) {
+		$this->config = $config;
+		$this->clientService = $clientService;
+	}
+
+	public function search($search, $limit, $offset, ISearchResult $searchResult) {
+		if ($this->config->getAppValue('files_sharing', 'lookupServerEnabled', 'no') !== 'yes') {
+			return false;
+		}
+
+		$lookupServerUrl = $this->config->getSystemValue('lookup_server', 'https://lookup.nextcloud.com');
+		$lookupServerUrl = rtrim($lookupServerUrl, '/');
+		$result = ['wide' => [], 'exact' => []];
+
+		try {
+			$client = $this->clientService->newClient();
+			$response = $client->get(
+				$lookupServerUrl . '/users?search=' . urlencode($search),
+				[
+					'timeout' => 10,
+					'connect_timeout' => 3,
+				]
+			);
+
+			$body = json_decode($response->getBody(), true);
+
+			$result = [];
+			foreach ($body as $lookup) {
+				$result[] = [
+					'label' => $lookup['federationId'],
+					'value' => [
+						'shareType' => Share::SHARE_TYPE_REMOTE,
+						'shareWith' => $lookup['federationId'],
+					],
+					'extra' => $lookup,
+				];
+			}
+		} catch (\Exception $e) {
+		}
+
+		$searchResult->addResultSet('lookup', $result, []);
+
+	}
+}
diff --git a/lib/private/Collaboration/Collaborators/MailPlugin.php b/lib/private/Collaboration/Collaborators/MailPlugin.php
new file mode 100644
index 00000000000..bd4d70e41de
--- /dev/null
+++ b/lib/private/Collaboration/Collaborators/MailPlugin.php
@@ -0,0 +1,162 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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 OC\Collaboration\Collaborators;
+
+
+use OCP\Collaboration\Collaborators\ISearchPlugin;
+use OCP\Collaboration\Collaborators\ISearchResult;
+use OCP\Contacts\IManager;
+use OCP\Federation\ICloudIdManager;
+use OCP\IConfig;
+use OCP\Share;
+
+class MailPlugin implements ISearchPlugin {
+	protected $shareeEnumeration;
+
+	/** @var IManager */
+	private $contactsManager;
+	/** @var ICloudIdManager */
+	private $cloudIdManager;
+	/** @var IConfig */
+	private $config;
+
+	public function __construct(IManager $contactsManager, ICloudIdManager $cloudIdManager, IConfig $config) {
+		$this->contactsManager = $contactsManager;
+		$this->cloudIdManager = $cloudIdManager;
+		$this->config = $config;
+
+		$this->shareeEnumeration = $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';
+	}
+
+	/**
+	 * @param $search
+	 * @param $limit
+	 * @param $offset
+	 * @param ISearchResult $searchResult
+	 * @return bool
+	 * @since 13.0.0
+	 */
+	public function search($search, $limit, $offset, ISearchResult $searchResult) {
+		$result = ['wide' => [], 'exact' => []];
+
+		// Search in contacts
+		//@todo Pagination missing
+		$addressBookContacts = $this->contactsManager->search($search, ['EMAIL', 'FN']);
+		$lowerSearch = strtolower($search);
+		foreach ($addressBookContacts as $contact) {
+			if (isset($contact['EMAIL'])) {
+				$emailAddresses = $contact['EMAIL'];
+				if (!is_array($emailAddresses)) {
+					$emailAddresses = [$emailAddresses];
+				}
+				foreach ($emailAddresses as $emailAddress) {
+					$exactEmailMatch = strtolower($emailAddress) === $lowerSearch;
+
+					if (isset($contact['isLocalSystemBook'])) {
+						if ($exactEmailMatch) {
+							try {
+								$cloud = $this->cloudIdManager->resolveCloudId($contact['CLOUD'][0]);
+							} catch (\InvalidArgumentException $e) {
+								continue;
+							}
+
+							if (!$searchResult->hasResult('users', $cloud->getUser())) {
+								$singleResult = [[
+									'label' => $contact['FN'] . " ($emailAddress)",
+									'value' => [
+										'shareType' => Share::SHARE_TYPE_USER,
+										'shareWith' => $cloud->getUser(),
+									],
+								]];
+								$searchResult->addResultSet('users', [], $singleResult);
+								$searchResult->markExactIdMatch('emails');
+							}
+							return false;
+						}
+
+						if ($this->shareeEnumeration) {
+							try {
+								$cloud = $this->cloudIdManager->resolveCloudId($contact['CLOUD'][0]);
+							} catch (\InvalidArgumentException $e) {
+								continue;
+							}
+
+							if (!$searchResult->hasResult('users', $cloud->getUser())) {
+								$singleResult = [[
+									'label' => $contact['FN'] . " ($emailAddress)",
+									'value' => [
+										'shareType' => Share::SHARE_TYPE_USER,
+										'shareWith' => $cloud->getUser(),
+									]],
+								];
+								$searchResult->addResultSet('users', $singleResult, []);
+								$result = [];
+							}
+						}
+						continue;
+					}
+
+					if ($exactEmailMatch || strtolower($contact['FN']) === $lowerSearch) {
+						if ($exactEmailMatch) {
+							$searchResult->markExactIdMatch('emails');
+						}
+						$result['exact'][] = [
+							'label' => $contact['FN'] . " ($emailAddress)",
+							'value' => [
+								'shareType' => Share::SHARE_TYPE_EMAIL,
+								'shareWith' => $emailAddress,
+							],
+						];
+					} else {
+						$result['wide'][] = [
+							'label' => $contact['FN'] . " ($emailAddress)",
+							'value' => [
+								'shareType' => Share::SHARE_TYPE_EMAIL,
+								'shareWith' => $emailAddress,
+							],
+						];
+					}
+				}
+			}
+		}
+
+		if (!$this->shareeEnumeration) {
+			$result['wide'] = [];
+		}
+
+		if (!$searchResult->hasExactIdMatch('emails') && filter_var($search, FILTER_VALIDATE_EMAIL)) {
+			$result['exact'][] = [
+				'label' => $search,
+				'value' => [
+					'shareType' => Share::SHARE_TYPE_EMAIL,
+					'shareWith' => $search,
+				],
+			];
+		}
+
+		$searchResult->addResultSet('emails', $result['wide'], $result['exact']);
+
+		return false;
+	}
+}
diff --git a/lib/private/Collaboration/Collaborators/RemotePlugin.php b/lib/private/Collaboration/Collaborators/RemotePlugin.php
new file mode 100644
index 00000000000..ff075b8e42d
--- /dev/null
+++ b/lib/private/Collaboration/Collaborators/RemotePlugin.php
@@ -0,0 +1,135 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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 OC\Collaboration\Collaborators;
+
+
+use OCP\Collaboration\Collaborators\ISearchPlugin;
+use OCP\Collaboration\Collaborators\ISearchResult;
+use OCP\Contacts\IManager;
+use OCP\Federation\ICloudIdManager;
+use OCP\IConfig;
+use OCP\Share;
+
+class RemotePlugin implements ISearchPlugin {
+	protected $shareeEnumeration;
+
+	/** @var IManager */
+	private $contactsManager;
+	/** @var ICloudIdManager */
+	private $cloudIdManager;
+	/** @var IConfig */
+	private $config;
+
+	public function __construct(IManager $contactsManager, ICloudIdManager $cloudIdManager, IConfig $config) {
+		$this->contactsManager = $contactsManager;
+		$this->cloudIdManager = $cloudIdManager;
+		$this->config = $config;
+
+		$this->shareeEnumeration = $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';
+	}
+
+	public function search($search, $limit, $offset, ISearchResult $searchResult) {
+		$result = ['wide' => [], 'exact' => []];
+
+		// Search in contacts
+		//@todo Pagination missing
+		$addressBookContacts = $this->contactsManager->search($search, ['CLOUD', 'FN']);
+		foreach ($addressBookContacts as $contact) {
+			if (isset($contact['isLocalSystemBook'])) {
+				continue;
+			}
+			if (isset($contact['CLOUD'])) {
+				$cloudIds = $contact['CLOUD'];
+				if (!is_array($cloudIds)) {
+					$cloudIds = [$cloudIds];
+				}
+				$lowerSearch = strtolower($search);
+				foreach ($cloudIds as $cloudId) {
+					try {
+						list(, $serverUrl) = $this->splitUserRemote($cloudId);
+					} catch (\InvalidArgumentException $e) {
+						continue;
+					}
+
+					if (strtolower($contact['FN']) === $lowerSearch || strtolower($cloudId) === $lowerSearch) {
+						if (strtolower($cloudId) === $lowerSearch) {
+							$searchResult->hasExactIdMatch('remotes');
+						}
+						$result['exact'][] = [
+							'label' => $contact['FN'] . " ($cloudId)",
+							'value' => [
+								'shareType' => Share::SHARE_TYPE_REMOTE,
+								'shareWith' => $cloudId,
+								'server' => $serverUrl,
+							],
+						];
+					} else {
+						$result['wide'][] = [
+							'label' => $contact['FN'] . " ($cloudId)",
+							'value' => [
+								'shareType' => Share::SHARE_TYPE_REMOTE,
+								'shareWith' => $cloudId,
+								'server' => $serverUrl,
+							],
+						];
+					}
+				}
+			}
+		}
+
+		if (!$this->shareeEnumeration) {
+			$result['wide'] = [];
+		}
+
+		if (!$searchResult->hasExactIdMatch('remotes') && $this->cloudIdManager->isValidCloudId($search) && $offset === 0) {
+			$result['exact'][] = [
+				'label' => $search,
+				'value' => [
+					'shareType' => Share::SHARE_TYPE_REMOTE,
+					'shareWith' => $search,
+				],
+			];
+		}
+
+		$searchResult->addResultSet('remotes', $result['wide'], $result['exact']);
+
+		return false;
+	}
+
+	/**
+	 * split user and remote from federated cloud id
+	 *
+	 * @param string $address federated share address
+	 * @return array [user, remoteURL]
+	 * @throws \InvalidArgumentException
+	 */
+	public function splitUserRemote($address) {
+		try {
+			$cloudId = $this->cloudIdManager->resolveCloudId($address);
+			return [$cloudId->getUser(), $cloudId->getRemote()];
+		} catch (\InvalidArgumentException $e) {
+			throw new \InvalidArgumentException('Invalid Federated Cloud ID', 0, $e);
+		}
+	}
+}
diff --git a/lib/private/Collaboration/Collaborators/Search.php b/lib/private/Collaboration/Collaborators/Search.php
new file mode 100644
index 00000000000..abca13bcfe9
--- /dev/null
+++ b/lib/private/Collaboration/Collaborators/Search.php
@@ -0,0 +1,82 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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 OC\Collaboration\Collaborators;
+
+use OCP\Collaboration\Collaborators\ISearch;
+use OCP\Collaboration\Collaborators\ISearchPlugin;
+use OCP\Collaboration\Collaborators\ISearchResult;
+use OCP\IContainer;
+use OCP\Share;
+
+class Search implements ISearch {
+	/** @var IContainer */
+	private $c;
+
+	public function __construct(IContainer $c) {
+		$this->c = $c;
+	}
+
+	public function search($search, array $shareTypes, $lookup, $limit, $offset) {
+		$hasMoreResults = false;
+
+		$pluginList = [
+			Share::SHARE_TYPE_USER => UserPlugin::class,
+			Share::SHARE_TYPE_GROUP => GroupPlugin::class,
+			Share::SHARE_TYPE_CIRCLE => CirclePlugin::class,
+			Share::SHARE_TYPE_EMAIL => MailPlugin::class,
+			Share::SHARE_TYPE_REMOTE => RemotePlugin::class,
+		];
+
+		/** @var ISearchResult $searchResult */
+		$searchResult = $this->c->resolve(SearchResult::class);
+
+		foreach ($shareTypes as $type) {
+			if(!isset($pluginList[$type])) {
+				continue;
+			}
+			/** @var ISearchPlugin $searchPlugin */
+			$searchPlugin = $this->c->resolve($pluginList[$type]);
+			$hasMoreResults |= $searchPlugin->search($search, $limit, $offset, $searchResult);
+		}
+
+		// Get from lookup server, not a separate share type
+		if ($lookup) {
+			$searchPlugin = $this->c->resolve(LookupPlugin::class);
+			$hasMoreResults |= $searchPlugin->search($search, $limit, $offset, $searchResult);
+		}
+
+		// sanitizing, could go into the plugins as well
+
+		// if we have a exact match, either for the federated cloud id or for the
+		// email address we only return the exact match. It is highly unlikely
+		// that the exact same email address and federated cloud id exists
+		if($searchResult->hasExactIdMatch('emails') && !$searchResult->hasExactIdMatch('remotes')) {
+			$searchResult->unsetResult('remotes');
+		} elseif (!$searchResult->hasExactIdMatch('emails') && $searchResult->hasExactIdMatch('remotes')) {
+			$searchResult->unsetResult('emails');
+		}
+
+		return [$searchResult->asArray(), $hasMoreResults];
+	}
+}
diff --git a/lib/private/Collaboration/Collaborators/SearchResult.php b/lib/private/Collaboration/Collaborators/SearchResult.php
new file mode 100644
index 00000000000..f3559c9327f
--- /dev/null
+++ b/lib/private/Collaboration/Collaborators/SearchResult.php
@@ -0,0 +1,97 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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 OC\Collaboration\Collaborators;
+
+
+use OCP\Collaboration\Collaborators\ISearchResult;
+
+class SearchResult implements ISearchResult {
+
+	protected $result = [
+		'exact' => [
+			'users' => [],
+			'groups' => [],
+			'remotes' => [],
+			'emails' => [],
+			'circles' => [],
+		],
+		'users' => [],
+		'groups' => [],
+		'remotes' => [],
+		'emails' => [],
+		'lookup' => [],
+		'circles' => [],
+	];
+
+	protected $exactIdMatches = [];
+
+	public function addResultSet($type, array $matches, array $exactMatches = null) {
+		if(!isset($this->result[$type])) {
+			throw new \InvalidArgumentException('Invalid type provided');
+		}
+
+		$this->result[$type] = array_merge($this->result[$type], $matches);
+		if(is_array($exactMatches)) {
+			$this->result['exact'][$type] = array_merge($this->result['exact'][$type], $exactMatches);
+		}
+	}
+
+	public function markExactIdMatch($type) {
+		$this->exactIdMatches[$type] = 1;
+	}
+
+	public function hasExactIdMatch($type) {
+		return isset($this->exactIdMatches[$type]);
+	}
+
+	public function hasResult($type, $collaboratorId) {
+		if(!isset($this->result[$type])) {
+			throw new \InvalidArgumentException('Invalid type provided');
+		}
+
+		$resultArrays = [$this->result['exact'][$type], $this->result[$type]];
+		foreach($resultArrays as $resultArray) {
+			if ($resultArray['value']['shareWith'] === $collaboratorId) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	public function asArray() {
+		return $this->result;
+	}
+
+	public function unsetResult($type) {
+		if(!isset($this->result[$type])) {
+			throw new \InvalidArgumentException('Invalid type provided');
+		}
+
+		$this->result[$type] = [];
+		if(isset($this->$result['exact'][$type])) {
+			$this->result['exact'][$type] = [];
+		}
+	}
+}
diff --git a/lib/private/Collaboration/Collaborators/UserPlugin.php b/lib/private/Collaboration/Collaborators/UserPlugin.php
new file mode 100644
index 00000000000..815862b8726
--- /dev/null
+++ b/lib/private/Collaboration/Collaborators/UserPlugin.php
@@ -0,0 +1,147 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @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 OC\Collaboration\Collaborators;
+
+
+use OCP\Collaboration\Collaborators\ISearchPlugin;
+use OCP\Collaboration\Collaborators\ISearchResult;
+use OCP\IConfig;
+use OCP\IGroupManager;
+use OCP\IUser;
+use OCP\IUserManager;
+use OCP\IUserSession;
+use OCP\Share;
+
+class UserPlugin implements ISearchPlugin {
+	/* @var bool */
+	protected $shareWithGroupOnly;
+	protected $shareeEnumeration;
+
+	/** @var IConfig */
+	private $config;
+	/** @var IGroupManager */
+	private $groupManager;
+	/** @var IUserSession */
+	private $userSession;
+	/** @var IUserManager */
+	private $userManager;
+
+	public function __construct(IConfig $config, IUserManager $userManager, IGroupManager $groupManager, IUserSession $userSession) {
+		$this->config = $config;
+		
+		$this->shareWithGroupOnly = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';
+		$this->groupManager = $groupManager;
+		$this->userSession = $userSession;
+		$this->userManager = $userManager;
+
+		$this->shareeEnumeration = $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';
+	}
+
+	public function search($search, $limit, $offset, ISearchResult $searchResult) {
+		$result = ['wide' => [], 'exact' => []];
+		$users = [];
+		$hasMoreResults = false;
+
+		$userGroups = [];
+		if ($this->shareWithGroupOnly) {
+			// Search in all the groups this user is part of
+			$userGroups = $this->groupManager->getUserGroupIds($this->userSession->getUser());
+			foreach ($userGroups as $userGroup) {
+				$usersTmp = $this->groupManager->displayNamesInGroup($userGroup, $search, $limit, $offset);
+				foreach ($usersTmp as $uid => $userDisplayName) {
+					$users[$uid] = $userDisplayName;
+				}
+			}
+		} else {
+			// Search in all users
+			$usersTmp = $this->userManager->searchDisplayName($search, $limit, $offset);
+
+			foreach ($usersTmp as $user) {
+				$users[$user->getUID()] = $user->getDisplayName();
+			}
+		}
+
+		if (!$this->shareeEnumeration || sizeof($users) < $limit) {
+			$hasMoreResults = true;
+		}
+
+		$foundUserById = false;
+		$lowerSearch = strtolower($search);
+		foreach ($users as $uid => $userDisplayName) {
+			if (strtolower($uid) === $lowerSearch || strtolower($userDisplayName) === $lowerSearch) {
+				if (strtolower($uid) === $lowerSearch) {
+					$foundUserById = true;
+				}
+				$result['exact'][] = [
+					'label' => $userDisplayName,
+					'value' => [
+						'shareType' => Share::SHARE_TYPE_USER,
+						'shareWith' => $uid,
+					],
+				];
+			} else {
+				$result['wide'][] = [
+					'label' => $userDisplayName,
+					'value' => [
+						'shareType' => Share::SHARE_TYPE_USER,
+						'shareWith' => $uid,
+					],
+				];
+			}
+		}
+
+		if ($offset === 0 && !$foundUserById) {
+			// On page one we try if the search result has a direct hit on the
+			// user id and if so, we add that to the exact match list
+			$user = $this->userManager->get($search);
+			if ($user instanceof IUser) {
+				$addUser = true;
+
+				if ($this->shareWithGroupOnly) {
+					// Only add, if we have a common group
+					$commonGroups = array_intersect($userGroups, $this->groupManager->getUserGroupIds($user));
+					$addUser = !empty($commonGroups);
+				}
+
+				if ($addUser) {
+					array_push($result['exact'], [
+						'label' => $user->getDisplayName(),
+						'value' => [
+							'shareType' => Share::SHARE_TYPE_USER,
+							'shareWith' => $user->getUID(),
+						],
+					]);
+				}
+			}
+		}
+
+		if (!$this->shareeEnumeration) {
+			$result['wide'] = [];
+		}
+
+		$searchResult->addResultSet('users', $result['wide'], $result['exact']);
+
+		return $hasMoreResults;
+	}
+}