1 files changed, 200 insertions, 0 deletions
diff --git a/lib/private/Share20/ShareHelper.php b/lib/private/Share20/ShareHelper.php
new file mode 100644
index 00000000000..3f6bab98a7f
--- /dev/null
+++ b/lib/private/Share20/ShareHelper.php
@@ -0,0 +1,200 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\Share20;
+
+use OCP\Files\InvalidPathException;
+use OCP\Files\Node;
+use OCP\Files\NotFoundException;
+use OCP\Files\NotPermittedException;
+use OCP\Share\IManager;
+use OCP\Share\IShareHelper;
+
+class ShareHelper implements IShareHelper {
+	/** @var IManager */
+	private $shareManager;
+
+	public function __construct(IManager $shareManager) {
+		$this->shareManager = $shareManager;
+	}
+
+	/**
+	 * @param Node $node
+	 * @return array [ users => [Mapping $uid => $pathForUser], remotes => [Mapping $cloudId => $pathToMountRoot]]
+	 */
+	public function getPathsForAccessList(Node $node) {
+		$result = [
+			'users' => [],
+			'remotes' => [],
+		];
+
+		$accessList = $this->shareManager->getAccessList($node, true, true);
+		if (!empty($accessList['users'])) {
+			$result['users'] = $this->getPathsForUsers($node, $accessList['users']);
+		}
+		if (!empty($accessList['remote'])) {
+			$result['remotes'] = $this->getPathsForRemotes($node, $accessList['remote']);
+		}
+
+		return $result;
+	}
+
+	/**
+	 * Sample:
+	 * $users = [
+	 *   'test1' => ['node_id' => 16, 'node_path' => '/foo'],
+	 *   'test2' => ['node_id' => 23, 'node_path' => '/bar'],
+	 *   'test3' => ['node_id' => 42, 'node_path' => '/cat'],
+	 *   'test4' => ['node_id' => 48, 'node_path' => '/dog'],
+	 * ];
+	 *
+	 * Node tree:
+	 * - SixTeen is the parent of TwentyThree
+	 * - TwentyThree is the parent of FortyTwo
+	 * - FortyEight does not exist
+	 *
+	 * $return = [
+	 *   'test1' => '/foo/TwentyThree/FortyTwo',
+	 *   'test2' => '/bar/FortyTwo',
+	 *   'test3' => '/cat',
+	 * ],
+	 *
+	 * @param Node $node
+	 * @param array[] $users
+	 * @return array
+	 */
+	protected function getPathsForUsers(Node $node, array $users) {
+		/** @var array[] $byId */
+		$byId = [];
+		/** @var array[] $results */
+		$results = [];
+
+		foreach ($users as $uid => $info) {
+			if (!isset($byId[$info['node_id']])) {
+				$byId[$info['node_id']] = [];
+			}
+			$byId[$info['node_id']][$uid] = $info['node_path'];
+		}
+
+		try {
+			if (isset($byId[$node->getId()])) {
+				foreach ($byId[$node->getId()] as $uid => $path) {
+					$results[$uid] = $path;
+				}
+				unset($byId[$node->getId()]);
+			}
+		} catch (NotFoundException $e) {
+			return $results;
+		} catch (InvalidPathException $e) {
+			return $results;
+		}
+
+		if (empty($byId)) {
+			return $results;
+		}
+
+		$item = $node;
+		$appendix = '/' . $node->getName();
+		while (!empty($byId)) {
+			try {
+				/** @var Node $item */
+				$item = $item->getParent();
+
+				if (!empty($byId[$item->getId()])) {
+					foreach ($byId[$item->getId()] as $uid => $path) {
+						$results[$uid] = $path . $appendix;
+					}
+					unset($byId[$item->getId()]);
+				}
+
+				$appendix = '/' . $item->getName() . $appendix;
+			} catch (NotFoundException $e) {
+				return $results;
+			} catch (InvalidPathException $e) {
+				return $results;
+			} catch (NotPermittedException $e) {
+				return $results;
+			}
+		}
+
+		return $results;
+	}
+
+	/**
+	 * Sample:
+	 * $remotes = [
+	 *   'test1' => ['node_id' => 16, 'token' => 't1'],
+	 *   'test2' => ['node_id' => 23, 'token' => 't2'],
+	 *   'test3' => ['node_id' => 42, 'token' => 't3'],
+	 *   'test4' => ['node_id' => 48, 'token' => 't4'],
+	 * ];
+	 *
+	 * Node tree:
+	 * - SixTeen is the parent of TwentyThree
+	 * - TwentyThree is the parent of FortyTwo
+	 * - FortyEight does not exist
+	 *
+	 * $return = [
+	 *   'test1' => ['token' => 't1', 'node_path' => '/SixTeen'],
+	 *   'test2' => ['token' => 't2', 'node_path' => '/SixTeen/TwentyThree'],
+	 *   'test3' => ['token' => 't3', 'node_path' => '/SixTeen/TwentyThree/FortyTwo'],
+	 * ],
+	 *
+	 * @param Node $node
+	 * @param array[] $remotes
+	 * @return array
+	 */
+	protected function getPathsForRemotes(Node $node, array $remotes) {
+		/** @var array[] $byId */
+		$byId = [];
+		/** @var array[] $results */
+		$results = [];
+
+		foreach ($remotes as $cloudId => $info) {
+			if (!isset($byId[$info['node_id']])) {
+				$byId[$info['node_id']] = [];
+			}
+			$byId[$info['node_id']][$cloudId] = $info['token'];
+		}
+
+		$item = $node;
+		while (!empty($byId)) {
+			try {
+				if (!empty($byId[$item->getId()])) {
+					$path = $this->getMountedPath($item);
+					foreach ($byId[$item->getId()] as $uid => $token) {
+						$results[$uid] = [
+							'node_path' => $path,
+							'token' => $token,
+						];
+					}
+					unset($byId[$item->getId()]);
+				}
+
+				/** @var Node $item */
+				$item = $item->getParent();
+			} catch (NotFoundException $e) {
+				return $results;
+			} catch (InvalidPathException $e) {
+				return $results;
+			} catch (NotPermittedException $e) {
+				return $results;
+			}
+		}
+
+		return $results;
+	}
+
+	/**
+	 * @param Node $node
+	 * @return string
+	 */
+	protected function getMountedPath(Node $node) {
+		$path = $node->getPath();
+		$sections = explode('/', $path, 4);
+		return '/' . $sections[3];
+	}
+}