Add getOwner() method to FileInfo and Node API

lib/private/files/fileinfo.php

@@ -54,6 +54,11 @@ class FileInfo implements \OCP\Files\FileInfo, \ArrayAccess {
 	 */
 	private $mount;
 
+	/**
+	 * @var string
+	 */
+	private $owner;
+
 	/**
 	 * @param string|boolean $path
 	 * @param Storage\Storage $storage
@@ -267,4 +272,13 @@ public function isMounted() {
 	public function getMountPoint() {
 		return $this->mount;
 	}
+
+	public function getOwner() {
+		if ($this->owner) {
+			return $this->owner;
+		}
+
+		$this->owner = $this->storage->getOwner($this->internalPath);
+		return $this->owner;
+	}
 }

lib/private/files/node/node.php

@@ -347,4 +347,8 @@ public function isEncrypted() {
 	public function getMountPoint() {
 		return $this->getFileInfo()->getMountPoint();
 	}
+
+	public function getOwner() {
+		return $this->getFileInfo()->getOwner();
+	}
 }

lib/public/files/fileinfo.php

@@ -229,4 +229,12 @@ public function isMounted();
 	 * @since 8.0.0
 	 */
 	public function getMountPoint();
+
+	/**
+	 * Get owner
+	 *
+	 * @since 9.0.0
+	 */
+	public function getOwner();
+
 }

lib/public/files/node.php

@@ -225,4 +225,12 @@ public function getParent();
 	 * @since 6.0.0
 	 */
 	public function getName();
+
+	/**
+	 * Get the file owner
+	 *
+	 * @since 9.0.0
+	 * @return string
+	 */
+	public function getOwner();
 }

lib/public/files/storage.php

@@ -462,4 +462,10 @@ public function getAvailability();
 	 * @param bool $isAvailable
 	 */
 	public function setAvailability($isAvailable);
+
+	/**
+	 * @param $path path for which to retrieve the owner
+	 * @since 9.0.0
+	 */
+	public function getOwner($path);
 }