Show the path relative to the requesting user (#25067)

A share can only be requested by 3 'types' of people

* owner
* initiator
* recipient

So we have to get the path as the current user. Since that is the only
path that has any meaning to the user.

- Fixed tests

apps/files_sharing/api/share20ocs.php

@@ -103,8 +103,16 @@ class Share20OCS {
 			'displayname_file_owner' => $shareOwner !== null ? $shareOwner->getDisplayName() : $share->getShareOwner(),
 		];
 
-		$node = $share->getNode();
-		$result['path'] = $this->rootFolder->getUserFolder($share->getShareOwner())->getRelativePath($node->getPath());
+		$userFolder = $this->rootFolder->getUserFolder($this->currentUser->getUID());
+		$nodes = $userFolder->getById($share->getNodeId());
+
+		if (empty($nodes)) {
+			throw new NotFoundException();
+		}
+
+		$node = $nodes[0];
+		$result['path'] = $userFolder->getRelativePath($node->getPath());
+
 		if ($node instanceOf \OCP\Files\Folder) {
 			$result['item_type'] = 'folder';
 		} else {

apps/files_sharing/tests/api/share20ocstest.php

@@ -378,8 +378,12 @@ class Share20OCSTest extends \Test\TestCase {
 			->method('getRelativePath')
 			->will($this->returnArgument(0));
 
+		$userFolder->method('getById')
+			->with($share->getNodeId())
+			->willReturn([$share->getNode()]);
+
 		$this->rootFolder->method('getUserFolder')
-			->with($share->getShareOwner())
+			->with($this->currentUser->getUID())
 			->willReturn($userFolder);
 
 		$this->urlGenerator
@@ -1869,8 +1873,19 @@ class Share20OCSTest extends \Test\TestCase {
 			->willReturn('myLink');
 
 
-		$this->rootFolder->method('getUserFolder')->with($share->getShareOwner())->will($this->returnSelf());
-		$this->rootFolder->method('getRelativePath')->will($this->returnArgument(0));
+		$this->rootFolder->method('getUserFolder')
+			->with($this->currentUser->getUID())
+			->will($this->returnSelf());
+
+		if (!$exception) {
+			$this->rootFolder->method('getById')
+				->with($share->getNodeId())
+				->willReturn([$share->getNode()]);
+
+			$this->rootFolder->method('getRelativePath')
+				->with($share->getNode()->getPath())
+				->will($this->returnArgument(0));
+		}
 
 		try {
 			$result = $this->invokePrivate($this->ocs, 'formatShare', [$share]);