Fixed FTP and SMB to use rmdir() when deleting folders

Some storages need to use different calls for deleting files or folders,
usually unlink() and rmdir().

Fixes #4532
  
An error occurred
 
 (SMB dir deletion)
Fixes #5941
  
An error occurred
 
 (FTP dir deletion)

Note that the extra is_dir() should be fast because it's read from the
stat cache.

apps/files_external/lib/ftp.php

@@ -61,6 +61,22 @@ class FTP extends \OC\Files\Storage\StreamWrapper{
 		$url.='://'.$this->user.':'.$this->password.'@'.$this->host.$this->root.$path;
 		return $url;
 	}
+
+	/**
+	 * Unlinks file or directory
+	 * @param string @path
+	 */
+	public function unlink($path) {
+		if ($this->is_dir($path)) {
+			return $this->rmdir($path);
+		}
+		else {
+			$url = $this->constructUrl($path);
+			$result = unlink($url);
+			clearstatcache(true, $url);
+			return $result;
+		}
+	}
 	public function fopen($path,$mode) {
 		switch($mode) {
 			case 'r':

apps/files_external/lib/smb.php

@@ -82,12 +82,18 @@ class SMB extends \OC\Files\Storage\StreamWrapper{
 	}
 
 	/**
-	 * Unlinks file
+	 * Unlinks file or directory
 	 * @param string @path
 	 */
 	public function unlink($path) {
-		unlink($this->constructUrl($path));
-		clearstatcache();
+		if ($this->is_dir($path)) {
+			$this->rmdir($path);
+		}
+		else {
+			$url = $this->constructUrl($path);
+			unlink($url);
+			clearstatcache(false, $url);
+		}
 		// smb4php still returns false even on success so
 		// check here whether file was really deleted
 		return !file_exists($path);

apps/files_external/lib/streamwrapper.php

@@ -25,8 +25,9 @@ abstract class StreamWrapper extends Common {
 					$this->unlink($path . '/' . $file);
 				}
 			}
-			$success = rmdir($this->constructUrl($path));
-			clearstatcache();
+			$url = $this->constructUrl($path);
+			$success = rmdir($url);
+			clearstatcache(false, $url);
 			return $success;
 		} else {
 			return false;
@@ -46,8 +47,11 @@ abstract class StreamWrapper extends Common {
 	}
 
 	public function unlink($path) {
-		$success = unlink($this->constructUrl($path));
-		clearstatcache();
+		$url = $this->constructUrl($path);
+		$success = unlink($url);
+		// normally unlink() is supposed to do this implicitly,
+		// but doing it anyway just to be sure
+		clearstatcache(false, $url);
 		return $success;
 	}
 

tests/lib/files/storage/storage.php

@@ -254,7 +254,19 @@ abstract class Storage extends \PHPUnit_Framework_TestCase {
 		$this->instance->mkdir('folder/bar');
 		$this->instance->file_put_contents('folder/asd.txt', 'foobar');
 		$this->instance->file_put_contents('folder/bar/foo.txt', 'asd');
-		$this->instance->rmdir('folder');
+		$this->assertTrue($this->instance->rmdir('folder'));
+		$this->assertFalse($this->instance->file_exists('folder/asd.txt'));
+		$this->assertFalse($this->instance->file_exists('folder/bar/foo.txt'));
+		$this->assertFalse($this->instance->file_exists('folder/bar'));
+		$this->assertFalse($this->instance->file_exists('folder'));
+	}
+
+	public function testRecursiveUnlink() {
+		$this->instance->mkdir('folder');
+		$this->instance->mkdir('folder/bar');
+		$this->instance->file_put_contents('folder/asd.txt', 'foobar');
+		$this->instance->file_put_contents('folder/bar/foo.txt', 'asd');
+		$this->assertTrue($this->instance->unlink('folder'));
 		$this->assertFalse($this->instance->file_exists('folder/asd.txt'));
 		$this->assertFalse($this->instance->file_exists('folder/bar/foo.txt'));
 		$this->assertFalse($this->instance->file_exists('folder/bar'));