Create missing directories in imageuploader tree if they don't alread…

app/code/Magento/Cms/Helper/Wysiwyg/Images.php

@@ -224,8 +224,7 @@ public function getImageHtmlDeclaration($filename, $renderAsTag = false)
     }
 
     /**
-     * Return path of the current selected directory or root directory for startup
-     * Try to create target directory if it doesn't exist
+     * Return path of the root directory for startup. Also try to create target directory if it doesn't exist
      *
      * @return string
      * @throws \Magento\Framework\Exception\LocalizedException
@@ -241,18 +240,34 @@ public function getCurrentPath()
                     $currentPath = $path;
                 }
             }
+
+            $currentTreePath = $this->_getRequest()->getParam('current_tree_path');
+            if ($currentTreePath) {
+                $currentTreePath = $this->convertIdToPath($currentTreePath);
+                $this->createSubDirIfNotExist($currentTreePath);
+            }
+
+            $this->_currentPath = $currentPath;
+        }
+
+        return $this->_currentPath;
+    }
+
+    private function createSubDirIfNotExist(string $absPath)
+    {
+        $relPath = $this->_directory->getRelativePath($absPath);
+        if (!$this->_directory->isExist($relPath)) {
             try {
-                $currentDir = $this->_directory->getRelativePath($currentPath);
-                if (!$this->_directory->isExist($currentDir)) {
-                    $this->_directory->create($currentDir);
-                }
+                $this->_directory->create($relPath);
             } catch (\Magento\Framework\Exception\FileSystemException $e) {
-                $message = __('The directory %1 is not writable by server.', $currentPath);
+                $message = __(
+                    'Can\'t create %1 as subdirectory of %2, you might have some permission issue.',
+                    $relPath,
+                    $this->_directory->getAbsolutePath()
+                );
                 throw new \Magento\Framework\Exception\LocalizedException($message);
             }
-            $this->_currentPath = $currentPath;
         }
-        return $this->_currentPath;
     }
 
     /**
@@ -294,6 +309,8 @@ public function idEncode($string)
     public function idDecode($string)
     {
         $string = strtr($string, ':_-', '+/=');
+
+        // phpcs:ignore Magento2.Functions.DiscouragedFunction
         return base64_decode($string);
     }
 
@@ -315,7 +332,7 @@ public function getShortFilename($filename, $maxLength = 20)
     /**
      * Set user-traversable image directory subpath relative to media directory and relative to nested storage root
      *
-     * @var string $subpath
+     * @param string $subpath
      * @return void
      */
     public function setImageDirectorySubpath($subpath)

app/code/Magento/Cms/Test/Unit/Helper/Wysiwyg/ImagesTest.php

@@ -339,13 +339,14 @@ public function providerIsUsingStaticUrlsAllowed()
      * @param bool $isExist
      * @dataProvider providerGetCurrentPath
      */
-    public function testGetCurrentPath($pathId, $expectedPath, $isExist)
+    public function testGetCurrentPath($pathId, $subDir, $expectedPath, $isExist)
     {
         $this->requestMock->expects($this->any())
             ->method('getParam')
             ->willReturnMap(
                 [
                     ['node', null, $pathId],
+                    ['current_tree_path', null, $subDir],
                 ]
             );
 
@@ -367,21 +368,33 @@ public function testGetCurrentPath($pathId, $expectedPath, $isExist)
                     ['PATH', '.'],
                 ]
             );
-        $this->directoryWriteMock->expects($this->once())
-            ->method('isExist')
-            ->willReturn($isExist);
-        $this->directoryWriteMock->expects($this->any())
-            ->method('create')
-            ->with($this->directoryWriteMock->getRelativePath($expectedPath));
+
+        if ($subDir) {
+            $this->directoryWriteMock->expects($this->once())
+                ->method('isExist')
+                ->willReturn($isExist);
+            $this->directoryWriteMock->expects($this->any())
+                ->method('create')
+                ->with($this->directoryWriteMock->getRelativePath($expectedPath));
+        }
 
         $this->assertEquals($expectedPath, $this->imagesHelper->getCurrentPath());
     }
 
     public function testGetCurrentPathThrowException()
     {
+        $this->requestMock->expects($this->any())
+            ->method('getParam')
+            ->willReturn('PATH');
+
         $this->expectException(\Magento\Framework\Exception\LocalizedException::class);
-        $this->expectExceptionMessage('The directory PATH is not writable by server.');
+        $this->expectExceptionMessage(
+            'Can\'t create SUBDIR as subdirectory of PATH, you might have some permission issue.'
+        );
 
+        $this->directoryWriteMock->expects($this->any())
+            ->method('getRelativePath')
+            ->willReturn('SUBDIR');
         $this->directoryWriteMock->expects($this->once())
             ->method('isExist')
             ->willReturn(false);
@@ -402,12 +415,12 @@ public function testGetCurrentPathThrowException()
     public function providerGetCurrentPath()
     {
         return [
-            ['L3Rlc3RfcGF0aA--', 'PATH/test_path', true],
-            ['L215LmpwZw--', 'PATH', true],
-            [null, 'PATH', true],
-            ['L3Rlc3RfcGF0aA--', 'PATH/test_path', false],
-            ['L215LmpwZw--', 'PATH', false],
-            [null, 'PATH', false],
+            ['L3Rlc3RfcGF0aA--', 'L3Rlc3RfcGF0aA--', 'PATH/test_path', true],
+            ['L215LmpwZw--', '', 'PATH', true],
+            [null, '', 'PATH', true],
+            ['L3Rlc3RfcGF0aA--', 'L3Rlc3RfcGF0aA--', 'PATH/test_path', false],
+            ['L215LmpwZw--', '', 'PATH', false],
+            [null, '', 'PATH', false],
         ];
     }