MNT-21250: The fix for MNT-20734 introduces a problem whereby files larger than 4MB cannot be downloaded (#516)

- fixed temp file handling issue

src/main/java/org/alfresco/repo/web/scripts/BufferedResponse.java

@@ -262,8 +262,15 @@ public class BufferedResponse implements WrappingWebScriptResponse
                 if (logger.isDebugEnabled())
                     logger.debug("Writing Transactional response: size=" + outputStream.getLength());
 
-                outputStream.flush();
+                try
-                FileCopyUtils.copy(outputStream.getInputStream(), res.getOutputStream());
+                {
+                    outputStream.flush();
+                    FileCopyUtils.copy(outputStream.getInputStream(), res.getOutputStream());
+                }
+                finally
+                {
+                    outputStream.destroy();
+                }
             }
         }
         catch (IOException e)

src/main/java/org/alfresco/rest/framework/webscripts/ApiWebScript.java

@@ -57,7 +57,6 @@ public abstract class ApiWebScript extends AbstractWebScript
     protected int memoryThreshold = 4 * 1024 * 1024; // 4mb
     protected long maxContentSize = (long) 4 * 1024 * 1024 * 1024; // 4gb
     protected TempOutputStreamFactory streamFactory = null;
-    protected TempOutputStreamFactory responseStreamFactory = null;
     protected TransactionService transactionService;
 
     public void setTransactionService(TransactionService transactionService)
@@ -98,7 +97,6 @@ public abstract class ApiWebScript extends AbstractWebScript
     {
         File tempDirectory = TempFileProvider.getTempDir(tempDirectoryName);
         this.streamFactory = new TempOutputStreamFactory(tempDirectory, memoryThreshold, maxContentSize, false, false);
-        this.responseStreamFactory = new TempOutputStreamFactory(tempDirectory, memoryThreshold, maxContentSize, false, true);
     }
 
     @Override

src/test/java/org/alfresco/rest/api/tests/NodeApiTest.java

@@ -2856,6 +2856,12 @@ public class NodeApiTest extends AbstractSingleNetworkSiteTest
         documentResp = RestApiUtil.parseRestApiEntry(response.getJsonResponse(), Document.class);
 
         assertTrue("File size is 0 bytes", documentResp.getContent().getSizeInBytes().intValue() > 0);
+
+        // Download text content - by default with Content-Disposition header
+        response = getSingle(NodesEntityResource.class, docId + "/content", null, 200);
+
+        byte[] bytes = response.getResponseAsBytes();
+        assertEquals(contentSize.intValue(), bytes.length);
     }
 
     private class UpdateNodeRunnable implements Runnable
@@ -3705,6 +3711,57 @@ public class NodeApiTest extends AbstractSingleNetworkSiteTest
         getSingle(getNodeContentUrl(contentNodeId), null, null, headers, 304);
     }
 
+    /**
+     * Tests download of file/content using backed temp file for streaming.
+     * <p>
+     * GET:
+     * </p>
+     * {@literal <host>:<port>/alfresco/api/-default-/public/alfresco/versions/1/nodes/<nodeId>/content}
+     */
+    @Test
+    public void testDownloadFileContentUsingTempFile() throws Exception
+    {
+        setRequestContext(user1);
+
+        // This should be grater then TempOutputStream.DEFAULT_MEMORY_THRESHOLD
+        Long contentSize = 5 * 1024 * 1024L;
+        String fileName = "tempFile.txt";
+
+        File file = null;
+        try
+        {
+            file = TempFileProvider.createTempFile(getClass().getSimpleName(), ".txt");
+            RandomAccessFile rndFile = new RandomAccessFile(file.getPath(), "rw");
+            rndFile.setLength(contentSize);
+            rndFile.close();
+
+            MultiPartBuilder multiPartBuilder = MultiPartBuilder.create().setFileData(new FileData(fileName, file));
+            MultiPartRequest reqBody = multiPartBuilder.build();
+
+            // Upload text content
+            HttpResponse response = post(getNodeChildrenUrl(Nodes.PATH_MY), reqBody.getBody(), null, reqBody.getContentType(), 201);
+            Document document = RestApiUtil.parseRestApiEntry(response.getJsonResponse(), Document.class);
+
+            String contentNodeId = document.getId();
+
+            // Check the upload response
+            assertEquals(fileName, document.getName());
+            ContentInfo contentInfo = document.getContent();
+            assertNotNull(contentInfo);
+            assertEquals(MimetypeMap.MIMETYPE_TEXT_PLAIN, contentInfo.getMimeType());
+
+            // Download text content
+            response = getSingle(NodesEntityResource.class, contentNodeId + "/content", null, 200);
+
+            byte[] bytes = response.getResponseAsBytes();
+            assertEquals(contentSize.intValue(), bytes.length);
+        }
+        finally
+        {
+            file.delete();
+        }
+    }
+
     /**
      * Tests download of file/content - basic read permission
      * <p>GET:</p>