Preserve the original filename when encoding a multipart/form in mixe…

…d mode. (#9270)

Motivation:

The HttpPostRequestEncoder overwrites the original filename of file uploads sharing the same name encoded in mixed mode when it rewrites the multipart body header of the previous file. The original filename should be preserved instead.

Modifications:

Change the HttpPostRequestEncoder to reuse the correct filename when the encoder switches to mixed mode. The original test is incorrect and has been modified too, in addition it tests with an extra file upload since the current test was not testing the continuation of a mixed mode.

Result:

The HttpPostRequestEncoder will preserve the original filename of the first fileupload when switching to mixed mode

codec-http/src/main/java/io/netty/handler/codec/http/multipart/HttpPostRequestEncoder.java

@@ -636,7 +636,7 @@ public void addBodyHttpData(InterfaceHttpData data) throws ErrorDataEncoderExcep
                         replacement.append("; ")
                                    .append(HttpHeaderValues.FILENAME)
                                    .append("=\"")
-                                   .append(fileUpload.getFilename())
+                                   .append(currentFileUpload.getFilename())
                                    .append('"');
                     }
 

codec-http/src/test/java/io/netty/handler/codec/http/multipart/HttpPostRequestEncoderTest.java

@@ -138,9 +138,11 @@ public void testMultiFileUploadInMixedMode() throws Exception {
         HttpPostRequestEncoder encoder = new HttpPostRequestEncoder(request, true);
         File file1 = new File(getClass().getResource("/file-01.txt").toURI());
         File file2 = new File(getClass().getResource("/file-02.txt").toURI());
+        File file3 = new File(getClass().getResource("/file-03.txt").toURI());
         encoder.addBodyAttribute("foo", "bar");
         encoder.addBodyFileUpload("quux", file1, "text/plain", false);
         encoder.addBodyFileUpload("quux", file2, "text/plain", false);
+        encoder.addBodyFileUpload("quux", file3, "text/plain", false);
 
         // We have to query the value of these two fields before finalizing
         // the request, which unsets one of them.
@@ -159,7 +161,7 @@ public void testMultiFileUploadInMixedMode() throws Exception {
                 CONTENT_TYPE + ": multipart/mixed; boundary=" + multipartMixedBoundary + "\r\n" +
                 "\r\n" +
                 "--" + multipartMixedBoundary + "\r\n" +
-                CONTENT_DISPOSITION + ": attachment; filename=\"file-02.txt\"" + "\r\n" +
+                CONTENT_DISPOSITION + ": attachment; filename=\"file-01.txt\"" + "\r\n" +
                 CONTENT_LENGTH + ": " + file1.length() + "\r\n" +
                 CONTENT_TYPE + ": text/plain" + "\r\n" +
                 CONTENT_TRANSFER_ENCODING + ": binary" + "\r\n" +
@@ -174,6 +176,14 @@ public void testMultiFileUploadInMixedMode() throws Exception {
                 "\r\n" +
                 "File 02" + StringUtil.NEWLINE +
                 "\r\n" +
+                "--" + multipartMixedBoundary + "\r\n" +
+                CONTENT_DISPOSITION + ": attachment; filename=\"file-03.txt\"" + "\r\n" +
+                CONTENT_LENGTH + ": " + file3.length() + "\r\n" +
+                CONTENT_TYPE + ": text/plain" + "\r\n" +
+                CONTENT_TRANSFER_ENCODING + ": binary" + "\r\n" +
+                "\r\n" +
+                "File 03" + StringUtil.NEWLINE +
+                "\r\n" +
                 "--" + multipartMixedBoundary + "--" + "\r\n" +
                 "--" + multipartDataBoundary + "--" + "\r\n";
 

codec-http/src/test/resources/file-03.txt

@@ -0,0 +1 @@
+File 03