[UNDERTOW-2319] Move io.undertow.multipart.minsize property to Undert…

…owOptions

core/src/main/java/io/undertow/UndertowOptions.java

@@ -443,6 +443,20 @@ public class UndertowOptions {
      */
     public static final Option<Integer> MAX_RST_FRAMES_PER_WINDOW = Option.simple(UndertowOptions.class, "MAX_RST_STREAMS_PER_TIME_WINDOW", Integer.class);
 
+    /**
+     * Proposed default minimum size for storing content in memory before persisting to disk.
+     * The default value for {@code MEMORY_STORAGE_THRESHOLD} is 16 KB (16384 bytes).
+     */
+    public static final long DEFAULT_MEMORY_STORAGE_THRESHOLD = 0x4000;
+
+    /**
+     * The minimum size in bytes for storing content in memory before persisting to disk. If the file content exceeds
+     * the specified <i>file size threshold</i> and the <i>filename</i> is not specified in the form, the content will be stored
+     * in memory as long as its size is less than or equal to this minimum size, after which it will be persisted to disk.
+     */
+    public static final Option<Long> MEMORY_STORAGE_THRESHOLD = Option.simple(UndertowOptions.class, "MEMORY_STORAGE_THRESHOLD", Long.class);
+
+
     /**
      * Configure a read timeout for a web socket, in milliseconds. If its present it will override {@link org.xnio.Options.READ_TIMEOUT}. If the given amount of time elapses without
      * a successful read taking place, the socket's next read will throw a {@link ReadTimeoutException}.

core/src/main/java/io/undertow/server/handlers/form/MultiPartParserDefinition.java

@@ -82,7 +82,7 @@ public class MultiPartParserDefinition implements FormParserFactory.ParserDefini
      * The threshold of form field size to persist to disk.
      * It takes effect only for the form fields which do not have <i>filename</i> specified.
      */
-    private long fieldSizeThreshold = MINSIZE;
+    private long fieldSizeThreshold;
 
     public MultiPartParserDefinition() {
         tempFileLocation = Paths.get(System.getProperty("java.io.tmpdir"));
@@ -101,6 +101,7 @@ public FormDataParser create(final HttpServerExchange exchange) {
                 UndertowLogger.REQUEST_LOGGER.debugf("Could not find boundary in multipart request with ContentType: %s, multipart data will not be available", mimeType);
                 return null;
             }
+            fieldSizeThreshold = exchange.getConnection().getUndertowOptions().get(UndertowOptions.MEMORY_STORAGE_THRESHOLD, UndertowOptions.DEFAULT_MEMORY_STORAGE_THRESHOLD);
             final MultiPartUploadHandler parser = new MultiPartUploadHandler(exchange, boundary, maxIndividualFileSize, fileSizeThreshold, defaultEncoding, fieldSizeThreshold);
             exchange.addExchangeCompleteListener(new ExchangeCompletionListener() {
                 @Override