Add support for 'charset' property for multipart boundaries

- Fixes #2004

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

@@ -59,7 +59,7 @@ public class HttpPostMultipartRequestDecoder implements InterfaceHttpPostRequest
     /**
      * Default charset to use
      */
-    private final Charset charset;
+    private Charset charset;
 
     /**
      * Does the last chunk already received
@@ -193,10 +193,18 @@ public class HttpPostMultipartRequestDecoder implements InterfaceHttpPostRequest
     }
 
     /**
-     * Set from the request ContentType the multipartDataBoundary.
+     * Set from the request ContentType the multipartDataBoundary and the possible charset.
      */
     private void setMultipart(String contentType) {
-        multipartDataBoundary = HttpPostRequestDecoder.getMultipartDataBoundary(contentType);
+        String[] dataBoundary = HttpPostRequestDecoder.getMultipartDataBoundary(contentType);
+        if (dataBoundary != null) {
+            multipartDataBoundary = dataBoundary[0];
+            if (dataBoundary.length > 1 && dataBoundary[1] != null) {
+                charset = Charset.forName(dataBoundary[1]);
+            }
+        } else {
+            multipartDataBoundary = null;
+        }
         currentStatus = MultiPartStatus.HEADERDELIMITER;
     }
 

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

@@ -148,23 +148,40 @@ public class HttpPostRequestDecoder implements InterfaceHttpPostRequestDecoder {
 
     /**
      * Check from the request ContentType if this request is a Multipart request.
-     * @return the multipartDataBoundary if it exists, else null
+     * @return an array of String if multipartDataBoundary exists with the multipartDataBoundary
+     * as first element, charset if any as second (missing if not set), else null
      */
-    protected static String getMultipartDataBoundary(String contentType) {
+    protected static String[] getMultipartDataBoundary(String contentType) {
-        // Check if Post using "multipart/form-data; boundary=--89421926422648"
+        // Check if Post using "multipart/form-data; boundary=--89421926422648 [; charset=xxx]"
         String[] headerContentType = splitHeaderContentType(contentType);
         if (headerContentType[0].toLowerCase().startsWith(
-                HttpHeaders.Values.MULTIPART_FORM_DATA) &&
+                HttpHeaders.Values.MULTIPART_FORM_DATA)) {
-                headerContentType[1].toLowerCase().startsWith(
+            int mrank = 1, crank = 2;
-                        HttpHeaders.Values.BOUNDARY)) {
+            if (headerContentType[1].toLowerCase().startsWith(
-            String[] boundary = StringUtil.split(headerContentType[1], '=');
+                    HttpHeaders.Values.BOUNDARY)) {
+                mrank = 1;
+                crank = 2;
+            } else if (headerContentType[2].toLowerCase().startsWith(
+                    HttpHeaders.Values.BOUNDARY)) {
+                mrank = 2;
+                crank = 1;
+            } else {
+                return null;
+            }
+            String[] boundary = StringUtil.split(headerContentType[mrank], '=');
             if (boundary.length != 2) {
                 throw new ErrorDataDecoderException("Needs a boundary value");
             }
-            return "--" + boundary[1];
+            if (headerContentType[crank].toLowerCase().startsWith(
-        } else {
+                    HttpHeaders.Values.CHARSET)) {
-            return null;
+                String[] charset = StringUtil.split(headerContentType[crank], '=');
+                if (charset.length > 1) {
+                    return new String[] {"--" + boundary[1], charset[1]};
+                }
+            }
+            return new String[] {"--" + boundary[1]};
         }
+        return null;
     }
 
     @Override
@@ -228,26 +245,37 @@ public class HttpPostRequestDecoder implements InterfaceHttpPostRequestDecoder {
     }
 
     /**
-     * Split the very first line (Content-Type value) in 2 Strings
+     * Split the very first line (Content-Type value) in 3 Strings
      *
-     * @return the array of 2 Strings
+     * @return the array of 3 Strings
      */
     private static String[] splitHeaderContentType(String sb) {
         int aStart;
         int aEnd;
         int bStart;
         int bEnd;
+        int cStart;
+        int cEnd;
         aStart = HttpPostBodyUtil.findNonWhitespace(sb, 0);
         aEnd =  sb.indexOf(';');
         if (aEnd == -1) {
-            return new String[] { sb, "" };
+            return new String[] { sb, "", "" };
         }
+        bStart = HttpPostBodyUtil.findNonWhitespace(sb, aEnd + 1);
         if (sb.charAt(aEnd - 1) == ' ') {
             aEnd--;
         }
-        bStart = HttpPostBodyUtil.findNonWhitespace(sb, aEnd + 1);
+        bEnd =  sb.indexOf(';', bStart);
-        bEnd = HttpPostBodyUtil.findEndOfString(sb);
+        if (bEnd == -1) {
-        return new String[] { sb.substring(aStart, aEnd), sb.substring(bStart, bEnd) };
+            bEnd = HttpPostBodyUtil.findEndOfString(sb);
+            return new String[] { sb.substring(aStart, aEnd), sb.substring(bStart, bEnd), "" };
+        }
+        cStart = HttpPostBodyUtil.findNonWhitespace(sb, bEnd + 1);
+        if (sb.charAt(bEnd - 1) == ' ') {
+            bEnd--;
+        }
+        cEnd = HttpPostBodyUtil.findEndOfString(sb);
+        return new String[] { sb.substring(aStart, aEnd), sb.substring(bStart, bEnd), sb.substring(cStart, cEnd) };
     }
 
     /**