Bugfix: Treat HTTP body as UTF-8.

Author: muukong

src/main/java/com/muukong/burp/BurpWebRpcRequestHandler.java

@@ -47,7 +47,7 @@ public HttpRequest getRequest() {
         if ( !isModified() )
             return request;
 
-        final String data = requestEditor.getContents().toString();
+        final String data = new String(requestEditor.getContents().getBytes(), java.nio.charset.StandardCharsets.UTF_8);
 
         try {
             ProtoParser pp = new ProtoParser(data);
@@ -84,7 +84,7 @@ public void setRequestResponse(HttpRequestResponse httpRequestResponse) {
             grpcWebRequestResponse = GrpcWebRequestResponse.fromGrpcWebProto(body.getBytes());
         }
 
-        requestEditor.setContents(ByteArray.byteArray(grpcWebRequestResponse.prettyPrint()));
+        requestEditor.setContents(ByteArray.byteArray(grpcWebRequestResponse.prettyPrint().getBytes(java.nio.charset.StandardCharsets.UTF_8)));
     }
 
     @Override

src/main/java/com/muukong/burp/BurpWebRpcResponseHandler.java

@@ -49,7 +49,7 @@ public HttpResponse getResponse() {
         if ( !isModified() )
             return response;
 
-        final String data = responseEditor.getContents().toString();
+        final String data = new String(responseEditor.getContents().getBytes(), java.nio.charset.StandardCharsets.UTF_8);
 
         try {
             ProtoParser pp = new ProtoParser(data);
@@ -85,7 +85,7 @@ public void setRequestResponse(HttpRequestResponse httpRequestResponse) {
             grpcWebRequestResponse = GrpcWebRequestResponse.fromGrpcWebProto(response.body().getBytes());
         }
 
-        responseEditor.setContents(ByteArray.byteArray(grpcWebRequestResponse.prettyPrint()));
+        responseEditor.setContents(ByteArray.byteArray(grpcWebRequestResponse.prettyPrint().getBytes(java.nio.charset.StandardCharsets.UTF_8)));
     }
 
     @Override

src/main/java/com/muukong/grpcweb/GrpcWebRequestResponse.java

@@ -127,7 +127,7 @@ private boolean tryDecodeBase64Stream(byte[] grpcWebTextBody) {
                     right = grpcWebTextBody.length;
                 } else { // trailing header
 
-                    String headers = new String(grpcWebProto);
+                    String headers = new String(grpcWebProto, java.nio.charset.StandardCharsets.UTF_8);
                     headers = headers.substring(5, headers.length());
 
 
@@ -223,7 +223,7 @@ private void deserializeGrpcWebProto() {
                 byte[] trailer = new byte[length];
                 System.arraycopy(grpcMessage, cursor, trailer, 0, length);
 
-                String trailerString = new String(trailer);
+                String trailerString = new String(trailer, java.nio.charset.StandardCharsets.UTF_8);
                 for (String header : trailerString.split("\r\n")) {
                     String[] tmp = header.split(":", 2);
                     if ( tmp.length < 2 ) continue;  // skip malformed / empty lines