[KNOX-884] JavaScript rewrite rule results in encoded text

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.11.0
• Fix Version/s: 0.12.0
• Component/s: Server
• Assignee: Richard Ding
• Reporter: Richard Ding
• Created: 16/Feb/17 00:17
• Updated: 28/Mar/19 14:17
• Resolved: 17/Feb/17 18:50

Description

Hadoop added links to datanode web UI in namenode datanodes page (HDFS-10440 & HDFS-10493) in the form of JavaScript. In Knox we added rewrite rules to map JS text '//

{infoAddr}' to
'https://gateway.host:8443/gateway/default/hdfs/datanode?host={infoAddr}

'.

This works with Knox 0.7. But in Knox 0.11, the same rule results in the encoded query segment:

'https://gateway.host:8443/gateway/default/hdfs/datanode?host=%7BinfoAddr%7D'

and this breaks JavaScript code.

I did some investigation and it seems that the encoding comes from the Expander code:

private static void appendQueryPart(String part, StringBuilder builder) {
   
    try {
      
        builder.append(URLEncoder.encode(part, "UTF-8"));
    
    } catch ( UnsupportedEncodingException e ) {
      
        builder.append(part);
    
    } 
}