Hi
I am working at a project (AEM 6.2) where the customer is used Portlets.
These are legacy portlets and have very long query strings. The previous
deployment used some features of the web server that hide that query string.
In AEM 6.0 I created a link rewriter / filter that took the query string,
placed it
into the session and returned a query string with a reference to the session
cache.
On the returning call (action / render) the query string was the re-applied to
the
Servlet Request by wrapping the request and returning the new / old query
string.
Now In AEM 6.2 that fails and I figured out that:
1) The ParameterSupport class is obtaining the values from the request in this
method:
private ParameterMap getRequestParameterMapInternal() {
if (this.postParameterMap == null) {
(line 221 in org.apache.sling.engine 2.4.6)
2) AEM 6.2 does obtain the first parameter from the request on the
HTTPAuthHandler.forceAuthentication()
and therefore fixes all the variables. This handler is called way before my
filter and so any changes made
by this filter is disregarded.
I could circumvent that by intercepting the request for the
“org.apache.sling.engine.impl.parameters.ParameterSupport”
attribute with which I was finally able to call the portlet.
From what I see the code is fine but the method:
public static ParameterSupport getInstance(HttpServletRequest request) {
Object instance = request.getAttribute(ATTR_NAME);
if (!(instance instanceof ParameterSupport)) {
instance = new ParameterSupport(request);
request.setAttribute(ATTR_NAME, instance);
}
return (ParameterSupport) instance;
}
Should also check if the Parameter Support instance is based off the same
request and recreated it. Something like
this:
public static ParameterSupport getInstance(HttpServletRequest request) {
Object instance = request.getAttribute(ATTR_NAME);
if (!(instance instanceof ParameterSupport)) {
instance = new ParameterSupport(request);
request.setAttribute(ATTR_NAME, instance);
} else {
ParameterSupport found = (ParameterSupport) instance;
if(request != found.getServletRequest) {
instance = new ParameterSupport(request);
request.setAttribute(ATTR_NAME, instance);
}
return (ParameterSupport) instance;
}
Cheers - Andy Schaefer
