Hello!
I am working in a feature about Sling Filters in AEM. I have to intercept a specific URL in AEM, e.g /en-us/abc/folder1 and without modify that URL, forward an asset URL from the DAM folder. The asset exist in the DAM folder at this location: /content/dam/myApp/test.pdf. So here is an approach of this implementation:
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { if (!(request instanceof SlingHttpServletRequest) || !(response instanceof SlingHttpServletResponse)) { // Not a SlingHttpServletRequest/Response, so ignore. chain.doFilter(request, response); // This line would let you // proceed to the rest of the // filters. return; } final SlingHttpServletRequest slingRequest = (SlingHttpServletRequest) request; final SlingHttpServletResponse slingResponse = (SlingHttpServletResponse) response; String tempURI = ""; //some impl here if (matchFound) { tempURI = "/content/dam/app/test.pdf"; RequestDispatcher dispatch = slingRequest.getRequestDispatcher(tempURI); dispatch.forward(slingRequest, slingResponse); return; } chain.doFilter(request, response); }
But the problem is that I get an empty or blank pdf so the asset is not loaded correctly. I tried instead of forwarding an DAM asset go to a URL page and is working good in that case. So, I wonder if the forward method only works for pages (contentType="text/html") and how can I do this by retrieving the asset with that filter ?
Any help will be appreciated!
Thanks
Solved! Go to Solution.
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I checked with some internal Adobe ppl - this was their response:
There is some DAM Asset filter that prevents Forwards from occurring. You *might* be able to bump that up to a Felix Servlet Filter and do something up there (might need to wrap the Request and change the URI, not sure)
Check the ACS AEM Samples page for a Felix Servlet Filter if you want to try it out.
ACS AEM Samples -- http://adobe-consulting-services.github.io/acs-aem-samples/
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We will look at getting an example of this on mon.
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smacdonald2008 wrote...
We will look at getting an example of this on mon.
Hello, have you found something about this ?
Thanks and regards!
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Hello, I tried another scenario to get an idea about the issue that I am facing. And when I do a forward to a image or text URL e.g: en-us/folder1/folder2/test.jpg . I get an "You don't have permission to access to this page. Please contact the Administrator" message, so I wonder if maybe there is something else that is executing before my custom filter. I tried putting a breakpoint and debugging but after the call to
dispatch.forward(slingRequest, slingResponse);
I get always the same error.
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I checked with some internal Adobe ppl - this was their response:
There is some DAM Asset filter that prevents Forwards from occurring. You *might* be able to bump that up to a Felix Servlet Filter and do something up there (might need to wrap the Request and change the URI, not sure)
Check the ACS AEM Samples page for a Felix Servlet Filter if you want to try it out.
ACS AEM Samples -- http://adobe-consulting-services.github.io/acs-aem-samples/
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Can you try with order = -700, // The smaller the number, the earlier in the Filter chain (can go negative);
Its worked for me.
@SlingFilter(generateComponent = true, generateService = true, order = -700, scope = SlingFilterScope.REQUEST)
public class SampleFilter implements Filter {
private Logger logger = LoggerFactory.getLogger(SampleFilter.class);
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
if (!(request instanceof SlingHttpServletRequest)
|| !(response instanceof SlingHttpServletResponse)) {
// Not a SlingHttpServletRequest/Response, so ignore.
chain.doFilter(request, response); // This line would let you
// proceed to the rest of the
// filters.
return;
}
final SlingHttpServletRequest slingRequest = (SlingHttpServletRequest) request;
final SlingHttpServletResponse slingResponse = (SlingHttpServletResponse) response;
String tempURI = "";
// some impl here
logger.info("Inside sample filter {}", slingRequest
.getRequestPathInfo().getResourcePath());
boolean matchFound = false;
if (slingRequest.getRequestPathInfo().getResourcePath()
.contains("/en-us/abc/folder1")) {
matchFound = true;
}
if (matchFound) {
tempURI = "/content/dam/geometrixx/documents/GeoPyramid_Datasheet.pdf";
RequestDispatcher dispatch = slingRequest
.getRequestDispatcher(tempURI);
dispatch.forward(slingRequest, slingResponse);
return;
}
chain.doFilter(request, response);
}
public void destroy() {
}
}
Thanks
Prem
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