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POHow to add a filter in in the "middle of the URL" using Restlet?
 

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  1. POHow to add a filter in in the "middle of the URL" using Restlet?
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    <p>I have the following routes:</p> <p><code>/projects/{projectName}</code></p> <p>and </p> <p><code>/projects/{projectName}/Wall/{wallName}</code></p> <p>Now I'd like to have that all GETs be allowed but PUT, POST, DELETE should only be allowed by project members i.e. users members of that project. I have a special class that given a user id and project name I can get the status of the user's membership - something like <code>MyEnroler.getRole(userId, projectName)</code> - where the userId is part of the request header and the <code>projectName</code> is taken from the URI. </p> <p>I've tried a number of things but doesn't work. Here's the idea:</p> <pre><code>public class RoleMethodAuthorizer extends Authorizer { @Override protected boolean authorize(Request req, Response resp) { //If it's a get request then no need for further authorization. if(req.getMethod().equals(Method.GET)) return true; else { String authorEmail = req.getClientInfo().getUser().getIdentifier(); String projectName = req.getAttributes().get("project").toString(); Role userRole = MyEnroler.getRole(authorEmail, projectName); //forbid updates to resources if done by non-members of project if(userRole.equals(MyEnroler.NON_MEMBER)) return false; //for everybody else, return true return true; } } } </code></pre> <p>Now simply doing the following completely fails when creating inbound root in the Application:</p> <pre><code>Router projectRouter = new Router(getContext()); RoleMethodAuthorizer rma = new RoleMethodAuthorizer(); //Guard declaration here. Then setNext Restlet guard.setNext(projectRouter); projectRouter.attach("/projects/{project}",rma); Router wallRouter = new Router(getContext()); wallRouter.attach("/Wall/{wallName}", WallResource.class); rma.setNext(wallRouter); //return guard; </code></pre> <p>So a request to <code>/projects/stackoverflow/Wall/restlet</code> fails. The URL is never found. I'm guessing since it's trying to match it with the <code>projectRouter</code>. Well I tried the various modes (<code>MODE_BEST_MATCH or MODE_FIRST/NEXT_MATCH</code>) to no avail.</p> <p>Nothing seems to work. Conceptually this should work. I'm only intercepting a call and just being transparent to the request, but don't know how things are working on the inside.</p> <p>I could move the authorizer just after the guard, but I'd lose access to the <code>request attribute</code> of <code>projectName</code> - I don't wish to parse the URL myself to search for the projectName since the URL pattern could change and would break the functionality - i.e. require 2 changes instead of one.</p> <p>Any ideas how to achieve this?</p>
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