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POPlay2.2.x, BodyParser, Authentication, and Future[Result]
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  1. POPlay2.2.x, BodyParser, Authentication, and Future[Result]
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    copied!<p>I'm trying to implement authentication in my Play 2.2.1 app, and I can't quite figure out how to make it work with an action that returns a Future[Result].</p> <p>This post describes pretty close to what I'm trying to do, except without returning Future[Result]: </p> <p><a href="https://stackoverflow.com/questions/11104005/play-2-0-framework-using-a-bodyparser-with-an-authenticated-request">Play 2.0 Framework, using a BodyParser with an authenticated request</a></p> <p>How can I get it to work with Futures? I.e. how would I implement this function:</p> <pre><code>def IsAuthenticated(f: =&gt; String =&gt; Request[Any] =&gt; Future[Result]) </code></pre> <p>or, better yet, this function:</p> <pre><code>def IsAuthenticated[A}(b:BodyParser[A])(f: =&gt; String =&gt; Request[Any] =&gt; Future[Result]) </code></pre> <p>which would feed into this function:</p> <p>def AuthenticatedUser(g: Account => Request[AnyContent] => SimpleResult) = IsAuthenticated {...}</p> <p>to wrap asynchronous actions in my controllers?</p> <p>This part I can do:</p> <pre><code> def IsAuthenticated(f: =&gt; String =&gt; Request[AnyContent] =&gt; Future[SimpleResult]) = { Security.Authenticated(email, onUnauthorized) { user =&gt; Action.async(request =&gt; f(user)(request)) } } </code></pre> <p>But if I try to use IsAuthenticated in my wrapper function:</p> <pre><code> def AuthenticatedUser(g: Account =&gt; Request[AnyContent] =&gt; Future[SimpleResult]) = IsAuthenticated { email =&gt; implicit request =&gt; Account.find(email).map { opt =&gt; opt match { case Some(account) =&gt; g(account)(request) case None =&gt; Future(onUnauthorized(request)) } } } </code></pre> <p>(Account.find returns a Future[Option[Account]] 'cause it's a mongodb call that may take some time. The desire to do the future thing right is what's causing me so much grief now)</p> <p>I can't get AuthenticatedUser to satisfy the compiler. It says it's getting a Future[Future[SimpleResult]] instead of a Future[SimpleResult].</p> <p>So, how best to build this whole thing? I need to be able to make authentication wrappers that rely on db calls that are asynchronous. </p> <p>I'm sure I'm just dense and missing something obvious...</p> <p>EDIT: Here's what I ended up with. Thank you Jean for pointing me in the right direction.</p> <p>I found AuthenticatedController while rooting around and it's pretty close to what I'm looking for. I wanted two types of authentication: User (authenticated user) and Administrator (to wrap code for admin tasks).</p> <pre><code>package controllers import models.Account import play.api.mvc._ import scala.concurrent.Future trait Secured { class AuthenticatedRequest[A](val account: Account, request: Request[A]) extends WrappedRequest[A](request) object User extends ActionBuilder[AuthenticatedRequest] { def invokeBlock[A](request: Request[A], block: (AuthenticatedRequest[A]) =&gt; Future[SimpleResult]) = { request.session.get("email") match { case Some(email) =&gt; { Account.find(email).flatMap { case Some(account) =&gt; { block(new AuthenticatedRequest(account, request)) } case _ =&gt; Future(Results.Redirect(routes.Index.index())) } } case _ =&gt; Future(Results.Redirect(routes.Index.index())) } } } object Administrator extends ActionBuilder[AuthenticatedRequest] { def invokeBlock[A](request: Request[A], block: (AuthenticatedRequest[A]) =&gt; Future[SimpleResult]) = { request.session.get("email") match { case Some(email) =&gt; { Account.find(email).flatMap { case Some(account) =&gt; if (account.admin) { block(new AuthenticatedRequest(account, request)) } else { Future(Results.Redirect(routes.Index.index())) } case _ =&gt; Future(Results.Redirect(routes.Index.index())) } } case _ =&gt; Future(Results.Redirect(routes.Index.index())) } } } } </code></pre>
 

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