Channel.pm: Actually deliver channel expressions.

So this is the final part which is needed in order to be able to deliver
custom channels, everything else is now just polishing.

We do this by simply redirecting to the build product download URL and
we use binary_cache_url the same way as in NixChannel.pm.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

src/lib/Hydra/Controller/Channel.pm

@@ -54,4 +54,30 @@ sub overview : Chained('channel') PathPart('') Args(0) {
 }
 
 
+sub nixexprs : Chained('channel') PathPart('') Args(1) {
+    my ($self, $c, $productName) = @_;
+
+    my $product = $c->stash->{lastSuccessful}->buildproducts->find(
+        { type => "channel", name => $productName }
+    );
+
+    my $url = $c->uri_for(
+        $c->controller("Build")->action_for("download"),
+        [$c->stash->{lastSuccessful}->id],
+        $product->productnr,
+        $productName
+    );
+
+    $c->res->redirect($url);
+}
+
+
+sub binary_cache_url : Chained('channel') PathPart('binary-cache-url') Args(0) {
+    my ($self, $c) = @_;
+    $c->stash->{'plain'} = { data => $c->uri_for('/') };
+    $c->response->content_type('text/plain');
+    $c->forward('Hydra::View::Plain');
+}
+
+
 1;