Add basic API endpoints to get server data

http.go

@@ -8,26 +8,61 @@ import (
 	"net/http"
 )
 
-type Router struct {
-	Servers []*server.Server
+type ServerCollection []*server.Server
+
+// Retrieves a server out of the collection by UUID.
+func (sc *ServerCollection) Get(uuid string) *server.Server {
+	for _, s := range *sc {
+		if s.Uuid == uuid {
+			return s
+		}
+	}
+
+	return nil
 }
 
-func (r *Router) routeIndex(w http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
+type Router struct {
+	Servers ServerCollection
+}
+
+// Middleware to protect server specific routes. This will ensure that the server exists and
+// is in a state that allows it to be exposed to the API.
+func (rt *Router) AuthenticateServer(h httprouter.Handle) httprouter.Handle {
+	return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
+		if rt.Servers.Get(ps.ByName("server")) != nil {
+			h(w, r, ps)
+			return
+		}
+
+		http.NotFound(w, r)
+	}
+}
+
+// Returns the basic Wings index page without anything else.
+func (rt *Router) routeIndex(w http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
 	fmt.Fprint(w, "Welcome!\n")
 }
 
-func (r *Router) routeAllServers(w http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
-	enc := json.NewEncoder(w)
-	enc.Encode(r.Servers)
+// Returns all of the servers that exist on the Daemon. This route is only accessible to
+// requests that include an administrative control key, otherwise a 404 is returned. This
+// authentication is handled by a middleware.
+func (rt *Router) routeAllServers(w http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
+	json.NewEncoder(w).Encode(rt.Servers)
 }
 
-func (r *Router) ConfigureRouter() *httprouter.Router {
+// Returns basic information about a single server found on the Daemon.
+func (rt *Router) routeServer(w http.ResponseWriter, _ *http.Request, ps httprouter.Params) {
+	s := rt.Servers.Get(ps.ByName("server"))
+
+	json.NewEncoder(w).Encode(s)
+}
+
+func (rt *Router) ConfigureRouter() *httprouter.Router {
 	router := httprouter.New()
 
-	router.GET("/", r.routeIndex)
-
-	router.GET("/api/servers", r.routeAllServers)
-	// router.GET("/api/servers/:server", r.routeServer)
+	router.GET("/", rt.routeIndex)
+	router.GET("/api/servers", rt.routeAllServers)
+	router.GET("/api/servers/:server", rt.AuthenticateServer(rt.routeServer))
 
 	return router
 }