Add router

shadow-cljs.edn

@@ -6,6 +6,7 @@
  [[reagent "0.7.0"]
   [re-frame "0.10.5"]
   [day8.re-frame/http-fx "0.1.6"]
+  [funcool/bide "1.6.0"]
   ;; debugging
   [day8.re-frame/re-frame-10x "0.3.2-react16"]
   ;; for CIDER

src/airsonic_ui/core.cljs

@@ -2,6 +2,8 @@
   (:require [reagent.core :as reagent]
             [re-frame.core :as re-frame]
             [day8.re-frame.http-fx]
+            [bide.core :as r]
+            [airsonic-ui.routes :as routes]
             [airsonic-ui.events :as events]
             [airsonic-ui.views :as views]
             [airsonic-ui.config :as config]))
@@ -11,6 +13,11 @@
     (enable-console-print!)
     (println "dev mode")))
 
+(defn on-navigate
+  [name params query]
+  (println "Route changed to " name params query)
+  (re-frame/dispatch [::events/navigate name params query]))
+
 (defn mount-root []
   (re-frame/clear-subscription-cache!)
   (reagent/render [views/main-panel]
@@ -18,5 +25,7 @@
 
 (defn ^:export init []
   (re-frame/dispatch-sync [::events/initialize-db])
+  (r/start! routes/router {:default ::routes/login
+                           :on-navigate on-navigate})
   (dev-setup)
   (mount-root))

src/airsonic_ui/db.cljs

@@ -1,4 +1,7 @@
-(ns airsonic-ui.db)
+(ns airsonic-ui.db
+  (:require [airsonic-ui.routes :as routes]))
 
 (def default-db
-  {:active-requests 0})
+  {:active-requests 0
+   ;; because navigate! executes asynchronously we force to display the login screen first
+   :route routes/default})

src/airsonic_ui/events.cljs

@@ -1,10 +1,17 @@
 (ns airsonic-ui.events
   (:require [re-frame.core :as re-frame]
             [ajax.core :as ajax]
+            [bide.core :as r]
+            [airsonic-ui.routes :as routes]
             [airsonic-ui.config :as config]
             [airsonic-ui.db :as db]
             [clojure.string :as string]))
 
+
+;; TODO: Remove impurities
+
+;; api related functions
+
 (defn ^:private uri-escape [s]
   (js/encodeURIComponent s))
 
@@ -43,6 +50,8 @@
  ::auth-successful
  (fn [db [_ user pass response]]
    ;; TODO: Handle failures differently
+   ;; TODO: Refactor navigation into effect
+   (r/navigate! routes/router ::routes/main)
    (-> (update db :active-requests dec)
        (assoc :login {:u user
                       :p pass}))))
@@ -53,6 +62,26 @@
    (println "api call gone bad; CORS headers missing? check for :status 0" event)
    db))
 
+;; app interface
+
+(defn authed?
+  "Predicate to determine whether we can access a specific route."
+  [route credentials]
+  (or (not (routes/protected route)) credentials))
+
+(re-frame/reg-event-db
+ ::navigate
+ (fn [db [_ route]]
+   (println "authed?" route (authed? route (:login db)))
+   (if (authed? route (:login db)) 
+     ;; continue to correct page
+     ;; TODO: Fetch data based on route
+     (assoc db :route route)
+     ;; logout and redirect to login
+     (do (re-frame/dispatch [::initialize-db])
+         (r/navigate! routes/router routes/default)
+         db))))
+
 (re-frame/reg-event-db
  ::initialize-db
  (fn [_]

src/airsonic_ui/routes.cljs

@@ -0,0 +1,14 @@
+(ns airsonic-ui.routes
+  (:require [bide.core :as r]))
+
+;; routing is started in core.cljs
+
+(def default ::login)
+
+(def router
+  (r/router [["/" ::login]
+             ["/hello" ::main]]))
+
+;; routes that need valid credentials
+
+(def protected #{::main})

src/airsonic_ui/subs.cljs

@@ -1,7 +1,16 @@
 (ns airsonic-ui.subs
   (:require [re-frame.core :as re-frame]))
 
+;; can be used to query the user's credentials
+
 (re-frame/reg-sub
  ::login
  (fn [db]
    (:login db)))
+
+;; ---
+
+(re-frame/reg-sub
+ ::current-page
+ (fn [db]
+   (:route db)))

src/airsonic_ui/views.cljs

@@ -1,6 +1,7 @@
 (ns airsonic-ui.views
   (:require [re-frame.core :as re-frame]
             [reagent.core :as r]
+            [airsonic-ui.routes :as routes]
             [airsonic-ui.events :as events]
             [airsonic-ui.subs :as subs]))
 
@@ -20,14 +21,16 @@
        [:div
         [:button {:on-click #(re-frame/dispatch [::events/authenticate @user @pass])} "Submit"]]])))
 
-(defn app [user]
+(defn app [current-page]
+  (let [login @(re-frame/subscribe [::subs/login])]
     [:div
-   [:h2 (str "Currently logged in as " user)]
-   [:a {:on-click #(re-frame/dispatch [::events/initialize-db]) :href "#"} "Logout"]])
+     [:h2 (str "Currently logged in as " (:u login))]
+     [:a {:on-click #(re-frame/dispatch [::events/initialize-db]) :href "#"} "Logout"]]))
 
 (defn main-panel []
+  (let [current-page @(re-frame/subscribe [::subs/current-page])]
     [:div
      [:h1 "Airsonic"]
-   (if-let [login @(re-frame/subscribe [::subs/login])]
-     [app (:u login)]
-     [login-form])])
+     (case current-page
+       ::routes/login [login-form]
+       [app current-page])]))