feat: implement auth callback page

This page will allow users to redirect to their previous path when they sign in.

src/pages/unauthenticated_page.rs

@@ -2,35 +2,43 @@ use crate::components::ActionButton;
 use leptos::logging::log;
 use leptos::prelude::*;
 use leptos_oidc::AuthSignal;
+use leptos_router::hooks::{use_navigate, use_location};
 
 #[component]
 pub fn UnauthenticatedPage() -> impl IntoView {
     let auth = use_context::<AuthSignal>().expect("AuthSignal not present in LoginLink");
-    let login_url = move || {
+    let login_url = Memo::new(move |_| {
         auth.with(|auth| {
             auth.unauthenticated()
                 .map(|unauthenticated| unauthenticated.login_url())
         })
+    });
+    
+    Effect::new(move || log!("Generated login url: {:?}", login_url.get()));
+
+    let navigate = use_navigate();
+    let location = use_location();
+    
+    let on_click = move |_| {
+        let current_path = location.pathname.get();
+        
+        let storage_opt = window().session_storage().ok().flatten();
+        if let Some(session_storage) = storage_opt {
+            let _ = session_storage.set_item("post_login_path", &current_path);
+        }
+        if let Some(url) = login_url.get() {
+            navigate(&url, Default::default())
+        }
     };
 
-    Effect::new(move || log!("Generated login url: {:?}", login_url()));
-
-    let navigate = leptos_router::hooks::use_navigate();
-
-    view! (
+    view! {
         <div class="flex h-screen justify-center items-center pb-50">
             <div class="bg-white p-8 border rounded-lg shadow-lg">
-                <h3> "You're not signed in. Please sign in with your Region 15 email." </h3>
+                <h3>"You're not signed in. Please sign in with your Region 15 email."</h3>
                 <div class="flex pt-4 justify-center items-center">
-                    <ActionButton on:click=move |_| {
-                        if let Some(url) = login_url() {
-                            navigate(&url, Default::default())
-                        }
-                    }>
-                        "Sign in"
-                    </ActionButton>
+                    <ActionButton on:click=on_click>"Sign in"</ActionButton>
                 </div>
             </div>
         </div>
-    )
+    }
 }