app: implement login and authorization

app/src/app.rs

@@ -1,20 +1,60 @@
+use crate::login::LoginForm;
 use crate::user_table::UserTable;
+use anyhow::{anyhow, Result};
+use wasm_bindgen::JsCast;
 use yew::prelude::*;
 
-pub struct App {}
+pub struct App {
+    link: ComponentLink<Self>,
+    user_name: Option<String>,
+}
 
-pub enum Msg {}
+pub enum Msg {
+    Login(String),
+}
+
+fn extract_user_id_cookie() -> Result<String> {
+    let document = web_sys::window()
+        .unwrap()
+        .document()
+        .unwrap()
+        .dyn_into::<web_sys::HtmlDocument>()
+        .unwrap();
+    let cookies = document.cookie().unwrap();
+    yew::services::ConsoleService::info(&cookies);
+    cookies
+        .split(";")
+        .filter_map(|c| c.split_once('='))
+        .map(|(name, value)| {
+            if name == "user_id" {
+                Ok(value.into())
+            } else {
+                Err(anyhow!("Wrong cookie"))
+            }
+        })
+        .filter(Result::is_ok)
+        .next()
+        .unwrap_or(Err(anyhow!("User ID cookie not found in response")))
+}
 
 impl Component for App {
     type Message = Msg;
     type Properties = ();
 
-    fn create(_: Self::Properties, _link: ComponentLink<Self>) -> Self {
-        App {}
+    fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
+        App {
+            link: link.clone(),
+            user_name: extract_user_id_cookie().ok(),
+        }
     }
 
-    fn update(&mut self, _msg: Self::Message) -> ShouldRender {
-        false
+    fn update(&mut self, msg: Self::Message) -> ShouldRender {
+        match msg {
+            Msg::Login(user_name) => {
+                self.user_name = Some(user_name);
+            }
+        }
+        true
     }
 
     fn change(&mut self, _: Self::Properties) -> ShouldRender {
@@ -25,7 +65,11 @@ impl Component for App {
         html! {
             <div>
                 <h1>{ "LLDAP" }</h1>
-                <UserTable />
+                {if self.user_name.is_some() {
+                    html! {<UserTable />}
+                } else {
+                    html! {<LoginForm on_logged_in=self.link.callback(|u| { Msg::Login(u) })/>}
+                }}
             </div>
         }
     }