Implement logout

Also introduce a library to handle cookies

app/src/api.rs

@@ -1,6 +1,6 @@
+use crate::cookies::set_cookie;
 use anyhow::{anyhow, Result};
 use lldap_model::*;
-use wasm_bindgen::JsCast;
 
 use yew::callback::Callback;
 use yew::format::Json;
@@ -30,19 +30,17 @@ impl HostService {
         let url = "/api/users";
         let handler = move |response: Response<Result<String>>| {
             let (meta, maybe_data) = response.into_parts();
-            match maybe_data {
-                Ok(data) => {
+            let message = maybe_data
+                .map_err(|e| anyhow!("Could not fetch: {}", e))
+                .and_then(|data| {
                     if meta.status.is_success() {
-                        callback.emit(
                         serde_json::from_str(&data)
-                                .map_err(|e| anyhow!("Could not parse response: {}", e)),
-                        )
+                            .map_err(|e| anyhow!("Could not parse response: {}", e))
                     } else {
-                        callback.emit(Err(anyhow!("[{}]: {}", meta.status, data)))
-                    }
-                }
-                Err(e) => callback.emit(Err(anyhow!("Could not fetch: {}", e))),
+                        Err(anyhow!("[{}]: {}", meta.status, data))
                     }
+                });
+            callback.emit(message)
         };
         let request = Request::post(url)
             .header("Content-Type", "application/json")
@@ -57,43 +55,28 @@ impl HostService {
         let url = "/api/authorize";
         let handler = move |response: Response<Result<String>>| {
             let (meta, maybe_data) = response.into_parts();
-            match maybe_data {
-                Ok(data) => {
+            let message = maybe_data
+                .map_err(|e| anyhow!("Could not reach authentication server: {}", e))
+                .and_then(|data| {
                     if meta.status.is_success() {
-                        match get_claims_from_jwt(&data) {
-                            Ok(jwt_claims) => {
-                                let document = web_sys::window()
-                                    .unwrap()
-                                    .document()
-                                    .unwrap()
-                                    .dyn_into::<web_sys::HtmlDocument>()
-                                    .unwrap();
-                                document
-                                    .set_cookie(&format!(
-                                        "user_id={}; expires={}",
-                                        &jwt_claims.user, &jwt_claims.exp
-                                    ))
-                                    .unwrap();
-                                callback.emit(Ok(jwt_claims.user.clone()))
-                            }
-                            Err(e) => {
-                                callback.emit(Err(anyhow!("Could not parse response: {}", e)))
-                            }
-                        }
+                        get_claims_from_jwt(&data)
+                            .map_err(|e| anyhow!("Could not parse response: {}", e))
+                            .and_then(|jwt_claims| {
+                                set_cookie("user_id", &jwt_claims.user, &jwt_claims.exp)
+                                    .map(|_| jwt_claims.user.clone())
+                                    .map_err(|e| anyhow!("Error clearing cookie: {}", e))
+                            })
                     } else if meta.status == 401 {
-                        callback.emit(Err(anyhow!("Invalid username or password")))
+                        Err(anyhow!("Invalid username or password"))
                     } else {
-                        callback.emit(Err(anyhow!(
+                        Err(anyhow!(
                             "Could not authenticate: [{}]: {}",
                             meta.status,
                             data
-                        )))
-                    }
-                }
-                Err(e) => {
-                    callback.emit(Err(anyhow!("Could not reach authentication server: {}", e)))
-                }
+                        ))
                     }
+                });
+            callback.emit(message)
         };
         let request = Request::post(url)
             .header("Content-Type", "application/json")

app/src/app.rs

@@ -1,8 +1,9 @@
+use crate::cookies::get_cookie;
 use crate::login::LoginForm;
+use crate::logout::LogoutButton;
 use crate::user_table::UserTable;
-use anyhow::{anyhow, Result};
-use wasm_bindgen::JsCast;
 use yew::prelude::*;
+use yew::services::ConsoleService;
 
 pub struct App {
     link: ComponentLink<Self>,
@@ -11,30 +12,7 @@ pub struct App {
 
 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")))
+    Logout,
 }
 
 impl Component for App {
@@ -44,7 +22,10 @@ impl Component for App {
     fn create(_: Self::Properties, link: ComponentLink<Self>) -> Self {
         App {
             link: link.clone(),
-            user_name: extract_user_id_cookie().ok(),
+            user_name: get_cookie("user_id").unwrap_or_else(|e| {
+                ConsoleService::error(&e.to_string());
+                None
+            }),
         }
     }
 
@@ -53,6 +34,9 @@ impl Component for App {
             Msg::Login(user_name) => {
                 self.user_name = Some(user_name);
             }
+            Msg::Logout => {
+                self.user_name = None;
+            }
         }
         true
     }
@@ -66,9 +50,14 @@ impl Component for App {
             <div>
                 <h1>{ "LLDAP" }</h1>
                 {if self.user_name.is_some() {
-                    html! {<UserTable />}
+                    html! {
+                      <div>
+                        <LogoutButton on_logged_out=self.link.callback(|_| Msg::Logout) />
+                        <UserTable />
+                      </div>
+                    }
                 } else {
-                    html! {<LoginForm on_logged_in=self.link.callback(|u| { Msg::Login(u) })/>}
+                    html! {<LoginForm on_logged_in=self.link.callback(|u| Msg::Login(u))/>}
                 }}
             </div>
         }

app/src/cookies.rs

@@ -0,0 +1,52 @@
+use anyhow::{anyhow, Result};
+use chrono::prelude::*;
+use wasm_bindgen::JsCast;
+use web_sys::HtmlDocument;
+
+fn get_document() -> Result<HtmlDocument> {
+    web_sys::window()
+        .map(|w| w.document())
+        .flatten()
+        .ok_or(anyhow!("Could not get window document"))
+        .and_then(|d| {
+            d.dyn_into::<web_sys::HtmlDocument>()
+                .map_err(|_| anyhow!("Document is not an HTMLDocument"))
+        })
+}
+
+pub fn set_cookie(cookie_name: &str, value: &str, expiration: &DateTime<Utc>) -> Result<()> {
+    let doc = web_sys::window()
+        .map(|w| w.document())
+        .flatten()
+        .ok_or(anyhow!("Could not get window document"))
+        .and_then(|d| {
+            d.dyn_into::<web_sys::HtmlDocument>()
+                .map_err(|_| anyhow!("Document is not an HTMLDocument"))
+        })?;
+    doc.set_cookie(&format!("{}={};expires={}", cookie_name, value, expiration))
+        .map_err(|_| anyhow!("Could not set cookie"))
+}
+
+pub fn get_cookie(cookie_name: &str) -> Result<Option<String>> {
+    let cookies = get_document()?
+        .cookie()
+        .map_err(|_| anyhow!("Could not access cookies"))?;
+    Ok(cookies
+        .split(";")
+        .filter_map(|c| c.split_once('='))
+        .find_map(|(name, value)| {
+            if name == cookie_name {
+                Some(value.to_string())
+            } else {
+                None
+            }
+        }))
+}
+
+pub fn delete_cookie(cookie_name: &str) -> Result<()> {
+    if let Some(_) = get_cookie(cookie_name)? {
+        set_cookie(cookie_name, "", &Utc.ymd(1970, 1, 1).and_hms(0, 0, 0))
+    } else {
+        Ok(())
+    }
+}

app/src/lib.rs

@@ -1,7 +1,9 @@
 #![recursion_limit = "256"]
 mod api;
 mod app;
+mod cookies;
 mod login;
+mod logout;
 mod user_table;
 
 use wasm_bindgen::prelude::{wasm_bindgen, JsValue};

app/src/logout.rs

@@ -0,0 +1,54 @@
+use crate::cookies::delete_cookie;
+use yew::prelude::*;
+use yew::services::ConsoleService;
+
+pub struct LogoutButton {
+    link: ComponentLink<Self>,
+    on_logged_out: Callback<()>,
+}
+
+#[derive(Clone, PartialEq, Properties)]
+pub struct Props {
+    pub on_logged_out: Callback<()>,
+}
+
+pub enum Msg {
+    Logout,
+}
+
+impl Component for LogoutButton {
+    type Message = Msg;
+    type Properties = Props;
+
+    fn create(props: Self::Properties, link: ComponentLink<Self>) -> Self {
+        LogoutButton {
+            link: link.clone(),
+            on_logged_out: props.on_logged_out,
+        }
+    }
+
+    fn update(&mut self, msg: Self::Message) -> ShouldRender {
+        match msg {
+            Msg::Logout => match delete_cookie("user_id") {
+                Err(e) => {
+                    ConsoleService::error(&e.to_string());
+                    false
+                }
+                Ok(()) => {
+                    self.on_logged_out.emit(());
+                    true
+                }
+            },
+        }
+    }
+
+    fn change(&mut self, _: Self::Properties) -> ShouldRender {
+        false
+    }
+
+    fn view(&self) -> Html {
+        html! {
+            <button onclick=self.link.callback(|_| { Msg::Logout })>{"Logout"}</button>
+        }
+    }
+}