feat(login): Store token in session storage

src/js/main.js

@@ -37,6 +37,22 @@ async function getConfig() {
 }
 
 export async function login() {
+  let token_from_storage = window.sessionStorage.getItem("access_token");
+
+  if(token_from_storage !== null) {
+    let checkResponse = await fetch(config.backend_url + "/token/check", {
+      method: "GET",
+      headers: {
+          "Content-Type": "application/json",
+          "Authorization": "Bearer " + token_from_storage,
+      },
+    });
+    if(checkResponse.ok) {
+      access_token = token_from_storage;
+      return;
+    }
+  }
+
   var password = prompt("provide the shared secret");
   var form = new FormData();
   form.append("grant_type", "password");
@@ -48,6 +64,8 @@ export async function login() {
   });
   var result = await response.json();
   access_token = result.access_token;
+
+  window.sessionStorage.setItem("access_token", access_token);
 }