🔧 Add working and error to useSavedLogin

code/frontend/src/contexts/ContextLogin.js

@@ -7,6 +7,8 @@ import {createContext} from "react";
  *   - `server`: The base url of the N.E.S.T. backend
  *   - `email`: The email of the account the user is logged in as
  *   - `token`: The bearer token to use in authenticated API requests
+ * - `working`: `true` if the login procedure is running, `false` otherwise
+ * - `error`: `null` if no login error happened, an instance of {@link Error} otherwise.
  * - `login`: an async function which logs in the user if given the following parameters: `server, email, password`
  * - `logout`: a function which logs out the user
  * - `fetch_unauth`: a variant of {@link fetch} which uses `state.server` as the base url, allowing only the API path

code/frontend/src/hooks/useSavedLogin.js

@@ -1,3 +1,4 @@
+import {useState} from "react"
 import useLocalStorageState from "./useLocalStorageState"
 
 
@@ -6,8 +7,12 @@ import useLocalStorageState from "./useLocalStorageState"
  */
 export default function useSavedLogin() {
     const [state, setState] = useLocalStorageState("login", null)
+    const [working, setWorking] = useState(false)
+    const [error, setError] = useState(null)
 
     const login = async (server, email, password) => {
+        setWorking(true)
+        try {
             console.debug("Contacting server to login...")
             const response = await fetch(`${server}/api/login`, {
                 method: "POST",
@@ -26,8 +31,8 @@ export default function useSavedLogin() {
 
             console.debug("Ensuring the request was a success...")
             if(data["result"] !== "success") {
-            console.error(`Login failed: ${data["msg"]}`)
+                // noinspection ExceptionCaughtLocallyJS
-            return
+                throw new Error(data["msg"])
             }
 
             console.debug("Storing login state...")
@@ -38,9 +43,17 @@ export default function useSavedLogin() {
                 username: data["user"]["username"],
                 token: data["access_token"],
             })
-        console.debug("Stored login state!")
+
+            console.debug("Clearing error...")
+            setError(null)
 
             console.info("Login successful!")
+        } catch(e) {
+            console.error(`Caught error while trying to login: ${e}`)
+            setError(e)
+        } finally {
+            setWorking(false)
+        }
     }
 
     const logout = () => {
@@ -65,5 +78,5 @@ export default function useSavedLogin() {
         return await fetch_unauth(path, init)
     }
 
-    return {state, login, logout, fetch_unauth, fetch_auth}
+    return {state, working, error, login, logout, fetch_unauth, fetch_auth}
 }

code/frontend/src/routes/PageLogin.js

@@ -16,7 +16,7 @@ export default function PageLogin({ className, ...props }) {
     const [server, setServer] = useState("http://localhost:5000")
     const [email, setEmail] = useState("admin@admin.com")
     const [password, setPassword] = useState("password")
-    const {login} = useContext(ContextLogin)
+    const {login, working, error} = useContext(ContextLogin)
     const history = useHistory()
 
     return (
@@ -60,7 +60,8 @@ export default function PageLogin({ className, ...props }) {
                             history.push("/dashboard")
                         }}
                         icon={faArrowRight}
-                        color={"Green"}
+                        color={error ? "Green" : "Red"}
+                        disabled={working}
                     >
                         Login
                     </Button>