fix: add comment to the login code

interface/src/App.tsx

@@ -27,9 +27,11 @@ export default function App() {
   const refresh = useCallback(async () => {
     // Get the session cookie
     const sessionCookie = off.getCookie("session");
+    // If the session cookie is the same as the last seen cookie, return the current login state
     if (sessionCookie === lastSeenCookie.current) {
       return userState.isLoggedIn;
     }
+    // If the session cookie is null, the user is not logged in
     if (!sessionCookie) {
       setUserState({
         userName: "",
@@ -38,10 +40,12 @@ export default function App() {
       lastSeenCookie.current = sessionCookie;
       return false;
     }
+    // If the session cookie is not null, send a request to the server to check if the user is logged in
     const isLoggedIn = axios
       .get("https://world.openfoodfacts.org/cgi/session.pl", {
         withCredentials: true,
       })
+      // If the request is successful, set the user state to logged in
       .then(() => {
         const cookieUserName = off.getUsername();
         setUserState({
@@ -51,6 +55,7 @@ export default function App() {
         lastSeenCookie.current = sessionCookie;
         return true;
       })
+      // If the request is not successful, set the user state to logged out
       .catch(() => {
         setUserState({
           userName: "",

interface/src/off.ts

@@ -1,15 +1,17 @@
 const offService = {
-getCookie(name: any) {
-    const cookies = document.cookie
-        .split(";")
-        .filter((item) => item.trim().startsWith(`${name}=`));
-    if (cookies.length) {
-        const cookie = cookies[0];
-        return cookie.split("=", 2)[1];
-    }
-    return "";
-},
+  // Get cookie by name return empty string if not found
+  getCookie(name: any) {
+      const cookies = document.cookie
+          .split(";")
+          .filter((item) => item.trim().startsWith(`${name}=`));
+      if (cookies.length) {
+          const cookie = cookies[0];
+          return cookie.split("=", 2)[1];
+      }
+      return "";
+  },
 
+  // Get user id from cookie return empty string if not found
   getUsername() {
     const sessionCookie = this.getCookie("session");
 
@@ -31,12 +33,4 @@ getCookie(name: any) {
   },
 };
 
-export default offService;
-
-// Fetching products to annotate:
-
-// https://world.openfoodfacts.org/cgi/search.pl?page=0&page_size=25&json=true&action=process&fields=code,lang,image_ingredients_url,product_name,ingredient,images&tagtype_0=states&tag_contains_0=contains&tag_0=en%3Aingredients-to-be-completed&tagtype_1=states&tag_contains_1=contains&tag_1=en%3Aingredients-photo-selected
-
-// Getting prediction:
-// https://robotoff.openfoodfacts.org/api/v1/predict/ingredient_list?ocr_url=https://images.openfoodfacts.org/images/products/505/382/713/9229/41.json
-// https://images.openfoodfacts.org/images/products/505/382/713/9229/41.json
+export default offService;