Add Auth Index page (#323)

front/src/pages/auth/Callback.tsx

@@ -0,0 +1,30 @@
+import { useEffect, useState } from 'react';
+import { useNavigate, useSearchParams } from 'react-router-dom';
+
+import { getTokensFromLoginToken } from '@/auth/services/AuthService';
+
+export function Callback() {
+  const [searchParams] = useSearchParams();
+  const [isLoading, setIsLoading] = useState(false);
+
+  const loginToken = searchParams.get('loginToken');
+  const navigate = useNavigate();
+
+  useEffect(() => {
+    async function getTokens() {
+      if (!loginToken) {
+        return;
+      }
+      setIsLoading(true);
+      await getTokensFromLoginToken(loginToken);
+      setIsLoading(false);
+      navigate('/');
+    }
+
+    if (!isLoading) {
+      getTokens();
+    }
+  }, [isLoading, navigate, loginToken]);
+
+  return <></>;
+}