Distribute and handle challenge.json

frontend/ui/src/stores/challengeinfo.js

@@ -0,0 +1,22 @@
+import { readable, writable } from 'svelte/store';
+
+function createChallengeStore() {
+  const { subscribe, set, update } = writable({});
+
+  return {
+    subscribe,
+    update: (res_challenge, cb) => {
+      if (res_challenge.status === 200) {
+        res_challenge.json().then((challenge) => {
+          update((s) => (Object.assign({}, challenge)));
+
+          if (cb) {
+            cb(challenge);
+          }
+        });
+      }
+    },
+  }
+}
+
+export const challengeInfo = createChallengeStore();