feat(api): get challenges directly from /curriculum

api-server/server/utils/get-curriculum.js

@@ -0,0 +1,30 @@
+import { flatten } from 'lodash';
+
+import { getChallengesForLang } from '../../../curriculum/getChallenges';
+
+// TODO: this caching is handy if we want to field requests that need to 'query'
+// the curriculum, but if we force the client to handle
+// redirectToCurrentChallenge and, instead, only report the current challenge
+// id via the user object, then we should *not* store this so it can be garbage
+// collected.
+
+let curriculum;
+export async function getCurriculum() {
+  curriculum = curriculum
+    ? curriculum
+    : getChallengesForLang(process.env.LOCALE);
+  return curriculum;
+}
+
+export async function getChallenges() {
+  return getCurriculum().then(curriculum => {
+    return Object.keys(curriculum)
+      .map(key => curriculum[key].blocks)
+      .reduce((challengeArray, superBlock) => {
+        const challengesForBlock = Object.keys(superBlock).map(
+          key => superBlock[key].challenges
+        );
+        return [...challengeArray, ...flatten(challengesForBlock)];
+      }, []);
+  });
+}