feat(challenge): Initial build of the challenge service

server/services/challenge.js

@@ -0,0 +1,53 @@
+import debug from 'debug';
+import { pickBy } from 'lodash';
+import { Observable } from 'rx';
+
+import { cachedMap, getMapForLang } from '../utils/map';
+import { shapeChallenges } from '../../common/app/redux/utils';
+
+const log = debug('fcc:services:challenge');
+const isDev = debug.enabled('fcc:*');
+
+export default function getChallengesForBlock(app) {
+  const challengeMap = cachedMap(app.models);
+  return {
+    name: 'challenges-for-block',
+    read: function readChallengesForBlock(
+      req,
+      resource,
+      { blockName, lang = 'en' } = {},
+      config,
+      cb
+    ) {
+      log(`sourcing challenges for the ${blockName} block`);
+      return challengeMap.map(getMapForLang(lang))
+        .flatMap(({
+          result: { superBlocks },
+          entities: {
+            block: fullBlockMap,
+            challenge: challengeMap
+          }
+        }) => {
+          const requestedChallenges = pickBy(
+            challengeMap,
+            ch => ch.block === blockName
+          );
+          const entities = {
+            block: {
+              [blockName]: fullBlockMap[blockName]
+            },
+            challenge: requestedChallenges
+          };
+          const { challenge, block } = shapeChallenges(entities, isDev);
+          return Observable.of({
+            result: { superBlocks },
+            entities: { challenge, block }
+          });
+        })
+        .subscribe(
+          result => cb(null, result),
+          cb
+        );
+    }
+  };
+}