Feature(routing): add current-challenge redirect logic

server/boot/challenge.js

@@ -4,8 +4,10 @@ import debug from 'debug';
 import accepts from 'accepts';
 
 import { ifNoUserSend } from '../utils/middleware';
+import { cachedMap } from '../utils/map';
+import createNameIdMap from '../../common/utils/create-name-id-map';
 
-const log = debug('fcc:challenges');
+const log = debug('fcc:boot:challenges');
 
 function buildUserUpdate(
   user,
@@ -58,11 +60,14 @@ function buildUserUpdate(
   return { alreadyCompleted, updateData };
 }
 
-module.exports = function(app) {
-  const router = app.loopback.Router();
+export default function(app) {
   const send200toNonUser = ifNoUserSend(true);
+  const api = app.loopback.Router();
+  const router = app.loopback.Router();
+  const Block = app.models.Block;
+  const map$ = cachedMap(Block);
 
-  router.post(
+  api.post(
     '/modern-challenge-completed',
     send200toNonUser,
     modernChallengeCompleted
@@ -70,13 +75,13 @@ module.exports = function(app) {
 
   // deprecate endpoint
   // remove once new endpoint is live
-  router.post(
+  api.post(
     '/completed-challenge',
     send200toNonUser,
     completedChallenge
   );
 
-  router.post(
+  api.post(
     '/challenge-completed',
     send200toNonUser,
     completedChallenge
@@ -84,19 +89,25 @@ module.exports = function(app) {
 
   // deprecate endpoint
   // remove once new endpoint is live
-  router.post(
+  api.post(
     '/completed-zipline-or-basejump',
     send200toNonUser,
     projectCompleted
   );
 
-  router.post(
+  api.post(
     '/project-completed',
     send200toNonUser,
     projectCompleted
   );
 
-  app.use(router);
+  router.get(
+    '/challenges/current-challenge',
+    redirectToCurrentChallenge
+  );
+
+  app.use(api);
+  app.use('/:lang', router);
 
   function modernChallengeCompleted(req, res, next) {
     const type = accepts(req).type('html', 'json', 'text');
@@ -255,4 +266,53 @@ module.exports = function(app) {
       })
       .subscribe(() => {}, next);
   }
-};
+
+  function redirectToCurrentChallenge(req, res, next) {
+    const { user } = req;
+    return map$
+      .map(({ entities, result }) => ({
+        result,
+        entities: createNameIdMap(entities)
+      }))
+      .map(({
+        result,
+        entities: {
+          challenge: challengeMap,
+          block: blockMap,
+          superBlock: superBlockMap,
+          challengeIdToName
+        }
+      }) => {
+        let finalChallenge;
+        const dashedName = challengeIdToName[user && user.currentChallengeId];
+        finalChallenge = challengeMap[dashedName];
+        if (
+          !challengeMap ||
+          !blockMap ||
+          !superBlockMap ||
+          !result ||
+          !result.length
+        ) {
+          throw new Error(
+            'entities not found, db may not be properly seeded. Crashing hard'
+          );
+        }
+        // redirect to first challenge
+        if (!finalChallenge) {
+          finalChallenge = challengeMap[
+            block[
+              superBlockMap[
+                result[0]
+              ].blocks[0]
+            ].challenges[0]
+          ];
+        }
+        const { block, dashedName: finalDashedName } = finalChallenge || {};
+        return `/challenges/${block}/${finalDashedName}`;
+      })
+      .subscribe(
+        redirect => res.redirect(redirect || '/map'),
+        next
+      );
+  }
+}