Add auth and blacklist APIs

server/middleware/checkBlacklist.js

@@ -1,15 +1,26 @@
-function checkBlacklist(blacklist) {
-  return function(req, res, next) {
-    // Do not allow packages that have been blacklisted.
-    if (blacklist.includes(req.packageName)) {
-      res
-        .status(403)
-        .type('text')
-        .send(`Package "${req.packageName}" is blacklisted`)
-    } else {
-      next()
+const BlacklistAPI = require('../BlacklistAPI')
+
+function checkBlacklist(req, res, next) {
+  BlacklistAPI.containsPackage(req.packageName).then(
+    blacklisted => {
+      // Disallow packages that have been blacklisted.
+      if (blacklisted) {
+        res
+          .status(403)
+          .type('text')
+          .send(`Package "${req.packageName}" is blacklisted`)
+      } else {
+        next()
+      }
+    },
+    error => {
+      console.error(error)
+
+      res.status(500).send({
+        error: 'Unable to fetch the blacklist'
+      })
     }
-  }
+  )
 }
 
 module.exports = checkBlacklist