Added login route and token signing

middleware/requireBody.js

@@ -0,0 +1,13 @@
+const ErrorResponse = require('../utils/ErrorResponse');
+
+const requireBody = (keys) => (req, res, next) => {
+  const missing = keys.filter((key) => !Object.keys(req.body).includes(key));
+
+  if (missing.length) {
+    return next(new ErrorResponse(`'${missing[0]}' is required`, 400));
+  }
+
+  next();
+};
+
+module.exports = requireBody;