fix: return empty array

app.js

@@ -23,6 +23,7 @@ const debug = Debug('app')
 
 let { privateKey, certDer, thumbprint, exponent, modulus } = cert(jwksOrigin)
 
+const users = {}
 const sessions = {}
 const challenges = {}
 
@@ -354,11 +355,26 @@ app.post('/issuer', (req, res) => {
 })
 
 app.get('/api/v2/users-by-email', (req, res) => {
-  res.json([])
+  const email = req.query.email
+
+  const user = users[email]
+  if (user === undefined) {
+    res.json([])
+  } else {
+    res.json([
+      user
+    ])
+  }
 })
 
 app.post('/api/v2/users', (req, res) => {
   const email = req.body.email
+  users[email] = {
+    "email": email,
+    "given_name": "Given",
+    "family_name": "Last",
+    "user_id": email,
+  }
   res.json({
     user_id: `auth0|${email}`
   })