Fix crash when modifying an unknown user

Signed-off-by: Matheus Horstmann <mch15@inf.ufpr.br>
Signed-off-by: Miroslav Bajtoš <mbajtoss@gmail.com>

common/models/user.js

@@ -1358,7 +1358,14 @@ module.exports = function(User) {
       });
       var emailChanged;
       if (ctx.instance) {
-        emailChanged = ctx.instance.email !== ctx.hookState.originalUserData[0].email;
+        // Check if map does not return an empty array
+        // Fix server crashes when try to PUT a non existent id
+        if (ctx.hookState.originalUserData.length > 0) {
+          emailChanged = ctx.instance.email !== ctx.hookState.originalUserData[0].email;
+        } else {
+          emailChanged = true;
+        }
+
         if (emailChanged && ctx.Model.settings.emailVerificationRequired) {
           ctx.instance.emailVerified = false;
         }

test/user.integration.js

@@ -63,6 +63,39 @@ describe('users - integration', function() {
         });
     });
 
+    it('returns error when replacing user that does not exist', function() {
+      const credentials = {email: 'temp@example.com', password: 'pass'};
+      const User = app.models.User;
+      let user;
+
+      let hookEnabled = true;
+      User.beforeRemote('replaceOrCreate', (ctx, unused, next) => {
+        // don't affect subsequent tests!
+        if (!hookEnabled) return;
+        hookEnabled = false;
+
+        // Delete the user *AFTER* the PUT request was authorized
+        // but *BEFORE* replaceOrCreate is invoked
+        User.deleteById(user.id, next);
+      });
+
+      return User.create(credentials)
+        .then(u => {
+          user = u;
+          return User.login(credentials);
+        })
+        .then(token => {
+          return this.put('/api/users')
+            .set('Authorization', token.id)
+            .send({
+              id: user.id,
+              email: 'x@x.com',
+              password: 'x',
+            })
+            .expect(404);
+        });
+    });
+
     it('should create post for a given user', function(done) {
       var url = '/api/users/' + userId + '/posts?access_token=' + accessToken;
       this.post(url)