improved register endpoint, etc.

backend/models/user_model.py

@@ -5,7 +5,7 @@ Example user model and related models
 import json
 
 import sqlalchemy
-from sqlalchemy.orm import relation
+from sqlalchemy.orm import relation, validates
 from sqlalchemy import MetaData, any_
 
 from backend import db, app, login_manager
@@ -20,6 +20,7 @@ from datetime import datetime, timedelta
 from passlib.hash import sha256_crypt
 from hashlib import md5
 
+
 metadata = MetaData()
 
 followers = db.Table('followers',
@@ -137,6 +138,11 @@ class User(UserMixin, db.Model):
         if external_user is not None:
             self.external_user = external_user
 
+    @validates('email')
+    def validate_address(self, key, email):
+        assert re.match(r"[^@]+@[^@]+\.[^@]+", email), "email is invalid"
+        return email
+
     @staticmethod
     @login_manager.user_loader
     def get_by_identifier(identifier):