added a lot of auth code

models/user_model.py

@@ -102,6 +102,20 @@ class User(UserMixin, db.Model):
         """
         return re.sub('[^a-zA-Z0-9_.]', '', nickname)
 
+    @classmethod
+    def authenticate(cls, **kwargs):
+        email = kwargs.get('email')
+        password = kwargs.get('password')
+
+        if not email or not password:
+            return None
+
+        user = cls.query.filter_by(email=email).first()
+        if not user or not user.verify_password(password):
+            return None
+
+        return user
+
     @property
     def is_authenticated(self):
         """