Add basic API functions and working account.auth method

api/models.py

@@ -1,3 +1,54 @@
-from django.db import models
+from datetime import datetime
 
-# Create your models here.
+from django.db import models
+from account.models import SiteUser
+
+from hashlib import sha512
+from django.contrib.auth.hashers import check_password
+
+from .api_errors import *
+
+
+class UserToken(models.Model):
+    user = models.ForeignKey(SiteUser, on_delete=models.CASCADE)
+    access_token = models.CharField(max_length=128, editable=False, unique=True)
+    creation_time = models.DateTimeField(default=datetime.now)
+
+    @staticmethod
+    def create_token(user: SiteUser):
+        source = bytearray(user.email + user.password + str(datetime.now()), 'utf-8')
+        h = sha512(source).hexdigest()
+
+        # чекаем токен в базе
+        if UserToken.objects.filter(access_token=h).count() != 0:
+            # по какой-то причине есть, выкидываем исключение
+            raise Exception(API_ERROR_TOKEN_CREATION)
+
+        token = UserToken(access_token=h, user=user)
+        token.save()
+
+        print(f"created token {token.access_token[:16]}...")
+
+        return token
+
+    @staticmethod
+    def auth(login: str, password: str):
+        user = SiteUser.objects.filter(email=login)
+
+        if len(user) == 0:
+            raise Exception(API_ERROR_INVALID_LOGIN)
+
+        if not check_password(password, user[0].password):
+            raise Exception(API_ERROR_INVALID_PASSWORD)
+
+        return user[0]
+
+    @staticmethod
+    def get_user_by_token(token: str):
+        t = UserToken.objects.get(access_token=token)
+        if t is None:
+            raise Exception(API_ERROR_INVALID_TOKEN)
+        return t.user
+
+    def __str__(self):
+        return self.user.email + ": " + self.access_token[:10] + "..."