prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Log in user after registration
  ## Current Behavior
  
  User needs to log in after first registration.
  
  ## Expected Behavior
  
  User should be logged into MedTagger right after filling registration form.
  
  ## Steps to Reproduce the Problem
  
    1. Register new user.
    2. You will be redirected to the login page.
    3. Type your login once again...
  
  
  </issue>
  <code>
  [start of backend/medtagger/api/auth/business.py]
  1 """Module responsible for business logic in all Auth endpoint."""
  2 from medtagger.api import InvalidArgumentsException
  3 from medtagger.api.security import hash_password, verify_user_password, generate_auth_token
  4 from medtagger.database.models import User
  5 from medtagger.repositories import roles as RolesRepository, users as UsersRepository
  6 
  7 
  8 def create_user(email: str, password: str, first_name: str, last_name: str) -> int:
  9     """Create user with the given user information. Password is being hashed.
  10 
  11     :param email: user email in string format
  12     :param password: user password in string format
  13     :param first_name: user first name in string format
  14     :param last_name: user last name in string format
  15 
  16     :return: id of the new user
  17     """
  18     user = UsersRepository.get_user_by_email(email)
  19     if user:
  20         raise InvalidArgumentsException('User with this email already exists')
  21     password_hash = hash_password(password)
  22     new_user = User(email, password_hash, first_name, last_name)
  23     role = RolesRepository.get_role_with_name('volunteer')
  24     if not role:
  25         raise InvalidArgumentsException('Role does not exist.')
  26     new_user.roles.append(role)
  27     return UsersRepository.add_new_user(new_user)
  28 
  29 
  30 def sign_in_user(email: str, password: str) -> str:
  31     """Sign in user using given username and password.
  32 
  33     :param email: user email in string format
  34     :param password: user password in string format
  35 
  36     :return: authentication token
  37     """
  38     user = UsersRepository.get_user_by_email(email)
  39     if not user:
  40         raise InvalidArgumentsException('User does not exist.')
  41     if not verify_user_password(user, password):
  42         raise InvalidArgumentsException('Password does not match.')
  43     return generate_auth_token(user)
  44
  [end of backend/medtagger/api/auth/business.py]
  [start of backend/medtagger/api/auth/service.py]
  1 """Module responsible for definition of Auth service."""
  2 from typing import Any
  3 
  4 from flask import request
  5 from flask_restplus import Resource
  6 
  7 from medtagger.api import api
  8 from medtagger.api.auth.business import create_user, sign_in_user
  9 from medtagger.api.auth import serializers
  10 
  11 auth_ns = api.namespace('auth', 'Auth methods')
  12 
  13 
  14 @auth_ns.route('/register')
  15 class Register(Resource):
  16     """Register user endpoint."""
  17 
  18     @staticmethod
  19     @api.expect(serializers.new_user)
  20     @api.doc(responses={201: 'User created', 400: 'Invalid arguments'})
  21     def post() -> Any:
  22         """Register the user."""
  23         user = request.json
  24         user_id = create_user(user['email'], user['password'], user['firstName'], user['lastName'])
  25         return {'id': user_id}, 201
  26 
  27 
  28 @auth_ns.route('/sign-in')
  29 class SignIn(Resource):
  30     """Sign in endpoint."""
  31 
  32     @staticmethod
  33     @api.expect(serializers.sign_in)
  34     @api.doc(responses={200: 'Signed in', 400: 'User does not exist or wrong password was provided'})
  35     def post() -> Any:
  36         """Sign in the user."""
  37         sign_in = request.json
  38         token = sign_in_user(sign_in['email'], sign_in['password'])
  39         return {"token": token}, 200
  40
  [end of backend/medtagger/api/auth/service.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/backend/medtagger/api/auth/business.py b/backend/medtagger/api/auth/business.py
  --- a/backend/medtagger/api/auth/business.py
  +++ b/backend/medtagger/api/auth/business.py
  @@ -1,11 +1,12 @@
   """Module responsible for business logic in all Auth endpoint."""
  +from typing import Tuple
   from medtagger.api import InvalidArgumentsException
   from medtagger.api.security import hash_password, verify_user_password, generate_auth_token
   from medtagger.database.models import User
   from medtagger.repositories import roles as RolesRepository, users as UsersRepository
   
   
  -def create_user(email: str, password: str, first_name: str, last_name: str) -> int:
  +def create_user(email: str, password: str, first_name: str, last_name: str) -> Tuple[int, str]:
       """Create user with the given user information. Password is being hashed.
   
       :param email: user email in string format
  @@ -13,7 +14,7 @@
       :param first_name: user first name in string format
       :param last_name: user last name in string format
   
  -    :return: id of the new user
  +    :return: tuple with user id and authentication token
       """
       user = UsersRepository.get_user_by_email(email)
       if user:
  @@ -24,7 +25,9 @@
       if not role:
           raise InvalidArgumentsException('Role does not exist.')
       new_user.roles.append(role)
  -    return UsersRepository.add_new_user(new_user)
  +    user_id = UsersRepository.add_new_user(new_user)
  +    user_token = generate_auth_token(new_user)
  +    return user_id, user_token
   
   
   def sign_in_user(email: str, password: str) -> str:
  diff --git a/backend/medtagger/api/auth/service.py b/backend/medtagger/api/auth/service.py
  --- a/backend/medtagger/api/auth/service.py
  +++ b/backend/medtagger/api/auth/service.py
  @@ -21,8 +21,8 @@
       def post() -> Any:
           """Register the user."""
           user = request.json
  -        user_id = create_user(user['email'], user['password'], user['firstName'], user['lastName'])
  -        return {'id': user_id}, 201
  +        user_id, user_token = create_user(user['email'], user['password'], user['firstName'], user['lastName'])
  +        return {'id': user_id, 'token': user_token}, 201
   
   
   @auth_ns.route('/sign-in')
  
verification_info: {"golden_diff": "diff --git a/backend/medtagger/api/auth/business.py b/backend/medtagger/api/auth/business.py\n--- a/backend/medtagger/api/auth/business.py\n+++ b/backend/medtagger/api/auth/business.py\n@@ -1,11 +1,12 @@\n \"\"\"Module responsible for business logic in all Auth endpoint.\"\"\"\n+from typing import Tuple\n from medtagger.api import InvalidArgumentsException\n from medtagger.api.security import hash_password, verify_user_password, generate_auth_token\n from medtagger.database.models import User\n from medtagger.repositories import roles as RolesRepository, users as UsersRepository\n \n \n-def create_user(email: str, password: str, first_name: str, last_name: str) -> int:\n+def create_user(email: str, password: str, first_name: str, last_name: str) -> Tuple[int, str]:\n     \"\"\"Create user with the given user information. Password is being hashed.\n \n     :param email: user email in string format\n@@ -13,7 +14,7 @@\n     :param first_name: user first name in string format\n     :param last_name: user last name in string format\n \n-    :return: id of the new user\n+    :return: tuple with user id and authentication token\n     \"\"\"\n     user = UsersRepository.get_user_by_email(email)\n     if user:\n@@ -24,7 +25,9 @@\n     if not role:\n         raise InvalidArgumentsException('Role does not exist.')\n     new_user.roles.append(role)\n-    return UsersRepository.add_new_user(new_user)\n+    user_id = UsersRepository.add_new_user(new_user)\n+    user_token = generate_auth_token(new_user)\n+    return user_id, user_token\n \n \n def sign_in_user(email: str, password: str) -> str:\ndiff --git a/backend/medtagger/api/auth/service.py b/backend/medtagger/api/auth/service.py\n--- a/backend/medtagger/api/auth/service.py\n+++ b/backend/medtagger/api/auth/service.py\n@@ -21,8 +21,8 @@\n     def post() -> Any:\n         \"\"\"Register the user.\"\"\"\n         user = request.json\n-        user_id = create_user(user['email'], user['password'], user['firstName'], user['lastName'])\n-        return {'id': user_id}, 201\n+        user_id, user_token = create_user(user['email'], user['password'], user['firstName'], user['lastName'])\n+        return {'id': user_id, 'token': user_token}, 201\n \n \n @auth_ns.route('/sign-in')\n", "issue": "Log in user after registration\n## Current Behavior\r\n\r\nUser needs to log in after first registration.\r\n\r\n## Expected Behavior\r\n\r\nUser should be logged into MedTagger right after filling registration form.\r\n\r\n## Steps to Reproduce the Problem\r\n\r\n  1. Register new user.\r\n  2. You will be redirected to the login page.\r\n  3. Type your login once again...\r\n\n", "before_files": [{"content": "\"\"\"Module responsible for business logic in all Auth endpoint.\"\"\"\nfrom medtagger.api import InvalidArgumentsException\nfrom medtagger.api.security import hash_password, verify_user_password, generate_auth_token\nfrom medtagger.database.models import User\nfrom medtagger.repositories import roles as RolesRepository, users as UsersRepository\n\n\ndef create_user(email: str, password: str, first_name: str, last_name: str) -> int:\n    \"\"\"Create user with the given user information. Password is being hashed.\n\n    :param email: user email in string format\n    :param password: user password in string format\n    :param first_name: user first name in string format\n    :param last_name: user last name in string format\n\n    :return: id of the new user\n    \"\"\"\n    user = UsersRepository.get_user_by_email(email)\n    if user:\n        raise InvalidArgumentsException('User with this email already exists')\n    password_hash = hash_password(password)\n    new_user = User(email, password_hash, first_name, last_name)\n    role = RolesRepository.get_role_with_name('volunteer')\n    if not role:\n        raise InvalidArgumentsException('Role does not exist.')\n    new_user.roles.append(role)\n    return UsersRepository.add_new_user(new_user)\n\n\ndef sign_in_user(email: str, password: str) -> str:\n    \"\"\"Sign in user using given username and password.\n\n    :param email: user email in string format\n    :param password: user password in string format\n\n    :return: authentication token\n    \"\"\"\n    user = UsersRepository.get_user_by_email(email)\n    if not user:\n        raise InvalidArgumentsException('User does not exist.')\n    if not verify_user_password(user, password):\n        raise InvalidArgumentsException('Password does not match.')\n    return generate_auth_token(user)\n", "path": "backend/medtagger/api/auth/business.py"}, {"content": "\"\"\"Module responsible for definition of Auth service.\"\"\"\nfrom typing import Any\n\nfrom flask import request\nfrom flask_restplus import Resource\n\nfrom medtagger.api import api\nfrom medtagger.api.auth.business import create_user, sign_in_user\nfrom medtagger.api.auth import serializers\n\nauth_ns = api.namespace('auth', 'Auth methods')\n\n\n@auth_ns.route('/register')\nclass Register(Resource):\n    \"\"\"Register user endpoint.\"\"\"\n\n    @staticmethod\n    @api.expect(serializers.new_user)\n    @api.doc(responses={201: 'User created', 400: 'Invalid arguments'})\n    def post() -> Any:\n        \"\"\"Register the user.\"\"\"\n        user = request.json\n        user_id = create_user(user['email'], user['password'], user['firstName'], user['lastName'])\n        return {'id': user_id}, 201\n\n\n@auth_ns.route('/sign-in')\nclass SignIn(Resource):\n    \"\"\"Sign in endpoint.\"\"\"\n\n    @staticmethod\n    @api.expect(serializers.sign_in)\n    @api.doc(responses={200: 'Signed in', 400: 'User does not exist or wrong password was provided'})\n    def post() -> Any:\n        \"\"\"Sign in the user.\"\"\"\n        sign_in = request.json\n        token = sign_in_user(sign_in['email'], sign_in['password'])\n        return {\"token\": token}, 200\n", "path": "backend/medtagger/api/auth/service.py"}]}