From 87f69be5481a8c35c02e13e0df0b9b614b4d093e Mon Sep 17 00:00:00 2001
From: andrei <andrei@duvakin.ru>
Date: Fri, 4 Oct 2024 19:26:11 +0500
Subject: [PATCH] ._.

---
 app/core/usecases/auth_service.py             | 50 +++++++++++++++++++
 .../database/repository/user_repository.py    |  3 ++
 app/infrastructure/fastapi/user_routes.py     | 21 +++++++-
 3 files changed, 72 insertions(+), 2 deletions(-)
 create mode 100644 app/core/usecases/auth_service.py

diff --git a/app/core/usecases/auth_service.py b/app/core/usecases/auth_service.py
new file mode 100644
index 0000000..765376c
--- /dev/null
+++ b/app/core/usecases/auth_service.py
@@ -0,0 +1,50 @@
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+from fastapi import Depends, HTTPException
+from fastapi.security import OAuth2PasswordBearer
+import jwt
+from sqlalchemy.orm import Session
+from dotenv import load_dotenv
+import os
+
+from app.infrastructure.database.dependencies import get_db
+from app.infrastructure.database.repository.user_repository import UsersRepository
+
+load_dotenv()
+
+SECRET_KEY = os.getenv("SECRET_KEY")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.now(timezone.utc) + expires_delta
+    else:
+        expire = datetime.now(timezone.utc) + timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+def verify_token(token: str, db: Session = Depends(get_db)):
+    credentials_exception = HTTPException(
+        status_code=401,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        user_id: str = payload.get("sub")
+        if user_id is None:
+            raise credentials_exception
+
+        user_repo = UsersRepository(db)
+        user = user_repo.get_by_id(
+            int(user_id)
+        )
+        if user is None:
+            raise credentials_exception
+        return user
+    except jwt.PyJWTError:  # Обрабатываем исключения от PyJWT
+        raise credentials_exception
diff --git a/app/infrastructure/database/repository/user_repository.py b/app/infrastructure/database/repository/user_repository.py
index f35c134..72ef013 100644
--- a/app/infrastructure/database/repository/user_repository.py
+++ b/app/infrastructure/database/repository/user_repository.py
@@ -12,6 +12,9 @@ class UsersRepository:
     def get_by_id(self, user_id: int):
         return self.db.query(User).filter(User.id == user_id).first()
 
+    def get_by_login(self, user_login: str):
+        return self.db.query(User).filter(User.login == user_login).first()
+
     def create(self, user: User):
         self.db.add(user)
         self.db.commit()
diff --git a/app/infrastructure/fastapi/user_routes.py b/app/infrastructure/fastapi/user_routes.py
index ca42ece..20f4b05 100644
--- a/app/infrastructure/fastapi/user_routes.py
+++ b/app/infrastructure/fastapi/user_routes.py
@@ -1,11 +1,15 @@
 from typing import List
 
-from fastapi import APIRouter, HTTPException, Depends
+from fastapi import APIRouter, Depends
+from fastapi import HTTPException
+from fastapi.security import OAuth2PasswordRequestForm
 from sqlalchemy.orm import Session
 
-from app.infrastructure.database.dependencies import get_db
 from app.core.entities.user import UserEntity
+from app.core.usecases.auth_service import create_access_token
 from app.core.usecases.user_service import UsersService
+from app.infrastructure.database.dependencies import get_db
+from app.infrastructure.database.repository.user_repository import UsersRepository
 
 router = APIRouter()
 
@@ -47,3 +51,16 @@ def delete_user(user_id: int, db: Session = Depends(get_db)):
     if not success:
         raise HTTPException(status_code=404, detail="User not found")
     return success
+
+
+@router.post("/token")
+def login(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
+    user_repo = UsersRepository(db)
+    user = user_repo.get_by_login(
+        form_data.username
+    )
+
+    if not user or user.password != form_data.password:
+        raise HTTPException(status_code=400, detail="Incorrect username or password")
+    access_token = create_access_token(data={"sub": user.id})
+    return {"access_token": access_token, "token_type": "bearer"}