add: login backend

backend/src/main.py

@@ -1,14 +1,39 @@
-from datetime import datetime
+from base64 import b64decode
+from datetime import datetime, timedelta
 from re import IGNORECASE, sub as substitute
-from typing import List, Optional
+from typing import List, Optional, Union
 from urllib.parse import unquote_plus
 
 from fastapi import Depends, FastAPI, File, HTTPException, UploadFile, status
+from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
+from jose import JWTError, jwt
+from passlib.context import CryptContext
 from sqlalchemy.orm import Session
 
 from . import crud, models, schemas, spreadsheet
 from .database import SessionLocal, engine
 
+# Security
+
+# take it from env
+SECRET_KEY = b64decode("iYg7wB+sPihtjz50iJTsD0XmOeUwKy2TJtfNLcqFRM8=").hex()
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 3600
+
+# End Security
+
+demo_users_db = {
+    "demo": {
+        "username": "demo",
+        "role": "admin",
+        "hashed_password": "$2b$12$zOlQeINlYu0SxTkV2Zi7b.dFGM9ljxZX8N7Wqb.4ocGlyO51ghpra",  # "demo"
+        "disabled": False,
+    }
+}
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
 
 app = FastAPI()
 
@@ -21,6 +46,101 @@ def get_db():
         db.close()
 
 
+def verify_password(plain_password, hashed_password):
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password):
+    return pwd_context.hash(password)
+
+
+def get_user(db, username: str):
+    if username in db:
+        user_dict = db[username]
+        return schemas.UserInDB(**user_dict)
+
+
+def authenticate_user(demo_db, username: str, password: str):
+    user = get_user(demo_db, username)
+    if not user:
+        return False
+    if not verify_password(password, user.hashed_password):
+        return False
+    return user
+
+
+def create_access_token(data: dict, expires_delta: Union[timedelta, None] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+async def get_current_user(token: str = Depends(oauth2_scheme)):
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        username: str = payload.get("sub")
+        if username is None:
+            raise credentials_exception
+        token_data = schemas.TokenData(username=username)
+    except JWTError:
+        raise credentials_exception
+    user = get_user(demo_users_db, username=token_data.username)
+    if user is None:
+        raise credentials_exception
+    return user
+
+
+async def get_current_active_user(
+    current_user: schemas.User = Depends(get_current_user),
+):
+    if current_user.disabled:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST, detail="Inactive user"
+        )
+    return current_user
+
+
+async def get_current_active_admin(
+    current_user: schemas.User = Depends(get_current_active_user),
+):
+    if current_user.role != "admin":
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST, detail="Insufficient permissions"
+        )
+    return current_user
+
+
+@app.post("/token/", response_model=schemas.Token)
+async def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends()):
+    user = authenticate_user(demo_users_db, form_data.username, form_data.password)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = create_access_token(
+        data={"sub": user.username}, expires_delta=access_token_expires
+    )
+    return {"access_token": access_token, "token_type": "bearer"}
+
+
+@app.get("/users/me/", response_model=schemas.User)
+async def read_users_me(current_user: schemas.User = Depends(get_current_active_admin)):
+    return current_user
+
+
 @app.post(
     "/items/",
     responses={
@@ -32,7 +152,11 @@ def get_db():
     },
     response_model=schemas.InsertStatus,
 )
-def create_items(file: UploadFile = File(...), db: Session = Depends(get_db)):
+def create_items(
+    file: UploadFile = File(...),
+    db: Session = Depends(get_db),
+    current_user: schemas.User = Depends(get_current_active_admin),
+):
     """импорт в базу данных Описаний наборов данных из Excel файлов"""
     try:
         start = datetime.now()

backend/src/schemas.py

@@ -4,6 +4,31 @@ from typing import Optional, Union
 from pydantic import BaseModel
 
 
+# Security
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenData(BaseModel):
+    username: Union[str, None] = None
+
+
+class User(BaseModel):
+    username: str
+    role: Union[str, None] = None
+    disabled: Union[bool, None] = None
+
+
+class UserInDB(User):
+    hashed_password: str
+
+
+# End Security
+
+
 class HeaderBase(BaseModel):
     database: str
     spreadsheet: str