Merge pull request 'login' (#1) from login into master

Reviewed-on: #1

.gitignore

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+__pycache__

app/dependencies/permissions_checker.py

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+from ..dependencies import users_active
+from fastapi import  Depends, HTTPException, status
+from ..models import users
+
+
+class PermissionChecker:
+
+    def __init__(self, roles: list[str]) -> None:
+        self.roles = roles
+
+    def __call__(self, user: users.User = Depends(users_active.get_current_active_user)) -> bool:
+        for role in self.roles:
+            if role == user.roles:
+                return True
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail='Roles unauthorized'
+        )

app/dependencies/users_active.py

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+from datetime import datetime, timedelta
+from typing import Annotated
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+
+from ..models import users, token
+
+
+fake_users = [
+    # password foo
+    {'id': 1, 'username': 'admin', 'password': '$2b$12$N.i74Kle18n5Toxhas.rVOjZreVC2WM34fCidNDyhSNgxVlbKwX7i',
+     'roles': 'Admin', 'disabled': False
+    },
+    # password bar
+    {'id': 2, 'username': 'client', 'password': '$2b$12$KUgpw1m0LF/s9NS1ZB5rRO2cA5D13MqRm56ab7ik2ixftXW/aqEyq',
+     'roles':'User', 'disabled':False}
+]
+
+SECRET_KEY = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
+
+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):
+    for user in db:
+        if username == user['username']:
+            return users.UserInDB(**user)
+
+def authenticate_user(fake_db, username: str, password: str):
+    user = get_user(fake_db, username)
+    if not user:
+        return False
+    if not verify_password(password, user.password):
+        return False
+    return user
+
+def create_access_token(data: dict, expires_delta: 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: Annotated[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_str, SECRET_KEY, algorithms=[ALGORITHM])
+        username: str = payload.get("sub")
+        if username is None:
+            raise credentials_exception
+        token_data = token.TokenData(username=username)
+    except JWTError:
+        raise credentials_exception
+    user = get_user(fake_users, username=token_data.username)
+    if user is None:
+        raise credentials_exception
+    return user
+
+async def get_current_active_user(
+    current_user: Annotated[users.User, Depends(get_current_user)]
+):
+    if current_user.disabled:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user

app/main.py

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+from fastapi import FastAPI
+
+from .routers import users, token
+
+
+app = FastAPI()
+
+app.include_router(users.router)
+app.include_router(token.router)
+
+@app.get("/")
+async def root():
+    return {"message": "Hello World !"}

app/models/token.py

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+from pydantic import BaseModel
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenData(BaseModel):
+    username: str | None = None

app/models/users.py

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+from pydantic import BaseModel
+
+
+class User(BaseModel):
+    id: int
+    username: str
+    password: str
+    roles: str
+    disabled: bool
+
+class UserInDB(User):
+    password: str

app/routers/token.py

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+from datetime import datetime, timedelta
+
+from typing import Annotated
+from fastapi import Depends, FastAPI, HTTPException, status, APIRouter
+from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
+from ..dependencies import users_active
+from ..models import token
+
+router = APIRouter()
+
+
+@router.post("/token", response_model=token.Token, tags=["token"])
+async def login_for_access_token(
+    form_data: Annotated[OAuth2PasswordRequestForm, Depends()]
+):
+    user = users_active.authenticate_user(users_active.fake_users, 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=users_active.ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = users_active.create_access_token(
+        data={"sub": user.username}, expires_delta=access_token_expires
+    )
+    return {"access_token": access_token, "token_type": "bearer"}

app/routers/users.py

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+from fastapi import APIRouter, Depends
+from ..dependencies import users_active, permissions_checker
+from ..models import users
+from typing import Annotated
+
+
+router = APIRouter()
+
+@router.get("/users/", tags=["users"], response_model=list[users.User])
+async def read_users(current_user: Annotated[users.User, Depends(users_active.get_current_active_user)], authorize: Annotated[bool, Depends(permissions_checker.PermissionChecker(roles=["Admin"]))]):
+    return users_active.fake_users
+
+@router.get("/users/me",tags=["users"], response_model=users.User)
+async def read_users_me(current_user: Annotated[users.User, Depends(users_active.get_current_active_user)], authorize: Annotated[bool, Depends(permissions_checker.PermissionChecker(roles=["Admin", "User"]))]):
+        return current_user

requierements.txt

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+fastapi
+uvicorn[standard]
+pydantic-mongo
+python-jose[cryptography]
+passlib[bcrypt]
+python-multipart