Started creating auth system

extensions/security.py

@@ -0,0 +1,56 @@
+from datetime import timedelta
+from modules.database import col_users
+from modules.app import app
+
+from fastapi import Depends, HTTPException, Security, Response
+from starlette.status import HTTP_204_NO_CONTENT
+from fastapi.security import (
+    OAuth2PasswordRequestForm,
+)
+
+from modules.security import (
+    ACCESS_TOKEN_EXPIRE_DAYS,
+    Token,
+    User,
+    authenticate_user,
+    create_access_token,
+    get_current_active_user,
+    get_current_user,
+    get_password_hash
+)
+
+
+@app.post("/token", response_model=Token)
+async def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends()):
+    user = authenticate_user(form_data.username, form_data.password)
+    if not user:
+        raise HTTPException(status_code=400, detail="Incorrect user or password")
+    access_token_expires = timedelta(days=ACCESS_TOKEN_EXPIRE_DAYS)
+    access_token = create_access_token(
+        data={"sub": user.user, "scopes": form_data.scopes},
+        expires_delta=access_token_expires,
+    )
+    return {"access_token": access_token, "token_type": "bearer"}
+
+
+@app.get("/users/me/", response_model=User)
+async def read_users_me(current_user: User = Depends(get_current_active_user)):
+    return current_user
+
+
+@app.post("/users", response_class=Response)
+async def create_users(user: str, email: str, password: str):
+    col_users.insert_one( {"user": user, "email": email, "hash": get_password_hash(password), "disabled": True} )
+    return Response(status_code=HTTP_204_NO_CONTENT)
+
+
+@app.get("/users/me/items/")
+async def read_own_items(
+    current_user: User = Security(get_current_active_user, scopes=["items"])
+):
+    return [{"item_id": "Foo", "owner": current_user.user}]
+
+
+@app.get("/status/")
+async def read_system_status(current_user: User = Depends(get_current_user)):
+    return {"status": "ok"}

modules/security.py

@@ -0,0 +1,143 @@
+from datetime import datetime, timedelta
+from typing import List, Union
+from modules.database import col_users
+from modules.app import app
+
+from fastapi import Depends, HTTPException, Security, status
+from starlette.status import HTTP_204_NO_CONTENT
+from fastapi.security import (
+    OAuth2PasswordBearer,
+    SecurityScopes,
+)
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from pydantic import BaseModel, ValidationError
+
+
+with open("secret_key", "r", encoding="utf-8") as f:
+    SECRET_KEY = f.read()
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_DAYS = 180
+
+
+fake_users_db = {
+    "johndoe": {
+        "user": "johndoe",
+        "email": "johndoe@example.com",
+        "hash": "$2b$12$EixZaYVK1fsbw1ZfbX3OXePaWxn96p36WQoeG6Lruj3vjPGga31lW",
+        "disabled": False,
+    },
+    "alice": {
+        "user": "alice",
+        "email": "alicechains@example.com",
+        "hash": "$2b$12$gSvqqUPvlXP2tfVFaWK1Be7DlH.PKZbv5H8KnzzVgXXbVxpva.pFm",
+        "disabled": True,
+    },
+}
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenData(BaseModel):
+    user: Union[str, None] = None
+    scopes: List[str] = []
+
+
+class User(BaseModel):
+    user: str
+    email: Union[str, None] = None
+    disabled: Union[bool, None] = None
+
+
+class UserInDB(User):
+    hash: str
+
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+oauth2_scheme = OAuth2PasswordBearer(
+    tokenUrl="token",
+    scopes={
+        "me": "Get current user's data.",
+        "list": "List albums and images.",
+        "read": "View albums and images.",
+        "write": "Manage albums and images."},
+)
+
+
+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(user: str):
+    found_user = col_users.find_one( {"user": user} )
+    return UserInDB(user=found_user["user"], email=found_user["email"], disabled=found_user["disabled"], hash=found_user["hash"])
+
+
+def authenticate_user(user_name: str, password: str):
+    user = get_user(user_name)
+    if not user:
+        return False
+    if not verify_password(password, user.hash):
+        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(days=ACCESS_TOKEN_EXPIRE_DAYS)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+async def get_current_user(
+    security_scopes: SecurityScopes, token: str = Depends(oauth2_scheme)
+):
+    if security_scopes.scopes:
+        authenticate_value = f'Bearer scope="{security_scopes.scope_str}"'
+    else:
+        authenticate_value = "Bearer"
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": authenticate_value},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        user: str = payload.get("sub")
+        if user is None:
+            raise credentials_exception
+        token_scopes = payload.get("scopes", [])
+        token_data = TokenData(scopes=token_scopes, user=user)
+    except (JWTError, ValidationError):
+        raise credentials_exception
+    user = get_user(user=token_data.user)
+    if user is None:
+        raise credentials_exception
+    for scope in security_scopes.scopes:
+        if scope not in token_data.scopes:
+            raise HTTPException(
+                status_code=status.HTTP_401_UNAUTHORIZED,
+                detail="Not enough permissions",
+                headers={"WWW-Authenticate": authenticate_value},
+            )
+    return user
+
+
+async def get_current_active_user(
+    current_user: User = Security(get_current_user, scopes=["me"])
+):
+    if current_user.disabled:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user