WIP: Login auth and JWT encode/decode
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gustavoschaedler
parent
98f3c708e4
commit
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4 changed files with 350 additions and 254 deletions
316
poetry.lock
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316
poetry.lock
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@ -64,6 +64,9 @@ orjson = "^3.9.1"
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multiprocess = "^0.70.14"
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cachetools = "^5.3.1"
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types-cachetools = "^5.3.0.5"
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python-jose = "^3.3.0"
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passlib = "^1.7.4"
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bcrypt = "^4.0.1"
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[tool.poetry.group.dev.dependencies]
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143
src/backend/langflow/login.py
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143
src/backend/langflow/login.py
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@ -0,0 +1,143 @@
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from datetime import datetime, timedelta
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from typing import Annotated
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from fastapi import Depends, FastAPI, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from pydantic import BaseModel
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# to get a string like this run:
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# openssl rand -hex 32
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SECRET_KEY = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 30
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fake_users_db = {
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"johndoe": {
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"username": "johndoe",
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"full_name": "John Doe",
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"email": "johndoe@example.com",
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"hashed_password": "$2b$12$EixZaYVK1fsbw1ZfbX3OXePaWxn96p36WQoeG6Lruj3vjPGga31lW",
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"disabled": False,
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}
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}
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class Token(BaseModel):
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access_token: str
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token_type: str
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class TokenData(BaseModel):
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username: str | None = None
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class User(BaseModel):
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username: str
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email: str | None = None
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full_name: str | None = None
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disabled: bool | None = None
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class UserInDB(User):
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hashed_password: str
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
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def verify_password(plain_password, hashed_password):
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password):
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return pwd_context.hash(password)
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def get_user(db, username: str):
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if username in db:
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user_dict = db[username]
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return UserInDB(**user_dict)
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def authenticate_user(fake_db, username: str, password: str):
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user = get_user(fake_db, username)
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if not user:
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return False
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if not verify_password(password, user.hashed_password):
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return False
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return user
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def create_access_token(data: dict, expires_delta: timedelta | None = None):
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to_encode = data.copy()
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if expires_delta:
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expire = datetime.utcnow() + expires_delta
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else:
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expire = datetime.utcnow() + timedelta(minutes=15)
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to_encode.update({"exp": expire})
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encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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return encoded_jwt
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async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]):
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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username: str = payload.get("sub")
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if username is None:
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raise credentials_exception
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token_data = TokenData(username=username)
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except JWTError:
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raise credentials_exception
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user = get_user(fake_users_db, username=token_data.username)
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if user is None:
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raise credentials_exception
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return user
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async def get_current_active_user(
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current_user: Annotated[User, Depends(get_current_user)]
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):
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if current_user.disabled:
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raise HTTPException(status_code=400, detail="Inactive user")
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return current_user
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@app.post("/token", response_model=Token)
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async def login_for_access_token(
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form_data: Annotated[OAuth2PasswordRequestForm, Depends()]
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):
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user = authenticate_user(fake_users_db, form_data.username, form_data.password)
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if not user:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Incorrect username or password",
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headers={"WWW-Authenticate": "Bearer"},
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)
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access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
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access_token = create_access_token(
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data={"sub": user.username}, expires_delta=access_token_expires
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)
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return {"access_token": access_token, "token_type": "bearer"}
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@app.get("/users/me/", response_model=User)
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async def read_users_me(
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current_user: Annotated[User, Depends(get_current_active_user)]
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):
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return current_user
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@app.get("/users/me/items/")
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async def read_own_items(
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current_user: Annotated[User, Depends(get_current_active_user)]
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):
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return [{"item_id": "Foo", "owner": current_user.username}]
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@ -4,15 +4,154 @@ from fastapi.middleware.cors import CORSMiddleware
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from langflow.api import router
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from langflow.database.base import create_db_and_tables
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from datetime import datetime, timedelta
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from typing import Annotated
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from fastapi import Depends, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from pydantic import BaseModel
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# to get a string like this run:
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# openssl rand -hex 32
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SECRET_KEY = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 30
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fake_users_db = {
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"johndoe": {
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"username": "johndoe",
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"full_name": "John Doe",
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"email": "johndoe@example.com",
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"hashed_password": "$2b$12$EixZaYVK1fsbw1ZfbX3OXePaWxn96p36WQoeG6Lruj3vjPGga31lW",
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"disabled": False,
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}
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}
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class Token(BaseModel):
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access_token: str
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token_type: str
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class TokenData(BaseModel):
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username: str | None = None
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class User(BaseModel):
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username: str
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email: str | None = None
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full_name: str | None = None
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disabled: bool | None = None
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class UserInDB(User):
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hashed_password: str
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
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def verify_password(plain_password, hashed_password):
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password):
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return pwd_context.hash(password)
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def get_user(db, username: str):
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if username in db:
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user_dict = db[username]
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return UserInDB(**user_dict)
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def authenticate_user(fake_db, username: str, password: str):
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user = get_user(fake_db, username)
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if not user:
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return False
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if not verify_password(password, user.hashed_password):
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return False
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return user
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def create_access_token(data: dict, expires_delta: timedelta | None = None):
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to_encode = data.copy()
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if expires_delta:
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expire = datetime.utcnow() + expires_delta
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else:
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expire = datetime.utcnow() + timedelta(minutes=15)
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to_encode.update({"exp": expire})
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encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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return encoded_jwt
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async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]):
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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username: str = payload.get("sub")
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if username is None:
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raise credentials_exception
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token_data = TokenData(username=username)
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except JWTError:
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raise credentials_exception
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user = get_user(fake_users_db, username=token_data.username)
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if user is None:
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raise credentials_exception
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return user
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async def get_current_active_user(current_user: Annotated[User, Depends(get_current_user)]):
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if current_user.disabled:
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raise HTTPException(status_code=400, detail="Inactive user")
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return current_user
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def create_app():
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"""Create the FastAPI app and include the router."""
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app = FastAPI()
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origins = [
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"*",
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]
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@app.post("/token", response_model=Token)
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async def login_for_access_token(form_data: Annotated[OAuth2PasswordRequestForm, Depends()]):
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user = authenticate_user(fake_users_db, form_data.username, form_data.password)
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if not user:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Incorrect username or password",
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headers={"WWW-Authenticate": "Bearer"},
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)
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access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
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access_token = create_access_token(
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data={"sub": user.username},
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expires_delta=access_token_expires
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)
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return {"access_token": access_token, "token_type": "bearer"}
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@app.get("/users/me/", response_model=User)
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async def read_users_me(
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current_user: Annotated[User, Depends(get_current_active_user)]
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):
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return current_user
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@app.get("/users/me/items/")
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async def read_own_items(
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current_user: Annotated[User, Depends(get_current_active_user)]
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):
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return [{"item_id": "Foo", "owner": current_user.username}]
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@app.get("/health")
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def get_health():
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@ -36,5 +175,4 @@ app = create_app()
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if __name__ == "__main__":
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import uvicorn
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uvicorn.run(app, host="127.0.0.1", port=7860)
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