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import base64
import hashlib
import hmac
import os
from datetime import datetime, timedelta, timezone
from typing import Any
import jwt
from fastapi import Depends, HTTPException, Request, status
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
from sqlalchemy import select
from sqlalchemy.orm import Session
from app.core.config import get_settings
from app.core.database import get_db
from app.models.user import User
bearer_scheme = HTTPBearer(auto_error=False)
MEDIA_AUTH_COOKIE = "docdoe_media_token"
def get_current_user_optional(
request: Request,
credentials: HTTPAuthorizationCredentials | None = Depends(bearer_scheme),
db: Session = Depends(get_db),
) -> User | None:
settings = get_settings()
if not settings.auth_enabled:
if not (
settings.environment == "development"
and settings.allow_insecure_dev_auth
):
raise HTTPException(
status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
detail="Authentication is not configured for this deployment.",
)
return get_or_create_dev_user(db)
token = (
credentials.credentials
if credentials is not None and credentials.scheme.lower() == "bearer"
else request.cookies.get(MEDIA_AUTH_COOKIE)
)
if not token:
return None
auth_provider = (settings.auth_provider or "jwt").strip().lower()
if auth_provider == "supabase":
return _user_from_supabase_token(db, token)
if auth_provider == "jwt":
return _user_from_local_jwt(db, token)
return None
def get_current_user(
user: User | None = Depends(get_current_user_optional),
) -> User | None:
return user
def require_user(user: User | None = Depends(get_current_user_optional)) -> User:
if user is None:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Authentication required",
headers={"WWW-Authenticate": "Bearer"},
)
return user
def get_or_create_dev_user(db: Session) -> User:
user = db.get(User, "usr_demo_student")
if user is not None:
if user.name != "Asnan" or user.email != "asnan@example.com":
user.name = "Asnan"
user.email = "asnan@example.com"
db.commit()
db.refresh(user)
return user
user = User(
id="usr_demo_student",
name="Asnan",
email="asnan@example.com",
role="student",
class_level="Plus Two",
syllabus="Kerala HSE",
preferred_language="English",
)
db.add(user)
db.commit()
db.refresh(user)
return user
def hash_password(password: str) -> str:
salt = os.urandom(16)
digest = hashlib.pbkdf2_hmac("sha256", password.encode("utf-8"), salt, 390_000)
return "pbkdf2_sha256$390000${}${}".format(
base64.b64encode(salt).decode("ascii"),
base64.b64encode(digest).decode("ascii"),
)
def verify_password(password: str, password_hash: str | None) -> bool:
if not password_hash:
return False
try:
algorithm, iterations_text, salt_text, digest_text = password_hash.split("$", 3)
if algorithm != "pbkdf2_sha256":
return False
salt = base64.b64decode(salt_text.encode("ascii"))
expected_digest = base64.b64decode(digest_text.encode("ascii"))
actual_digest = hashlib.pbkdf2_hmac(
"sha256",
password.encode("utf-8"),
salt,
int(iterations_text),
)
return hmac.compare_digest(actual_digest, expected_digest)
except Exception:
return False
def create_access_token(user: User) -> tuple[str, int]:
settings = get_settings()
expires_in_seconds = settings.access_token_expire_minutes * 60
expires_at = datetime.now(timezone.utc) + timedelta(seconds=expires_in_seconds)
payload: dict[str, Any] = {
"sub": user.id,
"email": user.email,
"role": user.role,
"ver": user.auth_version,
"exp": expires_at,
"iat": datetime.now(timezone.utc),
}
token = jwt.encode(payload, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)
return token, expires_in_seconds
def get_verified_auth_subject(token: str) -> str:
"""Return the verified identity-provider subject for an access token.
Most application routes only need the hydrated local ``User``. Destructive
identity operations also need the original provider subject so a legacy
email-matched local row cannot accidentally be used as a Supabase user ID.
"""
settings = get_settings()
auth_provider = (settings.auth_provider or "jwt").strip().lower()
if auth_provider == "supabase":
payload = _decode_supabase_jwt(token)
elif auth_provider == "jwt":
try:
payload = jwt.decode(
token,
settings.jwt_secret_key,
algorithms=[settings.jwt_algorithm],
options={"verify_aud": False},
)
except jwt.PyJWTError as exc:
raise _auth_error() from exc
else:
raise _auth_error()
subject = str(payload.get("sub") or "")
if not subject:
raise _auth_error()
return subject
def _user_from_local_jwt(db: Session, token: str) -> User | None:
settings = get_settings()
try:
payload = jwt.decode(
token,
settings.jwt_secret_key,
algorithms=[settings.jwt_algorithm],
options={"verify_aud": False},
)
except jwt.PyJWTError as exc:
raise _auth_error() from exc
user_id = str(payload.get("sub") or "")
if not user_id:
raise _auth_error()
user = db.get(User, user_id)
if user is None:
raise _auth_error()
try:
token_version = int(payload.get("ver", 1))
except (TypeError, ValueError) as exc:
raise _auth_error() from exc
if token_version != user.auth_version:
raise _auth_error()
return user
def _user_from_supabase_token(db: Session, token: str) -> User | None:
payload = _decode_supabase_jwt(token)
user_id = str(payload.get("sub") or "")
email = str(payload.get("email") or "").strip().lower()
if not user_id:
raise _auth_error()
user = db.get(User, user_id)
if user is not None:
return user
if email:
# A verified Supabase email is not proof that this is the same account
# as a legacy local-JWT row. Returning that row would merge identities
# and can expose its private state to a different provider subject.
existing_email_user = db.scalar(select(User).where(User.email == email))
if existing_email_user is not None:
raise _auth_error()
user = User(
id=user_id,
name=email.split("@")[0] if email else "Student",
email=email or f"{user_id}@supabase.local",
role="student",
preferred_language="English",
)
db.add(user)
db.commit()
db.refresh(user)
return user
def _decode_supabase_jwt(token: str) -> dict[str, Any]:
"""Verify the exact Supabase issuer and audience before trusting ``sub``.
DocDoe's current Supabase integration uses the configured legacy HS256 JWT
secret. A project using asymmetric signing must add JWKS verification before
changing the Supabase signing-key configuration.
"""
settings = get_settings()
if not settings.supabase_jwt_secret or not settings.supabase_url:
raise HTTPException(
status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
detail="Supabase auth is enabled but SUPABASE_URL or SUPABASE_JWT_SECRET is not configured.",
)
try:
payload = jwt.decode(
token,
settings.supabase_jwt_secret,
algorithms=["HS256"],
audience="authenticated",
issuer=f"{settings.supabase_url.rstrip('/')}/auth/v1",
)
except jwt.PyJWTError as exc:
raise _auth_error() from exc
return payload
def _auth_error() -> HTTPException:
return HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Invalid or expired authentication token",
headers={"WWW-Authenticate": "Bearer"},
)
|