first commit

backend/app/auth.py

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+import uuid
+from datetime import datetime, timedelta, timezone
+
+import jwt
+from fastapi import Cookie, Depends, HTTPException, status
+from pwdlib import PasswordHash
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from .config import settings
+from .database import get_db
+from .models import UserAccount
+
+COOKIE_NAME = "urmi_session"
+ADMIN_COOKIE_NAME = "urmi_admin_session"
+password_hash = PasswordHash.recommended()
+
+
+def normalize_email(email: str) -> str:
+    return email.strip().casefold()
+
+
+def create_token(user_id: uuid.UUID, purpose: str = "session", minutes: int | None = None) -> str:
+    now = datetime.now(timezone.utc)
+    return jwt.encode(
+        {
+            "sub": str(user_id),
+            "purpose": purpose,
+            "iat": now,
+            "exp": now + timedelta(minutes=minutes or settings.access_token_minutes),
+        },
+        settings.auth_secret,
+        algorithm="HS256",
+    )
+
+
+def decode_token(token: str, purpose: str = "session") -> dict:
+    try:
+        payload = jwt.decode(token, settings.auth_secret, algorithms=["HS256"])
+        if payload.get("purpose") != purpose:
+            raise ValueError("invalid token purpose")
+        return payload
+    except (jwt.PyJWTError, ValueError) as exc:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid session") from exc
+
+
+def current_user(
+    urmi_session: str | None = Cookie(default=None, alias=COOKIE_NAME),
+    db: Session = Depends(get_db),
+) -> UserAccount:
+    if not urmi_session:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Authentication required")
+    payload = decode_token(urmi_session)
+    try:
+        user_id = uuid.UUID(payload["sub"])
+    except (KeyError, ValueError) as exc:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid session") from exc
+    user = db.scalar(select(UserAccount).where(UserAccount.id == user_id))
+    if not user or user.status != "active":
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Account unavailable")
+    return user
+
+
+def create_admin_token(username: str) -> str:
+    now = datetime.now(timezone.utc)
+    return jwt.encode(
+        {
+            "sub": username,
+            "purpose": "admin_session",
+            "iat": now,
+            "exp": now + timedelta(minutes=settings.access_token_minutes),
+        },
+        settings.auth_secret,
+        algorithm="HS256",
+    )
+
+
+def current_admin(urmi_admin_session: str | None = Cookie(default=None, alias=ADMIN_COOKIE_NAME)) -> str:
+    if not urmi_admin_session:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Admin authentication required")
+    payload = decode_token(urmi_admin_session, purpose="admin_session")
+    username = payload.get("sub")
+    if username != settings.admin_username:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid admin session")
+    return username