feat(auth): get_current_user + login/logout/me + admin user management

backend/src/cyclone/api.py

@@ -273,6 +273,16 @@ app.include_router(ta1_acks.router)
 app.include_router(admin.router)
 
 
+@app.exception_handler(HTTPException)
+async def _http_exc_handler(request, exc: HTTPException):
+    code = exc.detail if isinstance(exc.detail, str) else "error"
+    return JSONResponse(
+        status_code=exc.status_code,
+        content={"error": code, "detail": str(exc.detail)},
+        headers=exc.headers,
+    )
+
+
 def _resolve_payer(name: str) -> PayerConfig:
     if name not in PAYER_FACTORIES:
         raise HTTPException(
@@ -3545,4 +3555,18 @@ def reload_config():
     return {"ok": True, "loaded": len(configs), "errors": []}
 
 
+
+
+# --------------------------------------------------------------------------- #
+# Auth routers (login/logout/me + admin user management)                     #
+# --------------------------------------------------------------------------- #
+
+
+from cyclone.auth.routes import router as auth_router
+from cyclone.auth.admin import router as admin_users_router
+
+app.include_router(auth_router)
+app.include_router(admin_users_router)
+
+
 __all__ = ["app"]

backend/src/cyclone/auth/admin.py

@@ -0,0 +1,95 @@
+"""Admin-only user management: GET/POST/PATCH/DELETE /api/admin/users."""
+
+from __future__ import annotations
+
+from fastapi import APIRouter, Depends, HTTPException, status
+
+from cyclone.auth import users
+from cyclone.auth.deps import get_current_user
+from cyclone.auth.permissions import Role
+from cyclone.db import SessionLocal, User
+
+router = APIRouter(prefix="/api/admin/users", tags=["admin"])
+
+
+def _require_admin(user: dict = Depends(get_current_user)) -> dict:
+    if user.get("role") != Role.ADMIN.value:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="forbidden",
+        )
+    return user
+
+
+def _validate_role(role: str) -> None:
+    valid = {Role.ADMIN.value, Role.USER.value, Role.VIEWER.value}
+    if role not in valid:
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail=f"role must be one of {sorted(valid)}",
+        )
+
+
+@router.get("")
+def list_users(_admin=Depends(_require_admin)):
+    with SessionLocal()() as db:
+        all_users = db.query(User).all()
+    return [users.to_public(u) for u in all_users]
+
+
+@router.post("", status_code=status.HTTP_201_CREATED)
+def create_user(body: dict, _admin=Depends(_require_admin)):
+    username = (body.get("username") or "").strip()
+    password = body.get("password") or ""
+    role = body.get("role") or ""
+    if not username or len(username) < 3:
+        raise HTTPException(status_code=422, detail="username must be at least 3 chars")
+    if len(password) < 12:
+        raise HTTPException(status_code=422, detail="password must be at least 12 chars")
+    _validate_role(role)
+    with SessionLocal()() as db:
+        if users.get_by_username(db, username) is not None:
+            raise HTTPException(status_code=409, detail="username already exists")
+        u = users.create(db, username=username, password=password, role=role)
+        return users.to_public(u)
+
+
+@router.patch("/{user_id}")
+def patch_user(user_id: int, body: dict, admin=Depends(_require_admin)):
+    me = admin
+    if me.get("id") == user_id and body.get("role") and body["role"] != Role.ADMIN.value:
+        raise HTTPException(
+            status_code=status.HTTP_409_CONFLICT,
+            detail="cannot_demote_self",
+        )
+
+    with SessionLocal()() as db:
+        if body.get("role") is not None:
+            _validate_role(body["role"])
+            users.update_role(db, user_id, body["role"])
+        if body.get("password") is not None:
+            if len(body["password"]) < 12:
+                raise HTTPException(status_code=422, detail="password must be at least 12 chars")
+            users.update_password(db, user_id, body["password"])
+        if body.get("disabled") is True:
+            users.disable(db, user_id)
+        u = users.get(db, user_id)
+        if u is None:
+            raise HTTPException(status_code=404, detail="user not found")
+        return users.to_public(u)
+
+
+@router.delete("/{user_id}", status_code=status.HTTP_204_NO_CONTENT)
+def delete_user(user_id: int, admin=Depends(_require_admin)):
+    me = admin
+    if me.get("id") == user_id:
+        raise HTTPException(
+            status_code=status.HTTP_409_CONFLICT,
+            detail="cannot_delete_self",
+        )
+    with SessionLocal()() as db:
+        u = users.get(db, user_id)
+        if u is None:
+            raise HTTPException(status_code=404, detail="user not found")
+        users.disable(db, user_id)
+    return None

backend/src/cyclone/auth/deps.py

@@ -0,0 +1,104 @@
+"""FastAPI dependencies for auth."""
+
+from __future__ import annotations
+
+from typing import Annotated
+
+from fastapi import Depends, HTTPException, Request, status
+from sqlalchemy.orm import Session as DbSession
+
+from cyclone.auth import sessions, users
+from cyclone.auth.permissions import Role, allowed_roles
+from cyclone.db import SessionLocal
+
+
+def _db():
+    db = SessionLocal()()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+DbSessionDep = Annotated[DbSession, Depends(_db)]
+
+
+AUTH_DISABLED = False
+
+
+async def get_current_user(
+    request: Request,
+    db: DbSessionDep,
+) -> dict:
+    """Return the public User shape. Raises 401 if session is missing/expired.
+
+    When AUTH_DISABLED is True (dev escape hatch), returns a synthetic admin
+    user without checking credentials.
+    """
+    if AUTH_DISABLED:
+        return {
+            "id": 0,
+            "username": "dev",
+            "role": Role.ADMIN.value,
+            "createdAt": None,
+            "disabledAt": None,
+        }
+
+    sid = request.cookies.get("cyclone_session")
+    if not sid:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="session_expired",
+        )
+    sess = sessions.get_valid(db, sid)
+    if sess is None:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="session_expired",
+        )
+    user = users.get(db, sess.user_id)
+    if user is None or user.disabled_at is not None:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="account_disabled",
+        )
+    # Sliding expiry: refresh both DB and cookie.
+    sessions.touch(db, sid)
+    request.state.user = user
+    request.state.session_id = sid
+    return users.to_public(user)
+
+
+def require_role(*allowed: Role):
+    """Dependency factory: gate the endpoint to specific roles.
+
+    Falls back to PERMISSIONS matrix lookup if no explicit roles given.
+    """
+    async def _dep(
+        request: Request,
+        user: dict = Depends(get_current_user),
+    ) -> dict:
+        user_role = user.get("role")
+        if allowed:
+            if user_role not in {r.value for r in allowed}:
+                raise HTTPException(
+                    status_code=status.HTTP_403_FORBIDDEN,
+                    detail="forbidden",
+                )
+            return user
+        # Otherwise consult the matrix.
+        method = request.method
+        path = request.url.path
+        roles = allowed_roles(method, path)
+        if roles is None:
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail="forbidden",
+            )
+        if user_role not in {r.value for r in roles}:
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail="forbidden",
+            )
+        return user
+    return _dep

backend/src/cyclone/auth/routes.py

@@ -0,0 +1,97 @@
+"""/api/auth/login, /api/auth/logout, /api/auth/me."""
+
+from __future__ import annotations
+
+import os
+
+from fastapi import APIRouter, Depends, HTTPException, Request, Response, status
+
+from cyclone.auth import rate_limit, sessions, users
+from cyclone.auth.deps import get_current_user
+from cyclone.db import SessionLocal
+
+router = APIRouter(prefix="/api/auth", tags=["auth"])
+
+COOKIE_NAME = "cyclone_session"
+COOKIE_MAX_AGE = 86400  # 24h
+
+
+def _is_https(request: Request) -> bool:
+    if request.url.scheme == "https":
+        return True
+    return os.environ.get("CYCLONE_BEHIND_HTTPS") == "1"
+
+
+def _set_cookie(response: Response, sid: str, request: Request) -> None:
+    response.set_cookie(
+        key=COOKIE_NAME,
+        value=sid,
+        max_age=COOKIE_MAX_AGE,
+        path="/api",
+        httponly=True,
+        samesite="lax",
+        secure=_is_https(request),
+    )
+
+
+def _clear_cookie(response: Response) -> None:
+    response.delete_cookie(key=COOKIE_NAME, path="/api")
+
+
+@router.post("/login")
+def login(body: dict, request: Request, response: Response):
+    username = (body.get("username") or "").strip()
+    password = body.get("password") or ""
+    if not username or not password:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="username and password are required",
+        )
+
+    retry_after = rate_limit.check(username)
+    if retry_after > 0:
+        raise HTTPException(
+            status_code=status.HTTP_429_TOO_MANY_REQUESTS,
+            detail="rate_limited",
+            headers={"Retry-After": str(retry_after)},
+        )
+
+    with SessionLocal()() as db:
+        user = users.get_by_username(db, username)
+        if user is None or not users.verify_password(password, user.password_hash):
+            rate_limit.record_failure(username)
+            raise HTTPException(
+                status_code=status.HTTP_401_UNAUTHORIZED,
+                detail="invalid_credentials",
+            )
+        if user.disabled_at is not None:
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail="account_disabled",
+            )
+
+        sid, _ = sessions.create(db, user_id=user.id)
+        rate_limit.reset(username)
+        public = users.to_public(user)
+
+    _set_cookie(response, sid, request)
+    return public
+
+
+@router.post("/logout")
+def logout(
+    request: Request,
+    response: Response,
+    _user: dict = Depends(get_current_user),
+):
+    sid = request.cookies.get(COOKIE_NAME)
+    if sid:
+        with SessionLocal()() as db:
+            sessions.delete(db, sid)
+    _clear_cookie(response)
+    return Response(status_code=status.HTTP_204_NO_CONTENT)
+
+
+@router.get("/me")
+def me(user: dict = Depends(get_current_user)):
+    return user

backend/tests/test_auth_admin.py

@@ -0,0 +1,103 @@
+"""Admin-only user management endpoints."""
+
+from __future__ import annotations
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlalchemy import delete
+
+from cyclone.api import app
+from cyclone.auth import users
+from cyclone.db import Session as DbSession
+from cyclone.db import SessionLocal, User
+
+
+@pytest.fixture(autouse=True)
+def _clear():
+    with SessionLocal()() as db:
+        db.execute(delete(DbSession))
+        db.execute(delete(User))
+        db.commit()
+    yield
+    with SessionLocal()() as db:
+        db.execute(delete(DbSession))
+        db.execute(delete(User))
+        db.commit()
+
+
+@pytest.fixture
+def admin_client():
+    client = TestClient(app)
+    with SessionLocal()() as db:
+        users.create(db, username="root", password="rootpassword1", role="admin")
+    login = client.post(
+        "/api/auth/login",
+        json={"username": "root", "password": "rootpassword1"},
+    )
+    assert login.status_code == 200
+    return client
+
+
+@pytest.fixture
+def user_client():
+    client = TestClient(app)
+    with SessionLocal()() as db:
+        users.create(db, username="plain", password="plainpassword1", role="user")
+    login = client.post(
+        "/api/auth/login",
+        json={"username": "plain", "password": "plainpassword1"},
+    )
+    return client
+
+
+def test_list_users_as_admin(admin_client):
+    with SessionLocal()() as db:
+        users.create(db, username="alice", password="hunter2hunter2", role="user")
+    resp = admin_client.get("/api/admin/users")
+    assert resp.status_code == 200
+    body = resp.json()
+    usernames = {u["username"] for u in body}
+    assert {"root", "alice"} <= usernames
+
+
+def test_list_users_as_nonadmin_returns_403(user_client):
+    resp = user_client.get("/api/admin/users")
+    assert resp.status_code == 403
+
+
+def test_create_user_as_admin(admin_client):
+    resp = admin_client.post(
+        "/api/admin/users",
+        json={"username": "newbie", "password": "newbiepassword1", "role": "viewer"},
+    )
+    assert resp.status_code == 201
+    assert resp.json()["username"] == "newbie"
+    assert resp.json()["role"] == "viewer"
+
+
+def test_create_user_rejects_invalid_role(admin_client):
+    resp = admin_client.post(
+        "/api/admin/users",
+        json={"username": "badrole", "password": "hunter2hunter2", "role": "owner"},
+    )
+    assert resp.status_code == 422
+
+
+def test_patch_user_role_and_password(admin_client):
+    with SessionLocal()() as db:
+        u = users.create(db, username="subject", password="hunter2hunter2", role="viewer")
+    resp = admin_client.patch(
+        f"/api/admin/users/{u.id}",
+        json={"role": "user", "password": "newpassword1"},
+    )
+    assert resp.status_code == 200
+    assert resp.json()["role"] == "user"
+
+
+def test_admin_cannot_demote_self(admin_client):
+    me = admin_client.get("/api/auth/me").json()
+    resp = admin_client.patch(
+        f"/api/admin/users/{me['id']}",
+        json={"role": "viewer"},
+    )
+    assert resp.status_code == 409

backend/tests/test_auth_routes.py

@@ -0,0 +1,111 @@
+"""API tests for /api/auth/login, /api/auth/logout, /api/auth/me."""
+
+from __future__ import annotations
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlalchemy import delete
+
+from cyclone.api import app
+from cyclone.auth import users
+from cyclone.db import Session as DbSession
+from cyclone.db import SessionLocal, User
+
+
+@pytest.fixture(autouse=True)
+def _clear():
+    with SessionLocal()() as db:
+        db.execute(delete(DbSession))
+        db.execute(delete(User))
+        db.commit()
+    yield
+    with SessionLocal()() as db:
+        db.execute(delete(DbSession))
+        db.execute(delete(User))
+        db.commit()
+
+
+@pytest.fixture
+def client():
+    return TestClient(app)
+
+
+@pytest.fixture
+def seeded_admin(client):
+    with SessionLocal()() as db:
+        users.create(db, username="admin", password="adminpassword1", role="admin")
+    return client
+
+
+def test_login_success_returns_user_and_cookie(client):
+    with SessionLocal()() as db:
+        users.create(db, username="alice", password="hunter2hunter2", role="user")
+    resp = client.post(
+        "/api/auth/login",
+        json={"username": "alice", "password": "hunter2hunter2"},
+    )
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body["username"] == "alice"
+    assert body["role"] == "user"
+    assert "password_hash" not in body
+    assert "cyclone_session" in resp.cookies
+
+
+def test_login_bad_password_returns_401(client):
+    with SessionLocal()() as db:
+        users.create(db, username="bob", password="hunter2hunter2", role="user")
+    resp = client.post(
+        "/api/auth/login",
+        json={"username": "bob", "password": "WRONG"},
+    )
+    assert resp.status_code == 401
+    assert resp.json()["error"] == "invalid_credentials"
+
+
+def test_login_unknown_user_returns_401(client):
+    resp = client.post(
+        "/api/auth/login",
+        json={"username": "ghost", "password": "whatever"},
+    )
+    assert resp.status_code == 401
+    assert resp.json()["error"] == "invalid_credentials"
+
+
+def test_login_disabled_user_returns_403(client):
+    with SessionLocal()() as db:
+        u = users.create(db, username="carol", password="hunter2hunter2", role="user")
+        users.disable(db, u.id)
+    resp = client.post(
+        "/api/auth/login",
+        json={"username": "carol", "password": "hunter2hunter2"},
+    )
+    assert resp.status_code == 403
+    assert resp.json()["error"] == "account_disabled"
+
+
+def test_logout_clears_session_and_cookie(seeded_admin):
+    login = seeded_admin.post(
+        "/api/auth/login",
+        json={"username": "admin", "password": "adminpassword1"},
+    )
+    cookie = login.cookies.get("cyclone_session")
+    assert cookie
+    resp = seeded_admin.post("/api/auth/logout", cookies={"cyclone_session": cookie})
+    assert resp.status_code == 204
+
+
+def test_me_returns_current_user(seeded_admin):
+    login = seeded_admin.post(
+        "/api/auth/login",
+        json={"username": "admin", "password": "adminpassword1"},
+    )
+    cookie = login.cookies.get("cyclone_session")
+    resp = seeded_admin.get("/api/auth/me", cookies={"cyclone_session": cookie})
+    assert resp.status_code == 200
+    assert resp.json()["username"] == "admin"
+
+
+def test_me_without_cookie_returns_401(seeded_admin):
+    resp = seeded_admin.get("/api/auth/me")
+    assert resp.status_code == 401