Auth: Add basic JWT authorization

.env.example

@@ -10,3 +10,9 @@ PYTHONPATH=/app
 
 # Development settings
 DEBUG=true
+
+# Auth
+# Signs access tokens. Generate: python -c "import secrets; print(secrets.token_urlsafe(48))"
+JWT_SECRET=change-me-to-a-long-random-string
+# Set to true in production (HTTPS only), the web client's refresh cookie is then Secure
+COOKIE_SECURE=false

CLAUDE.md

@@ -73,13 +73,19 @@ docker compose exec fastapi-app mypy app/
 - `Approach` - single set with weight and reps
 
 **API Structure** (backend, JSON only):
-- `/api/v1/trainings/` (GET list, GET/PUT/DELETE `{id}/`; PUT replaces the whole training), `/api/v1/exercises/`, `/api/v1/exercises/progress/?name=`, `/api/v1/users/` (POST, GET list with `?role=`, GET/PATCH/DELETE `{id}/`; role is `trainer` or `trainee`, passwords are hashed with scrypt, no login yet), `/api/v1/parser/parse/`, `/api/v1/health/`
+- `/api/v1/auth/` (login, refresh, logout, me), `/api/v1/trainings/` (GET list, GET/PUT/DELETE `{id}/`; PUT replaces the whole training), `/api/v1/exercises/`, `/api/v1/exercises/progress/?name=`, `/api/v1/users/` (POST, GET list with `?role=`, GET/PATCH/DELETE `{id}/`; role is `trainer` or `trainee`, passwords are hashed with scrypt, no login yet), `/api/v1/parser/parse/`, `/api/v1/health/`
 
 **Frontend** (`frontend/`):
-- `index.html`, `exercises.html`, `parse.html`, `users.html` - pages; `js/common.js` (API + DOM helpers), `js/table.js` (DataTables 3 wrapper), one module per page, `js/modal.js` (Bootstrap modal shell), `js/edit-dialog.js` + `js/edit-form.js` (training edit modal), `js/user-dialog.js` (user create/edit modal)
+- `index.html`, `exercises.html`, `parse.html`, `users.html`, `login.html` - pages; `js/auth.js` (tokens, refresh, logout) and `js/page.js` (every page imports it first: requires a login, fills the sidebar, exports `user`); `js/common.js` (API + DOM helpers), `js/table.js` (DataTables 3 wrapper), one module per page, `js/modal.js` (Bootstrap modal shell), `js/edit-dialog.js` + `js/edit-form.js` (training edit modal), `js/user-dialog.js` (user create/edit modal)
 - `vendor/` - Bootstrap (CSS + JS bundle), Chart.js and DataTables 3 (jQuery-free): the only third-party code
 - `nginx.conf` - serves static files and proxies `/api/` to `fastapi-app:8000` (same origin, no CORS)
 
+### Authentication
+
+Access token: JWT (HS256, 15 min, `JWT_SECRET` in `.env`), sent as `Authorization: Bearer`. Refresh token: random opaque string, 30 days, only its hash is stored (`refresh_tokens`); it works once (rotation), reusing a used one revokes the whole chain. `POST /auth/login/` with `client: "web"` puts the refresh token only into an httpOnly `SameSite=Strict` cookie (path `/api/v1/auth`, `Secure` when `COOKIE_SECURE=true`, set it in production with HTTPS); `client: "native"` (iOS) returns it in the body for the Keychain. The web frontend keeps the access token in `sessionStorage`.
+
+There is no registration: only a superuser creates users (`/api/v1/users/`). The first login: `docker compose exec fastapi-app python -m app.cli set-password EMAIL [--superuser]`. Access: a superuser sees and changes everything; a trainee sees and changes their trainings; a trainer only sees the trainings where they are the trainer. Exercise statistics are about the user's own trainings (`?trainee_id=` narrows to one trainee).
+
 ### Database
 
 Trainings belong to a trainee (`trainings.trainee_id`, required) and optionally have a trainer (`trainings.trainer_id`, NULL = solo); both are users (role `trainee` / `trainer`). A user with trainings can't be deleted. `python -m app.cli import` takes the trainer from the note header and matches it with a trainer user by "First Last".

backend/app/api/deps.py

@@ -1,9 +1,17 @@
-from fastapi import Depends
+import jwt
+from fastapi import Depends, HTTPException
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.database.connection import get_session
 from app.core.database.repository import TrainingRepository
+from app.core.database.token_repository import RefreshTokenRepository
 from app.core.database.user_repository import UserRepository
+from app.core.dto.user import UserDTO
+from app.core.security import decode_access_token
+
+# auto_error=False: a missing header gets the same 401 as a bad token
+bearer_scheme = HTTPBearer(auto_error=False)
 
 
 def get_training_repository(
@@ -16,3 +24,38 @@ def get_user_repository(
     session: AsyncSession = Depends(get_session),
 ) -> UserRepository:
     return UserRepository(session)
+
+
+def get_token_repository(
+    session: AsyncSession = Depends(get_session),
+) -> RefreshTokenRepository:
+    return RefreshTokenRepository(session)
+
+
+async def get_current_user(
+    credentials: HTTPAuthorizationCredentials | None = Depends(bearer_scheme),
+    repository: UserRepository = Depends(get_user_repository),
+) -> UserDTO:
+    """The user of the access token. The user is read from the database on every request, so
+    a deactivated user loses access at once, not when the token expires."""
+    unauthorized = HTTPException(
+        status_code=401,
+        detail="Not authenticated",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    if credentials is None:
+        raise unauthorized
+    try:
+        user_id = int(decode_access_token(credentials.credentials)["sub"])
+    except (jwt.PyJWTError, ValueError):
+        raise unauthorized
+    user = await repository.get(user_id)
+    if user is None or not user.is_active:
+        raise unauthorized
+    return user
+
+
+async def require_superuser(user: UserDTO = Depends(get_current_user)) -> UserDTO:
+    if not user.is_superuser:
+        raise HTTPException(status_code=403, detail="Superuser only")
+    return user

backend/app/api/v1/auth.py

@@ -0,0 +1,123 @@
+import uuid
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+from fastapi import APIRouter, Cookie, Depends, HTTPException, Response
+
+from app.api.deps import get_current_user, get_token_repository, get_user_repository
+from app.config import settings
+from app.core.database.token_repository import RefreshTokenRepository
+from app.core.database.user_repository import UserRepository
+from app.core.dto.user import UserDTO
+from app.core.security import (
+    DUMMY_PASSWORD_HASH,
+    create_access_token,
+    hash_token,
+    new_refresh_token,
+    verify_password,
+)
+from app.schemas.auth import LoginRequest, RefreshRequest, TokenResponse
+
+router = APIRouter()
+
+REFRESH_COOKIE = "refresh_token"
+# The cookie is sent only to the auth endpoints
+COOKIE_PATH = "/api/v1/auth"
+
+
+def _invalid_credentials() -> HTTPException:
+    return HTTPException(status_code=401, detail="Invalid email or password")
+
+
+def _set_refresh_cookie(response: Response, token: str) -> None:
+    response.set_cookie(
+        REFRESH_COOKIE,
+        token,
+        max_age=settings.REFRESH_TOKEN_TTL_DAYS * 24 * 3600,
+        path=COOKIE_PATH,
+        httponly=True,
+        secure=settings.COOKIE_SECURE,
+        samesite="strict",
+    )
+
+
+async def _issue_tokens(
+    user: UserDTO,
+    family_id: str,
+    web: bool,
+    response: Response,
+    tokens: RefreshTokenRepository,
+) -> TokenResponse:
+    refresh_token = new_refresh_token()
+    await tokens.create(
+        user_id=user.id,
+        family_id=family_id,
+        token_hash=hash_token(refresh_token),
+        expires_at=datetime.now(timezone.utc) + timedelta(days=settings.REFRESH_TOKEN_TTL_DAYS),
+    )
+    if web:
+        _set_refresh_cookie(response, refresh_token)
+    return TokenResponse(
+        access_token=create_access_token(user.id, user.role.value),
+        expires_in=settings.ACCESS_TOKEN_TTL_MINUTES * 60,
+        refresh_token=None if web else refresh_token,
+    )
+
+
+@router.post("/login/", response_model=TokenResponse)
+async def login(
+    payload: LoginRequest,
+    response: Response,
+    users: UserRepository = Depends(get_user_repository),
+    tokens: RefreshTokenRepository = Depends(get_token_repository),
+):
+    found = await users.get_credentials(payload.email.strip().lower())
+    # Check the password even for an unknown email: the response time must not tell them apart
+    user, password_hash = found if found else (None, DUMMY_PASSWORD_HASH)
+    if not verify_password(payload.password, password_hash) or user is None or not user.is_active:
+        raise _invalid_credentials()
+
+    await users.update(user.id, {"last_login": datetime.now(timezone.utc)})
+    return await _issue_tokens(user, uuid.uuid4().hex, payload.client == "web", response, tokens)
+
+
+@router.post("/refresh/", response_model=TokenResponse)
+async def refresh(
+    response: Response,
+    payload: Optional[RefreshRequest] = None,
+    cookie_token: Optional[str] = Cookie(default=None, alias=REFRESH_COOKIE),
+    users: UserRepository = Depends(get_user_repository),
+    tokens: RefreshTokenRepository = Depends(get_token_repository),
+):
+    """Exchange a refresh token for a new pair. The old refresh token stops working."""
+    body_token = payload.refresh_token if payload else None
+    token = body_token or cookie_token
+    web = body_token is None
+    claim = await tokens.claim(hash_token(token)) if token else None
+    user = await users.get(claim.user_id) if claim else None
+    if claim is None or user is None or not user.is_active:
+        if claim is not None:
+            await tokens.revoke_all_of_user(claim.user_id)
+        response.delete_cookie(REFRESH_COOKIE, path=COOKIE_PATH)
+        raise HTTPException(status_code=401, detail="Invalid refresh token")
+    return await _issue_tokens(user, claim.family_id, web, response, tokens)
+
+
+@router.post("/logout/")
+async def logout(
+    response: Response,
+    payload: Optional[RefreshRequest] = None,
+    cookie_token: Optional[str] = Cookie(default=None, alias=REFRESH_COOKIE),
+    tokens: RefreshTokenRepository = Depends(get_token_repository),
+):
+    """Revoke the refresh token of this login. The access token expires by itself in minutes."""
+    token = (payload.refresh_token if payload else None) or cookie_token
+    if token:
+        await tokens.revoke_family_of(hash_token(token))
+    response.delete_cookie(REFRESH_COOKIE, path=COOKIE_PATH)
+    return {"status": "ok"}
+
+
+@router.get("/me/", response_model=UserDTO)
+async def me(user: UserDTO = Depends(get_current_user)):
+    return user

backend/app/api/v1/exercises.py

@@ -2,9 +2,10 @@ from typing import List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException
 
-from app.api.deps import get_training_repository
+from app.api.deps import get_current_user, get_training_repository
 from app.core.database.repository import TrainingRepository
 from app.core.dto.training import ExerciseNameDTO
+from app.core.dto.user import UserDTO, UserRole
 from app.core.metrics import Record, summarize
 from app.schemas.exercises import (
     ExerciseProgressResponse,
@@ -16,36 +17,57 @@ from app.schemas.exercises import (
 router = APIRouter()
 
 
+def stats_trainee_id(user: UserDTO, trainee_id: Optional[int]) -> Optional[int]:
+    """Whose trainings the statistics are about: a trainee's own unless another one is asked
+    for (which, like everything else, is limited to the trainings the user may see)."""
+    if trainee_id is None and user.role == UserRole.trainee:
+        return user.id
+    return trainee_id
+
+
 def record_response(record: Optional[Record]) -> Optional[RecordResponse]:
     return RecordResponse(value=record.value, date=record.date) if record else None
 
 
 @router.get("/", response_model=List[ExerciseNameDTO])
 async def list_exercise_names(
+    trainee_id: Optional[int] = None,
+    user: UserDTO = Depends(get_current_user),
     repository: TrainingRepository = Depends(get_training_repository),
 ):
     """Distinct exercise names with the number of times each was done."""
-    return await repository.list_exercise_names()
+    return await repository.list_exercise_names(
+        viewer=user, trainee_id=stats_trainee_id(user, trainee_id)
+    )
 
 
 @router.get("/progress/", response_model=ExerciseProgressResponse)
 async def exercise_progress(
     name: str,
+    trainee_id: Optional[int] = None,
+    user: UserDTO = Depends(get_current_user),
     repository: TrainingRepository = Depends(get_training_repository),
 ):
     """The whole history of the exercise with progress metrics.
 
     The name is matched exactly, but case-insensitively: what was typed may differ in case.
     """
+    trainee_id = stats_trainee_id(user, trainee_id)
     names_by_casefold = {
         item.name.casefold(): item.name
-        for item in await repository.list_exercise_names()
+        for item in await repository.list_exercise_names(
+            viewer=user, trainee_id=trainee_id
+        )
     }
     exact_name = names_by_casefold.get(name.strip().casefold())
     if exact_name is None:
         raise HTTPException(status_code=404, detail="Exercise not found")
 
-    progress = summarize(await repository.exercise_history(exact_name))
+    progress = summarize(
+        await repository.exercise_history(
+            exact_name, viewer=user, trainee_id=trainee_id
+        )
+    )
     return ExerciseProgressResponse(
         name=exact_name,
         weighted=progress.weighted,
@@ -59,6 +81,7 @@ async def exercise_progress(
         rows=[
             SessionRowResponse(
                 training_id=row.session.training_id,
+                trainee_id=row.session.trainee_id,
                 date=row.session.date,
                 trainer=row.session.trainer,
                 splitted_weight=row.session.splitted_weight,

backend/app/api/v1/router.py

@@ -1,10 +1,18 @@
-from fastapi import APIRouter
-from app.api.v1 import exercises, parser, health, trainings, users
+from fastapi import APIRouter, Depends
+
+from app.api.deps import get_current_user
+from app.api.v1 import auth, exercises, parser, health, trainings, users
 
 api_router = APIRouter()
 
 api_router.include_router(health.router, prefix="/health", tags=["health"])
-api_router.include_router(parser.router, prefix="/parser", tags=["parser"])
+api_router.include_router(auth.router, prefix="/auth", tags=["auth"])
+api_router.include_router(
+    parser.router,
+    prefix="/parser",
+    tags=["parser"],
+    dependencies=[Depends(get_current_user)],
+)
 api_router.include_router(trainings.router, prefix="/trainings", tags=["trainings"])
 api_router.include_router(exercises.router, prefix="/exercises", tags=["exercises"])
 api_router.include_router(users.router, prefix="/users", tags=["users"])

backend/app/api/v1/trainings.py

@@ -2,30 +2,23 @@ from typing import List
 
 from fastapi import APIRouter, Depends, HTTPException
 
-from app.api.deps import get_training_repository, get_user_repository
+from app.api.deps import (
+    get_current_user,
+    get_training_repository,
+    get_user_repository,
+    require_superuser,
+)
 from app.core.database.repository import TrainingRepository
 from app.core.database.user_repository import UserRepository
 from app.core.dto.training import TrainingDTO
-from app.core.dto.user import UserRole
-from app.schemas.trainings import TrainingUpdate
+from app.core.dto.user import UserDTO, UserRole
 from app.core.parsers.obsidian import parse_training_data
+from app.schemas.trainings import TrainingUpdate
 
 
 router = APIRouter()
 
 
-@router.get("/obsidian/")
-async def obsidian_trainings_list():
-    return {"data": parse_training_data()}
-
-
-@router.get("/", response_model=List[TrainingDTO])
-async def get_trainings_list(
-    repository: TrainingRepository = Depends(get_training_repository),
-):
-    return await repository.list()
-
-
 async def _check_participant(
     repository: UserRepository, user_id: int, role: UserRole
 ) -> None:
@@ -36,12 +29,42 @@ async def _check_participant(
         )
 
 
+async def _get_editable_training(
+    training_id: int, user: UserDTO, repository: TrainingRepository
+) -> TrainingDTO:
+    """A training the user may change: their own (as the trainee), or any for a superuser.
+
+    The trainer can only see the training. A training the user can't see at all is a 404.
+    """
+    training = await repository.get(training_id, viewer=user)
+    if training is None:
+        raise HTTPException(status_code=404, detail="Training not found")
+    if not (user.is_superuser or training.trainee_id == user.id):
+        raise HTTPException(status_code=403, detail="Only the trainee can change a training")
+    return training
+
+
+@router.get("/obsidian/", dependencies=[Depends(require_superuser)])
+async def obsidian_trainings_list():
+    return {"data": parse_training_data()}
+
+
+@router.get("/", response_model=List[TrainingDTO])
+async def get_trainings_list(
+    user: UserDTO = Depends(get_current_user),
+    repository: TrainingRepository = Depends(get_training_repository),
+):
+    """Trainings the user takes part in (all of them for a superuser)."""
+    return await repository.list(viewer=user)
+
+
 @router.get("/{training_id}/", response_model=TrainingDTO)
 async def get_training(
     training_id: int,
+    user: UserDTO = Depends(get_current_user),
     repository: TrainingRepository = Depends(get_training_repository),
 ):
-    training = await repository.get(training_id)
+    training = await repository.get(training_id, viewer=user)
     if training is None:
         raise HTTPException(status_code=404, detail="Training not found")
     return training
@@ -51,11 +74,18 @@ async def get_training(
 async def update_training(
     training_id: int,
     payload: TrainingUpdate,
+    user: UserDTO = Depends(get_current_user),
     repository: TrainingRepository = Depends(get_training_repository),
     user_repository: UserRepository = Depends(get_user_repository),
 ):
     """Replace the training: its date, trainee, trainer, exercises and approaches."""
-    await _check_participant(user_repository, payload.trainee_id, UserRole.trainee)
+    current = await _get_editable_training(training_id, user, repository)
+    if payload.trainee_id != current.trainee_id:
+        if not user.is_superuser:
+            raise HTTPException(
+                status_code=403, detail="Only a superuser can change the trainee"
+            )
+        await _check_participant(user_repository, payload.trainee_id, UserRole.trainee)
     if payload.trainer_id is not None:
         await _check_participant(user_repository, payload.trainer_id, UserRole.trainer)
     training = TrainingDTO.model_validate(payload.model_dump())
@@ -67,9 +97,9 @@ async def update_training(
 @router.delete("/{training_id}/")
 async def delete_training(
     training_id: int,
+    user: UserDTO = Depends(get_current_user),
     repository: TrainingRepository = Depends(get_training_repository),
 ):
-    deleted = await repository.delete([training_id])
-    if not deleted:
-        raise HTTPException(status_code=404, detail="Training not found")
+    await _get_editable_training(training_id, user, repository)
+    await repository.delete([training_id])
     return {"status": "ok"}

backend/app/api/v1/users.py

@@ -2,13 +2,13 @@ from typing import List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, status
 
-from app.api.deps import get_user_repository
+from app.api.deps import get_current_user, get_user_repository, require_superuser
 from app.core.database.user_repository import (
     EmailTakenError,
     UserInUseError,
     UserRepository,
 )
-from app.core.dto.user import UserDTO, UserRole
+from app.core.dto.user import TrainerDTO, UserDTO, UserRole
 from app.core.security import hash_password
 from app.schemas.users import UserCreate, UserUpdate
 
@@ -17,7 +17,7 @@ router = APIRouter()
 EMAIL_TAKEN = HTTPException(status_code=409, detail="Email already registered")
 
 
-@router.post("/", response_model=UserDTO, status_code=status.HTTP_201_CREATED)
+@router.post("/", response_model=UserDTO, status_code=status.HTTP_201_CREATED, dependencies=[Depends(require_superuser)])
 async def create_user(
     payload: UserCreate,
     repository: UserRepository = Depends(get_user_repository),
@@ -34,7 +34,7 @@ async def create_user(
         raise EMAIL_TAKEN
 
 
-@router.get("/", response_model=List[UserDTO])
+@router.get("/", response_model=List[UserDTO], dependencies=[Depends(require_superuser)])
 async def list_users(
     role: Optional[UserRole] = None,
     repository: UserRepository = Depends(get_user_repository),
@@ -42,7 +42,23 @@ async def list_users(
     return await repository.list(role)
 
 
-@router.get("/{user_id}/", response_model=UserDTO)
+@router.get("/trainers/", response_model=List[TrainerDTO])
+async def list_trainers(
+    _: UserDTO = Depends(get_current_user),
+    repository: UserRepository = Depends(get_user_repository),
+):
+    """Trainers to pick from in a training form: any signed-in user may ask for them."""
+    return [
+        TrainerDTO(
+            id=user.id,
+            name=f"{user.first_name} {user.last_name}".strip() or user.email,
+        )
+        for user in await repository.list(UserRole.trainer)
+        if user.is_active
+    ]
+
+
+@router.get("/{user_id}/", response_model=UserDTO, dependencies=[Depends(require_superuser)])
 async def get_user(
     user_id: int,
     repository: UserRepository = Depends(get_user_repository),
@@ -53,7 +69,7 @@ async def get_user(
     return user
 
 
-@router.patch("/{user_id}/", response_model=UserDTO)
+@router.patch("/{user_id}/", response_model=UserDTO, dependencies=[Depends(require_superuser)])
 async def update_user(
     user_id: int,
     payload: UserUpdate,
@@ -74,11 +90,14 @@ async def update_user(
     return user
 
 
-@router.delete("/{user_id}/")
+@router.delete("/{user_id}/", dependencies=[Depends(require_superuser)])
 async def delete_user(
     user_id: int,
+    current: UserDTO = Depends(require_superuser),
     repository: UserRepository = Depends(get_user_repository),
 ):
+    if user_id == current.id:
+        raise HTTPException(status_code=400, detail="You can't delete yourself")
     try:
         deleted = await repository.delete(user_id)
     except UserInUseError:

backend/app/cli.py

@@ -1,23 +1,31 @@
 """Command line helpers.
 
     python -m app.cli import [--replace] [--trainee-email EMAIL]
+    python -m app.cli set-password EMAIL [--superuser]
 
 Imports all trainings from the Obsidian and Apple notes into the database as trainings of one
 trainee. The trainer from a note header is matched with a user of the trainer role by
 "First Last" ("соло" means no trainer). The schema must already exist (`alembic upgrade head`).
+
+`set-password` asks for a new password of the user (and with --superuser makes them a
+superuser). It is the way to get a working login: users are created only by superusers, and
+the users made by migrations have random passwords.
 """
 
 import argparse
 import asyncio
+import getpass
 import logging
-from typing import List, Optional, Set
+from typing import Any, Dict, List, Optional, Set
 
 from app.config import settings
 from app.core.database.connection import create_engine, create_session_factory
 from app.core.database.repository import TrainingRepository
+from app.core.database.token_repository import RefreshTokenRepository
 from app.core.database.user_repository import UserRepository
 from app.core.dto.training import TrainingDTO
 from app.core.dto.user import UserRole
+from app.core.security import hash_password
 from app.core.parsers.apple import AppleNotesParser
 from app.core.parsers.obsidian import ObsidianNotesParser
 
@@ -90,6 +98,26 @@ async def import_notes(replace: bool, trainee_email: Optional[str]) -> None:
     print(f"Imported {len(trainings)} trainings")
 
 
+async def set_password(email: str, password: str, superuser: bool) -> None:
+    engine = create_engine(settings.get_postgres_database_url())
+    try:
+        async with create_session_factory(engine)() as session:
+            users = UserRepository(session)
+            found = await users.get_credentials(email.strip().lower())
+            if found is None:
+                raise SystemExit(f"No user with email {email}")
+            user, _ = found
+            values: Dict[str, Any] = {"password_hash": hash_password(password)}
+            if superuser:
+                values["is_superuser"] = True
+            await users.update(user.id, values)
+            # Whoever was logged in with the old password is logged out
+            await RefreshTokenRepository(session).revoke_all_of_user(user.id)
+    finally:
+        await engine.dispose()
+    print(f"Password of {email} is changed")
+
+
 def main() -> None:
     logging.basicConfig(level=logging.WARNING)
     arg_parser = argparse.ArgumentParser(prog="app.cli")
@@ -102,10 +130,22 @@ def main() -> None:
         "--trainee-email",
         help="whose trainings these are (not needed when there is a single trainee)",
     )
+    password_parser = subcommands.add_parser("set-password", help="set a user's password")
+    password_parser.add_argument("email")
+    password_parser.add_argument(
+        "--superuser", action="store_true", help="also make the user a superuser"
+    )
     args = arg_parser.parse_args()
 
     if args.command == "import":
         asyncio.run(import_notes(args.replace, args.trainee_email))
+    elif args.command == "set-password":
+        password = getpass.getpass("New password: ")
+        if len(password) < 8:
+            raise SystemExit("The password must be at least 8 characters long")
+        if password != getpass.getpass("Repeat: "):
+            raise SystemExit("The passwords differ")
+        asyncio.run(set_password(args.email, password, args.superuser))
 
 
 if __name__ == "__main__":

backend/app/config.py

@@ -11,6 +11,13 @@ class Settings(BaseSettings):
     version: str = "0.0.1"
     debug: bool = False
 
+    # Auth: JWT_SECRET signs access tokens, it must be long and random (see .env.example)
+    JWT_SECRET: str = ""
+    ACCESS_TOKEN_TTL_MINUTES: int = 15
+    REFRESH_TOKEN_TTL_DAYS: int = 30
+    # The refresh cookie of the web client is sent only over HTTPS when this is on
+    COOKIE_SECURE: bool = False
+
     # Postgres database settings
     POSTGRES_DATABASE_URL: Optional[str] = None
     POSTGRES_DATABASE_HOST: str = "localhost"

backend/app/core/database/repository.py

@@ -1,7 +1,7 @@
 from collections import defaultdict
 from typing import Dict, List, Optional, Sequence
 
-from sqlalchemy import delete, func, insert, select, text, update
+from sqlalchemy import ColumnElement, delete, func, insert, or_, select, text, true, update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.database.tables import approaches, exercises, trainings, users
@@ -12,6 +12,7 @@ from app.core.dto.training import (
     ExerciseSessionDTO,
     TrainingDTO,
 )
+from app.core.dto.user import UserDTO
 
 _trainer = users.alias("trainer")
 # "First Last", the email if the name is empty
@@ -28,6 +29,22 @@ def _trainings_query():
     )
 
 
+def _scope(viewer: Optional[UserDTO], trainee_id: Optional[int]) -> List[ColumnElement]:
+    """Conditions on `trainings`: what the viewer may see, narrowed to one trainee if asked.
+
+    A superuser sees everything, anyone else the trainings where they are the trainee or the
+    trainer. No viewer means no restriction (imports, tests).
+    """
+    conditions: List[ColumnElement] = []
+    if viewer is not None and not viewer.is_superuser:
+        conditions.append(
+            or_(trainings.c.trainee_id == viewer.id, trainings.c.trainer_id == viewer.id)
+        )
+    if trainee_id is not None:
+        conditions.append(trainings.c.trainee_id == trainee_id)
+    return conditions
+
+
 class TrainingRepository:
     """Storage for trainings together with their exercises and approaches (SQLAlchemy Core)."""
 
@@ -60,10 +77,14 @@ class TrainingRepository:
         await self._session.commit()
         return training_ids
 
-    async def get(self, training_id: int) -> Optional[TrainingDTO]:
+    async def get(
+        self, training_id: int, *, viewer: Optional[UserDTO] = None
+    ) -> Optional[TrainingDTO]:
         row = (
             await self._session.execute(
-                _trainings_query().where(trainings.c.id == training_id)
+                _trainings_query().where(
+                    trainings.c.id == training_id, *_scope(viewer, None)
+                )
             )
         ).first()
         if row is None:
@@ -120,19 +141,25 @@ class TrainingRepository:
         await self._session.commit()
         return True
 
-    async def list(self) -> List[TrainingDTO]:
+    async def list(self, *, viewer: Optional[UserDTO] = None) -> List[TrainingDTO]:
         training_rows = (
             await self._session.execute(
-                _trainings_query().order_by(
-                    trainings.c.date.desc(), trainings.c.id.desc()
-                )
+                _trainings_query()
+                .where(*_scope(viewer, None))
+                .order_by(trainings.c.date.desc(), trainings.c.id.desc())
             )
         ).all()
-        approaches_by_exercise = await self._approaches_by_exercise()
-        exercises_by_training: Dict[int, List[ExerciseDTO]] = defaultdict(list)
-        exercise_rows = await self._session.execute(
-            select(exercises).order_by(exercises.c.id)
+        exercise_rows = (
+            await self._session.execute(
+                select(exercises)
+                .where(exercises.c.training_id.in_([row.id for row in training_rows]))
+                .order_by(exercises.c.id)
+            )
+        ).all()
+        approaches_by_exercise = await self._approaches_by_exercise(
+            [row.id for row in exercise_rows]
         )
+        exercises_by_training: Dict[int, List[ExerciseDTO]] = defaultdict(list)
         for row in exercise_rows:
             exercises_by_training[row.training_id].append(
                 ExerciseDTO(
@@ -155,29 +182,41 @@ class TrainingRepository:
             for row in training_rows
         ]
 
-    async def list_exercise_names(self) -> List[ExerciseNameDTO]:
+    async def list_exercise_names(
+        self, *, viewer: Optional[UserDTO] = None, trainee_id: Optional[int] = None
+    ) -> List[ExerciseNameDTO]:
         """Distinct exercise names with the number of times each was done."""
-        query = select(
-            exercises.c.name, func.count(exercises.c.id).label("times")
-        ).group_by(exercises.c.name)
+        query = (
+            select(exercises.c.name, func.count(exercises.c.id).label("times"))
+            .join(trainings, trainings.c.id == exercises.c.training_id)
+            .where(*_scope(viewer, trainee_id))
+            .group_by(exercises.c.name)
+        )
         result = await self._session.execute(query)
         names = [ExerciseNameDTO(name=row.name, count=row.times) for row in result]
         # Sorted here, not in SQL: the order must not depend on DB collation
         return sorted(names, key=lambda item: item.name.casefold())
 
-    async def exercise_history(self, name: str) -> List[ExerciseSessionDTO]:
+    async def exercise_history(
+        self,
+        name: str,
+        *,
+        viewer: Optional[UserDTO] = None,
+        trainee_id: Optional[int] = None,
+    ) -> List[ExerciseSessionDTO]:
         """Every occurrence of the exercise, newest first."""
         query = (
             select(
                 exercises.c.id,
                 exercises.c.splitted_weight,
                 trainings.c.id.label("training_id"),
+                trainings.c.trainee_id,
                 trainings.c.date,
                 _trainer_name,
             )
             .join(trainings, trainings.c.id == exercises.c.training_id)
             .outerjoin(_trainer, _trainer.c.id == trainings.c.trainer_id)
-            .where(exercises.c.name == name)
+            .where(exercises.c.name == name, *_scope(viewer, trainee_id))
             .order_by(trainings.c.date.desc(), exercises.c.id.desc())
         )
         rows = (await self._session.execute(query)).all()
@@ -187,6 +226,7 @@ class TrainingRepository:
         return [
             ExerciseSessionDTO(
                 training_id=row.training_id,
+                trainee_id=row.trainee_id,
                 date=row.date,
                 trainer=row.trainer,
                 splitted_weight=row.splitted_weight,

backend/app/core/database/tables.py

@@ -86,3 +86,16 @@ users = Table(
     Column("created_at", DateTime(timezone=True), nullable=False, server_default=func.now()),
     Column("last_login", DateTime(timezone=True)),
 )
+
+refresh_tokens = Table(
+    "refresh_tokens",
+    metadata,
+    Column("id", Integer, primary_key=True),
+    Column("user_id", ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True),
+    # Tokens issued by rotation from one login share a family: a reused token revokes it all
+    Column("family_id", String(32), nullable=False, index=True),
+    Column("token_hash", String(64), nullable=False, unique=True),
+    Column("expires_at", DateTime(timezone=True), nullable=False),
+    Column("revoked_at", DateTime(timezone=True)),
+    Column("created_at", DateTime(timezone=True), nullable=False, server_default=func.now()),
+)

backend/app/core/database/token_repository.py

@@ -0,0 +1,96 @@
+from dataclasses import dataclass
+from datetime import datetime
+from typing import Optional
+
+from sqlalchemy import func, insert, select, update
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.database.tables import refresh_tokens
+
+
+@dataclass
+class RefreshClaim:
+    user_id: int
+    family_id: str
+
+
+class RefreshTokenRepository:
+    def __init__(self, session: AsyncSession) -> None:
+        self._session = session
+
+    async def create(
+        self, *, user_id: int, family_id: str, token_hash: str, expires_at: datetime
+    ) -> None:
+        await self._session.execute(
+            insert(refresh_tokens).values(
+                user_id=user_id,
+                family_id=family_id,
+                token_hash=token_hash,
+                expires_at=expires_at,
+            )
+        )
+        await self._session.commit()
+
+    async def claim(self, token_hash: str) -> Optional[RefreshClaim]:
+        """Use up a valid refresh token (it can be used only once).
+
+        The check and the revocation are one UPDATE, so of two simultaneous requests with the
+        same token only one wins. A token that was already used up means it leaked (or was
+        replayed): the whole family is revoked and None is returned.
+        """
+        row = (
+            await self._session.execute(
+                update(refresh_tokens)
+                .where(
+                    refresh_tokens.c.token_hash == token_hash,
+                    refresh_tokens.c.revoked_at.is_(None),
+                    refresh_tokens.c.expires_at > func.now(),
+                )
+                .values(revoked_at=func.now())
+                .returning(refresh_tokens.c.user_id, refresh_tokens.c.family_id)
+            )
+        ).first()
+        if row is not None:
+            await self._session.commit()
+            return RefreshClaim(row.user_id, row.family_id)
+
+        used = (
+            await self._session.execute(
+                select(refresh_tokens.c.family_id).where(
+                    refresh_tokens.c.token_hash == token_hash,
+                    refresh_tokens.c.revoked_at.is_not(None),
+                )
+            )
+        ).first()
+        if used is not None:
+            await self._revoke_family(used.family_id)
+        await self._session.commit()
+        return None
+
+    async def revoke_family_of(self, token_hash: str) -> None:
+        """Log out: revoke the token and everything issued from it."""
+        family = (
+            await self._session.execute(
+                select(refresh_tokens.c.family_id).where(
+                    refresh_tokens.c.token_hash == token_hash
+                )
+            )
+        ).first()
+        if family is not None:
+            await self._revoke_family(family.family_id)
+        await self._session.commit()
+
+    async def revoke_all_of_user(self, user_id: int) -> None:
+        await self._session.execute(
+            update(refresh_tokens)
+            .where(refresh_tokens.c.user_id == user_id, refresh_tokens.c.revoked_at.is_(None))
+            .values(revoked_at=func.now())
+        )
+        await self._session.commit()
+
+    async def _revoke_family(self, family_id: str) -> None:
+        await self._session.execute(
+            update(refresh_tokens)
+            .where(refresh_tokens.c.family_id == family_id, refresh_tokens.c.revoked_at.is_(None))
+            .values(revoked_at=func.now())
+        )

backend/app/core/database/user_repository.py

@@ -1,4 +1,4 @@
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, List, Optional, Tuple
 
 from sqlalchemy import delete, insert, select, update
 from sqlalchemy.exc import IntegrityError
@@ -54,6 +54,13 @@ class UserRepository:
         ).first()
         return UserDTO.model_validate(row) if row else None
 
+    async def get_credentials(self, email: str) -> Optional[Tuple[UserDTO, str]]:
+        """The user and the hash of the password, for logging in."""
+        row = (
+            await self._session.execute(select(users).where(users.c.email == email))
+        ).first()
+        return (UserDTO.model_validate(row), row.password_hash) if row else None
+
     async def list(self, role: Optional[UserRole] = None) -> List[UserDTO]:
         query = select(users).order_by(users.c.id)
         if role is not None:

backend/app/core/dto/training.py

@@ -42,6 +42,7 @@ class ExerciseSessionDTO(DTOBase):
     """One occurrence of an exercise in the history of that exercise."""
 
     training_id: int | None = None
+    trainee_id: int | None = None
     date: date
     trainer: str | None = None
     splitted_weight: bool = False

backend/app/core/dto/user.py

@@ -23,3 +23,10 @@ class UserDTO(BaseModel):
     is_superuser: bool
     created_at: datetime
     last_login: datetime | None = None
+
+
+class TrainerDTO(BaseModel):
+    """What any signed-in user may know about a trainer: enough to pick one in a form."""
+
+    id: int
+    name: str

backend/app/core/security.py

@@ -1,16 +1,26 @@
-"""Password hashing with scrypt from the standard library (no extra dependencies).
+"""Passwords and tokens.
 
-Stored format: scrypt$<n>$<r>$<p>$<salt, base64>$<hash, base64>. The parameters are stored with
-the hash, so they can be raised later without invalidating existing passwords.
+Passwords are hashed with scrypt from the standard library. Stored format:
+scrypt$<n>$<r>$<p>$<salt, base64>$<hash, base64>. The parameters are stored with the hash, so
+they can be raised later without invalidating existing passwords.
+
+Access tokens are short-lived JWTs (HS256). Refresh tokens are opaque random strings, only their
+hash is stored in the database.
 """
 
 import base64
 import hashlib
 import hmac
 import secrets
+from datetime import datetime, timedelta, timezone
+
+import jwt
+
+from app.config import settings
 
 _N, _R, _P = 2**14, 8, 1
 _KEY_LENGTH = 32
+JWT_ALGORITHM = "HS256"
 
 
 def _derive(password: str, salt: bytes, n: int, r: int, p: int) -> bytes:
@@ -37,3 +47,37 @@ def verify_password(password: str, stored: str) -> bool:
     except ValueError:
         return False
     return hmac.compare_digest(actual, expected)
+
+
+# Verified when the email is unknown, so that a login takes the same time either way
+DUMMY_PASSWORD_HASH = hash_password(secrets.token_urlsafe(16))
+
+
+def create_access_token(user_id: int, role: str) -> str:
+    now = datetime.now(timezone.utc)
+    payload = {
+        "sub": str(user_id),
+        "role": role,
+        "iat": now,
+        "exp": now + timedelta(minutes=settings.ACCESS_TOKEN_TTL_MINUTES),
+    }
+    return jwt.encode(payload, settings.JWT_SECRET, algorithm=JWT_ALGORITHM)
+
+
+def decode_access_token(token: str) -> dict:
+    """Payload of a valid access token, jwt.PyJWTError otherwise (bad signature, expired...)."""
+    return jwt.decode(
+        token,
+        settings.JWT_SECRET,
+        algorithms=[JWT_ALGORITHM],
+        options={"require": ["sub", "exp"]},
+    )
+
+
+def new_refresh_token() -> str:
+    return secrets.token_urlsafe(48)
+
+
+def hash_token(token: str) -> str:
+    # The token is random with 384 bits of entropy: a plain fast hash is enough
+    return hashlib.sha256(token.encode()).hexdigest()

backend/app/main.py

@@ -15,6 +15,8 @@ logging.basicConfig(
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
+    if len(settings.JWT_SECRET) < 32:
+        raise RuntimeError("JWT_SECRET must be set to a random string of 32+ characters")
     # Schema is managed by Alembic: run `alembic upgrade head` before starting the app
     engine = create_engine(settings.get_postgres_database_url())
     app.state.session_factory = create_session_factory(engine)

backend/app/schemas/auth.py

@@ -0,0 +1,24 @@
+from typing import Literal, Optional
+
+from pydantic import BaseModel
+
+
+class LoginRequest(BaseModel):
+    email: str
+    password: str
+    # "web": the refresh token goes only into an httpOnly cookie, script code never sees it.
+    # "native" (iOS...): it is returned in the body, the app keeps it in the Keychain.
+    client: Literal["web", "native"] = "native"
+
+
+class RefreshRequest(BaseModel):
+    """Native clients send the refresh token in the body, the web client in the cookie."""
+
+    refresh_token: Optional[str] = None
+
+
+class TokenResponse(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+    expires_in: int  # seconds
+    refresh_token: Optional[str] = None  # None for the web client: it is in the cookie

backend/app/schemas/exercises.py

@@ -16,6 +16,7 @@ class SessionMetricsResponse(BaseModel):
 
 class SessionRowResponse(BaseModel):
     training_id: Optional[int]
+    trainee_id: Optional[int]
     date: date
     trainer: Optional[str]
     splitted_weight: bool

backend/migrations/versions/2026_10_23_1800-57f1f0337033_add_refresh_tokens.py

@@ -0,0 +1,51 @@
+"""add refresh tokens
+
+Also makes the owner a superuser (the first one, who creates the others).
+
+Revision ID: 57f1f0337033
+Revises: b1c2d3e4f5a6
+Create Date: 2026-10-23 18:00:02.101967
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '57f1f0337033'
+down_revision: Union[str, Sequence[str], None] = 'b1c2d3e4f5a6'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('refresh_tokens',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('user_id', sa.Integer(), nullable=False),
+    sa.Column('family_id', sa.String(length=32), nullable=False),
+    sa.Column('token_hash', sa.String(length=64), nullable=False),
+    sa.Column('expires_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('revoked_at', sa.DateTime(timezone=True), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('token_hash')
+    )
+    op.create_index(op.f('ix_refresh_tokens_family_id'), 'refresh_tokens', ['family_id'], unique=False)
+    op.create_index(op.f('ix_refresh_tokens_user_id'), 'refresh_tokens', ['user_id'], unique=False)
+    # ### end Alembic commands ###
+    # Somebody has to be able to create users: the owner of the data is the first superuser
+    op.execute("UPDATE users SET is_superuser = true WHERE email = 'pro100ton@gmail.com'")
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_refresh_tokens_user_id'), table_name='refresh_tokens')
+    op.drop_index(op.f('ix_refresh_tokens_family_id'), table_name='refresh_tokens')
+    op.drop_table('refresh_tokens')
+    # ### end Alembic commands ###

backend/requirements-dev.txt

@@ -5,3 +5,4 @@ pytest-asyncio==1.4.0
 mypy==1.17.1
 types-grpcio==1.0.0.20250703
 types-protobuf==6.30.2.20250822
+httpx==0.28.1

backend/requirements.txt

@@ -6,3 +6,4 @@ python-dotenv==1.1.1
 sqlalchemy[asyncio]==2.1.6
 asyncpg==0.32.0
 alembic==1.20.1
+PyJWT==2.10.1

backend/tests/conftest.py

@@ -86,3 +86,20 @@ async def trainer(session):
         last_name="Степан",
         role=UserRole.trainer,
     )
+
+
+@pytest.fixture
+async def client(session, monkeypatch):
+    """HTTP client of the app on the test database (needs the `session` fixture's clean DB)."""
+    from httpx import ASGITransport, AsyncClient
+
+    from app.main import app
+
+    monkeypatch.setattr(settings, "JWT_SECRET", "test-secret-" + "x" * 40)
+    engine = create_engine(TEST_DATABASE_URL)
+    app.state.session_factory = create_session_factory(engine)
+    async with AsyncClient(
+        transport=ASGITransport(app=app), base_url="http://test"
+    ) as http_client:
+        yield http_client
+    await engine.dispose()

backend/tests/test_api/test_auth.py

@@ -0,0 +1,289 @@
+"""Login, token rotation and who may do what, through the real HTTP API."""
+
+from datetime import date
+
+import pytest
+
+from app.config import settings
+from app.core.database.repository import TrainingRepository
+from app.core.database.user_repository import UserRepository
+from app.core.dto.training import ApproachDTO, ExerciseDTO, TrainingDTO
+from app.core.dto.user import UserRole
+from app.core.security import hash_password
+
+PASSWORD = "correct horse"
+
+
+async def make_user(session, email, role=UserRole.trainee, superuser=False, **fields):
+    repository = UserRepository(session)
+    user = await repository.create(
+        email=email, password_hash=hash_password(PASSWORD), role=role, **fields
+    )
+    if superuser:
+        user = await repository.update(user.id, {"is_superuser": True})
+    return user
+
+
+async def make_training(session, trainee, trainer=None, exercise="Жим", weight=50):
+    return await TrainingRepository(session).save(
+        TrainingDTO(
+            date=date(2025, 1, 1),
+            trainee_id=trainee.id,
+            trainer_id=trainer.id if trainer else None,
+            exercises=[
+                ExerciseDTO(name=exercise, approaches=[ApproachDTO(weight=weight, reps=10)])
+            ],
+        )
+    )
+
+
+async def login(http, email, **extra):
+    return await http.post(
+        "/api/v1/auth/login/", json={"email": email, "password": PASSWORD, **extra}
+    )
+
+
+async def auth_headers(client, email):
+    token = (await login(client, email)).json()["access_token"]
+    return {"Authorization": f"Bearer {token}"}
+
+
+# --- login and tokens ---------------------------------------------------------------------
+
+
+async def test_login_returns_working_tokens(client, session):
+    await make_user(session, "a@example.com", first_name="Anna")
+
+    response = await login(client, " A@Example.com ")
+
+    assert response.status_code == 200
+    body = response.json()
+    assert body["token_type"] == "bearer" and body["expires_in"] == 15 * 60
+    assert body["refresh_token"]
+    me = await client.get(
+        "/api/v1/auth/me/", headers={"Authorization": f"Bearer {body['access_token']}"}
+    )
+    assert me.json()["email"] == "a@example.com" and "password" not in me.text
+    assert (await UserRepository(session).list())[0].last_login is not None
+
+
+async def test_wrong_password_unknown_email_and_inactive_user_are_rejected(client, session):
+    user = await make_user(session, "a@example.com")
+
+    wrong = await client.post(
+        "/api/v1/auth/login/", json={"email": "a@example.com", "password": "nope"}
+    )
+    unknown = await login(client, "nobody@example.com")
+    assert wrong.status_code == unknown.status_code == 401
+    assert wrong.json() == unknown.json()  # nothing tells which of the two was wrong
+
+    await UserRepository(session).update(user.id, {"is_active": False})
+    assert (await login(client, "a@example.com")).status_code == 401
+
+
+async def test_web_client_gets_the_refresh_token_only_in_an_httponly_cookie(client, session):
+    await make_user(session, "a@example.com")
+
+    response = await login(client, "a@example.com", client="web")
+
+    assert response.json()["refresh_token"] is None
+    cookie = response.headers["set-cookie"].lower()
+    assert "refresh_token=" in cookie and "httponly" in cookie and "samesite=strict" in cookie
+    assert "path=/api/v1/auth" in cookie
+
+    refreshed = await client.post("/api/v1/auth/refresh/")  # the cookie jar sends it
+    assert refreshed.status_code == 200
+    assert refreshed.json()["refresh_token"] is None
+    assert refreshed.headers["set-cookie"] != response.headers["set-cookie"]  # rotated
+
+
+async def test_refresh_token_works_once_and_reuse_revokes_the_whole_chain(client, session):
+    await make_user(session, "a@example.com")
+    first = (await login(client, "a@example.com")).json()["refresh_token"]
+
+    second = await client.post("/api/v1/auth/refresh/", json={"refresh_token": first})
+    assert second.status_code == 200
+    newest = second.json()["refresh_token"]
+    assert newest != first
+
+    # The old token again: somebody has a copy. Everything issued from it dies.
+    replay = await client.post("/api/v1/auth/refresh/", json={"refresh_token": first})
+    assert replay.status_code == 401
+    after = await client.post("/api/v1/auth/refresh/", json={"refresh_token": newest})
+    assert after.status_code == 401
+
+
+async def test_logout_revokes_the_refresh_token(client, session):
+    await make_user(session, "a@example.com")
+    refresh_token = (await login(client, "a@example.com")).json()["refresh_token"]
+
+    await client.post("/api/v1/auth/logout/", json={"refresh_token": refresh_token})
+
+    response = await client.post("/api/v1/auth/refresh/", json={"refresh_token": refresh_token})
+    assert response.status_code == 401
+
+
+async def test_refresh_fails_for_a_deactivated_user(client, session):
+    user = await make_user(session, "a@example.com")
+    refresh_token = (await login(client, "a@example.com")).json()["refresh_token"]
+    await UserRepository(session).update(user.id, {"is_active": False})
+
+    response = await client.post("/api/v1/auth/refresh/", json={"refresh_token": refresh_token})
+    assert response.status_code == 401
+
+
+async def test_missing_bad_and_expired_access_tokens_are_401(client, session, monkeypatch):
+    await make_user(session, "a@example.com")
+    headers = await auth_headers(client, "a@example.com")
+
+    assert (await client.get("/api/v1/trainings/")).status_code == 401
+    bad = {"Authorization": headers["Authorization"][:-3] + "abc"}
+    assert (await client.get("/api/v1/trainings/", headers=bad)).status_code == 401
+    assert (await client.get("/api/v1/trainings/", headers=headers)).status_code == 200
+
+    monkeypatch.setattr(settings, "ACCESS_TOKEN_TTL_MINUTES", -1)
+    expired = await auth_headers(client, "a@example.com")
+    assert (await client.get("/api/v1/trainings/", headers=expired)).status_code == 401
+
+
+async def test_deactivated_user_loses_access_before_the_token_expires(client, session):
+    user = await make_user(session, "a@example.com")
+    headers = await auth_headers(client, "a@example.com")
+
+    await UserRepository(session).update(user.id, {"is_active": False})
+
+    assert (await client.get("/api/v1/trainings/", headers=headers)).status_code == 401
+
+
+async def test_health_is_open(client):
+    assert (await client.get("/api/v1/health/")).status_code == 200
+
+
+# --- who may do what ----------------------------------------------------------------------
+
+
+async def test_everyone_sees_only_their_trainings(client, session):
+    anna = await make_user(session, "anna@example.com")
+    boris = await make_user(session, "boris@example.com")
+    coach = await make_user(session, "coach@example.com", UserRole.trainer, first_name="Пан")
+    other_coach = await make_user(session, "coach2@example.com", UserRole.trainer)
+    admin = await make_user(session, "admin@example.com", superuser=True)
+    annas = await make_training(session, anna, trainer=coach)
+    boriss = await make_training(session, boris, trainer=other_coach)
+
+    async def visible(email):
+        response = await client.get(
+            "/api/v1/trainings/", headers=await auth_headers(client, email)
+        )
+        return {item["id"] for item in response.json()}
+
+    assert await visible("anna@example.com") == {annas}
+    assert await visible("boris@example.com") == {boriss}
+    assert await visible("coach@example.com") == {annas}
+    assert await visible("admin@example.com") == {annas, boriss}
+
+    # a training of someone else doesn't exist for the user
+    headers = await auth_headers(client, "anna@example.com")
+    assert (await client.get(f"/api/v1/trainings/{boriss}/", headers=headers)).status_code == 404
+    assert (await client.get(f"/api/v1/trainings/{annas}/", headers=headers)).status_code == 200
+
+
+def update_body(trainee_id, trainer_id=None):
+    return {
+        "date": "2025-02-02",
+        "trainee_id": trainee_id,
+        "trainer_id": trainer_id,
+        "exercises": [{"name": "Тяга", "approaches": [{"weight": 30, "reps": 8}]}],
+    }
+
+
+async def test_only_the_trainee_or_a_superuser_can_change_a_training(client, session):
+    anna = await make_user(session, "anna@example.com")
+    boris = await make_user(session, "boris@example.com")
+    coach = await make_user(session, "coach@example.com", UserRole.trainer)
+    await make_user(session, "admin@example.com", superuser=True)
+    training_id = await make_training(session, anna, trainer=coach)
+    url = f"/api/v1/trainings/{training_id}/"
+
+    coach_headers = await auth_headers(client, "coach@example.com")
+    boris_headers = await auth_headers(client, "boris@example.com")
+    anna_headers = await auth_headers(client, "anna@example.com")
+
+    assert (await client.put(url, json=update_body(anna.id, coach.id), headers=coach_headers)).status_code == 403
+    assert (await client.delete(url, headers=coach_headers)).status_code == 403
+    assert (await client.put(url, json=update_body(anna.id), headers=boris_headers)).status_code == 404
+    assert (await client.delete(url, headers=boris_headers)).status_code == 404
+
+    # the trainee can't hand the training over to somebody else, the superuser can
+    assert (await client.put(url, json=update_body(boris.id), headers=anna_headers)).status_code == 403
+    ok = await client.put(url, json=update_body(anna.id), headers=anna_headers)
+    assert ok.status_code == 200 and ok.json()["trainer"] is None
+    admin_headers = await auth_headers(client, "admin@example.com")
+    moved = await client.put(url, json=update_body(boris.id), headers=admin_headers)
+    assert moved.status_code == 200 and moved.json()["trainee_id"] == boris.id
+
+    assert (await client.delete(url, headers=admin_headers)).status_code == 200
+
+
+async def test_user_management_is_for_superusers_only(client, session):
+    await make_user(session, "anna@example.com")
+    admin = await make_user(session, "admin@example.com", superuser=True)
+    anna_headers = await auth_headers(client, "anna@example.com")
+    admin_headers = await auth_headers(client, "admin@example.com")
+    new_user = {"email": "new@example.com", "password": "12345678"}
+
+    assert (await client.get("/api/v1/users/", headers=anna_headers)).status_code == 403
+    assert (await client.post("/api/v1/users/", json=new_user, headers=anna_headers)).status_code == 403
+    assert (await client.post("/api/v1/users/", json=new_user)).status_code == 401
+    assert (await client.post("/api/v1/users/", json=new_user, headers=admin_headers)).status_code == 201
+
+    # the new user can log in with the password the superuser chose
+    created = await client.post(
+        "/api/v1/auth/login/", json={"email": "new@example.com", "password": "12345678"}
+    )
+    assert created.status_code == 200
+    # a superuser can't lock themselves out
+    assert (await client.delete(f"/api/v1/users/{admin.id}/", headers=admin_headers)).status_code == 400
+
+
+async def test_any_user_can_list_trainers_but_only_by_name(client, session):
+    await make_user(session, "anna@example.com")
+    await make_user(session, "coach@example.com", UserRole.trainer, first_name="Пан", last_name="Степан")
+
+    response = await client.get(
+        "/api/v1/users/trainers/", headers=await auth_headers(client, "anna@example.com")
+    )
+
+    assert response.status_code == 200
+    assert [(t["name"], set(t)) for t in response.json()] == [("Пан Степан", {"id", "name"})]
+
+
+async def test_exercise_statistics_are_about_the_users_own_trainings(client, session):
+    anna = await make_user(session, "anna@example.com")
+    boris = await make_user(session, "boris@example.com")
+    await make_training(session, anna, exercise="Жим", weight=50)
+    await make_training(session, boris, exercise="Жим", weight=90)
+    await make_training(session, boris, exercise="Тяга")
+    headers = await auth_headers(client, "anna@example.com")
+
+    names = await client.get("/api/v1/exercises/", headers=headers)
+    progress = await client.get("/api/v1/exercises/progress/", params={"name": "Жим"}, headers=headers)
+    foreign = await client.get("/api/v1/exercises/progress/", params={"name": "Тяга"}, headers=headers)
+    other_trainee = await client.get(
+        "/api/v1/exercises/progress/", params={"name": "Жим", "trainee_id": boris.id}, headers=headers
+    )
+
+    assert [n["name"] for n in names.json()] == ["Жим"]
+    assert progress.json()["max_weight"] == 50 and len(progress.json()["rows"]) == 1
+    assert foreign.status_code == 404
+    assert other_trainee.status_code == 404  # Boris' trainings are not visible to Anna
+
+
+async def test_parser_and_dev_endpoints_need_a_login(client, session):
+    await make_user(session, "anna@example.com")
+    headers = await auth_headers(client, "anna@example.com")
+    body = {"data": "# 07.01.2025 (solo-2)\n", "format": "obsidian"}
+
+    assert (await client.post("/api/v1/parser/parse/", json=body)).status_code == 401
+    assert (await client.post("/api/v1/parser/parse/", json=body, headers=headers)).status_code == 200
+    assert (await client.get("/api/v1/trainings/obsidian/", headers=headers)).status_code == 403

compose.yaml

@@ -33,6 +33,7 @@ services:
       - ./frontend/exercises.html:/usr/share/nginx/html/exercises.html:ro
       - ./frontend/parse.html:/usr/share/nginx/html/parse.html:ro
       - ./frontend/users.html:/usr/share/nginx/html/users.html:ro
+      - ./frontend/login.html:/usr/share/nginx/html/login.html:ro
       - ./frontend/css:/usr/share/nginx/html/css:ro
       - ./frontend/js:/usr/share/nginx/html/js:ro
       - ./frontend/vendor:/usr/share/nginx/html/vendor:ro

frontend/Dockerfile

@@ -1,7 +1,7 @@
 FROM nginx:1.27-alpine
 
 COPY nginx.conf /etc/nginx/conf.d/default.conf
-COPY index.html exercises.html parse.html users.html /usr/share/nginx/html/
+COPY index.html exercises.html parse.html users.html login.html /usr/share/nginx/html/
 COPY css /usr/share/nginx/html/css
 COPY js /usr/share/nginx/html/js
 COPY vendor /usr/share/nginx/html/vendor

frontend/exercises.html

@@ -18,8 +18,9 @@
                 <li class="nav-item"><a class="nav-link text-white" href="index.html">Тренировки</a></li>
                 <li class="nav-item"><a class="nav-link text-white" href="parse.html">Разобрать заметку</a></li>
                 <li class="nav-item"><a class="nav-link text-white active" href="exercises.html">Упражнения</a></li>
-                <li class="nav-item"><a class="nav-link text-white" href="users.html">Пользователи</a></li>
+                <li class="nav-item" data-superuser-only hidden><a class="nav-link text-white" href="users.html">Пользователи</a></li>
             </ul>
+            <div id="user-box" class="mt-4 small text-white-50"></div>
         </aside>
 
         <main class="flex-grow-1 p-4 content" id="content">

frontend/index.html

@@ -18,8 +18,9 @@
                 <li class="nav-item"><a class="nav-link text-white active" href="index.html">Тренировки</a></li>
                 <li class="nav-item"><a class="nav-link text-white" href="parse.html">Разобрать заметку</a></li>
                 <li class="nav-item"><a class="nav-link text-white" href="exercises.html">Упражнения</a></li>
-                <li class="nav-item"><a class="nav-link text-white" href="users.html">Пользователи</a></li>
+                <li class="nav-item" data-superuser-only hidden><a class="nav-link text-white" href="users.html">Пользователи</a></li>
             </ul>
+            <div id="user-box" class="mt-4 small text-white-50"></div>
         </aside>
 
         <main class="flex-grow-1 p-4 content" id="content">

frontend/js/auth.js

@@ -0,0 +1,101 @@
+// Session: the short-lived access token lives in sessionStorage; the refresh token is an
+// httpOnly cookie that the browser sends to /auth/* by itself (script code can't read it).
+
+const API = '/api/v1';
+const STORAGE_KEY = 'access';
+// Refresh a bit before the expiry so that a request doesn't go out with a dying token
+const MARGIN_MS = 30_000;
+
+function stored() {
+    try {
+        return JSON.parse(sessionStorage.getItem(STORAGE_KEY));
+    } catch {
+        return null;
+    }
+}
+
+function store(tokens) {
+    const access = { token: tokens.access_token, expiresAt: Date.now() + tokens.expires_in * 1000 };
+    try {
+        sessionStorage.setItem(STORAGE_KEY, JSON.stringify(access));
+    } catch {
+        // sessionStorage is unavailable: the token is then only valid for this call chain
+    }
+    return access;
+}
+
+export function clearSession() {
+    try {
+        sessionStorage.removeItem(STORAGE_KEY);
+    } catch {
+        // nothing to clear
+    }
+}
+
+async function post(path, body) {
+    return fetch(API + path, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: body === undefined ? undefined : JSON.stringify(body),
+    });
+}
+
+/** Signs in; throws an Error with `status` (401: wrong email or password). */
+export async function login(email, password) {
+    const response = await post('/auth/login/', { email, password, client: 'web' });
+    if (!response.ok) {
+        const error = new Error(`HTTP ${response.status}`);
+        error.status = response.status;
+        throw error;
+    }
+    store(await response.json());
+}
+
+// One refresh at a time: the refresh token works once, two parallel requests would
+// make the second one look like a stolen token
+let refreshing = null;
+
+/** Exchanges the cookie for a new access token. false: the session is over, sign in again. */
+export function refresh() {
+    refreshing ??= (async () => {
+        try {
+            const response = await post('/auth/refresh/');
+            if (!response.ok) {
+                clearSession();
+                return false;
+            }
+            store(await response.json());
+            return true;
+        } finally {
+            refreshing = null;
+        }
+    })();
+    return refreshing;
+}
+
+/** A valid access token, refreshed when needed; null when there is no session. */
+export async function accessToken() {
+    let access = stored();
+    if (!access || access.expiresAt - Date.now() < MARGIN_MS) {
+        if (!(await refresh())) {
+            return null;
+        }
+        access = stored();
+    }
+    return access?.token ?? null;
+}
+
+export async function logout() {
+    try {
+        await post('/auth/logout/');
+    } finally {
+        clearSession();
+    }
+}
+
+/** Never settles: stops the page code that follows while the browser goes to the login page */
+export function redirectToLogin() {
+    const next = location.pathname + location.search;
+    location.href = `login.html?next=${encodeURIComponent(next)}`;
+    return new Promise(() => {});
+}

frontend/js/common.js

@@ -1,12 +1,31 @@
 // Shared helpers: API access, DOM building, formatting
 
+import { accessToken, redirectToLogin, refresh } from './auth.js';
+
 const API = '/api/v1';
 
 /** What a training without a trainer is called */
 export const SOLO = 'соло';
 
-export async function api(path, options) {
-    const response = await fetch(API + path, options);
+async function send(path, options, token) {
+    const headers = { ...options.headers, Authorization: `Bearer ${token}` };
+    return fetch(API + path, { ...options, headers });
+}
+
+/** JSON request to the API with the access token. Without a session the browser is sent to
+ *  the login page; an expired token is refreshed and the request repeated once. */
+export async function api(path, options = {}) {
+    const token = await accessToken();
+    if (!token) {
+        return redirectToLogin();
+    }
+    let response = await send(path, options, token);
+    if (response.status === 401) {
+        if (!(await refresh())) {
+            return redirectToLogin();
+        }
+        response = await send(path, options, await accessToken());
+    }
     if (!response.ok) {
         const error = new Error(`HTTP ${response.status}`);
         error.status = response.status;
@@ -37,9 +56,10 @@ export function formatDate(iso) {
     return `${day}.${month}.${year}`;
 }
 
-/** "First Last" of a user, the email when the name is empty */
+/** "First Last" of a user, the email when the name is empty. Trainers in a list come with
+ *  a ready `name`. */
 export function userName(user) {
-    return `${user.first_name} ${user.last_name}`.trim() || user.email;
+    return user.name || `${user.first_name} ${user.last_name}`.trim() || user.email;
 }
 
 /** "2026-10-23T17:27:00+00:00" -> "23.10.2026 17:27" in the viewer's timezone */

frontend/js/edit-dialog.js

@@ -3,6 +3,7 @@
 import { alert, api, h } from './common.js';
 import { editForm } from './edit-form.js';
 import { openModal } from './modal.js';
+import { user } from './page.js';
 
 /** "Изменить" button: opens the modal, the page reloads after a save to show fresh data */
 export function editButton(trainingId) {
@@ -18,8 +19,9 @@ export async function openEditDialog(trainingId, onChange) {
         const [training, exerciseNames, trainees, trainers] = await Promise.all([
             api(`/trainings/${trainingId}/`),
             api('/exercises/'),
-            api('/users/?role=trainee'),
-            api('/users/?role=trainer'),
+            // only a superuser may hand a training to another trainee
+            user.is_superuser ? api('/users/?role=trainee') : null,
+            api('/users/trainers/'),
         ]);
         body.replaceChildren(editForm(training, exerciseNames, { trainees, trainers }, {
             onDone: () => { hide(); onChange(); },

frontend/js/edit-form.js

@@ -79,7 +79,7 @@ function userSelect(name, users, selectedId, emptyTitle) {
 }
 
 /**
- * trainees / trainers: users to choose from. onDone() is called after the training was saved
+ * trainees / trainers: users to choose from (trainees is null when the trainee can't be changed). onDone() is called after the training was saved
  * or deleted, onCancel() on "Отмена".
  */
 export function editForm(training, exerciseNames, { trainees, trainers }, { onDone, onCancel }) {
@@ -101,7 +101,9 @@ export function editForm(training, exerciseNames, { trainees, trainers }, { onDo
         h('datalist', { id: 'edit-exercise-names' }, ...exerciseNames.map((item) => h('option', { value: item.name }))),
         h('div', { class: 'row g-3 mb-3' },
             field('Дата', h('input', { type: 'date', class: 'form-control', name: 'date', required: true, value: training.date }), 'col-12 col-md-3'),
-            field('Тренирующийся', userSelect('trainee_id', trainees, training.trainee_id), 'col-12 col-md-3'),
+            trainees
+                ? field('Тренирующийся', userSelect('trainee_id', trainees, training.trainee_id), 'col-12 col-md-3')
+                : h('input', { type: 'hidden', name: 'trainee_id', value: training.trainee_id }),
             field('Тренер', userSelect('trainer_id', trainers, training.trainer_id, `${SOLO} (без тренера)`), 'col-12 col-md-3')),
         exercisesBox,
         addExercise,

frontend/js/exercises.js

@@ -1,5 +1,7 @@
+import './page.js';
 import { alert, api, approachChips, formatDate, h, num, perArmBadge, signed, SOLO, tip } from './common.js';
 import { editButton } from './edit-dialog.js';
+import { canEditTraining } from './page.js';
 import { createTable } from './table.js';
 
 const HINTS = {
@@ -116,7 +118,7 @@ function progressView(progress) {
             { title: 'Лучший подход', className: 'text-nowrap text-end', sort: (row) => row.metrics.best_reps, cell: (row) => `${row.metrics.best_reps}` },
             { title: 'Всего повторов', className: 'text-nowrap text-end', sort: (row) => row.metrics.total_reps, cell: (row) => `${row.metrics.total_reps}` },
         ]),
-        { title: '', cell: (row) => row.training_id ? editButton(row.training_id) : null },
+        { title: '', cell: (row) => row.training_id && canEditTraining(row.trainee_id) ? editButton(row.training_id) : null },
     ];
 
     return [

frontend/js/login.js

@@ -0,0 +1,26 @@
+import { login } from './auth.js';
+import { alert, h } from './common.js';
+
+const form = document.getElementById('login-form');
+const status = document.getElementById('status');
+
+/** Where to go after signing in: the page that sent us here, but only a path of this site */
+function nextPage() {
+    const next = new URLSearchParams(location.search).get('next');
+    return next && next.startsWith('/') && !next.startsWith('//') ? next : 'index.html';
+}
+
+form.addEventListener('submit', async (event) => {
+    event.preventDefault();
+    const submit = form.querySelector('button');
+    submit.disabled = true;
+    try {
+        await login(form.elements.email.value, form.elements.password.value);
+        location.href = nextPage();
+    } catch (error) {
+        status.replaceChildren(h('div', { class: 'mb-3' }, alert('danger', error.status === 401
+            ? 'Неверный email или пароль.'
+            : `Не удалось войти: ${error.message}`)));
+        submit.disabled = false;
+    }
+});

frontend/js/page.js

@@ -0,0 +1,28 @@
+// Every page imports this first: it requires a signed-in user and fills the sidebar.
+// `user` is the current user (the module waits for it, so importers can use it at once).
+
+import { logout, redirectToLogin } from './auth.js';
+import { api, h, userName } from './common.js';
+
+const ROLES = { trainer: 'Тренер', trainee: 'Тренирующийся' };
+
+export const user = await api('/auth/me/');
+
+/** A training can be changed by its trainee (a trainer only sees it) and by a superuser */
+export function canEditTraining(traineeId) {
+    return user.is_superuser || user.id === traineeId;
+}
+
+for (const element of document.querySelectorAll('[data-superuser-only]')) {
+    element.hidden = !user.is_superuser;
+}
+
+const signOut = h('button', { type: 'button', class: 'btn btn-sm btn-outline-light mt-2' }, 'Выйти');
+signOut.addEventListener('click', async () => {
+    await logout();
+    await redirectToLogin();
+});
+document.getElementById('user-box')?.replaceChildren(
+    h('div', { class: 'text-white text-truncate' }, userName(user)),
+    h('div', {}, ROLES[user.role] + (user.is_superuser ? ', администратор' : '')),
+    signOut);

frontend/js/parse.js

@@ -1,4 +1,5 @@
 import { alert, api } from './common.js';
+import './page.js';
 import { trainingsView } from './trainings-view.js';
 
 const form = document.getElementById('parse-form');

frontend/js/trainings-view.js

@@ -2,6 +2,7 @@
 
 import { alert, approachChips, formatDate, h, perArmBadge, SOLO } from './common.js';
 import { editButton } from './edit-dialog.js';
+import { canEditTraining } from './page.js';
 import { createTable } from './table.js';
 
 export function trainingsView(trainings) {
@@ -39,7 +40,7 @@ export function trainingsView(trainings) {
                 { title: 'Подходы (вес × повторения)', cell: (row) => h('span', {}, ...(row.exercise ? approachChips(row.exercise.approaches) : [])) },
                 ...(editable ? [{
                     title: '',
-                    cell: (row) => editButton(row.training.id),
+                    cell: (row) => canEditTraining(row.training.trainee_id) ? editButton(row.training.id) : null,
                 }] : []),
             ],
         }));

frontend/js/trainings.js

@@ -1,4 +1,5 @@
 import { alert, api } from './common.js';
+import './page.js';
 import { trainingsView } from './trainings-view.js';
 
 const container = document.getElementById('trainings');

frontend/js/users.js

@@ -1,4 +1,5 @@
 import { alert, api, formatDateTime, h } from './common.js';
+import { user } from './page.js';
 import { createTable } from './table.js';
 import { openUserDialog } from './user-dialog.js';
 
@@ -7,6 +8,10 @@ const ROLES = {
     trainee: { title: 'Тренирующийся', badge: 'text-bg-secondary' },
 };
 
+if (!user.is_superuser) {
+    location.href = 'index.html';
+}
+
 const container = document.getElementById('users');
 const reload = () => location.reload();
 

frontend/login.html

@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>Вход - Fitness Parser</title>
+
+    <link href="vendor/bootstrap.min.css" rel="stylesheet">
+    <link href="css/main.css" rel="stylesheet">
+</head>
+<body class="bg-light">
+    <main class="container" style="max-width: 24rem; padding-top: 15vh;">
+        <h1 class="h3 mb-4 text-center">Fitness parser</h1>
+        <form id="login-form" class="card card-body">
+            <div class="mb-3">
+                <label class="form-label small text-muted mb-1" for="email">Email</label>
+                <input class="form-control" id="email" name="email" type="email" required autofocus autocomplete="username">
+            </div>
+            <div class="mb-3">
+                <label class="form-label small text-muted mb-1" for="password">Пароль</label>
+                <input class="form-control" id="password" name="password" type="password" required autocomplete="current-password">
+            </div>
+            <div id="status"></div>
+            <button class="btn btn-primary w-100" type="submit">Войти</button>
+        </form>
+    </main>
+
+    <script type="module" src="js/login.js"></script>
+</body>
+</html>

frontend/parse.html

@@ -18,8 +18,9 @@
                 <li class="nav-item"><a class="nav-link text-white" href="index.html">Тренировки</a></li>
                 <li class="nav-item"><a class="nav-link text-white active" href="parse.html">Разобрать заметку</a></li>
                 <li class="nav-item"><a class="nav-link text-white" href="exercises.html">Упражнения</a></li>
-                <li class="nav-item"><a class="nav-link text-white" href="users.html">Пользователи</a></li>
+                <li class="nav-item" data-superuser-only hidden><a class="nav-link text-white" href="users.html">Пользователи</a></li>
             </ul>
+            <div id="user-box" class="mt-4 small text-white-50"></div>
         </aside>
 
         <main class="flex-grow-1 p-4 content" id="content">

frontend/users.html

@@ -18,8 +18,9 @@
                 <li class="nav-item"><a class="nav-link text-white" href="index.html">Тренировки</a></li>
                 <li class="nav-item"><a class="nav-link text-white" href="parse.html">Разобрать заметку</a></li>
                 <li class="nav-item"><a class="nav-link text-white" href="exercises.html">Упражнения</a></li>
-                <li class="nav-item"><a class="nav-link text-white active" href="users.html">Пользователи</a></li>
+                <li class="nav-item" data-superuser-only hidden><a class="nav-link text-white active" href="users.html">Пользователи</a></li>
             </ul>
+            <div id="user-box" class="mt-4 small text-white-50"></div>
         </aside>
 
         <main class="flex-grow-1 p-4 content" id="content">