multi-user auth (CLI-created accounts), per-user history, test suite

- server/users.py replaces credentials.py: users.json (0600), PBKDF2,
  one-time migration of the legacy single password to user admin
  (history.json -> history/admin.json)
- accounts are CLI-managed only: python -m server.users add|rm|list
  (no self-signup on an internet-exposed app); /signup route removed,
  login page back to username + password
- per-user 30-day signed session cookie (payload carries the
  username), per-user lockout, GET /api/me, POST /account/delete
- per-user watch history: server/data/history/<user>.json; ANIWEB_DATA
  env override for the data dir
- header chip: logged-in user, logout, delete account
- tests/: throwaway-server suite (port 8399, temp data dir) — 9 HTTP
  tests + 2 Playwright browser tests (login UI, real video playback
  behind auth); runs via python tests/run.py

server/app.py

@@ -6,46 +6,71 @@ Cloudflare workaround) and rewrites playlist URIs to go through itself.
 """
 import base64
 import json
+import os
 import time
 from pathlib import Path
 from urllib.parse import quote, urljoin
 
-from fastapi import Body, FastAPI, HTTPException, Query
+from fastapi import Body, FastAPI, HTTPException, Query, Request
 from fastapi.responses import FileResponse, JSONResponse, RedirectResponse, Response
 from fastapi.staticfiles import StaticFiles
 from itsdangerous import BadSignature, TimestampSigner
 
-from . import credentials, upstream
+from . import upstream, users
 
 ROOT = Path(__file__).parent.parent
 app = FastAPI(title="ani-web")
 
-# ---------- auth: single user, signed cookie ----------
-_SIGNER = TimestampSigner(credentials.load()["secret"])  # exits with instructions if unset
+# ---------- auth: multi-user, signed cookies ----------
+users.migrate_legacy()
+_SIGNER = TimestampSigner(users.get_secret())
 _SESSION = "aniweb_session"
 _SESSION_AGE = 30 * 86400
 _PUBLIC = {("/login", "GET"), ("/login", "POST")}
 
-# ponytail: in-memory lockout, single process — 5 fails lock for 15 min
-_lockout = {"fails": 0, "until": 0.0}
+# ponytail: in-memory lockout per username, single process — 5 fails -> 15 min
+_lockout: dict = {}
 
 
-def _auth_ok(request) -> bool:
+def _session_user(request) -> str | None:
     try:
-        return _SIGNER.unsign(request.cookies.get(_SESSION, ""),
-                              max_age=_SESSION_AGE) == b"ok"
+        payload = _SIGNER.unsign(request.cookies.get(_SESSION, ""), max_age=_SESSION_AGE)
     except BadSignature:
-        return False
+        return None
+    return payload.decode().split(":", 1)[1] if payload.startswith(b"user:") else None
+
+
+def _lock(user: str, pw: str) -> str:
+    lo = _lockout.setdefault(user, {"fails": 0, "until": 0.0})
+    if time.time() < lo["until"]:
+        return "locked"
+    if users.verify(user, pw):
+        lo.update(fails=0, until=0.0)
+        return "ok"
+    lo["fails"] += 1
+    if lo["fails"] >= 5:
+        lo.update(fails=0, until=time.time() + 900)
+    time.sleep(0.5)  # slow down brute force
+    return "bad"
 
 
 @app.middleware("http")
 async def require_auth(request, call_next):
-    if (request.url.path, request.method) in _PUBLIC or _auth_ok(request):
+    if (request.url.path, request.method) in _PUBLIC:
         return await call_next(request)
-    if request.url.path.startswith("/api/"):
-        return JSONResponse({"detail": "not authenticated"}, status_code=401)
-    next_ = request.url.path + (f"?{request.url.query}" if request.url.query else "")
-    return RedirectResponse(f"/login?next={quote(next_, safe='')}", status_code=302)
+    user = _session_user(request)
+    if not user:
+        if request.url.path.startswith("/api/"):
+            return JSONResponse({"detail": "not authenticated"}, status_code=401)
+        next_ = request.url.path + (f"?{request.url.query}" if request.url.query else "")
+        return RedirectResponse(f"/login?next={quote(next_, safe='')}", status_code=302)
+    request.state.user = user
+    return await call_next(request)
+
+
+def _session_cookie(resp, user: str):
+    resp.set_cookie(_SESSION, _SIGNER.sign(b"user:" + user.encode()).decode(),
+                    max_age=_SESSION_AGE, httponly=True, samesite="lax")
 
 
 @app.get("/login", include_in_schema=False)
@@ -55,19 +80,30 @@ def login_page():
 
 @app.post("/login")
 async def login(payload: dict = Body(...)):
-    if time.time() < _lockout["until"]:
-        return JSONResponse({"detail": "too many attempts, try later"}, status_code=429)
-    if credentials.check(payload.get("password", "")):
-        _lockout.update(fails=0, until=0.0)
-        resp = JSONResponse({"ok": True})
-        resp.set_cookie(_SESSION, _SIGNER.sign(b"ok").decode(),
-                        max_age=_SESSION_AGE, httponly=True, samesite="lax")
+    u = payload.get("username", "").lower()
+    if not u:
+        return JSONResponse({"detail": "username required"}, status_code=400)
+    state = _lock(u, payload.get("password", ""))
+    if state == "ok":
+        resp = JSONResponse({"ok": True, "user": u})
+        _session_cookie(resp, u)
         return resp
-    _lockout["fails"] += 1
-    if _lockout["fails"] >= 5:
-        _lockout.update(fails=0, until=time.time() + 900)
-    time.sleep(0.5)  # slow down brute force
-    return JSONResponse({"detail": "wrong password"}, status_code=401)
+    if state == "locked":
+        return JSONResponse({"detail": "too many attempts, try later"}, status_code=429)
+    return JSONResponse({"detail": "wrong username or password"}, status_code=401)
+
+
+@app.get("/api/me", include_in_schema=False)
+def api_me(request: Request):
+    return {"user": request.state.user}
+
+
+@app.post("/account/delete")
+def delete_account(request: Request):
+    users.remove(request.state.user)
+    resp = JSONResponse({"ok": True})
+    resp.delete_cookie(_SESSION)
+    return resp
 
 
 @app.post("/logout")
@@ -77,40 +113,41 @@ def logout():
     return resp
 
 
-HIST_FILE = Path(__file__).parent / "data" / "history.json"
+HIST_DIR = Path(os.environ.get("ANIWEB_DATA", Path(__file__).parent / "data")) / "history"
 
 
-def _load_hist():
+def _load_hist(user: str):
     try:
-        return json.loads(HIST_FILE.read_text())
+        return json.loads((HIST_DIR / f"{user}.json").read_text())
     except (FileNotFoundError, json.JSONDecodeError):
         return []
 
 
-def _save_hist(entries):
-    HIST_FILE.parent.mkdir(exist_ok=True)
-    # ponytail: unguarded read-modify-write, fine for a single-user tool
-    HIST_FILE.write_text(json.dumps(entries, indent=1))
+def _save_hist(user: str, entries):
+    HIST_DIR.mkdir(exist_ok=True)
+    # ponytail: unguarded read-modify-write per file, fine at this scale
+    (HIST_DIR / f"{user}.json").write_text(json.dumps(entries, indent=1))
 
 
 @app.get("/api/history")
-def api_history():
-    return sorted(_load_hist(), key=lambda e: e.get("t", 0), reverse=True)[:5]
+def api_history(request: Request):
+    return sorted(_load_hist(request.state.user), key=lambda e: e.get("t", 0), reverse=True)[:5]
 
 
 @app.post("/api/history")
-def api_history_post(entry: dict = Body(...)):
+def api_history_post(entry: dict = Body(...), request: Request = None):
     if "ep_id" not in entry:
         raise HTTPException(422, "ep_id required")
     entry["t"] = time.time()
-    entries = _load_hist()
+    u = request.state.user
+    entries = _load_hist(u)
     for i, e in enumerate(entries):
         if e.get("slug_id") == entry.get("slug_id") and e.get("ep_id") == entry.get("ep_id"):
             entries[i] = {**e, **entry}
             break
     else:
         entries.append(entry)
-    _save_hist(sorted(entries, key=lambda e: e.get("t", 0), reverse=True)[:50])
+    _save_hist(u, sorted(entries, key=lambda e: e.get("t", 0), reverse=True)[:50])
     return entry