--lan key persists across restarts; stale tabs get a readable 403

The key rotated on every server restart, stranding every phone that
held the previous cookie — during active development that guaranteed a
wall of refusals from stale polling tabs after each restart. The key
now lives in data/.lan_key (gitignored, 0600 — the Playwright-state
treatment for credential-adjacent files) and is reused across
restarts; delete the file to rotate. A keyless browser navigation now
gets a one-line HTML page saying what to do instead of raw JSON.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016jXZFSTZQKzAC8fqpWSz9g

.gitignore

@@ -1,6 +1,7 @@
 # Secrets & credential-adjacent state
 .env
 *.storage_state.json
+data/.lan_key
 playwright/.auth/
 storage_state.json
 

data/title_edits.json

@@ -47,5 +47,10 @@
       "IMG_4502.jpeg"
     ],
     "confidence": "high"
+  },
+  {
+    "match": "ACTION CASTLE",
+    "title_raw": "Parsely",
+    "confidence": "high"
   }
 ]

data/title_removals.json

@@ -64,5 +64,11 @@
     "photos": [
       "IMG_4507.jpeg"
     ]
+  },
+  {
+    "title": "ACTION CASTLE I",
+    "photos": [
+      "IMG_4573.jpeg"
+    ]
   }
 ]

data/titles.json

@@ -1656,7 +1656,7 @@
     "title_normalized": "botany expansion perilous perfumes poisonous carnivorous parasitic and bizarre plants"
   },
   {
-    "title_raw": "ACTION CASTLE",
+    "title_raw": "Parsely",
     "confidence": "high",
     "publisher_hint": "Memento More Computers Inc.",
     "edition_hint": "",
@@ -1666,20 +1666,7 @@
     "source_photos": [
       "IMG_4573.jpeg"
     ],
-    "title_normalized": "action castle"
-  },
-  {
-    "title_raw": "ACTION CASTLE I",
-    "confidence": "medium",
-    "publisher_hint": "",
-    "edition_hint": "",
-    "year_hint": null,
-    "language_hint": "English",
-    "art_notes": "Dark spine box among a stack of illustrated game boxes on the book cover art",
-    "source_photos": [
-      "IMG_4573.jpeg"
-    ],
-    "title_normalized": "action castle i"
+    "title_normalized": "parsely"
   },
   {
     "title_raw": "SIX-GUN SHOWDOWN",

src/bggpipe/config.py

@@ -95,6 +95,12 @@ class Config:
             self.data_dir / "collection_snapshot_expansions.xml",
         )
 
+    @property
+    def lan_key_path(self) -> Path:
+        # the --lan access key, persisted so restarts don't strand phones'
+        # cookies; credential-adjacent like Playwright state — gitignored
+        return self.data_dir / ".lan_key"
+
     @property
     def storage_state_path(self) -> Path:
         # cwd-relative on purpose (credential-adjacent, gitignored) but

src/bggpipe/webreview.py

@@ -360,14 +360,17 @@ def create_app(
                     f"(host {host!r}): missing or wrong access key",
                     err=True,
                 )
-                return JSONResponse(
-                    {
-                        "detail": "missing or wrong access key — open the "
-                        "exact URL printed where the server started "
-                        "(it ends in ?k=...)"
-                    },
+                hint = (
+                    "missing or wrong access key — open the exact URL "
+                    "printed where the server started (it ends in ?k=...)"
+                )
+                if "text/html" in request.headers.get("accept", ""):
+                    # a tapped link or stale tab: a person is looking
+                    return HTMLResponse(
+                        f"<h1>bggpipe: access key needed</h1><p>{hint}</p>",
                         status_code=403,
                     )
+                return JSONResponse({"detail": hint}, status_code=403)
             if request.method in ("GET", "HEAD") and request.query_params.get("k"):
                 # the key arrived in the typed URL: commit it to a cookie
                 # via redirect BEFORE the document loads (the preload
@@ -1102,6 +1105,22 @@ def _dev_app() -> FastAPI:
     return create_app(load_config(Path(path) if path else None), lan_token=token)
 
 
+def _lan_key(cfg: Config) -> str:
+    """The --lan access key: created once, reused across restarts so a
+    phone's cookie keeps working. Delete the file to rotate the key."""
+    path = cfg.lan_key_path
+    if path.exists():
+        key = path.read_text().strip()
+        if key:
+            return key
+    key = secrets.token_urlsafe(16)
+    path.parent.mkdir(parents=True, exist_ok=True)
+    fd = os.open(path, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 0o600)
+    with os.fdopen(fd, "w") as handle:
+        handle.write(key + "\n")
+    return key
+
+
 def run_web_review(
     cfg: Config,
     *,
@@ -1115,10 +1134,7 @@ def run_web_review(
     import uvicorn
 
     url = f"http://127.0.0.1:{port}{landing}"
-    # 16 bytes = 128-bit key: standard session-credential strength. The
-    # cost is a longer one-time URL to get onto the phone — copy it, or
-    # type it once; the cookie remembers it from then on.
-    token = secrets.token_urlsafe(16) if lan else None
+    token = _lan_key(cfg) if lan else None
     if lan:
         primary = _route_ip()
         spares = sorted(
@@ -1150,7 +1166,8 @@ def run_web_review(
         typer.echo(
             "  --lan: no login beyond that key — anyone who has it can run "
             "stages, change your data, and (once unlocked) drive uploads "
-            "to your BGG account. Use only on a network you trust."
+            "to your BGG account. Use only on a network you trust. (The "
+            "key persists across restarts; delete data/.lan_key to rotate.)"
         )
     else:
         typer.echo(

tests/test_webreview.py

@@ -1021,6 +1021,12 @@ def test_run_web_review_lan_branch_binds_and_warns(tmp_path, monkeypatch, capsys
     wr.run_web_review(cfg, port=9999, lan=True)
     out = capsys.readouterr().out
     assert captured["host"] == "0.0.0.0"
+    # the key persists (0600) so restarts don't strand the phone's cookie
+    assert (cfg.lan_key_path.stat().st_mode & 0o777) == 0o600
+    key = cfg.lan_key_path.read_text().strip()
+    assert f"?k={key}" in out
+    wr.run_web_review(cfg, port=9999, lan=True)
+    assert f"?k={key}" in capsys.readouterr().out  # same key after restart
     # the default-route address leads; other interfaces are fallbacks
     assert "on your phone, open: http://192.168.1.5:9999/?k=" in out
     fallback = next(line for line in out.splitlines() if "try:" in line)
@@ -1030,3 +1036,12 @@ def test_run_web_review_lan_branch_binds_and_warns(tmp_path, monkeypatch, capsys
     assert "Use only on a network you trust" in out
     wr.run_web_review(cfg, port=9999, lan=False)
     assert captured["host"] == "127.0.0.1"
+
+
+def test_lan_403_is_html_for_navigations(tmp_path):
+    cfg = make_cfg(tmp_path)
+    app = create_app(cfg, client=unauthorized_client(tmp_path), lan_token="sekret")
+    phone = TestClient(app, base_url="http://192.168.1.99:8377")
+    res = phone.get("/titles", headers={"accept": "text/html,application/xhtml+xml"})
+    assert res.status_code == 403
+    assert "access key needed" in res.text  # a person sees prose, not JSON