mangaBookmark/CLAUDE.md

# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Status

Greenfield. Only `plans/mangaBookmark.md` exists — no code yet. That plan is the spec; read it before building. Two deliverables: a Go sync backend and a single Bromite-compatible userscript.

## What this is

A manga read-progress tracker for a user reading on **asurascans.com** (the current domain; asuracomic.net 301s here) and **demonicscans.org** from **Bromite** (mobile Chromium). A userscript injects on-page UI (floating button + slide-in panel) and syncs progress to a self-hosted Go backend so bookmarks unify across both sites and across devices.

## Hard constraints (these drive the design — do not violate)

Bromite uses Chromium's **native** userscript engine, not Tampermonkey:
- **No `GM_*` APIs anywhere.** No `GM_setValue`/`GM_getValue` (use page `localStorage`), no `GM_registerMenuCommand` (inject on-page UI), no `GM_xmlhttpRequest` for cross-origin (use plain `fetch()`). Keeping the script GM-free also lets it run in desktop Tampermonkey/Violentmonkey for faster iteration.
- Cross-origin `fetch()` works **only** against a CORS-enabled backend. Manga sites are `https://`, so backend **must be HTTPS** (mixed-content block otherwise).
- Asura and Demonic are **separate origins with separate `localStorage`** — a shared remote store is the only way to unify bookmarks. Cloud sync is required, not optional.
- Userscript runs in an **isolated world**, so the embedded API token is safe from the site's JS.
- Cloudflare's block on fetching the manga sites is **IP-reputation-based, not universal — and not reliably reproducible.** Verified 2026-07-26: plain `curl` from both the CGNAT dev machine *and* the deployed VPS got clean 200s with real HTML on both asurascans.com and demonicscans.org (homepage, series, chapter pages) — no interactive Turnstile challenge from either IP at test time. This contradicts an earlier, untested assumption that the CGNAT dev IP would be blocked; it was not, at least on this date. Treat "does curl work right now" as a live, time-varying fact to re-check, not a fixed property of a given machine — Cloudflare's bot scoring can flip a previously-clean IP without notice. Any backend fetcher still needs a graceful-degrade path for when it does get challenged, and adapters should be **verified against live pages** (Playwright MCP, on-device devtools, or a direct probe) before finalizing, not assumed from a single earlier test.

## Architecture

```
Bromite userscript (isolated world, per-site adapters, localStorage cache)
   -- fetch() HTTPS -->  reverse proxy (TLS + CORS)  -->  Go net/http  -->  SQLite (volume)
```

- **Backend** (`backend/`): stdlib `net/http` (a handful of routes, no framework) + `modernc.org/sqlite` (pure Go, `CGO_ENABLED=0` -> static binary -> distroless/scratch image). The reverse proxy terminates TLS; the Go service listens plain `:8080`.
- **Single-user store.** One `bookmarks` table keyed `<site>:<series_id>` (`asura`|`demonic`). Sync is **last-write-wins**. Schema and endpoint list are in the plan.
- **Endpoints:** `GET /bookmarks`, `PUT /bookmarks/{key}` (upsert; see `updated_at` rule below), `DELETE /bookmarks/{key}`, `GET /healthz` (no auth).
- **Web UI:** the same binary serves a password-gated browser UI on a second
  hostname — `GET /` (list, or login page when there is no session),
  `POST /login`, `POST /logout`, `GET /static/*`, and htmx fragment endpoints
  under `/ui/*`. Templates and assets are `go:embed`-ed, so `backend/Dockerfile`
  must copy `templates/` and `static/` as well as `*.go`. Sessions are stateless
  HMAC cookies keyed off `API_TOKEN`; `WEB_PASSWORD` gates them and, when empty,
  the web routes are not registered at all. UI mutations read-modify-write
  through `Store.Get` + `Store.Upsert` so the `updated_at` rule stays in one
  place. See `docs/superpowers/specs/2026-07-25-web-ui-design.md`.
- **Latest-chapter poller:** a ticker goroutine in the same binary re-checks
  each bookmarked series' newest published chapter from the backend's own
  network access, so `latest_chapter` stays fresh when the user is not
  browsing. It is a *second, parallel* signal — the userscript keeps its own
  `maybeCaptureLatestOnSeriesPage`/`backgroundRefreshLatest` logic unchanged.
  Two independent clocks: a per-bookmark cooldown (`latest_checked_at` column,
  enforced by `Store.DueForLatestCheck`'s WHERE clause) and a wake interval.
  The row is stamped *before* the fetch so a broken series waits out a full
  cooldown instead of retrying every tick, and writes go through
  `Store.Get` + `Store.Upsert` so a new chapter never reorders the list.
  Fetches use `bogdanfinn/tls-client` with a Chrome profile as defence in depth
  against fingerprint-based blocking; any failure logs and skips. See
  `docs/superpowers/specs/2026-07-26-server-latest-chapter-polling-design.md`.
  The poller's `Store.Get` + `Store.Upsert` is not wrapped in a transaction, so
  a userscript `PUT` that commits between the two can be overwritten by the
  poller's stale re-read — reverting that read progress and, since the stored
  value now differs, moving `updated_at` and reordering the list. This is a
  known, accepted limitation for a single-user deployment, not a bug to fix.
- **`updated_at` drives list order, so it moves only on real reading progress:** the server applies its timestamp when the row is new or `last_chapter_num` changes, and otherwise keeps the stored value — favouriting a series or recording a newly published chapter must not reorder the list. `PUT` therefore returns the row **as stored**, and clients must adopt that response rather than their own payload. See `plans/2026-07-25-bookmark-list-favorites-design.md` §4.
- **Config via env:** `API_TOKEN`, `ALLOWED_ORIGINS` (comma list), `DB_PATH`
  (default `/data/bookmarks.db`), `PORT` (default `8080`), `WEB_PASSWORD`
  (gates the browser UI; unset disables it),
  `LATEST_CHAPTER_POLL_ENABLED`/`_COOLDOWN`/`_INTERVAL`/`_BATCH`/`_STAGGER`
  (background latest-chapter poller; defaults on, `1h`/`10m`/`14`/`20s`).

### Userscript structure (single IIFE, `manga-bookmark.user.js`)

1. **Site adapters** — one per host, `detect(location, document)` returns page `type` + IDs. Identify type/IDs from **URL regex** (most stable); pull `title`/`cover` from **`og:title`/`og:image` meta tags**, not CSS classes.
2. **API client** — `apiGet/apiPut/apiDelete` with bearer header; `localStorage` key `mangabm:cache` for instant render + offline fallback.
3. **Progress logic** — auto-upsert `last_chapter` only when `chapterNum >= stored last_chapter_num` (re-reading old chapters must not regress progress; unparseable -> set current). Manual panel override forces any value.
4. **UI** — rendered inside a **Shadow DOM** root to isolate from site CSS (critical on mobile).
5. **SPA navigation** — Asura is Astro, client-routed on the comic/chapter pages: patch `history.pushState`/`replaceState` + listen `popstate`, re-run `detect()` on URL change so auto-update fires without reload. Demonic uses classic reloads (initial `document-idle` run suffices).

### Live URL shapes (verified 2026-07-26, may drift — re-check against live pages before trusting)

- **asurascans.com**: series `/comics/<slug>` (slug carries a trailing hash-like suffix, e.g. `-f886a8af`), chapter `/comics/<slug>/chapter/<n>`. Astro-rendered; chapter links are present in raw server HTML (no client-side-only render blocking a server fetch).
- **demonicscans.org**: series `/manga/<slug>` (slug may URL-encode punctuation, e.g. `%2527` for `'`), chapter `/title/<slug>/chapter/<n>/<page>` (the older `chaptered.php?manga=<id>&chapter=<n>` form still exists as a redirect and is what series-page chapter-list anchors link through).

## Commands (once code exists)

Backend (`cd backend`):
- Test all: `go test ./...`
- Single test: `go test -run TestName ./...`
- Build static binary: `CGO_ENABLED=0 go build`

Local stack: `docker compose up` (named volume mounted at `/data`, `restart: unless-stopped`).

Smoke test: `curl` the endpoints with `Authorization: Bearer <token>`; confirm `OPTIONS` preflight returns CORS headers and `/healthz` returns 200.

## Forge: Gitea, not GitHub

`origin` is a self-hosted Gitea instance (`gitea.violetcrown.my.id`), so **`gh` does not work here — use `tea` (Gitea CLI) for anything past plain git.** Common ones:

- Open a PR: `tea pr create --head <branch> --base main --title "..." --description "..."`
- List / view / check out: `tea pr list`, `tea pr <n>`, `tea pr checkout <n>`
- Issues: `tea issue create`, `tea issue list`
- Auth lives in `tea login`, not a `GH_TOKEN` env var.

`tea` prints its output as rendered boxes rather than plain text; the PR URL lands on the last line.

## Security invariants

- Auth on `/bookmarks*`: require `Authorization: Bearer <API_TOKEN>`, **constant-time compare**, 401 otherwise.
- CORS: reflect `Origin` only when in `ALLOWED_ORIGINS`; allow `GET,PUT,DELETE,OPTIONS` + headers `Authorization,Content-Type`; answer preflight `OPTIONS` with `204`.

## Relevant skills

`multi-stage-dockerfile` and `docker-compose-orchestration` for the container work (referenced in the plan).

## graphify

This project has a knowledge graph at graphify-out/ with god nodes, community structure, and cross-file relationships.

Rules:
- For codebase questions, first run `graphify query "<question>"` when graphify-out/graph.json exists. Use `graphify path "<A>" "<B>"` for relationships and `graphify explain "<concept>"` for focused concepts. These return a scoped subgraph, usually much smaller than GRAPH_REPORT.md or raw grep output.
- If graphify-out/wiki/index.md exists, use it for broad navigation instead of raw source browsing.
- Read graphify-out/GRAPH_REPORT.md only for broad architecture review or when query/path/explain do not surface enough context.
- After modifying code, run `graphify update .` to keep the graph current (AST-only, no API cost).