mangaBookmark/README.md

# Manga Bookmark

Track manga read-progress on **asurascans.com** (a.k.a. asuracomic.net),
**demonicscans.org**, **comix.to**, and **kagane.to** from a phone (Bromite /
mobile Chromium), synced to a self-hosted Go backend so bookmarks unify across
all four sites and all devices.

Two parts:

- **`backend/`** — tiny Go (`net/http` + pure-Go SQLite) sync service. 4 routes,
  static binary, distroless container.
- **`userscript/manga-bookmark.user.js`** — single Bromite-compatible userscript
  (no `GM_*` APIs) that injects an on-page bookmark UI and syncs via `fetch()`.

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

---

## 1. Backend

### Config (env)

| Var | Default | Notes |
|-----|---------|-------|
| `API_TOKEN` | *(required)* | Bearer token shared with the userscript. |
| `ALLOWED_ORIGINS` | Asura + Demonic + Comix + Kagane origins | Comma-separated CORS allowlist. |
| `DB_PATH` | `/data/bookmarks.db` | SQLite file location. |
| `PORT` | `8080` | Plain HTTP; TLS terminated by the proxy. |
| `BROWSER_WS_URL` | `ws://172.28.0.10:9222` | Headless-shell CDP endpoint used to poll Kagane past its JS challenge. Must be an IP or `localhost` — Chrome's DevTools handler 500s any other Host header. |

### Endpoints

| Method | Path | Auth | Description |
|--------|------|------|-------------|
| `GET` | `/bookmarks` | Bearer | All bookmarks (single-user). |
| `PUT` | `/bookmarks/{key}` | Bearer | Upsert one series; returns the row as stored. |
| `DELETE` | `/bookmarks/{key}` | Bearer | Remove one. |
| `GET` | `/healthz` | none | `200 ok`. |
| `GET` | `/u/{token}/manga-bookmark.user.js` | token in path | Serves the userscript with an mtime-derived `@version`. |

`key` is `<site>:<series_id>` — e.g. `asura:trash-of-the-counts-family-f886a8af`,
`demonic:Infinite-Level-Up-in-Murim`, `comix:12345`, or
`kagane:3fa85f64-5717-4562-b3fc-2c963f66afa6`. Sync is last-write-wins.

`updated_at` orders the bookmark list, 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 one. Favouriting a
series or recording a newly published chapter therefore leaves the order alone.
Because the timestamp a client sends is only a candidate, `PUT` echoes the row
**as stored** and clients adopt that rather than their own payload.

### Develop / test

```bash
cd backend
go test ./...                          # unit + handler tests
CGO_ENABLED=0 go build                 # static binary
```

### Run the stack

```bash
cp .env.example .env
# edit .env: set API_TOKEN (openssl rand -hex 32)

docker compose up -d --build           # binds 127.0.0.1:8080
```

Smoke test:

```bash
TOKEN=$(grep '^API_TOKEN=' .env | cut -d= -f2)
curl -s localhost:8080/healthz                                    # ok
curl -s localhost:8080/bookmarks                                  # 401
curl -s -H "Authorization: Bearer $TOKEN" localhost:8080/bookmarks # []
curl -s -X PUT -H "Authorization: Bearer $TOKEN" -H 'Content-Type: application/json' \
  -d '{"title":"Test","last_chapter":"Chapter 1","last_chapter_num":1}' \
  localhost:8080/bookmarks/asura:test-1
curl -s -i -X OPTIONS -H 'Origin: https://asurascans.com' \
  -H 'Access-Control-Request-Method: PUT' \
  localhost:8080/bookmarks/asura:test-1 | grep -i access-control   # 204 + CORS headers
```

### Deploy behind your reverse proxy

Route `https://manga-api.<domain>` → the service on `:8080` (TLS at the proxy).

- **Host proxy** (nginx/Caddy on the host): the base compose already binds
  `127.0.0.1:8080`; point the proxy `proxy_pass http://127.0.0.1:8080;`.
- **Docker proxy** (Traefik/nginx in a container on its own network): use the
  override, which drops the published port and joins the shared network:

  ```bash
  docker network create proxy            # once, if it doesn't exist
  docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d --build
  ```
  Set `PROXY_NETWORK` in `.env` if your network isn't named `proxy`.

Verify: `https://manga-api.<domain>/healthz` returns `ok` over valid TLS (no
mixed-content), and an `OPTIONS` preflight from a real site origin returns the
CORS headers.

---

## 2. Userscript

### Configure

Edit the config block at the top of `userscript/manga-bookmark.user.js`:

```js
const API_BASE = "https://manga-api.<domain>"; // no trailing slash
const API_TOKEN = "<same token as backend>";
```

The token lives in the userscript's **isolated world** — the manga sites' own
JS cannot read it.

### Install on Bromite (mobile)

Bromite runs Chromium's native userscript engine (no Tampermonkey needed):

1. Bromite → **Settings → User scripts** → enable user scripts (allow the
   permission prompt).
2. Save the configured `manga-bookmark.user.js` to the device (or open its raw
   URL). Bromite detects the `.user.js` and offers to install it.
3. Confirm the install; the `@match` list covers both sites.
4. Open a series on either site — a 📑 button appears bottom-right.

> Exact menu wording varies by Bromite build; if "User scripts" is absent,
> update Bromite or use a build with userscript support.

### Desktop iteration (optional)

The script is `GM_*`-free, so it also runs in Tampermonkey/Violentmonkey on
desktop for faster testing — install the same file unchanged.

### Use

- **Bookmark**: on a series or chapter page, open the panel → **+ Bookmark this**.
- **Auto-progress**: opening a chapter of a bookmarked series records it when the
  chapter number ≥ the stored one (re-reading older chapters never regresses
  progress; unparseable numbers set the current chapter).
- **Manual override**: panel → **Edit** on any row forces a specific chapter.
- **Continue**: jumps to the last-read chapter (or the series page).
- **Latest chapter**: rows read `Read: … · Latest: …` once the newest published
  chapter is known and it is ahead of your progress. See below for how that is
  found.
- **Favourites**: the ☆ on any row toggles it; the **★ Favourites** tab narrows
  the list. Favourited series still appear under **All**. The flag syncs, so it
  follows you across devices; the chosen tab does not persist.
- **Archive**: the **Archive** button on any row parks a series — it drops out
  of **All** and **★ Favourites** and moves to the **Archived** tab. The server
  keeps checking it for new chapters, so it is worth coming back to. Archiving
  does not touch read progress, and reading an archived series leaves it
  archived.
- **Finished**: series you have completed live in a **Finished** tab in the web
  UI only. It is set there and nowhere else — the API rejects the value — and
  finished series are hidden from every userscript tab and are no longer polled
  for new chapters.
- Bookmarks made on Asura appear when the panel is opened on Demonic, and vice
  versa — the backend is the shared store.

Neither favouriting nor learning a new chapter reorders the list — only reading
progress does.

Offline / backend down: changes are cached in `localStorage` and retried on the
next successful load (last-write-wins).

#### How "latest chapter" is found

Only a series page lists every chapter (a reader page links just its
neighbours), and the backend cannot fetch either site — Cloudflare blocks
server-side requests, and neither site offers an API or feed to poll. So the
userscript does the looking, from your own browser session:

- Opening a bookmarked series page records its newest chapter directly.
- Otherwise it fetches series pages in the background — **same-origin only**, so
  browsing Asura refreshes Asura bookmarks and Demonic refreshes Demonic. One
  series per navigation, and at most one check per series every 4 hours
  (`LATEST_CHECK_BATCH` / `LATEST_CHECK_THROTTLE_MS`). Failures are silent and
  simply retried after the window.

Freshness is tracked per device in `localStorage` under `mangabm:lastchecked`
and is deliberately not synced, since each device checks on its own.

This means a bookmark is as current as its last check — not the moment a
chapter drops. Nothing can be instant here: neither site offers push, feeds, or
an API.

---

## Adapter reference (verified live 2026-07-24)

The site adapters key everything off URL regex, with `title`/`cover` from
`og:title` / `og:image`. Confirmed against live pages via Playwright:

| Site | Series URL | Chapter URL | `series_id` |
|------|-----------|-------------|-------------|
| **Asura** (`asurascans.com`) | `/comics/<slug-hash>` | `/comics/<slug-hash>/chapter/<n>` | `<slug-hash>` |
| **Demonic** (`demonicscans.org`) | `/manga/<slug>` | `/title/<slug>/chapter/<n>/<page>` (`chaptered.php?manga=<id>&chapter=<n>` 301s here) | `<slug>` |
| **Comix** (`comix.to`) | `/title/<id>-<slug>` | `/title/<id>-<slug>/<uploadId>-chapter-<n>` | `<id>` |
| **Kagane** (`kagane.to`) | `/series/<uuid>` | `/series/<uuid>/reader/<bookUuid>` | `<uuid>` |

Notes:
- **`asuracomic.net` deep links are dead (re-checked 2026-07-25).** They 301 to
  the `asurascans.com` **root**, discarding the path, at the edge — before the
  userscript gets a document — so nothing client-side can rescue them. Reach
  series through `asurascans.com`. The host stays matched in case the redirect
  starts preserving paths again.
- Asura `og:title` carries a `Chapter N - Read Online \| Asura Scans` suffix that
  the adapter strips; Demonic chapter `og:title` is `<Title> Chapter N`.
- Demonic's `<slug>` is identical on `/manga/…` and the canonical `/title/…`
  reader, so a bookmark set from the series page and the auto-update from the
  reader resolve to the **same key**.
- Asura showed no Next.js markers on the live site, so navigation uses a
  framework-agnostic watcher (history patch + polling) rather than a Next-only
  hook — works for client-routed and full-reload sites alike.

If either site changes its URL shape, update the regex in the matching adapter
in `userscript/manga-bookmark.user.js` and re-verify.