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feat(extension): probe shows current state before click; v1.0.6
Operator-asked 2026-05-31 (during sidecar synthetic anchor cleanup):
"the add source/subscription button idea to the firefox extension so
it can tell me if a source/artist is added or not and offer an option
to add it if it isn't." Plan tracked in Scribe task #507.

## Backend

- `ExtensionService.probe(url)` — read-only resolution. Reuses
  `_derive` for platform+slug, then 2 SELECTs. Returns one of:
  - `source_match` (exact (artist, platform, url) Source exists)
  - `artist_match` (artist exists, this URL isn't a Source yet;
     collapses the sidecar-synthetic-only case from v26.06.01.0)
  - `new` (neither exists)
  - `unknown_platform` (URL didn't match any artist-page regex)
- `GET /api/extension/probe?url=...` route with `X-Extension-Key`
  auth posture matching `/quick-add-source`. Read-only, side-effect
  free.
- 6 backend tests in tests/test_api_extension.py covering each state
  + auth + invalid URL.

## Extension

- `api.js`: `probeSource(url)` mirroring `quickAddSource` shape.
- `background.js`: `PROBE_SOURCE` + `OPEN_ARTIST_PAGE` handlers. The
  latter strips the `/api` suffix from configured `apiUrl` (placeholder
  format per options.html) and opens `${base}/artist/{slug}` in a new
  tab via `browser.tabs.create`.
- `content-script.js`: probe-first render — on page-load and SPA
  navigation, asks the backend for the URL's state and renders the
  chip in the matching color/copy on FIRST paint instead of flashing
  generic "Add" and updating after. Click handler branches:
  `source_match` → OPEN_ARTIST_PAGE; `artist_match`/`new` → existing
  ADD_AS_SOURCE flow (then re-probes so the chip flips green
  immediately, no wait for next nav).
- `content-script.css`: three state-color modifiers
  (--new, --artist-match, --source-match) on the FC parchment-on-slate
  palette. Sage for already-added, amber for artist-exists, accent
  orange for new.

## Versioning

- `extension/manifest.json` + `extension/package.json` → 1.0.6.
  build.yml's sign-extension job will fire on push to main since no
  `ext-1.0.6` Forgejo/Gitea release exists yet — exercises the
  regenerated AMO keys end-to-end.

## Behavior on the sidecar-synthetic case

Filesystem-imported "Dymkens"-style artist with only a sidecar
synthetic Source: probe returns `artist_match` (not `new`), so the
chip reads "+ Add Patreon source to Dymkens" rather than offering to
recreate the artist. Clicking adds the real Source; existing
`_source_for_sidecar` preference logic (v26.06.01.0) routes future
gallery-dl Posts to the real one.
2026-06-01 00:41:17 -04:00
..