J 8a0c5f6ff2 feat(slack): OAuth self-serve install backend (MUL-3666) ...

Add the in-product OAuth install flow that creates Slack installations, the
keystone the B2 connector consumes.

- slack.InstallService: Begin (build authorize URL, seal workspace/agent/
  initiator into the OAuth state), Complete (verify state, exchange code via
  oauth.v2.access, upsert channel_type='slack' install with the bot token
  encrypted at rest, auto-bind the installer's Slack id so their first message
  is not dropped), plus List/Get/Revoke. State is stateless: sealed with the
  deployment secretbox + an embedded expiry, no session store.
- HTTP handlers (handler/slack.go): member-visible list, admin-only begin +
  revoke, and the public OAuth callback (recovers context from the sealed state,
  redirects the browser back to Settings → Integrations with a result flag).
- Routes + wiring: workspace-scoped list/begin/revoke mirror the Lark
  admin/member split; the callback is a public route like GitHub's. Built from
  MULTICA_SLACK_CLIENT_ID/SECRET (+ redirect derived from MULTICA_PUBLIC_URL,
  override MULTICA_SLACK_REDIRECT_URL; scopes via MULTICA_SLACK_SCOPES).
- Realtime: slack_installation:created / :revoked events.

Verified: go build ./..., go vet, gofmt, and go test ./internal/integrations/slack/...
all pass (new install_test.go covers state sign/verify/expiry/tamper, authorize
URL, code exchange + encrypted upsert + installer bind, and oauth error paths).

Co-authored-by: multica-agent <github@multica.ai>

2026-06-25 15:59:14 +08:00

..

events.go

feat(slack): OAuth self-serve install backend (MUL-3666)

2026-06-25 15:59:14 +08:00

messages.go

MUL-3618: dispatch daemon feature flag snapshots (#4509)

2026-06-24 16:19:30 +08:00