feat: add Slack OAuth admin authentication - #46
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Adds next-auth v5 (pinned beta) with the Slack OIDC provider. Only administrators of the HackRegina Slack workspace can sign in: the signIn callback verifies the workspace team id and checks is_admin/is_owner via users.info (requires the bot token to have users:read). Sessions are stateless JWTs (12h), so no database is needed. - proxy.ts protects /admin/* and /api/admin/*: pages redirect to /admin/login, APIs get 401 JSON - requireAdmin()/requireAdminOrRedirect() in lib/adminAuth.ts give admin routes and layouts a second, defense-in-depth check - /admin/login renders a Sign in with Slack button and the AccessDenied message for non-admins - /admin is a placeholder shell replaced by the events list in a follow-up PR - Slack requires HTTPS redirect URLs, so local dev uses bun run dev:https Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Stack 1/4 — foundation for the Eventbrite admin dashboard. Next: Eventbrite data layer → events list UI → event detail with show-up predictions.
Summary
next-auth@5.0.0-beta.32(pinned exactly; peer-supports Next 16). JWT sessions (12h), no database.signIncallback verifies the id_token'shttps://slack.com/team_idclaim againstSLACK_TEAM_ID, then callsusers.infowith the bot token and only allowsis_admin || is_owner || is_primary_owner. Fails closed on any error.proxy.ts(Next 16's middleware convention) guards/admin/:path*and/api/admin/:path*— pages redirect to/admin/login?callbackUrl=…, APIs get 401 JSON.requireAdmin()/requireAdminOrRedirect()inlib/adminAuth.tsprovide a second, defense-in-depth check used by the admin layout (and by admin API routes in the next PR)./admin/login: server-action "Sign in with Slack" button; shows the access-denied message for signed-in non-admins; sanitizescallbackUrl(must start with/)./admin: placeholder shell (replaced by the events list in PR 3/4).Configuration (already done on the Slack app "HackRegina" A04G3FDT4TU)
https://hackregina.com/api/auth/callback/slack,https://localhost:3000/api/auth/callback/slackusers:readadded + reinstallAUTH_SECRET,AUTH_SLACK_ID,AUTH_SLACK_SECRET,SLACK_TEAM_ID(+AUTH_URL=https://localhost:3000for local HTTPS dev only)Note: Vercel preview deployments cannot complete Slack OAuth (redirect URLs must be pre-registered), so sign-in is testable locally (
bun run dev:https) and on production.Test plan
bun run lint/bun run buildpass/admin→ 307/admin/login?callbackUrl=%2Fadmin;/api/admin/*→ 401{"error":"Unauthorized"};/,/events,/techmapunaffected/admin; sign-out returns to login; non-admin gets the AccessDenied message🤖 Generated with Claude Code