[Backend+Frontend] Campaign invites with expiry, usage limits and per-campaign join approval; fix the INVITE_CODE sign-up gate #643
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opened 2026-09-14 03:25:40 +00:00 by claude-bot
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rbrooks/Quest-Board#643
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Phase 0 of #642. Carried over from the investigation on #534 (comment 39607), where the owner chose option D.
The problem
1. Campaign invites never expire and have no usage limit.
Each campaign has one
campaigns.invite_code(secrets.token_urlsafe(8),campaign_service.py:104). Anyone can use it any number of times, forever. It stops working only when the GM regenerates it, or the campaign is archived or soft-deleted. A link pasted into a group chat once stays a way into that campaign's transcripts and summaries indefinitely.2. With
INVITE_CODEset, no new user can sign up through the UI.bb77cebremoved the invite-code field from the login page, but kept the backend gate (routers/auth.py:204-211).invite_codeany more, so the gate compares""against the instance code and refuses everyone. This happens after the full identity-provider round trip, and throws awaynext_url./join/<code>link is refused too: the campaign code reaches the callback only insidenext_url.Decisions already made (#642)
INVITE_CODEset, a valid, redeemable campaign invite satisfies the registration gate for that sign-up. D bounds the risk, since a leaked link expires and runs out.Design
Data (one migration, raw SQL per the house rule)
campaign_invites:id,campaign_id(FK, cascade)code(text, unique)label(nullable, e.g. "for Sam")created_by(FK users,SET NULL),created_atexpires_at(nullable),max_uses(nullable),use_count(default 0)revoked_at(nullable)invite_redemptions:id,invite_id,user_id,campaign_id,redeemed_at,outcome(joined | requested). This is the audit trail: which link each member arrived through.campaigns.join_requires_approval: boolean, defaultfalse.campaign_join_requeststable, not as a status oncampaign_members. Membership is checked in many places; a pending row incampaign_memberswould grant access anywhere a status filter was forgotten. A separate table fails closed.campaigns.invite_codebecomes an invite row, withexpires_at = now() + 7 days,max_usesNULL, andlabel"Original invite link". Then dropcampaigns.invite_code.Codes stay stored in plaintext, deliberately. A GM needs to copy an active link again, and a database leak already exposes everything an invite would open. With expiry, hashing costs usability and buys little. #642 floated hashing; this reverses it.
Redemption (one service function; every path uses it)
redeem_invite(db, code, user):SELECT … FOR UPDATE).use_count >= max_uses.use_count, record the redemption, then either join asplayeror create a join request, depending onjoin_requires_approval.The dashboard Join box (
POST /api/campaigns/join), the/join/<code>page, and the OIDC sign-up path all call it. Today there are two duplicated lookups (campaign_service.join_campaign,routers/invites.py:60-65); both go.Refusals don't leak. The unauthenticated preview (
GET /api/invites/{code}) returns the campaign name only for a redeemable invite. Expired, used-up and revoked invites all return one generic "this invite link is no longer valid, ask your GM for a new one", with no campaign details.Sign-up gate
login: whennextmatches the existing/join/<code>allowlist (auth.py:61,70), store the code in the OIDC state payload in Redis DB 0 (store_pkce_state).callback, new user:INVITE_CODEis unset, or the instance code matches, or the stored campaign code is redeemable right now.hmac.compare_digest; a non-ASCIIstrraises inside thetryand surfaces as "A database error occurred".exceptatauth.py:254-258.GM-facing UI
InvitePanelbecomes an invite list:Docs
help/running-your-first-campaign.md:54-56) andhelp/joining-a-campaign.md..env.example(INVITE_CODEtext).docs/API.md:95,119: the gate returns a 302 to/auth-error, not the 403 it documents.docs/ROADMAP-COMPLETED.md:16, which says the gate was removed.ARCHITECTURE.md:152.Out of scope
bot/), so noBOT_CONTRACT_VERSIONbump.Tests
The OIDC callback has no tests today (
tests/test_auth_routes.pyhas two cookie tests). Seed state withstore_pkce_state, and mockfetch_oidc_discovery,exchange_code_for_tokensandfetch_userinfo.INVITE_CODEset, no code: refused, and nousersrow.next=/join/<code>: user created and joined;use_count1; redemption row written.nextthat isn't allowlisted: ignored.max_uses=1invite; exactly one succeeds.Size
Large. One migration; auth, invites and campaigns routers and services;
InvitePanel,CampaignDetail,JoinCampaignand the dashboard Join box; docs. One PR, because droppingcampaigns.invite_codebreaks the current UI in any intermediate state.Interaction with #644 (campaign ownership), which can land before or after this.
Picking this up now (owner go-ahead 2026-09-13). Building on a branch off main
d02a6d4, with migrationd3e4f5a6b7c8chained onc2d3e4f5a6b7. #644 follows once this merges, because the two rewrite the same campaign router, service, member list and migration chain.Done in #647. CI run 1096 passed. Before merging, the overlapping test files were rerun against main with #646 merged in: 246 passed.
What shipped (details in the PR):
redeem_invitepath with a row lock. The two-connection race test is mutation-checked.INVITE_CODEset: a redeemable campaign invite admits a new user, and the user and redemption are created in one savepoint.d3e4f5a6b7c8: existing codes expire 7 days after upgrade.can_manage_membershipis the single hook where #644 adds the owner check.Where the build interpreted the spec (all in the PR):
{outcome, campaign_id, campaign_name}, not a campaign.Small follow-ups, not filed as issues yet:
fetch_oidc_discovery()in the callback returns a 500 instead of the error page.usersrows behind.ARCHITECTURE.mdstill listscampaign_members.character_*columns.