fix: surface invite-email send failures instead of swallowing them - #752
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SomSamantray wants to merge 14 commits into
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fix: surface invite-email send failures instead of swallowing them#752SomSamantray wants to merge 14 commits into
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sendInviteEmail awaited sendMail without returning its result, so callers always saw undefined instead of whether the send succeeded.
Await sendInviteEmail (previously fire-and-forget) and throw a TRPCError when it fails, on both the create and found-friend paths, so a retry after a failed invite doesn't silently no-op.
Add onError handlers to the invite mutation in AddMembers.tsx and SelectUserOrGroup.tsx so a failed invite email surfaces a toast instead of failing silently, and clean up the optimistic placeholder participant so it doesn't get stranded.
- Add onError to the AddMembers.tsx retry mutation so a second failure isn't silently swallowed (correctness, testing, reliability, adversarial reviewers). - Skip re-sending invite emails to friends who already have a verified account, so inviting an arbitrary existing user no longer triggers an unwanted email (api-contract, adversarial reviewers). - Simplify inviteFriend's disabled-invites check to a direct env.ENABLE_SENDING_INVITES check instead of string-matching an error message (code-quality/reuse reviewers). - Fix mailer.test.ts's mocking-pattern citation to point at the repo's actual jest.mock precedent (coherence reviewer).
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe invite flow now propagates typed delivery errors through tRPC, enforces a per-user cooldown, retries without email delivery when appropriate, and escapes inviter names in HTML email content. ChangesInvite delivery flow
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to Invite email failures are now surfaced to users, while verified users avoid unnecessary messages and failed invite delivery can recover participant state. No concrete current-head merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant User
participant InviteUI
participant inviteFriend
participant UserDatabase
participant Mailer
participant SMTP
User->>InviteUI: Submit email invite
InviteUI->>inviteFriend: Create participant and send invite
inviteFriend->>UserDatabase: Upsert user and claim cooldown
UserDatabase-->>inviteFriend: Claim result
inviteFriend->>Mailer: Await invite email
Mailer->>SMTP: Send escaped HTML email
SMTP-->>Mailer: Delivery result
Mailer-->>inviteFriend: Success or failure
inviteFriend-->>InviteUI: Success or typed error
InviteUI-->>User: Add participant or show toast
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@src/components/AddExpense/SelectUserOrGroup.tsx`:
- Around line 60-63: Update the server-side inviteFriend error handling to
return a machine-readable cause for the dedicated email-delivery failure. In
src/components/AddExpense/SelectUserOrGroup.tsx lines 60-63, branch on that
cause: show errors.invite_email_failed only for delivery failures and use the
generic add-user error otherwise. In src/components/group/AddMembers.tsx lines
96-108, retry without email only for that same cause and avoid the SMTP error
for other failures.
In `@src/components/group/AddMembers.tsx`:
- Line 101: In the AddMembers mutation flow, capture inputValue.toLowerCase() in
a local email variable before the first mutate call, then reuse that captured
email for both mutation requests and any onError recovery so later input changes
cannot alter the invited address.
In `@src/server/api/routers/user.ts`:
- Line 77: Add rate limiting to the invite branch around sendInviteEmail so
repeated requests for the same unverified target cannot send SMTP messages
indefinitely. Enforce a cooldown scoped to both the inviter and target, or
persist an expiring invite token before invoking sendInviteEmail, while
preserving the existing behavior for eligible invitations.
- Line 90: Update the invite-email error logging around the delivery failure
handler to remove input.email from console.error. Log a masked address or
non-sensitive user identifier instead, while preserving the existing error
context.
In `@src/server/mailer.ts`:
- Line 69: Escape the inviter name before interpolating it into the HTML invite
email in the mailer flow. Apply the existing HTML-escaping helper or equivalent
to name, while leaving the surrounding message and URL handling unchanged.
In `@src/tests/mailer.test.ts`:
- Line 39: Organize the tests under sendInviteEmail by adding nested describe
blocks for the delivery, development-mode, and disabled-invite scenarios, while
keeping the existing test cases and assertions unchanged.
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public/locales/en/common.jsonsrc/components/AddExpense/SelectUserOrGroup.tsxsrc/components/group/AddMembers.tsxsrc/server/api/routers/user.tssrc/server/mailer.tssrc/tests/mailer.test.ts
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Mirrors the existing zodError pattern in errorFormatter so callers can branch on a specific failure cause instead of message text.
The user-controlled inviter name was interpolated unescaped into the invite email's HTML body, letting an inviter inject markup into a recipient's inbox.
Add a per-target lastInvitedAt cooldown (atomic claim via a single conditional update, so concurrent requests can't both pass a read-then-write check) so repeated inviteFriend calls can't send unlimited SMTP messages to the same target. Also stop logging the raw recipient email address on send failure; log the user id instead.
…ent-side Both onError handlers now check the server's appErrorCode instead of showing the SMTP-specific toast for any inviteFriend failure. AddMembers.tsx also captures the submitted email once so an in-flight mutation can't be retargeted by a later edit to the input field. Includes a one-line comment-capitalization fix in trpc.ts picked up by the pre-commit lint-staged hook while formatting the batch.
…odule Both onError handlers duplicated the appErrorCode-to-toast-message mapping verbatim; extract it to src/lib/inviteErrors.ts alongside a shared InviteErrorCode constant so the router and both call sites share one source of truth instead of raw string literals.
…hrows - Replace findUnique-then-create with db.user.upsert so two concurrent invites for the same brand-new email can't both miss the lookup and hit the unique-constraint race (a raw, unclassified error that broke the client's error-cause discrimination). - Wrap sendInviteEmail in try/catch so an unexpected throw (e.g. from the Discord-webhook notification path) still surfaces as a clean INVITE_EMAIL_SEND_FAILED instead of an unhandled 500.
…ture convention inviteErrors.ts (the toast-key/error-code mapping) had zero test coverage despite being pure, framework-free logic with no harness dependency, unlike the router/component call sites. Also restructure appError.test.ts and the new file to the project's documented nested describe/scenario convention, and switch two new functions to arrow functions per AGENTS.md's stated preference.
AddMembers.tsx already retries without re-sending the email and adds the participant when inviteFriend fails for a genuine invite-related reason, since the target row exists by the time this router can throw. SelectUserOrGroup.tsx previously only showed a toast and dropped the optimistic placeholder, leaving the participant unadded even though the row was created.
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Inline comments:
In `@src/components/AddExpense/SelectUserOrGroup.tsx`:
- Line 61: Update the send_invite action in SelectUserOrGroup so it passes true
to onAddEmailClick, ensuring the resulting mutation uses sendInviteEmail: true
and delivers the invitation email.
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📒 Files selected for processing (16)
prisma/migrations/20260906080000_add_user_last_invited_at/migration.sqlprisma/schema.prismasrc/components/AddExpense/SelectUserOrGroup.tsxsrc/components/AddExpense/UserInput.tsxsrc/components/group/AddMembers.tsxsrc/lib/inviteErrors.test.tssrc/lib/inviteErrors.tssrc/pages/add.tsxsrc/pages/balances/[friendId].tsxsrc/server/api/appError.test.tssrc/server/api/appError.tssrc/server/api/routers/user.tssrc/server/api/trpc.tssrc/server/mailer.tssrc/tests/addStore.test.tssrc/tests/mailer.test.ts
🚧 Files skipped from review as they are similar to previous changes (3)
- src/tests/mailer.test.ts
- src/components/group/AddMembers.tsx
- src/server/api/routers/user.ts
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Both buttons in SelectUserOrGroup called onAddEmailClick(false), so clicking "Send invite" silently added the friend without ever sending the invite email (CodeRabbit finding on the round-2 push).
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Description
Fixes #722.
When SMTP is misconfigured or unreachable, inviting a friend by email used to fail with no visible error: the invite email send happened fire-and-forget, its result was discarded, and neither of the two UI entry points (adding a member to a group, adding a participant to an expense) handled a mutation error. The only trace was a container log line and, if configured, a Discord webhook post.
This PR makes the failure visible end to end:
sendInviteEmailnow returns whether the send actually succeeded instead of discarding the result.inviteFriendmutation awaits that result and throws when the send fails, including on a retry against an email that already has a (not-yet-verified) user row — previously that path skipped the email attempt entirely and silently reported success, so retrying after a failure looked like it worked when no email was ever sent. Sending is skipped only for a friend who already has a verified account, so inviting an already-registered user doesn't trigger a spurious "you've been invited" email.AddMembers.tsx,SelectUserOrGroup.tsx) show a toast on failure and reconcile the affected UI state (the friend still gets added to the group/participant list even though the email failed; the optimistic placeholder participant is cleaned up instead of getting stranded).Update (review round 2): CodeRabbit's automated review on the first round of commits found 6 real issues, all fixed here, plus several more surfaced by this repo's own follow-up code review before shipping:
escapeHtmlhelper inmailer.tswith regression tests proving a<script>-style name is escaped and a normal name is left untouched.lastInvitedAtcolumn, claimed atomically with a single conditional update (db.user.updateManywith aWHERE lastInvitedAt IS NULL OR < now-60s) so two concurrent requests can't both pass a read-then-write check before either persists.onErrorhandlers previously showed the SMTP-specific message for anyinviteFriendfailure (e.g. an unrelated DB error would look identical to a real SMTP outage). Added a smallAppError/appErrorCodemechanism — mirroring this codebase's existingzodErrorpattern in the tRPCerrorFormatter— so the client can tell a genuine send failure apart from every other cause and only show the SMTP-specific toast (and only retry-without-email) for that one case.AddMembers.tsxre-read the live input-field value inside an in-flight mutation's retry callback, so editing the field mid-request could retarget the retry at the wrong address. Fixed by capturing the submitted email once per click.mailer.test.ts's flat test list into nesteddescribeblocks (delivery / dev-mode / disabled-invites), matching this repo's documented test-structure convention.This round's own review pass (correctness, security, reliability, api-contract, testing, project-standards, data-migration, and adversarial personas) also caught and fixed, before this ever reached CI:
db.user.upsert, which Postgres/Prisma handles atomically.sendInviteEmailcould theoretically throw synchronously (not just resolvefalse) and bypass the clean error path — now wrapped intry/catch.SelectUserOrGroup.tsxwas missing the same error-recoveryAddMembers.tsxalready had (retry without re-sending the email, since the row already exists by the time this mutation can throw) — brought to parity.appErrorCode-to-toast-message mapping was duplicated verbatim in both components; extracted into onesrc/lib/inviteErrors.tsmodule with namedInviteErrorCodeconstants instead of raw string literals.AGENTS.mdconvention.Update (review round 3): CodeRabbit re-reviewed the round-2 push and found one real bug: the "Send invite" button in
SelectUserOrGroup.tsxcalledonAddEmailClick(false)— the same handler as the plain "add to SplitPro" button — so clicking it added the friend but never actually sent an invite email. Added a separatehandleAddEmailClickTruecallback and wired the send-invite button to it. All 6 round-1 findings were re-verified against the current code and confirmed still fixed.Testing:
src/tests/mailer.test.ts(7 cases now, including HTML-escaping),src/server/api/appError.test.ts(new), andsrc/lib/inviteErrors.test.ts(new) cover the core behavior changes. Router-level (tRPC) and component-level tests were not added forinviteFriend's throwing behavior or the twoonErrorhandlers — this repo has no test harness for either surface (nocreateCallerFactoryexport, no component-test setup) and adding one felt out of proportion to this fix; calling that out explicitly rather than skipping it silently.Verified locally:
pnpm test(all suites passing),pnpm build(succeeds, nativetsctype-check clean),npx oxlint --type-aware(no new warnings),pnpm prisma generate(succeeds, schema-only). I could not run a full manual/browser verification or apply the new migration against a real database in my environment — no local Postgres instance is available to boot the dev server or a DB to migrate — so the fix is unverified against a real running app; happy to do that pass if useful before merge.This PR was implemented with AI assistance (Claude Code), run through an autonomous multi-stage pipeline: planning, implementation, a multi-persona automated code review (correctness, project standards, testing, reliability, API-contract, security, data-migration, and adversarial passes, across three review rounds), and applying the review's findings. I reviewed the resulting diff before submitting each round.
Unapplied review findings
Judged out of scope for this fix, or needing maintainer/product judgment rather than a mechanical fix:
src/server/api/routers/user.ts— the rate-limit cooldown is consumed on any send attempt, success or failure, not only on success. Flagged independently by three reviewers across both rounds: a transient SMTP failure blocks a legitimate retry for 60s. The alternative — only consuming the cooldown on a successful send — was considered and rejected, because it would leave a persistently broken SMTP config completely unthrottled (every attempt "fails," so the cooldown would never engage, which is exactly the failure-storm scenario the cooldown exists to prevent). Kept as-is; noting for maintainer visibility in case the tradeoff should be revisited.src/server/api/routers/user.ts— the rate limit is scoped per target email only, not per inviter. An authenticated user can still invite an unbounded number of distinct brand-new addresses without any per-account throttle. A real per-inviter rate limiter (a counter+window, ideally backed by a shared store) is a materially larger feature than "add a cooldown for one target," which is what this round's scope covered. Flagged as a known gap, not built here.src/components/AddExpense/UserInput.tsx— a third consumer ofinviteFriendwith noonErrorhandler at all. Pre-existing, currently inert (this call site never passessendInviteEmail: true), but inconsistent with the other two call sites. Out of scope for this fix.src/components/AddExpense/SelectUserOrGroup.tsx— a rare double-invite race: the optimistic placeholder participant uses a fixed sentinel id (-1); firing two invites back-to-back before the first resolves can let the second invite's placeholder get removed by the first invite's error handler. Pre-existing architectural pattern (shared sentinel id, no in-flight disabling on the invite controls); not introduced by this fix, flagged for future work.Reviewed by an automated multi-persona pass (correctness, project-standards, testing, reliability, api-contract, security, data-migration, adversarial) across three rounds as part of this session's pipeline; the findings above are the ones judged out of scope for this fix or requiring product/maintainer judgment rather than a mechanical fix.
Demo
No UI screenshot — this is a backend error-propagation and hardening fix whose visible effect is "a toast now appears where none did before, invite emails can't be spammed or abused for HTML injection, and the send-invite button now actually sends an email." Manual repro steps from the original issue: configure an invalid/unreachable
EMAIL_SERVER_HOST, invite a user with "send invite email" enabled, and confirm a toast now appears instead of silent success.Checklist
CONTRIBUTING.mdin its entiretySummary by CodeRabbit