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feat(auth): signup attribution + OAuth user_signed_up event - #4024

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PierreBrisorgueil merged 3 commits into
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feat/4003-signup-attribution
Aug 19, 2026
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feat(auth): signup attribution + OAuth user_signed_up event#4024
PierreBrisorgueil merged 3 commits into
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feat/4003-signup-attribution

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@PierreBrisorgueil

@PierreBrisorgueil PierreBrisorgueil commented Aug 16, 2026

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Summary

  • What changed:
    • Adds an optional, strict first-touch attribution object (referrer, landingPath, utm_*) to the signup payload, validated via Zod and persisted as a nested subdocument on the user model — only when the analytics client is actually configured (client !== null), otherwise stripped before create so no dead data is ever written.
    • Flattens the persisted attribution into snake_case properties (utm_source, landing_path, …) and attaches them to the backend user_signed_up capture event on local signup.
    • Brings the OAuth create-branch up to parity with local signup: fires identify + user_signed_up capture on new-account creation only (never on the existing/linked-user branches). OAuth carries no attribution payload (redirect has no body), so no attribution properties are attached there.
    • Excludes attribution from the profile-update write surface (UserUpdate) via explicit schema .omit(), in addition to the config whitelist — defense-in-depth so a client can never overwrite its own first-touch attribution after signup.
  • Why: OAuth signups previously emitted no backend signup event, and no server-side acquisition origin was persisted for any signup path.
  • Related issues: Closes ✨ Persist first-touch attribution at signup + emit signup analytics on OAuth path #4003

Scope

  • Module(s) impacted: auth (controller), users (schema, mongoose model)
  • Cross-module impact: none
  • Risk level: low

Validation

  • npm run lint
  • npm test
  • Manual checks done (if applicable)

Guardrails check

  • No secrets or credentials introduced (.env*, secrets/**, keys, tokens)
  • No risky rename/move of core stack paths
  • Changes remain merge-friendly for downstream projects
  • Tests added or updated when behavior changed

Notes for reviewers

  • Security considerations: attribution is a client-provided field but is Zod-validated with .strict() (unknown keys rejected with 422), length-capped, and trimmed on every field; it is stripped entirely before create when the analytics client is not configured, so no unbounded/unused data is ever persisted.
  • Mergeability considerations: none — additive schema field, no migration required (optional, absent on existing documents).
  • Follow-up tasks (optional): none

Already reviewed

  • Kimi pre-push gate: passed (2 iterations)
  • Security pass: no findings
  • Full unit + integration suites: green

Summary by CodeRabbit

  • New Features

    • Added signup attribution tracking for referrer, landing page, and campaign details.
    • Attribution is saved with new accounts and included in signup analytics when analytics is configured.
    • Added signup analytics for newly created OAuth accounts, including invitation details.
    • Existing accounts and linked identities are not reported as new signups.
  • Bug Fixes

    • Prevented attribution data from being stored or reported when analytics is unavailable.
    • Added validation, trimming, length limits, and unknown-field rejection for attribution data.
    • Prevented attribution from being changed through account updates.

- accept an optional strict attribution object (referrer, landingPath,
  utm*) on the signup body, validated by Zod and persisted on the user
  only when the analytics client is actually configured (enabled + key)
- flatten attribution as snake_case properties on user_signed_up
- fire identify + user_signed_up on the OAuth create path (parity with
  local signup); resolve branches never emit
- attribution is excluded from the profile-update write surface

Claude-Session: https://claude.ai/code/session_015AXhHayqcLntuU3AbX7No8
Covers the full route -> Zod -> controller -> Mongo path: persisted
subdoc + flattened user_signed_up props when analytics is configured,
no persistence when not, 422 on unknown attribution key.

Claude-Session: https://claude.ai/code/session_015AXhHayqcLntuU3AbX7No8
@PierreBrisorgueil PierreBrisorgueil added the Feat A new feature label Aug 16, 2026
@PierreBrisorgueil PierreBrisorgueil self-assigned this Aug 16, 2026
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  • modules/auth/tests/auth.signup.attribution.integration.tests.js

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Walkthrough

Signup attribution now has strict schemas and persistence support. Local signups gate attribution on analytics configuration and flatten fields for events. New OAuth accounts emit signup analytics, while existing accounts do not.

Changes

Signup attribution and analytics

Layer / File(s) Summary
Attribution contracts and persistence
modules/users/models/users.schema.js, modules/users/models/users.model.mongoose.js, modules/users/tests/user.unit.tests.js
Added strict, trimmed, length-limited attribution fields. Added attribution to signup and user schemas, excluded it from updates, and persisted it in the user model.
Local signup attribution flow
modules/auth/controllers/auth.controller.js, modules/auth/tests/auth.signup.attribution.*, modules/auth/tests/auth.signup.attribution.integration.tests.js, lib/services/tests/analytics.identify.unit.tests.js, modules/auth/tests/auth.signup.inviteHonored.unit.tests.js, modules/auth/tests/auth.silent.catch.unit.tests.js
Local signup now preserves attribution only when analytics is configured and adds defined fields to user_signed_up properties. Tests cover configured, unconfigured, partial, missing, and invalid attribution.
OAuth signup analytics
modules/auth/controllers/auth.controller.js, modules/auth/tests/auth.oauth.signup.analytics.unit.tests.js
New OAuth users now trigger $identify and user_signed_up analytics with provider and invitation metadata. Existing and linked users do not trigger signup analytics.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🔵 Low · up to 51c50

The PR adds signup attribution persistence and OAuth signup analytics while protecting first-touch data from profile updates; the remaining merge-readiness risk is limited to a repository-required JSDoc contract on a new async test helper, which does not affect production behavior but should be addressed or explicitly accepted by the owner.

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Title check ✅ Passed The title clearly summarizes the primary changes: signup attribution and OAuth signup analytics.
Description check ✅ Passed The description covers the required summary, scope, validation, guardrails, risks, and reviewer notes.
Linked Issues check ✅ Passed The changes satisfy issue #4003 by adding validated attribution, conditional persistence, local analytics properties, and OAuth signup events.
Out of Scope Changes check ✅ Passed The code and test changes remain focused on signup attribution, OAuth analytics parity, schema protection, and related mocks.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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  • Create stacked PR
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🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch feat/4003-signup-attribution

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codecov Bot commented Aug 16, 2026

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.02%. Comparing base (5f4b1d5) to head (51c50a2).

Additional details and impacted files
@@            Coverage Diff             @@
##           master    #4024      +/-   ##
==========================================
+ Coverage   94.01%   94.02%   +0.01%     
==========================================
  Files         170      170              
  Lines        5810     5824      +14     
  Branches     1859     1864       +5     
==========================================
+ Hits         5462     5476      +14     
  Misses        285      285              
  Partials       63       63              
Flag Coverage Δ
integration 62.34% <100.00%> (+0.09%) ⬆️
unit 77.50% <100.00%> (+0.65%) ⬆️

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@PierreBrisorgueil
PierreBrisorgueil marked this pull request as ready for review August 16, 2026 09:55

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Actionable comments posted: 1

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Inline comments:
In `@modules/auth/tests/auth.signup.attribution.integration.tests.js`:
- Around line 50-57: Add a JSDoc comment immediately above the named async
helper cleanupUsers, including a one-line description and an `@returns`
{Promise<void>} annotation; it has no parameters, so no `@param` tag is needed.
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📒 Files selected for processing (10)
  • lib/services/tests/analytics.identify.unit.tests.js
  • modules/auth/controllers/auth.controller.js
  • modules/auth/tests/auth.oauth.signup.analytics.unit.tests.js
  • modules/auth/tests/auth.signup.attribution.integration.tests.js
  • modules/auth/tests/auth.signup.attribution.unit.tests.js
  • modules/auth/tests/auth.signup.inviteHonored.unit.tests.js
  • modules/auth/tests/auth.silent.catch.unit.tests.js
  • modules/users/models/users.model.mongoose.js
  • modules/users/models/users.schema.js
  • modules/users/tests/user.unit.tests.js

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Comment thread modules/auth/tests/auth.signup.attribution.integration.tests.js
Addresses CodeRabbit review comment on PR #4024 — matches the
existing convention in sibling attribution/organization integration
suites, which already JSDoc their cleanup helpers.

Claude-Session: https://claude.ai/code/session_015AXhHayqcLntuU3AbX7No8
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@PierreBrisorgueil
PierreBrisorgueil merged commit 133d6df into master Aug 19, 2026
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@PierreBrisorgueil
PierreBrisorgueil deleted the feat/4003-signup-attribution branch August 19, 2026 15:28
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✨ Persist first-touch attribution at signup + emit signup analytics on OAuth path

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