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[PR #8463] feat(sso): add additionalData support to SSO sign in #7993

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opened 2026-03-13 13:56:03 -05:00 by GiteaMirror · 0 comments
GiteaMirror commented 2026-03-13 13:56:03 -05:00
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📋 Pull Request Information

Original PR: https://github.com/better-auth/better-auth/pull/8463
Author: @rae-fcm
Created: 3/6/2026
Status: 🔄 Open

Base: canary ← Head: feat/sso-additional-data-pipeline

📝 Commits (10+)

  • e63b3dc feat(sso): pipe additional data through sso authentication flow
  • cbc44ee test(sso): add test cases for additionalData pipeline
  • 764f6dd docs: update sso docs to include additionalState parameter
  • 2711cfe Merge branch 'canary' into feat/sso-additional-data-pipeline
  • a0e3ddb feat(sso): access sso additionalData via hooks
  • 5aa3c06 chore: format & lint
  • 9614e36 Merge branch 'canary' into feat/sso-additional-data-pipeline
  • 06ef694 chore: add test cases for preventing stale user after provisioning in hooks
  • bc495a5 Merge branch 'canary' into feat/sso-additional-data-pipeline
  • 3f1cbd8 fix: correct type for sso state, parallel with OAuth state

📊 Changes

8 files changed (+775 additions, -14 deletions)

View changed files

📝 docs/content/docs/plugins/sso.mdx (+49 -1)
📝 packages/sso/src/index.ts (+1 -0)
📝 packages/sso/src/oidc.test.ts (+282 -0)
📝 packages/sso/src/routes/sso.ts (+47 -11)
📝 packages/sso/src/saml-state.ts (+1 -1)
📝 packages/sso/src/saml.test.ts (+375 -1)
➕ packages/sso/src/sso-state.ts (+16 -0)
📝 packages/sso/src/types.ts (+4 -0)

📄 Description

closes #8450

RelayState (SAML) and the OAuth state parameter (OIDC) are already used internally to carry callback URLs and other state parameters through the IdP back to the SP round-trip. additionalData exposes the same mechanism to consumers in its most general sense, allowing arbitrary key/value data to be sent with the sign-in request, echoed back by the IdP, and delivered to the provisionUser callback and sso callback hooks without any extra round-trips or storage.

Summary by cubic

Adds client-supplied additionalData to SSO sign-in and carries it through OIDC and SAML (including ACS) to provisionUser. Exposes request-scoped SSO state to hooks via getSSOState (returns null outside SSO callbacks) and re-fetches the user after provisioning to avoid stale data in org provisioning.

  • New Features

    • signIn.sso and server signInSSO accept additionalData and persist it via OAuth state and SAML RelayState (including ACS), delivering it to provisionUser.
    • getSSOState returns the full request SSO state (e.g., callbackURL, expiresAt, codeVerifier) plus additionalData for server hooks during OIDC and SAML callbacks.

  • Bug Fixes

    • Re-fetch the user after provisionUser and pass the updated user to org provisioning hooks to prevent stale role assignment (OIDC and SAML, including ACS).

Written for commit 053dc90627. Summary will update on new commits.

🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.

## 📋 Pull Request Information **Original PR:** https://github.com/better-auth/better-auth/pull/8463 **Author:** [@rae-fcm](https://github.com/rae-fcm) **Created:** 3/6/2026 **Status:** 🔄 Open **Base:** `canary` ← **Head:** `feat/sso-additional-data-pipeline` --- ### 📝 Commits (10+) - [`e63b3dc`](https://github.com/better-auth/better-auth/commit/e63b3dc8f5bca2257d25b8635e01a122583b0b29) feat(sso): pipe additional data through sso authentication flow - [`cbc44ee`](https://github.com/better-auth/better-auth/commit/cbc44eeb1b354b3ccb95f6d24660d4cb4e5f7c35) test(sso): add test cases for additionalData pipeline - [`764f6dd`](https://github.com/better-auth/better-auth/commit/764f6dd169d9319d9641d8571ca4030b0c512734) docs: update sso docs to include additionalState parameter - [`2711cfe`](https://github.com/better-auth/better-auth/commit/2711cfe0b9d5239bf9c2c95f27b90b2384976fe5) Merge branch 'canary' into feat/sso-additional-data-pipeline - [`a0e3ddb`](https://github.com/better-auth/better-auth/commit/a0e3ddb59bfc48f281120832f45de15b303bc3cb) feat(sso): access sso additionalData via hooks - [`5aa3c06`](https://github.com/better-auth/better-auth/commit/5aa3c06e88ee1ad956e75bf4a24626c5577a4705) chore: format & lint - [`9614e36`](https://github.com/better-auth/better-auth/commit/9614e365cc3bedd3e467b204196706806fe1b660) Merge branch 'canary' into feat/sso-additional-data-pipeline - [`06ef694`](https://github.com/better-auth/better-auth/commit/06ef6945867cb980473be4a06d9c88cd0fe124f4) chore: add test cases for preventing stale user after provisioning in hooks - [`bc495a5`](https://github.com/better-auth/better-auth/commit/bc495a51f11531444e7beb8de56ccfbd1c2dbb40) Merge branch 'canary' into feat/sso-additional-data-pipeline - [`3f1cbd8`](https://github.com/better-auth/better-auth/commit/3f1cbd84ba347445c8ab7453c47b08bc5e860eaa) fix: correct type for sso state, parallel with OAuth state ### 📊 Changes **8 files changed** (+775 additions, -14 deletions) <details> <summary>View changed files</summary> 📝 `docs/content/docs/plugins/sso.mdx` (+49 -1) 📝 `packages/sso/src/index.ts` (+1 -0) 📝 `packages/sso/src/oidc.test.ts` (+282 -0) 📝 `packages/sso/src/routes/sso.ts` (+47 -11) 📝 `packages/sso/src/saml-state.ts` (+1 -1) 📝 `packages/sso/src/saml.test.ts` (+375 -1) ➕ `packages/sso/src/sso-state.ts` (+16 -0) 📝 `packages/sso/src/types.ts` (+4 -0) </details> ### 📄 Description closes #8450 RelayState (SAML) and the OAuth state parameter (OIDC) are already used internally to carry callback URLs and other state parameters through the IdP back to the SP round-trip. `additionalData` exposes the same mechanism to consumers in its most general sense, allowing arbitrary key/value data to be sent with the sign-in request, echoed back by the IdP, and delivered to the provisionUser callback and sso callback hooks without any extra round-trips or storage. <!-- This is an auto-generated description by cubic. --> --- ## Summary by cubic Adds client-supplied `additionalData` to SSO sign-in and carries it through OIDC and SAML (including ACS) to `provisionUser`. Exposes request-scoped SSO state to hooks via `getSSOState` (returns `null` outside SSO callbacks) and re-fetches the user after provisioning to avoid stale data in org provisioning. - **New Features** - `signIn.sso` and server `signInSSO` accept `additionalData` and persist it via OAuth state and SAML RelayState (including ACS), delivering it to `provisionUser`. - `getSSOState` returns the full request SSO state (e.g., `callbackURL`, `expiresAt`, `codeVerifier`) plus `additionalData` for server hooks during OIDC and SAML callbacks. - **Bug Fixes** - Re-fetch the user after `provisionUser` and pass the updated user to org provisioning hooks to prevent stale role assignment (OIDC and SAML, including ACS). <sup>Written for commit 053dc906279f24a5a90020a10981e9ae3b5a731f. Summary will update on new commits.</sup> <!-- End of auto-generated description by cubic. --> --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>
GiteaMirror added the pull-request label 2026-03-13 13:56:03 -05:00
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Reference: github-starred/better-auth#7993
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