update: Supabase new OIDC integration

[tamalchowdhury]

This PR replaces the old minted JWT authentication to Supabase native OIDC integration. Now Kinde works as an IdP for Supabase; SB handles the session, and users are stored in the database.

Summary by CodeRabbit

• Documentation
  • Replaced the Kinde–Supabase integration guide with a streamlined Quickstart for Next.js.
  • Added setup instructions for Kinde as a custom OAuth provider, including scopes, callback URLs, and auto-discovery.
  • Added examples for login, registration, logout, OAuth callbacks, session handling, and protected-route redirects.
  • Included a verification checklist for confirming authentication in both dashboards.

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 6bb88794-2e8b-4607-b782-bd58720e0d5a

📥 Commits

Reviewing files that changed from the base of the PR and between da57d6b and 317b1db.

📒 Files selected for processing (1)

• src/content/docs/integrate/third-party-tools/kinde-supabase.mdx

Walkthrough

The Kinde–Supabase integration guide was rewritten as a Quickstart covering custom OAuth configuration, Next.js authentication flows, logout handling, redirects, and verification steps.

Changes

Kinde–Supabase OAuth Quickstart

Layer / File(s)	Summary
Provider setup and guide metadata src/content/docs/integrate/third-party-tools/kinde-supabase.mdx	Updates document metadata and explains Kinde application creation, Supabase custom provider configuration, scopes, and callback URLs.
Next.js OAuth flow and validation src/content/docs/integrate/third-party-tools/kinde-supabase.mdx	Documents login and registration buttons, callback session exchange, logout redirection, protected-route redirects, and checks for users in Kinde and Supabase.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Suggested reviewers: onderay

Poem

I’m a bunny hopping through OAuth bright,
Kinde sends the user into Supabase light.
Next.js catches the code with care,
Sessions and redirects bloom in the air.
Login, logout—everything’s neat,
Two dashboards make the trail complete!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: documenting Supabase's new OIDC integration with Kinde.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch tamal/update/supabase-new-oidc-integration

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Deploying kinde-docs-preview with    Cloudflare Pages

Latest commit:	317b1db
Status:	✅  Deploy successful!
Preview URL:	https://e6ba8e15.kinde-docs-preview.pages.dev
Branch Preview URL:	https://tamal-update-supabase-new-oi.kinde-docs-preview.pages.dev

View logs

[coderabbitai]

Actionable comments posted: 4

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/content/docs/integrate/third-party-tools/kinde-supabase.mdx`:
- Around line 100-114: Update the Kinde-Supabase integration guide’s setup steps
to instruct users to add /auth/callback to Supabase Authentication > URL
Configuration, including http://localhost:3000/auth/callback and the
corresponding production URL.
- Around line 188-198: Validate the next parameter in the GET callback before
using it in NextResponse.redirect, allowing only same-origin relative paths and
rejecting values such as `@attacker.example` or absolute URLs. Preserve the
existing /protected fallback and redirect valid paths using the existing origin.
- Around line 82-84: Update the Kinde setup instructions around the application
Details page to also add the local and production app origins to the Allowed
logout redirect URLs field, alongside the existing callback URL configuration,
so logout returns correctly to the app.
- Around line 77-79: Update the Aside in the Kinde/Supabase integration
documentation to instruct users to request the Kinde provider refresh token with
the `offline` scope instead of `offline_access`, and explicitly distinguish it
from Supabase’s session refresh token.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 046e3f06-c067-461d-88a2-575eb3017265

📥 Commits

Reviewing files that changed from the base of the PR and between 886d14b and da57d6b.

📒 Files selected for processing (1)

• src/content/docs/integrate/third-party-tools/kinde-supabase.mdx