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feat(auth): add Google OAuth login

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Support Google login that links to existing accounts by email.
When a user who registered via email OTP signs in with Google using
the same email, they are linked to the same account.

Backend:
- Add POST /auth/google endpoint that exchanges Google auth code for
  tokens, fetches user profile, and calls findOrCreateUser()
- Updates user name and avatar from Google profile on first Google login

Frontend:
- Add "Continue with Google" button on login page (shown when
  NEXT_PUBLIC_GOOGLE_CLIENT_ID is configured)
- Add /auth/callback page to handle Google OAuth redirect
- Add loginWithGoogle to auth store and API client
This commit is contained in:
Jiang Bohan 2026-04-07 15:25:26 +08:00
parent 2f63714dba
commit 14fe8e9df9
7 changed files with 324 additions and 1 deletions
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1
.env.example
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@ -29,6 +29,7 @@ RESEND_FROM_EMAIL=noreply@multica.ai
GOOGLE_CLIENT_ID=
GOOGLE_CLIENT_SECRET=
GOOGLE_REDIRECT_URI=http://localhost:3000/auth/callback
NEXT_PUBLIC_GOOGLE_CLIENT_ID=
# S3 / CloudFront
S3_BUCKET=