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Save existing refresh_token in store if no new refresh_token is returned #483

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@fredericbarthelet fredericbarthelet commented May 12, 2025

As described in OAuth 2.1 specs on refresh token response, server MAY return a new refresh_token. In case it doesn't, current implementation discards initially obtained refresh_token even if it is still valid.

Motivation and Context

Ensure refresh_token can be used more than once to generate a new access_token

How Has This Been Tested?

Added a test case to auth.test.ts to simulate the case where no refresh_token is returned in response from /token request with refresh_token grant.

Breaking Changes

None

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Additional context

As described in https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-12#name-refresh-token-response,
server MAY return a new refresh_token. In case it doesn't, current implementation discard initial refresh
token if it was still valid.
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