feat(auth): offer native OAuth sign-in on servers like matrix.org #449

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jared merged 1 commits from feat/oauth-detect into lotus 2026-10-24 16:36:37 -04:00
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Lotus CIandClaude Opus 5.5 3c3bb2e41c feat(auth): offer native OAuth sign-in on servers like matrix.org
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The login page looked for an OAuth issuer in .well-known
(m.authentication), which matrix.org no longer publishes, so its users
got the password / SSO compatibility forms. Detect native OAuth the way
the SDK finds the auth server for refresh: load /auth_metadata next to
the login flows. When present:
- Login shows "Continue with <server>" only (as Element does); a legacy
  SSO loginToken coming back from a redirect still completes.
- Register opens the auth server's sign-up page (prompt=create, where
  prompt_values_supported says so) instead of the legacy forms.
Servers without it (Lotus) are unchanged.

Checked against the live servers: matrix.org login and register show
"Continue with matrix.org" and no password form; matrix.lotusguild.org
keeps its password form.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5
2026-10-24 16:15:24 -04:00