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When Canvas rejects a refresh token with invalid_grant, delete the stored token and restart the OAuth flow instead of rendering a 403 on every launch. The OAuth callback now uses update_or_create so re-authorizing can't collide with an existing row. Also registers CanvasOAuth2Token in the Django admin for viewing and deleting tokens. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NxgCeX8Y1zSgrACqveBrBm
It was already in .gitignore but had been committed before that rule. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NxgCeX8Y1zSgrACqveBrBm
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Problem
Some users (tokens issued 2026-09-08) get
refresh_token request failed to get a token: {"error":"invalid_grant","error_description":"refresh_token not found"}at/oauth/initiate. Canvas no longer recognizes their refresh token, and because the dead row is never removed, every launch fails the same way.Not caused by discarding rotated refresh tokens — Canvas doesn't rotate them ("the same refresh token can be used multiple times"), and the affected tokens were never successfully refreshed even once.
Changes
canvas.py: raiseInvalidGrantError(subclass ofInvalidOAuthReturnError) when Canvas responds 400/401 withinvalid_grant.oauth.py: onInvalidGrantErrorduring refresh, delete the token and raiseMissingTokenErrorso the middleware restarts the OAuth flow. Other failures (e.g. Canvas 5xx) still render the error page and keep the token.oauth.py: callback usesupdate_or_createso re-authorizing can't violate the one-to-one onuser.admin.py: registerCanvasOAuth2Token(list/search/delete; token values hidden; no add).Testing
Not yet exercised against Canvas. To verify: delete an affected user's token via admin (or let the new path do it) and relaunch — they should land on the Canvas authorize screen.
🤖 Generated with Claude Code
https://claude.ai/code/session_01NxgCeX8Y1zSgrACqveBrBm