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docs: define the authorization schema lifecycle - #422

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docs: define the authorization schema lifecycle#422
mariajgrimaldi wants to merge 1 commit into
MJG/authz-schema/configurationfrom
MJG/authz-schema/lifecycle

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@mariajgrimaldi

@mariajgrimaldi mariajgrimaldi commented Aug 27, 2026

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Description

The authz schema needs a predictable path from files contributed by applications to the policy stored in the Casbin adapter. That process must preserve dynamic roles and user assignments already in the database, avoid duplicate rows when deployment runs again, and stop safely when definitions conflict or a removed role still has assignments.

This ADR defines the schema lifecycle from discovery through consumption and places compilation during deployment. It also defines storage ownership, idempotent updates, role identifier conflicts, change reporting, removed-role handling, and the administrative fallback for generated rows.

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@openedx-webhooks openedx-webhooks added open-source-contribution PR author is not from Axim or 2U core contributor PR author is a Core Contributor (who may or may not have write access to this repo). labels Aug 27, 2026
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Thanks for the pull request, @mariajgrimaldi!

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@github-project-automation github-project-automation Bot moved this to Needs Triage in Contributions Aug 27, 2026
@mariajgrimaldi mariajgrimaldi linked an issue Aug 27, 2026 that may be closed by this pull request
@mphilbrick211 mphilbrick211 moved this from Needs Triage to Waiting on Author in Contributions Aug 27, 2026

@rodmgwgu rodmgwgu left a comment

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I'm aligned with most of what's defined in this ADR, just added some comments for discussion. Thanks!

Decision
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#. Lifecycle vocabulary

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I see this is not rendering as a number in the readthedocs preview.


Static and dynamic roles share the same set of names, so neither kind can reuse a name that already exists. The dynamic role API rejects a name used by a static role, and deployment stops when a new static role conflicts with an existing dynamic role.

For example, an administrator cannot create a dynamic ``course_observer`` role when an application already defines a static role with that name. If the dynamic role existed first, a deployment that introduces the static role stops and reports both the contributing package and the conflicting database record, leaving both definitions unchanged.

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Should we define a naming convention for dynamic roles? like custom_<user defined name>, to avoid name clashes? (although this convention wouldn't go in this specific ADR).


Before writing to the database, the compiler reports the categories, permissions, roles, and role-permission relationships that will change, including changes caused by a higher-priority contribution. Validation errors and failed tests stop deployment before the database changes.

Removing a static role also removes its role-permission relationships. If users still have that role, deployment stops and reports the assignments that must be removed or moved to another role. For example, ``course_observer`` cannot be removed while Alice still has that role.

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How will the system detect a removed role or role-permission relationship? will it do a diff between the newly rendered schema vs the one existing in the DB? should we specify this here?


Before writing to the database, the compiler reports the categories, permissions, roles, and role-permission relationships that will change, including changes caused by a higher-priority contribution. Validation errors and failed tests stop deployment before the database changes.

Removing a static role also removes its role-permission relationships. If users still have that role, deployment stops and reports the assignments that must be removed or moved to another role. For example, ``course_observer`` cannot be removed while Alice still has that role.

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Has a flag or something similar been considered to force the deletion, so we don't have to manually delete the assignments?

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1. Role and permission definition ADR

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