* Fix migration of custom dashboard permissions
Dashboard alert permissions were determined by both its dashboard and
folder scoped permissions, while UA alert rules only have folder
scoped permissions.
This means, when migrating an alert, we'll need to decide if the parent folder
is a correct location for the newly created alert rule so that users, teams,
and org roles have the same access to it as they did in legacy.
To do this, we translate both the folder and dashboard resource
permissions to two sets of SetResourcePermissionCommands. Each of these
encapsulates a mapping of all:
OrgRoles -> Viewer/Editor/Admin
Teams -> Viewer/Editor/Admin
Users -> Viewer/Editor/Admin
When the dashboard permissions (including those inherited from the parent
folder) differ from the parent folder permissions alone, we need to create a
new folder to represent the access-level of the legacy dashboard.
Compromises:
When determining the SetResourcePermissionCommands we only take into account
managed and basic roles. Fixed and custom roles introduce significant complexity
and synchronicity hurdles. Instead, we log a warning they had the potential to
override the newly created folder permissions.
Also, we don't attempt to reconcile datasource permissions that were
not necessary in legacy alerting. Users without access to the necessary
datasources to edit an alert rule will need to obtain said access separate from
the migration.
This PR replaces the vendored models in the migration with their equivalent ngalert models. It also replaces the raw SQL selects and inserts with service calls.
It also fills in some gaps in the testing suite around:
- Migration of alert rules: verifying that the actual data model (queries, conditions) are correct 9a7cfa9
- Secure settings migration: verifying that secure fields remain encrypted for all available notifiers and certain fields migrate from plain text to encrypted secure settings correctly e7d3993
Replacing the checks for custom dashboard ACLs will be replaced in a separate targeted PR as it will be complex enough alone.
