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This pull request adds a "guest" or "view only" role to doccano that enables viewing of project documents and annotations but not creation or modification thereof.
The pull request also fixes a number of additional minor issues related to RBAC:
The
add_new_superuser_to_projects
functions which grants all superusers the admin role on projects wasn't being exercised for admins that were created before the RBAC functionality was introduced. To backport the RBAC functionality to old instances of doccano, the functionality is now being called on server start when we create the default project roles.The
get_current_users_role
function had a hard-coded list of roles. To make it easier to add new roles in the future, the function has been refactored to dynamically look up all roles.Resolves #413