feat(access): derive authenticated baseline roles

src/govoplan_access/backend/security/sessions.py

@@ -20,7 +20,7 @@ from govoplan_access.backend.db.models import (
     UserRoleAssignment,
 )
 from govoplan_access.backend.semantic import collect_function_authorization_context, collect_function_roles
-from govoplan_access.backend.permissions.catalog import expand_scopes
+from govoplan_access.backend.permissions.catalog import expand_scopes, role_templates_for_level
 from govoplan_core.security.time import ensure_aware_utc, utc_now
 
 SESSION_RANDOM_BYTES = 32
@@ -183,6 +183,8 @@ def collect_user_roles(session: Session, user: User) -> list[Role]:
         roles_by_id[role.id] = role
     for role in collect_function_roles(session, user):
         roles_by_id[role.id] = role
+    for role in _materialized_default_authenticated_roles(session, user):
+        roles_by_id[role.id] = role
     return list(roles_by_id.values())
 
 
@@ -242,14 +244,24 @@ def collect_user_authorization_context(
         roles_by_id[role.id] = role
     for role in extra_roles:
         roles_by_id[role.id] = role
+    for role in _materialized_default_authenticated_roles(session, user):
+        roles_by_id[role.id] = role
 
     tenant_roles = list(roles_by_id.values())
     system_roles = collect_system_roles(session, account) if include_system and account is not None else []
+    default_slugs = _default_authenticated_slugs()
     scopes = {
         scope
-        for role in [*tenant_roles, *system_roles]
+        for role in tenant_roles
+        if role.slug not in default_slugs
         for scope in (role.permissions or [])
     }
+    scopes.update(
+        scope
+        for role in system_roles
+        for scope in (role.permissions or [])
+    )
+    scopes.update(_default_authenticated_scopes())
     return UserAuthorizationContext(
         tenant_roles=tenant_roles,
         system_roles=system_roles,
@@ -261,15 +273,54 @@ def collect_user_authorization_context(
 
 
 def collect_user_scopes(session: Session, user: User, *, include_system: bool = True) -> list[str]:
-    scopes: set[str] = set()
+    scopes = _default_authenticated_scopes()
+    default_slugs = _default_authenticated_slugs()
     for role in collect_user_roles(session, user):
-        scopes.update(role.permissions or [])
+        if role.slug not in default_slugs:
+            scopes.update(role.permissions or [])
     if include_system and user.account:
         for role in collect_system_roles(session, user.account):
             scopes.update(role.permissions or [])
     return expand_scopes(scopes)
 
 
+def _default_authenticated_slugs() -> set[str]:
+    return {
+        template.slug
+        for template in role_templates_for_level("tenant")
+        if template.default_authenticated
+    }
+
+
+def _default_authenticated_scopes() -> set[str]:
+    return {
+        scope
+        for template in role_templates_for_level("tenant")
+        if template.default_authenticated
+        for scope in template.permissions
+    }
+
+
+def _materialized_default_authenticated_roles(
+    session: Session,
+    user: User,
+) -> list[Role]:
+    """Return the optional database projection without mutating auth reads."""
+
+    default_slugs = _default_authenticated_slugs()
+    if not default_slugs:
+        return []
+    return (
+        session.query(Role)
+        .filter(
+            Role.tenant_id == user.tenant_id,
+            Role.slug.in_(default_slugs),
+        )
+        .order_by(Role.name.asc(), Role.id.asc())
+        .all()
+    )
+
+
 def collect_tenant_memberships(session: Session, account: Account) -> list[tuple[User, Tenant]]:
     return (
         session.query(User, Tenant)