Reuse SecretLink and AccessGrant generators

* this should help with the elimination of duplicates

invenio_config_tuw/permissions/policies.py

@@ -53,18 +53,25 @@ def IfRestrictedAllowed(then_):
     return IfConfig("RDM_ALLOW_RESTRICTED_RECORDS", then_=then_, else_=[])
 
 
+edit_link = SecretLinks("edit")
+view_link = SecretLinks("view")
+preview_link = SecretLinks("preview")
 secret_links = {
     "manage": [],  # "manage" permissions can't be shared with links
-    "edit": [SecretLinks("edit")],
-    "view": [SecretLinks("edit"), SecretLinks("view")],
-    "preview": [SecretLinks("edit"), SecretLinks("preview")],
+    "edit": [edit_link],
+    "view": [edit_link, view_link],
+    "preview": [edit_link, preview_link],
 }
 
+manage_grant = AccessGrant("manage")
+edit_grant = AccessGrant("edit")
+view_grant = AccessGrant("view")
+preview_grant = AccessGrant("preview")
 access_grants = {
-    "manage": [AccessGrant("manage")],
-    "edit": [AccessGrant("manage"), AccessGrant("edit")],
-    "view": [AccessGrant("manage"), AccessGrant("edit"), AccessGrant("view")],
-    "preview": [AccessGrant("manage"), AccessGrant("edit"), AccessGrant("preview")],
+    "manage": [manage_grant],
+    "edit": [manage_grant, edit_grant],
+    "view": [manage_grant, edit_grant, view_grant],
+    "preview": [manage_grant, edit_grant, preview_grant],
 }
 
 shared_access = {