Enable domain reset (to remove a delegation).

src/App/Container.purs

@@ -601,6 +601,9 @@ act_on_page_event page_event = case page_event of
     PageZone.AskSaveDelegation domain nameserver1 nameserver2 -> do
       message <- H.liftEffect $ DNSManager.serialize $ DNSManager.MkDelegateDomain { domain, nameserver1, nameserver2 }
       H.tell _ws_dns unit (WS.ToSend message)
+    PageZone.AskResetDelegation domain -> do
+      message <- H.liftEffect $ DNSManager.serialize $ DNSManager.MkResetDelegation { domain }
+      H.tell _ws_dns unit (WS.ToSend message)
     PageZone.AskAddRR domain rr -> do
       message <- H.liftEffect $ DNSManager.serialize $ DNSManager.MkAddRR { domain, rr }
       H.tell _ws_dns unit (WS.ToSend message)

src/App/Page/Zone.purs

@@ -66,6 +66,7 @@ data Output
   | AskDeleteRR String Int
   | AskSaveRR String RR.ResourceRecord
   | AskSaveDelegation String String String
+  | AskResetDelegation String
   | AskAddRR String RR.ResourceRecord
   | AskGetZone String
 
@@ -109,6 +110,9 @@ data Action
   -- | Update Delegation modal.
   | UpdateDelegationModal Delegation
 
+  -- | Reset Delegation modal.
+  | DisplayResetDelegationModal
+
   -- | Create modal (a form) for a resource record to update.
   | CreateUpdateRRModal RR.RRId
 
@@ -133,6 +137,9 @@ data Action
   -- | Save the delegation.
   | SaveDelegation
 
+  -- | Reset the delegation.
+  | ResetDelegation
+
   -- | Validate a new resource record before adding it.
   | ValidateRR RR.AcceptedRRTypes
 
@@ -255,12 +262,16 @@ render state
       = Modal.delegation_modal state._domain state._delegation_form
           UpdateDelegationForm ValidateDelegation CancelModal
 
+    reset_delegation_modal
+      = Modal.reset_delegation_modal state._domain ResetDelegation CancelModal
+
     render_zone =
       case state.rr_modal of
-          RemoveRRModal rr_id -> Modal.modal_rr_delete rr_id RemoveRR CancelModal
-          NewRRModal _        -> call_to_current_rr_modal
-          UpdateRRModal       -> call_to_current_rr_modal
-          DelegationModal     -> delegation_modal
+          RemoveRRModal rr_id  -> Modal.modal_rr_delete rr_id RemoveRR CancelModal
+          NewRRModal _         -> call_to_current_rr_modal
+          UpdateRRModal        -> call_to_current_rr_modal
+          DelegationModal      -> delegation_modal
+          ResetDelegationModal -> reset_delegation_modal
           NoModal -> HH.div_ $
             [ Web.level [ Web.btn_ [C.is_large, C.is_info]  "Back to the domain list" ReturnToDomainList
                         , Web.h1 state._domain
@@ -277,6 +288,9 @@ render state
       , Web.level [
             Web.btn "Edit the name servers" (UpdateDelegationModal delegation)
           ] []
+      , Web.level [
+            Web.btn "Reset this domain, forget about delegation" DisplayResetDelegationModal
+          ] []
       ]
     render_zone_records _ =
       [ Table.resource_records (sorted state._resources) CreateUpdateRRModal DeleteRRModal NewToken
@@ -346,6 +360,10 @@ handleAction = case _ of
   UpdateDelegationModal delegation -> do
     H.modify_ _ { rr_modal = DelegationModal, _delegation_form = Delegation.mkUpdateDelegationForm delegation }
 
+  -- | Delegation modal presents a simple form with two entries (chosen nameservers).
+  DisplayResetDelegationModal -> do
+    H.modify_ _ { rr_modal = ResetDelegationModal }
+
   -- | Initialize the Zone component: ask for the domain zone to `dnsmanagerd`.
   Initialize -> do
     { _domain } <- H.get
@@ -483,6 +501,13 @@ handleAction = case _ of
     H.raise $ AskSaveDelegation state._domain df.nameserver1 df.nameserver2
     H.modify_ _ { rr_modal = NoModal }
 
+  -- | Save the delegation of the domain.
+  ResetDelegation -> do
+    state <- H.get
+    H.raise $ Log $ SystemLog $ "Reset the delegation for domain '" <> state._domain <> "'"
+    H.raise $ AskResetDelegation state._domain
+    H.modify_ _ { rr_modal = NoModal }
+
   NewToken rr_id -> do
     { _domain } <- H.get
     H.raise $ Log $ SystemLog $ "Ask a token for rrid " <> show rr_id

src/App/Templates/Modal.purs

@@ -47,6 +47,28 @@ modal_rr_delete rr_id action_remove_rr action_cancel_modal = Web.modal "Deleting
 zip_nullable :: forall a. Array a -> Array String -> Array (Tuple a String)
 zip_nullable txt raw = A.zip txt ([""] <> raw)
 
+type ActionResetDelegation :: forall i. i -> i
+type ActionResetDelegation i = i
+reset_delegation_modal :: forall w i. Domain -> ActionResetDelegation i -> ActionCancelModal i -> HH.HTML w i
+reset_delegation_modal selected_domain action_reset_delegation action_cancel_modal =
+    Web.modal modal_title modal_content modal_foot
+    where
+    modal_title = "Reset delegation for " <> selected_domain
+    modal_content :: Array (HH.HTML w i)
+    modal_content =
+      [ HH.div [HP.classes [C.notification, C.is_warning]]
+          [ Web.p "⚠️​  You are about to remove delegation for this domain."
+          , Web.p """
+                  The domain will be reset to the default values from a template, you'll be able to modify the domain as a new domain.
+                  """
+          ]
+      ]
+    modal_foot :: Array (HH.HTML w i)
+    modal_foot =
+        [ Web.info_btn "Reset this domain" action_reset_delegation
+        , Web.cancel_button action_cancel_modal
+        ]
+
 type ActionValidate :: forall i. i -> i
 type ActionValidate i = i
 type ActionUpdateDelegationForm  i = (Delegation.Field -> i)
@@ -398,9 +420,10 @@ current_rr_modal selected_domain form rr_modal
     template content foot_ = Web.modal title content foot
       where
       title = case rr_modal of
-        NoModal             -> "Error: no modal should be displayed"
-        DelegationModal     -> "Error: the delegation modal should be displayed"
-        NewRRModal t_       -> "New " <> show t_ <> " resource record"
-        UpdateRRModal       -> "Update " <> form._rr.rrtype <> " Resource Record"
-        RemoveRRModal rr_id -> "Error: should display removal modal instead (for resource record " <> show rr_id <> ")"
+        NoModal              -> "Error: no modal should be displayed"
+        DelegationModal      -> "Error: the delegation modal should be displayed"
+        ResetDelegationModal -> "Error: the reset delegation modal should be displayed"
+        NewRRModal t_        -> "New " <> show t_ <> " resource record"
+        UpdateRRModal        -> "Update " <> form._rr.rrtype <> " Resource Record"
+        RemoveRRModal rr_id  -> "Error: should display removal modal instead (for resource record " <> show rr_id <> ")"
       foot = foot_ <> [Web.cancel_button action_cancel_modal]

src/App/Type/RRModal.purs

@@ -14,3 +14,4 @@ data RRModal
   | UpdateRRModal
   | RemoveRRModal RR.RRId
   | DelegationModal
+  | ResetDelegationModal