metadata-store: add permissions field

pkg/arvo/lib/metadata-json.hoon

@@ -53,6 +53,13 @@
     ?>  ?=([%s *] jon)
     (rash p.jon hex)
   ::
+  ++  permissions
+    %-  su
+    ;~  pose
+      (tag %$)
+      (tag %reader-comments)
+    ==
+  ::
   ++  metadata
     %-  ot
     :~  [%title so]
@@ -63,8 +70,11 @@
         [%module so]
         [%picture so]
         [%preview bo]
+        [%permissions permissions]
     ==
   ::
+  ++  tag   |*(a=@tas (cold a (jest a)))
+  ::
   ++  md-resource
     ^-  $-(json ^md-resource)
     %-  ot
@@ -86,6 +96,7 @@
       [%module s+module.met]
       [%picture s+picture.met]
       [%preview b+preview.met]
+      [%permissions s+`@t`permissions.met]
   ==
 ::
 ++  update-to-json

pkg/arvo/sur/metadata-store.hoon

@@ -18,6 +18,17 @@
 ::
 +$  color  @ux
 +$  url    @t
+::
+::  $permissions: tag identifying variation in permissions
+::
+::    This will be passed to the graph-permissions mark
+::    conversion to allow for custom permissions.
+::
+::    %reader-comments: Allow readers to comment, regardless
+::      of whether they can write.
+::    %$: No variation
+::
++$  permissions  ?(%reader-comments %$)
 +$  metadata
   $:  title=cord
       description=cord
@@ -27,6 +38,7 @@
       module=term
       picture=url
       preview=?
+      =permissions
   ==
 ::
 +$  metadata-action

pkg/interface/src/logic/api/metadata.ts

@@ -22,7 +22,9 @@ export default class MetadataApi extends BaseApi<StoreState> {
           color,
           'date-created': dateCreated,
           creator,
-          'module': moduleName
+          'module': moduleName,
+          preview: false,
+          permissions: ''
         }
       }
     });

pkg/interface/src/types/metadata-update.ts

@@ -62,4 +62,7 @@ export interface Metadata {
   module: string;
   url: string;
   preview: boolean;
+  permissions: Permissions;
 }
+
+export type Permissions = '' | 'reader-comments';