feat: Allow viewers to be upgraded to editors on individual collections (#4023)

* Improve types

* More types, fix default permission for viewers added to collection

* fix change of default role for CollectionGroup

* Restore policy

* test

* tests

server/models/User.ts

@@ -22,6 +22,7 @@ import {
   AllowNull,
 } from "sequelize-typescript";
 import { languages } from "@shared/i18n";
+import { CollectionPermission } from "@shared/types";
 import { stringToColor } from "@shared/utils/color";
 import env from "@server/env";
 import { ValidationError } from "../errors";
@@ -219,6 +220,12 @@ class User extends ParanoidModel {
     return stringToColor(this.id);
   }
 
+  get defaultCollectionPermission(): CollectionPermission {
+    return this.isViewer
+      ? CollectionPermission.Read
+      : CollectionPermission.ReadWrite;
+  }
+
   /**
    * Returns a code that can be used to delete this user account. The code will
    * be rotated when the user signs out.
@@ -298,8 +305,8 @@ class User extends ParanoidModel {
     return collectionStubs
       .filter(
         (c) =>
-          c.permission === "read" ||
-          c.permission === "read_write" ||
+          c.permission === CollectionPermission.Read ||
+          c.permission === CollectionPermission.ReadWrite ||
           c.memberships.length > 0 ||
           c.collectionGroupMemberships.length > 0
       )