User mailbox access hooks

app/Mailbox.php

@@ -492,6 +492,8 @@ class Mailbox extends Model
         // Sort by full name
         $users = User::sortUsers($users);
 
+        $users = \Eventy::filter('mailbox.users_assignable', $users, $this, $cache);
+
         return $users;
     }
 
@@ -522,7 +524,10 @@ class Mailbox extends Model
                 $user = User::find($user_id);
             }
         }
-        if ($user && $user->isAdmin()) {
+        $filter = \Eventy::filter('mailbox.user_has_access', -1, $this, $user);
+        if ($filter != -1) {
+            return (bool)$filter;
+        } elseif ($user && $user->isAdmin()) {
             return true;
         } else {
             return (bool) $this->users()->where('users.id', $user_id)->count();

app/User.php

@@ -209,7 +209,7 @@ class User extends Authenticatable
      */
     public function getFullName()
     {
-        return $this->first_name.' '.$this->last_name;
+        return \Eventy::filter('user.full_name', $this->first_name.' '.$this->last_name, $this);
     }
 
     /**