v3: use permissions check for enable/disable

lib/travis/api/v3/permissions/repository.rb

@@ -1,5 +1,13 @@
 module Travis::API::V3
   class Permissions::Repository < Permissions::Generic
+    def enable?
+      write?
+    end
+
+    def disable?
+      write?
+    end
+
     def create_request?
       write?
     end

lib/travis/api/v3/services/repository/disable.rb

@@ -3,6 +3,7 @@ module Travis::API::V3
     def run!(activate = false)
       raise LoginRequired unless access_control.logged_in? or access_control.full_access?
       raise NotFound      unless repository = find(:repository)
+      check_access(repository)
 
       admin = access_control.admin_for(repository)
 
@@ -11,5 +12,9 @@ module Travis::API::V3
 
       repository
     end
+
+    def check_access(repository)
+      access_control.permissions(repository).disable!
+    end
   end
 end

lib/travis/api/v3/services/repository/enable.rb

@@ -3,5 +3,9 @@ module Travis::API::V3
     def run!
       super(true)
     end
+
+    def check_access(repository)
+      access_control.permissions(repository).enable!
+    end
   end
 end