Package handlers implements build-in action callbacks.

CanLogin check if the username/email and password matches.

Copy data.

Create creates a content(same behavior as Draft&Publish but store published version directly).

CreateVersion creates a new version.It doesn't validate version number is increment.

Delete content by content id.

Delete content, relations and location.Note: this is only for when there is 1 location.

Delete content by location id.

enable or disable user(enable = false means disable)todo: create a user interface.

Generate name based on name_pattern from definition.

Get operation handler list based on rules defined in operation_handler.json/yamltarget is the real vaule the condition matches totarget should not include 'event' key since it's in the parameter already.

InvokeCallback invokes callbacks based on condition match resultsee content_handler.json/yaml for conditions.

Move moves contents to targetCheck delete&create permission.note: it dosn't check if target can create sub-children(only check if it can create direct children).

Update content.The inputs doesn't need to include all required fields.

Validate validates and returns a validation result.

Callback struct.

todo: think it might be good to use "struct with callback method" instead of interface.This is a callback based on type.It's used for customzed content type.