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callbacks.go
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callbacks.go
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package audited
import (
"fmt"
"reflect"
"github.com/jinzhu/gorm"
)
type auditableInterface interface {
SetCreatedBy(createdBy interface{})
GetCreatedBy() string
SetUpdatedBy(updatedBy interface{})
GetUpdatedBy() string
}
func isAuditable(scope *gorm.Scope) (isAuditable bool) {
if scope.GetModelStruct().ModelType == nil {
return false
}
_, isAuditable = reflect.New(scope.GetModelStruct().ModelType).Interface().(auditableInterface)
return
}
func getCurrentUser(scope *gorm.Scope) (string, bool) {
var user interface{}
var hasUser bool
user, hasUser = scope.DB().Get("audited:current_user")
if !hasUser {
user, hasUser = scope.DB().Get("qor:current_user")
}
if hasUser {
var currentUser string
if primaryField := scope.New(user).PrimaryField(); primaryField != nil {
currentUser = fmt.Sprintf("%v", primaryField.Field.Interface())
} else {
currentUser = fmt.Sprintf("%v", user)
}
return currentUser, true
}
return "", false
}
func assignCreatedBy(scope *gorm.Scope) {
if isAuditable(scope) {
if user, ok := getCurrentUser(scope); ok {
scope.SetColumn("CreatedBy", user)
}
}
}
func assignUpdatedBy(scope *gorm.Scope) {
if isAuditable(scope) {
if user, ok := getCurrentUser(scope); ok {
if attrs, ok := scope.InstanceGet("gorm:update_attrs"); ok {
updateAttrs := attrs.(map[string]interface{})
updateAttrs["updated_by"] = user
scope.InstanceSet("gorm:update_attrs", updateAttrs)
} else {
scope.SetColumn("UpdatedBy", user)
}
}
}
}
// RegisterCallbacks register callback into GORM DB
func RegisterCallbacks(db *gorm.DB) {
callback := db.Callback()
if callback.Create().Get("audited:assign_created_by") == nil {
callback.Create().After("gorm:before_create").Register("audited:assign_created_by", assignCreatedBy)
}
if callback.Update().Get("audited:assign_updated_by") == nil {
callback.Update().After("gorm:before_update").Register("audited:assign_updated_by", assignUpdatedBy)
}
}