useCases/decrypt/Decrypt.go
package decrypt
import "gopkg.in/yaml.v2"
/*
decrypt use case decrypts data with `encryptionService` using `documentManipulator`.
`encryptionService` encapsulates logic of encrypting, and `documentManipulator`
handles data as document to encrypt all or part of data.
*/
type decrypt struct {
encryptionService DecryptionService
documentManipulator YamlManipulator
}
func NewDecrypt(encryptionService DecryptionService, documentManipulator YamlManipulator) *decrypt {
return &decrypt{encryptionService: encryptionService, documentManipulator: documentManipulator}
}
func (useCase decrypt) Execute(dataYaml string) (string, error) {
document := make(yaml.MapSlice, 0)
err := yaml.Unmarshal([]byte(dataYaml), &document)
if err != nil {
return "", err
}
encryptedDocument, err := useCase.documentManipulator.ApplyToLeafs(useCase.encryptionService.Decrypt, document)
if err != nil {
return "", err
}
encryptedYaml, err := yaml.Marshal(encryptedDocument)
if err != nil {
return "", err
}
return string(encryptedYaml), nil
}
type DecryptionService interface {
Decrypt([]byte) ([]byte, error)
}
//data types: yaml.MapSlice, yaml.MapItem, and Exact value
type YamlManipulator interface {
ApplyToLeafs(callback func([]byte) ([]byte, error), data interface{}) (interface{}, error)
}