/
hash_sha256.go
67 lines (52 loc) · 1.38 KB
/
hash_sha256.go
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package transform
import (
"context"
"crypto/sha256"
"encoding/json"
"fmt"
"github.com/brexhq/substation/config"
"github.com/brexhq/substation/message"
)
func newHashSHA256(_ context.Context, cfg config.Config) (*hashSHA256, error) {
conf := hashConfig{}
if err := conf.Decode(cfg.Settings); err != nil {
return nil, fmt.Errorf("transform: hash_sha256: %v", err)
}
if err := conf.Validate(); err != nil {
return nil, fmt.Errorf("transform: hash_sha256: %v", err)
}
tf := hashSHA256{
conf: conf,
isObject: conf.Object.SourceKey != "" && conf.Object.TargetKey != "",
}
return &tf, nil
}
type hashSHA256 struct {
conf hashConfig
isObject bool
}
func (tf *hashSHA256) Transform(ctx context.Context, msg *message.Message) ([]*message.Message, error) {
if msg.IsControl() {
return []*message.Message{msg}, nil
}
if !tf.isObject {
sum := sha256.Sum256(msg.Data())
str := fmt.Sprintf("%x", sum)
msg.SetData([]byte(str))
return []*message.Message{msg}, nil
}
value := msg.GetValue(tf.conf.Object.SourceKey)
if !value.Exists() {
return []*message.Message{msg}, nil
}
sum := sha256.Sum256(value.Bytes())
str := fmt.Sprintf("%x", sum)
if err := msg.SetValue(tf.conf.Object.TargetKey, str); err != nil {
return nil, err
}
return []*message.Message{msg}, nil
}
func (tf *hashSHA256) String() string {
b, _ := json.Marshal(tf.conf)
return string(b)
}