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data.go
58 lines (53 loc) · 1.39 KB
/
data.go
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package sensitive
import (
"bytes"
"encoding/json"
"fmt"
"os"
"reflect"
)
// secretValue is the masked value used by lib
var secretValue = func() string {
secret := os.Getenv("SET_VALUE")
if secret == "" {
return "dummy-value"
}
return secret
}
// Mask used to hide/mask sensitive fields in input. This currently
// supports only `struct` and `string` fields when an `int` field is provided
// for masking an error is emitted.When no fields are provided for masking
// it emits an error with informative message
func Mask(d any, fields ...string) (string, error) {
if len(fields) < 1 {
fmt.Printf("%s\n", "required atleast one field")
}
inpBytes, err := json.Marshal(&d)
if err != nil {
return "", err
}
// extract list of fields
inputType := reflect.TypeOf(d)
inpFields := reflect.VisibleFields(inputType)
typ := reflect.StructOf(inpFields)
v := reflect.New(typ).Elem()
if err := json.Unmarshal(inpBytes, v.Addr().Interface()); err != nil {
return "", err
}
// replace sensitive fields
for _, field := range fields {
switch {
case v.FieldByName(field).Kind().String() == "string":
v.FieldByName(field).SetString(secretValue())
default:
return "",
fmt.Errorf("invalid column data type,supports only string data type")
}
}
s := v.Addr().Interface()
b := new(bytes.Buffer)
if err := json.NewEncoder(b).Encode(s); err != nil {
return "", err
}
return b.String(), nil
}