package feed

//go:generate stringer -linecomment -type=V2Authentication

import (
  "encoding/json"
  "fmt"
)

// CVSS v2 authentication
type V2Authentication byte

const (
  V2AuthNone V2Authentication = iota // NONE
  V2AuthSingle // SINGLE
  V2AuthMultiple // MULTIPLE
)

// Unmarshal CVSS V2 authentication from JSON.
func (me *V2Authentication) UnmarshalJSON(b []byte) error {
  // decode string, check for error
  var s string
  if err := json.Unmarshal(b, &s); err != nil {
    return err
  }

  // check value
  switch s {
  case "NONE":
    *me = V2AuthNone
  case "SINGLE":
    *me = V2AuthSingle
  case "MULTIPLE":
    *me = V2AuthMultiple
  default:
    // return error
    return fmt.Errorf("unknown CVSS v2 authentication: %s", s)
  }

  // return success
  return nil
}