package feed

//go:generate stringer -linecomment -type=V2Version

import (
  "encoding/json"
  "fmt"
)

// CVSS v2 version
type V2Version byte

const (
  V20 V2Version = iota // 2.0
)

// Unmarshal CVSS V2 version from JSON.
func (me *V2Version) 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 "2.0":
    *me = V20
  default:
    // return error
    return fmt.Errorf("unknown CVSS version: %s", s)
  }

  // return success
  return nil
}