package feed

//go:generate stringer -linecomment -type=V3Version

import (
  "encoding/json"
  "fmt"
)

// CVSS v3 version
type V3Version byte

const (
  V30 V3Version = iota // 3.0
  V31 // 3.1
)

// Unmarshal CVSS V3 version from JSON.
func (me *V3Version) 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 "3.0":
    *me = V30
  case "3.1":
    *me = V31
  default:
    // return error
    return fmt.Errorf("unknown CVSS version: %s", s)
  }

  // return success
  return nil
}