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password_generator.go
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password_generator.go
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package types
import (
"crypto/rand"
"math/big"
"github.com/cloudfoundry/bosh-utils/errors"
)
type passwordGenerator struct{}
var letterRunes = []rune("abcdefghijklmnopqrstuvwxyz0123456789")
const DefaultPasswordLength = 20
type passwordParams struct {
Length int `yaml:"length"`
}
var supportedPasswordParams = []string{
"length",
}
func NewPasswordGenerator() ValueGenerator {
return passwordGenerator{}
}
func (passwordGenerator) Generate(parameters interface{}) (interface{}, error) {
var params passwordParams
err := objToStruct(parameters, ¶ms, supportedPasswordParams)
if err != nil {
return nil, errors.WrapError(err, "Failed to generate password, parameters are invalid")
}
if params.Length < 0 {
return nil, errors.Error("Failed to generate password, 'length' param cannot be negative")
}
if params.Length == 0 {
params.Length = DefaultPasswordLength
}
lengthLetterRunes := big.NewInt(int64(len(letterRunes)))
passwordRunes := make([]rune, params.Length)
for i := range passwordRunes {
index, err := rand.Int(rand.Reader, lengthLetterRunes)
if err != nil {
return nil, err
}
passwordRunes[i] = letterRunes[index.Int64()]
}
return string(passwordRunes), nil
}