/
options.go
86 lines (70 loc) · 1.84 KB
/
options.go
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// Copyright 2017 AMIS Technologies
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rand
import (
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"encoding/base64"
"encoding/hex"
"hash"
"math/rand"
"github.com/satori/go.uuid"
)
type Option func(*generator)
// ----------------------------------------------------------------------------
// Random bytes length
func Randomness(len int) Option {
return func(g *generator) {
g.len = len
}
}
// ----------------------------------------------------------------------------
// Hashing Policy
func Hash(hashFn func() hash.Hash) Option {
return func(g *generator) {
g.hasher = hashFn
}
}
func Sha1Hash() Option {
return Hash(sha1.New)
}
func Sha256Hash() Option {
return Hash(sha256.New)
}
func Sha512Hash() Option {
return Hash(sha512.New)
}
// ----------------------------------------------------------------------------
// Encoding Policy
func Encoder(encoder func(src []byte) string) Option {
return func(h *generator) {
h.encoder = encoder
}
}
func Base64Encoder() Option {
return Encoder(base64.StdEncoding.EncodeToString)
}
func HexEncoder() Option {
return Encoder(hex.EncodeToString)
}
func UUIDEncoder() Option {
return Encoder(func(src []byte) string {
b := make([]byte, 16)
_, _ = rand.Read(b)
copy(b, src)
uuid, _ := uuid.FromBytes(b)
return uuid.String()
})
}