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idtoken.go
50 lines (45 loc) · 937 Bytes
/
idtoken.go
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package idtoken
import (
"bytes"
"encoding/base64"
"encoding/gob"
"time"
"github.com/newlix/idtoken/gcm"
)
type payload struct {
ID string
IssueUnix int64
}
func New(key []byte, id string) (string, error) {
p := payload{
ID: id,
IssueUnix: time.Now().Unix(),
}
var b bytes.Buffer
enc := gob.NewEncoder(&b)
if err := enc.Encode(&p); err != nil {
return "", err
}
cb, err := gcm.Encrypt(key, b.Bytes())
if err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(cb), nil
}
func Parse(key []byte, s string) (id string, issueUnix int64, err error) {
p := payload{}
cb, err := base64.RawURLEncoding.DecodeString(s)
if err != nil {
return "", 0, err
}
b, err := gcm.Decrypt(key, cb)
if err != nil {
return "", 0, err
}
buf := bytes.NewBuffer(b)
dec := gob.NewDecoder(buf)
if err := dec.Decode(&p); err != nil {
return "", 0, err
}
return p.ID, p.IssueUnix, err
}