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package oauth
import (
"bytes"
"crypto/rand"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"strings"
)
func randomToken(size int) (string, error) {
buf := make([]byte, size)
if _, err := rand.Read(buf); err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(buf), nil
}
func encodeSegment(value any) (string, error) {
raw, err := json.Marshal(value)
if err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(raw), nil
}
func decodeSegment(segment string, value any) error {
raw, err := base64.RawURLEncoding.DecodeString(segment)
if err != nil {
return err
}
decoder := json.NewDecoder(bytes.NewReader(raw))
decoder.UseNumber()
if err := decoder.Decode(value); err != nil {
return err
}
if _, err := decoder.Token(); !errors.Is(err, io.EOF) {
return fmt.Errorf("oauth: trailing JSON data")
}
return nil
}
func splitJWT(token string) (string, string, string, bool) {
parts := strings.Split(token, ".")
if len(parts) != 3 {
return "", "", "", false
}
return parts[0], parts[1], parts[2], true
}
