/
tokenutils.go
106 lines (85 loc) · 2.53 KB
/
tokenutils.go
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// Copyright 2019 Aporeto Inc.
// 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 tokenutils
import (
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"strings"
)
// Snip snips the given token from the given error.
func Snip(err error, token string) error {
if len(token) == 0 || err == nil {
return err
}
return fmt.Errorf("%s",
strings.Replace(
err.Error(),
token,
"[snip]",
-1),
)
}
// UnsecureClaimsMap decodes the claims in the given JWT token without
// verifying its validity. Only use or trust this after proper validation.
func UnsecureClaimsMap(token string) (claims map[string]interface{}, err error) {
parts := strings.Split(token, ".")
if len(parts) != 3 {
return nil, errors.New("invalid jwt: not enough segments")
}
data, err := base64.RawStdEncoding.DecodeString(parts[1])
if err != nil {
return nil, fmt.Errorf("invalid jwt: %s", err)
}
claims = map[string]interface{}{}
if err := json.Unmarshal(data, &claims); err != nil {
return nil, fmt.Errorf("invalid jwt: %s", err)
}
return claims, nil
}
// SigAlg returns the signature used by the token
func SigAlg(token string) (string, error) {
parts := strings.Split(token, ".")
if len(parts) != 3 {
return "", errors.New("invalid jwt: not enough segments")
}
data, err := base64.RawStdEncoding.DecodeString(parts[0])
if err != nil {
return "", fmt.Errorf("invalid jwt: %s", err)
}
header := struct {
Alg string `json:"alg"`
}{}
if err := json.Unmarshal(data, &header); err != nil {
return "", fmt.Errorf("invalid jwt: %s", err)
}
return header.Alg, nil
}
// ExtractQuota extracts the eventual quota from a token.
// Not that the token is not verified in the process,
// you the verification must be done before trusting
// the extracted quota value.
func ExtractQuota(token string) (int, error) {
claims, err := UnsecureClaimsMap(token)
if err != nil {
return 0, err
}
quota, ok := claims["quota"]
if !ok {
return 0, nil
}
q, ok := quota.(float64)
if !ok {
return 0, fmt.Errorf("invalid quota claim type")
}
return int(q), nil
}