mirror of
https://github.com/gogrlx/nats-server.git
synced 2026-04-14 10:10:42 -07:00
79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
/*
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* Copyright 2018-2019 The NATS Authors
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package jwt
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import (
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"encoding/json"
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"fmt"
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"strings"
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)
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const (
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// Version is semantic version.
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Version = "2.0.3"
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// TokenTypeJwt is the JWT token type supported JWT tokens
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// encoded and decoded by this library
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// from RFC7519 5.1 "typ":
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// it is RECOMMENDED that "JWT" always be spelled using uppercase characters for compatibility
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TokenTypeJwt = "JWT"
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// AlgorithmNkey is the algorithm supported by JWT tokens
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// encoded and decoded by this library
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AlgorithmNkeyOld = "ed25519"
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AlgorithmNkey = AlgorithmNkeyOld + "-nkey"
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)
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// Header is a JWT Jose Header
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type Header struct {
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Type string `json:"typ"`
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Algorithm string `json:"alg"`
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}
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// Parses a header JWT token
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func parseHeaders(s string) (*Header, error) {
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h, err := decodeString(s)
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if err != nil {
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return nil, err
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}
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header := Header{}
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if err := json.Unmarshal(h, &header); err != nil {
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return nil, err
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}
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if err := header.Valid(); err != nil {
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return nil, err
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}
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return &header, nil
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}
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// Valid validates the Header. It returns nil if the Header is
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// a JWT header, and the algorithm used is the NKEY algorithm.
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func (h *Header) Valid() error {
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if TokenTypeJwt != strings.ToUpper(h.Type) {
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return fmt.Errorf("not supported type %q", h.Type)
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}
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alg := strings.ToLower(h.Algorithm)
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if !strings.HasPrefix(alg, AlgorithmNkeyOld) {
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return fmt.Errorf("unexpected %q algorithm", h.Algorithm)
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}
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if AlgorithmNkeyOld != alg && AlgorithmNkey != alg {
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return fmt.Errorf("unexpected %q algorithm", h.Algorithm)
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}
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return nil
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}
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