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common.go
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common.go
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// Copyright 2015-2016, Cyrill @ Schumacher.fm and the CoreStore contributors
//
// 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 jwtclaim
import (
"crypto/subtle"
"time"
)
// Key constants define the main claims used for Set() and Get() functions.
// Those constants are implemented in the StandardClaims type.
const (
KeyAudience = "aud"
KeyExpiresAt = "exp"
KeyID = "jti"
KeyIssuedAt = "iat"
KeyIssuer = "iss"
KeyNotBefore = "nbf"
KeySubject = "sub"
KeyTimeSkew = "skew" // not marshalled, internal usage.
)
// allKeys first seven entries only supported by Standard type and all entries
// supported by Store type.
var allKeys = [9]string{KeyAudience, KeyExpiresAt, KeyID, KeyIssuedAt, KeyIssuer, KeyNotBefore, KeySubject, KeyStore, KeyUserID}
// TimeFunc provides the current time when parsing token to validate "exp" claim
// (expiration time). You can override it to use another time value. This is
// useful for testing or if your server uses a different time zone than your
// tokens.
var TimeFunc = time.Now
func verifyConstantTime(aud, cmp []byte, required bool) bool {
if len(aud) == 0 {
return !required
}
return subtle.ConstantTimeCompare(aud, cmp) == 1
}
func verifyExp(skew time.Duration, exp, now int64, required bool) bool {
if exp == 0 {
return !required
}
now -= int64(skew.Seconds())
return now <= exp
}
func verifyIat(iat int64, now int64, required bool) bool {
if iat == 0 {
return !required
}
return now >= iat
}
func verifyNbf(skew time.Duration, nbf int64, now int64, required bool) bool {
if nbf == 0 {
return !required
}
now += int64(skew.Seconds())
return now >= nbf
}