forked from dgrijalva/jwt-go
/
claims.go
148 lines (119 loc) · 3.9 KB
/
claims.go
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package jwt
import (
"crypto/subtle"
"fmt"
"math"
"time"
)
// For a type to be a Claims object, it must just have a Valid method that determines
// if the token is invalid for any supported reason
type Claims interface {
Valid() error
}
// Structured version of Claims Section, as referenced at
// https://tools.ietf.org/html/rfc7519#section-4.1
// See examples for how to use this with your own claim types
type StandardClaims struct {
Audience []string `json:"aud,omitempty"`
ExpiresAt float64 `json:"exp,omitempty"`
Id string `json:"jti,omitempty"`
IssuedAt float64 `json:"iat,omitempty"`
Issuer string `json:"iss,omitempty"`
NotBefore float64 `json:"nbf,omitempty"`
Subject string `json:"sub,omitempty"`
}
// Validates time based claims "exp, iat, nbf".
// There is no accounting for clock skew.
// As well, if any of the above claims are not in the token, it will still
// be considered a valid claim.
func (c StandardClaims) Valid() error {
vErr := new(ValidationError)
now := TimeFunc()
// The claims below are optional, by default, so if they are set to the
// default value in Go, let's not fail the verification for them.
if c.VerifyExpiresAt(now, false) == false {
delta := now.Sub(parseUnixFloat(c.ExpiresAt))
vErr.Inner = fmt.Errorf("token is expired by %v", delta)
vErr.Errors |= ValidationErrorExpired
}
if c.VerifyIssuedAt(now, false) == false {
vErr.Inner = fmt.Errorf("Token used before issued")
vErr.Errors |= ValidationErrorIssuedAt
}
if c.VerifyNotBefore(now, false) == false {
vErr.Inner = fmt.Errorf("token is not valid yet")
vErr.Errors |= ValidationErrorNotValidYet
}
if vErr.valid() {
return nil
}
return vErr
}
// Compares the aud claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyAudience(cmp string, req bool) bool {
return verifyAud(c.Audience, cmp, req)
}
// Compares the exp claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyExpiresAt(cmp time.Time, req bool) bool {
return verifyExp(c.ExpiresAt, cmp, req)
}
// Compares the iat claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyIssuedAt(cmp time.Time, req bool) bool {
return verifyIat(c.IssuedAt, cmp, req)
}
// Compares the iss claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyIssuer(cmp string, req bool) bool {
return verifyIss(c.Issuer, cmp, req)
}
// Compares the nbf claim against cmp.
// If required is false, this method will return true if the value matches or is unset
func (c *StandardClaims) VerifyNotBefore(cmp time.Time, req bool) bool {
return verifyNbf(c.NotBefore, cmp, req)
}
// ----- helpers
func verifyAud(aud []string, cmp string, required bool) bool {
if len(aud) == 0 {
return !required
}
for _, a := range aud {
if subtle.ConstantTimeCompare([]byte(a), []byte(cmp)) != 0 {
return true
}
}
return false
}
func verifyExp(exp float64, now time.Time, required bool) bool {
if exp == 0. {
return !required
}
pexp := parseUnixFloat(exp)
return pexp.Equal(now) || now.Before(pexp)
}
func verifyIat(iat float64, now time.Time, required bool) bool {
if iat == 0. {
return !required
}
piat := parseUnixFloat(iat)
return piat.Equal(now) || now.After(piat)
}
func verifyIss(iss string, cmp string, required bool) bool {
if iss == "" {
return !required
}
return subtle.ConstantTimeCompare([]byte(iss), []byte(cmp)) != 0
}
func verifyNbf(nbf float64, now time.Time, required bool) bool {
if nbf == 0. {
return !required
}
pnbf := parseUnixFloat(nbf)
return pnbf.Equal(now) || now.After(pnbf)
}
func parseUnixFloat(ts float64) time.Time {
int, frac := math.Modf(ts)
return time.Unix(int64(int), int64(frac*(1e9)))
}