Commit fad5ad09 authored by Nobuhiro Iwamatsu's avatar Nobuhiro Iwamatsu

New upstream version 3.2.0

parent 0a48abfd
language: go
script:
- go vet ./...
- go test -v ./...
go:
- 1.3
- 1.4
- 1.5
- 1.6
- 1.7
- tip
## Migration Guide from v2 -> v3
Version 3 adds several new, frequently requested features. To do so, it introduces a few breaking changes. We've worked to keep these as minimal as possible. This guide explains the breaking changes and how you can quickly update your code.
### `Token.Claims` is now an interface type
The most requested feature from the 2.0 verison of this library was the ability to provide a custom type to the JSON parser for claims. This was implemented by introducing a new interface, `Claims`, to replace `map[string]interface{}`. We also included two concrete implementations of `Claims`: `MapClaims` and `StandardClaims`.
`MapClaims` is an alias for `map[string]interface{}` with built in validation behavior. It is the default claims type when using `Parse`. The usage is unchanged except you must type cast the claims property.
The old example for parsing a token looked like this..
```go
if token, err := jwt.Parse(tokenString, keyLookupFunc); err == nil {
fmt.Printf("Token for user %v expires %v", token.Claims["user"], token.Claims["exp"])
}
```
is now directly mapped to...
```go
if token, err := jwt.Parse(tokenString, keyLookupFunc); err == nil {
claims := token.Claims.(jwt.MapClaims)
fmt.Printf("Token for user %v expires %v", claims["user"], claims["exp"])
}
```
`StandardClaims` is designed to be embedded in your custom type. You can supply a custom claims type with the new `ParseWithClaims` function. Here's an example of using a custom claims type.
```go
type MyCustomClaims struct {
User string
*StandardClaims
}
if token, err := jwt.ParseWithClaims(tokenString, &MyCustomClaims{}, keyLookupFunc); err == nil {
claims := token.Claims.(*MyCustomClaims)
fmt.Printf("Token for user %v expires %v", claims.User, claims.StandardClaims.ExpiresAt)
}
```
### `ParseFromRequest` has been moved
To keep this library focused on the tokens without becoming overburdened with complex request processing logic, `ParseFromRequest` and its new companion `ParseFromRequestWithClaims` have been moved to a subpackage, `request`. The method signatues have also been augmented to receive a new argument: `Extractor`.
`Extractors` do the work of picking the token string out of a request. The interface is simple and composable.
This simple parsing example:
```go
if token, err := jwt.ParseFromRequest(tokenString, req, keyLookupFunc); err == nil {
fmt.Printf("Token for user %v expires %v", token.Claims["user"], token.Claims["exp"])
}
```
is directly mapped to:
```go
if token, err := request.ParseFromRequest(req, request.OAuth2Extractor, keyLookupFunc); err == nil {
claims := token.Claims.(jwt.MapClaims)
fmt.Printf("Token for user %v expires %v", claims["user"], claims["exp"])
}
```
There are several concrete `Extractor` types provided for your convenience:
* `HeaderExtractor` will search a list of headers until one contains content.
* `ArgumentExtractor` will search a list of keys in request query and form arguments until one contains content.
* `MultiExtractor` will try a list of `Extractors` in order until one returns content.
* `AuthorizationHeaderExtractor` will look in the `Authorization` header for a `Bearer` token.
* `OAuth2Extractor` searches the places an OAuth2 token would be specified (per the spec): `Authorization` header and `access_token` argument
* `PostExtractionFilter` wraps an `Extractor`, allowing you to process the content before it's parsed. A simple example is stripping the `Bearer ` text from a header
### RSA signing methods no longer accept `[]byte` keys
Due to a [critical vulnerability](https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/), we've decided the convenience of accepting `[]byte` instead of `rsa.PublicKey` or `rsa.PrivateKey` isn't worth the risk of misuse.
To replace this behavior, we've added two helper methods: `ParseRSAPrivateKeyFromPEM(key []byte) (*rsa.PrivateKey, error)` and `ParseRSAPublicKeyFromPEM(key []byte) (*rsa.PublicKey, error)`. These are just simple helpers for unpacking PEM encoded PKCS1 and PKCS8 keys. If your keys are encoded any other way, all you need to do is convert them to the `crypto/rsa` package's types.
```go
func keyLookupFunc(*Token) (interface{}, error) {
// Don't forget to validate the alg is what you expect:
if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
// Look up key
key, err := lookupPublicKey(token.Header["kid"])
if err != nil {
return nil, err
}
// Unpack key from PEM encoded PKCS8
return jwt.ParseRSAPublicKeyFromPEM(key)
}
```
This diff is collapsed.
## `jwt-go` Version History
#### 3.2.0
* Added method `ParseUnverified` to allow users to split up the tasks of parsing and validation
* HMAC signing method returns `ErrInvalidKeyType` instead of `ErrInvalidKey` where appropriate
* Added options to `request.ParseFromRequest`, which allows for an arbitrary list of modifiers to parsing behavior. Initial set include `WithClaims` and `WithParser`. Existing usage of this function will continue to work as before.
* Deprecated `ParseFromRequestWithClaims` to simplify API in the future.
#### 3.1.0
* Improvements to `jwt` command line tool
* Added `SkipClaimsValidation` option to `Parser`
* Documentation updates
#### 3.0.0
* **Compatibility Breaking Changes**: See MIGRATION_GUIDE.md for tips on updating your code
* Dropped support for `[]byte` keys when using RSA signing methods. This convenience feature could contribute to security vulnerabilities involving mismatched key types with signing methods.
* `ParseFromRequest` has been moved to `request` subpackage and usage has changed
* The `Claims` property on `Token` is now type `Claims` instead of `map[string]interface{}`. The default value is type `MapClaims`, which is an alias to `map[string]interface{}`. This makes it possible to use a custom type when decoding claims.
* Other Additions and Changes
* Added `Claims` interface type to allow users to decode the claims into a custom type
* Added `ParseWithClaims`, which takes a third argument of type `Claims`. Use this function instead of `Parse` if you have a custom type you'd like to decode into.
* Dramatically improved the functionality and flexibility of `ParseFromRequest`, which is now in the `request` subpackage
* Added `ParseFromRequestWithClaims` which is the `FromRequest` equivalent of `ParseWithClaims`
* Added new interface type `Extractor`, which is used for extracting JWT strings from http requests. Used with `ParseFromRequest` and `ParseFromRequestWithClaims`.
* Added several new, more specific, validation errors to error type bitmask
* Moved examples from README to executable example files
* Signing method registry is now thread safe
* Added new property to `ValidationError`, which contains the raw error returned by calls made by parse/verify (such as those returned by keyfunc or json parser)
#### 2.7.0
This will likely be the last backwards compatible release before 3.0.0, excluding essential bug fixes.
......
package jwt
import (
"crypto/subtle"
"fmt"
"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 int64 `json:"exp,omitempty"`
Id string `json:"jti,omitempty"`
IssuedAt int64 `json:"iat,omitempty"`
Issuer string `json:"iss,omitempty"`
NotBefore int64 `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().Unix()
// 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 := time.Unix(now, 0).Sub(time.Unix(c.ExpiresAt, 0))
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 int64, 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 int64, 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 int64, req bool) bool {
return verifyNbf(c.NotBefore, cmp, req)
}
// ----- helpers
func verifyAud(aud string, cmp string, required bool) bool {
if aud == "" {
return !required
}
if subtle.ConstantTimeCompare([]byte(aud), []byte(cmp)) != 0 {
return true
} else {
return false
}
}
func verifyExp(exp int64, now int64, required bool) bool {
if exp == 0 {
return !required
}
return now <= exp
}
func verifyIat(iat int64, now int64, required bool) bool {
if iat == 0 {
return !required
}
return now >= iat
}
func verifyIss(iss string, cmp string, required bool) bool {
if iss == "" {
return !required
}
if subtle.ConstantTimeCompare([]byte(iss), []byte(cmp)) != 0 {
return true
} else {
return false
}
}
func verifyNbf(nbf int64, now int64, required bool) bool {
if nbf == 0 {
return !required
}
return now >= nbf
}
......@@ -6,8 +6,8 @@ the command line.
The following will create and sign a token, then verify it and output the original claims:
echo {\"foo\":\"bar\"} | bin/jwt -key test/sample_key -alg RS256 -sign - | bin/jwt -key test/sample_key.pub -verify -
echo {\"foo\":\"bar\"} | ./jwt -key ../../test/sample_key -alg RS256 -sign - | ./jwt -key ../../test/sample_key.pub -alg RS256 -verify -
To simply display a token, use:
echo $JWT | jwt -show -
echo $JWT | ./jwt -show -
......@@ -25,14 +25,20 @@ var (
flagKey = flag.String("key", "", "path to key file or '-' to read from stdin")
flagCompact = flag.Bool("compact", false, "output compact JSON")
flagDebug = flag.Bool("debug", false, "print out all kinds of debug data")
flagClaims = make(ArgList)
flagHead = make(ArgList)
// Modes - exactly one of these is required
flagSign = flag.String("sign", "", "path to claims object to sign or '-' to read from stdin")
flagSign = flag.String("sign", "", "path to claims object to sign, '-' to read from stdin, or '+' to use only -claim args")
flagVerify = flag.String("verify", "", "path to JWT token to verify or '-' to read from stdin")
flagShow = flag.String("show", "", "path to JWT file or '-' to read from stdin")
)
func main() {
// Plug in Var flags
flag.Var(flagClaims, "claim", "add additional claims. may be used more than once")
flag.Var(flagHead, "header", "add additional header params. may be used more than once")
// Usage message if you ask for -help or if you mess up inputs.
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
......@@ -74,6 +80,8 @@ func loadData(p string) ([]byte, error) {
var rdr io.Reader
if p == "-" {
rdr = os.Stdin
} else if p == "+" {
return []byte("{}"), nil
} else {
if f, err := os.Open(p); err == nil {
rdr = f
......@@ -126,6 +134,8 @@ func verifyToken() error {
}
if isEs() {
return jwt.ParseECPublicKeyFromPEM(data)
} else if isRs() {
return jwt.ParseRSAPublicKeyFromPEM(data)
}
return data, nil
})
......@@ -166,11 +176,18 @@ func signToken() error {
}
// parse the JSON of the claims
var claims map[string]interface{}
var claims jwt.MapClaims
if err := json.Unmarshal(tokData, &claims); err != nil {
return fmt.Errorf("Couldn't parse claims JSON: %v", err)
}
// add command line claims
if len(flagClaims) > 0 {
for k, v := range flagClaims {
claims[k] = v
}
}
// get the key
var key interface{}
key, err = loadData(*flagKey)
......@@ -185,8 +202,14 @@ func signToken() error {
}
// create a new token
token := jwt.New(alg)
token.Claims = claims
token := jwt.NewWithClaims(alg, claims)
// add command line headers
if len(flagHead) > 0 {
for k, v := range flagHead {
token.Header[k] = v
}
}
if isEs() {
if k, ok := key.([]byte); !ok {
......@@ -197,6 +220,15 @@ func signToken() error {
return err
}
}
} else if isRs() {
if k, ok := key.([]byte); !ok {
return fmt.Errorf("Couldn't convert key data to key")
} else {
key, err = jwt.ParseRSAPrivateKeyFromPEM(k)
if err != nil {
return err
}
}
}
if out, err := token.SignedString(key); err == nil {
......@@ -244,3 +276,7 @@ func showToken() error {
func isEs() bool {
return strings.HasPrefix(*flagAlg, "ES")
}
func isRs() bool {
return strings.HasPrefix(*flagAlg, "RS")
}
package main
import (
"encoding/json"
"fmt"
"strings"
)
type ArgList map[string]string
func (l ArgList) String() string {
data, _ := json.Marshal(l)
return string(data)
}
func (l ArgList) Set(arg string) error {
parts := strings.SplitN(arg, "=", 2)
if len(parts) != 2 {
return fmt.Errorf("Invalid argument '%v'. Must use format 'key=value'. %v", arg, parts)
}
l[parts[0]] = parts[1]
return nil
}
......@@ -14,6 +14,7 @@ var (
)
// Implements the ECDSA family of signing methods signing methods
// Expects *ecdsa.PrivateKey for signing and *ecdsa.PublicKey for verification
type SigningMethodECDSA struct {
Name string
Hash crypto.Hash
......@@ -69,7 +70,7 @@ func (m *SigningMethodECDSA) Verify(signingString, signature string, key interfa
case *ecdsa.PublicKey:
ecdsaKey = k
default:
return ErrInvalidKey
return ErrInvalidKeyType
}
if len(sig) != 2*m.KeySize {
......@@ -103,7 +104,7 @@ func (m *SigningMethodECDSA) Sign(signingString string, key interface{}) (string
case *ecdsa.PrivateKey:
ecdsaKey = k
default:
return "", ErrInvalidKey
return "", ErrInvalidKeyType
}
// Create the hasher
......
......@@ -6,9 +6,9 @@ import (
// Error constants
var (
ErrInvalidKey = errors.New("key is invalid or of invalid type")
ErrHashUnavailable = errors.New("the requested hash function is unavailable")
ErrNoTokenInRequest = errors.New("no token present in request")
ErrInvalidKey = errors.New("key is invalid")
ErrInvalidKeyType = errors.New("key is of invalid type")
ErrHashUnavailable = errors.New("the requested hash function is unavailable")
)
// The errors that might occur when parsing and validating a token
......@@ -16,14 +16,21 @@ const (
ValidationErrorMalformed uint32 = 1 << iota // Token is malformed
ValidationErrorUnverifiable // Token could not be verified because of signing problems
ValidationErrorSignatureInvalid // Signature validation failed
ValidationErrorExpired // Exp validation failed
ValidationErrorNotValidYet // NBF validation failed
// Standard Claim validation errors
ValidationErrorAudience // AUD validation failed
ValidationErrorExpired // EXP validation failed
ValidationErrorIssuedAt // IAT validation failed
ValidationErrorIssuer // ISS validation failed
ValidationErrorNotValidYet // NBF validation failed
ValidationErrorId // JTI validation failed
ValidationErrorClaimsInvalid // Generic claims validation error
)
// Helper for constructing a ValidationError with a string error message
func NewValidationError(errorText string, errorFlags uint32) *ValidationError {
return &ValidationError{
Inner: errors.New(errorText),
text: errorText,
Errors: errorFlags,
}
}
......@@ -32,20 +39,21 @@ func NewValidationError(errorText string, errorFlags uint32) *ValidationError {
type ValidationError struct {
Inner error // stores the error returned by external dependencies, i.e.: KeyFunc
Errors uint32 // bitfield. see ValidationError... constants
text string // errors that do not have a valid error just have text
}
// Validation error is an error type
func (e ValidationError) Error() string {
if e.Inner == nil {
if e.Inner != nil {
return e.Inner.Error()
} else if e.text != "" {
return e.text
} else {
return "token is invalid"
}
return e.Inner.Error()
}
// No errors
func (e *ValidationError) valid() bool {
if e.Errors > 0 {
return false
}
return true
return e.Errors == 0
}
......@@ -6,32 +6,93 @@ import (
"time"
)
func ExampleParse(myToken string, myLookupKey func(interface{}) (interface{}, error)) {
token, err := jwt.Parse(myToken, func(token *jwt.Token) (interface{}, error) {
return myLookupKey(token.Header["kid"])
})
// Example (atypical) using the StandardClaims type by itself to parse a token.
// The StandardClaims type is designed to be embedded into your custom types
// to provide standard validation features. You can use it alone, but there's
// no way to retrieve other fields after parsing.
// See the CustomClaimsType example for intended usage.
func ExampleNewWithClaims_standardClaims() {
mySigningKey := []byte("AllYourBase")
if err == nil && token.Valid {
fmt.Println("Your token is valid. I like your style.")
} else {
fmt.Println("This token is terrible! I cannot accept this.")
// Create the Claims
claims := &jwt.StandardClaims{
ExpiresAt: 15000,
Issuer: "test",
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
ss, err := token.SignedString(mySigningKey)
fmt.Printf("%v %v", ss, err)
//Output: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.QsODzZu3lUZMVdhbO76u3Jv02iYCvEHcYVUI1kOWEU0 <nil>
}
// Example creating a token using a custom claims type. The StandardClaim is embedded
// in the custom type to allow for easy encoding, parsing and validation of standard claims.
func ExampleNewWithClaims_customClaimsType() {
mySigningKey := []byte("AllYourBase")
type MyCustomClaims struct {
Foo string `json:"foo"`
jwt.StandardClaims
}
// Create the Claims
claims := MyCustomClaims{
"bar",
jwt.StandardClaims{
ExpiresAt: 15000,
Issuer: "test",
},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
ss, err := token.SignedString(mySigningKey)
fmt.Printf("%v %v", ss, err)
//Output: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.HE7fK0xOQwFEr4WDgRWj4teRPZ6i3GLwD5YCm6Pwu_c <nil>
}
// Example creating a token using a custom claims type. The StandardClaim is embedded
// in the custom type to allow for easy encoding, parsing and validation of standard claims.
func ExampleParseWithClaims_customClaimsType() {
tokenString := "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.HE7fK0xOQwFEr4WDgRWj4teRPZ6i3GLwD5YCm6Pwu_c"
type MyCustomClaims struct {
Foo string `json:"foo"`
jwt.StandardClaims
}
// sample token is expired. override time so it parses as valid
at(time.Unix(0, 0), func() {
token, err := jwt.ParseWithClaims(tokenString, &MyCustomClaims{}, func(token *jwt.Token) (interface{}, error) {
return []byte("AllYourBase"), nil
})
if claims, ok := token.Claims.(*MyCustomClaims); ok && token.Valid {
fmt.Printf("%v %v", claims.Foo, claims.StandardClaims.ExpiresAt)
} else {
fmt.Println(err)
}
})
// Output: bar 15000
}
func ExampleNew(mySigningKey []byte) (string, error) {
// Create the token
token := jwt.New(jwt.SigningMethodHS256)
// Set some claims
token.Claims["foo"] = "bar"
token.Claims["exp"] = time.Now().Add(time.Hour * 72).Unix()
// Sign and get the complete encoded token as a string
tokenString, err := token.SignedString(mySigningKey)
return tokenString, err
// Override time value for tests. Restore default value after.
func at(t time.Time, f func()) {
jwt.TimeFunc = func() time.Time {
return t
}
f()
jwt.TimeFunc = time.Now
}
func ExampleParse_errorChecking(myToken string, myLookupKey func(interface{}) (interface{}, error)) {
token, err := jwt.Parse(myToken, func(token *jwt.Token) (interface{}, error) {
return myLookupKey(token.Header["kid"])
// An example of parsing the error types using bitfield checks
func ExampleParse_errorChecking() {
// Token from another example. This token is expired
var tokenString = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.HE7fK0xOQwFEr4WDgRWj4teRPZ6i3GLwD5YCm6Pwu_c"
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
return []byte("AllYourBase"), nil
})
if token.Valid {
......@@ -49,4 +110,5 @@ func ExampleParse_errorChecking(myToken string, myLookupKey func(interface{}) (i
fmt.Println("Couldn't handle this token:", err)
}
// Output: Timing is everything
}
......@@ -7,6 +7,7 @@ import (
)
// Implements the HMAC-SHA family of signing methods signing methods
// Expects key type of []byte for both signing and validation
type SigningMethodHMAC struct {
Name string
Hash crypto.Hash
......@@ -49,7 +50,7 @@ func (m *SigningMethodHMAC) Verify(signingString, signature string, key interfac
// Verify the key is the right type
keyBytes, ok := key.([]byte)
if !ok {
return ErrInvalidKey
return ErrInvalidKeyType
}
// Decode signature, for comparison
......@@ -90,5 +91,5 @@ func (m *SigningMethodHMAC) Sign(signingString string, key interface{}) (string,
return EncodeSegment(hasher.Sum(nil)), nil
}
return "", ErrInvalidKey
return "", ErrInvalidKeyType
}
package jwt_test
import (
"fmt"
"github.com/dgrijalva/jwt-go"
"io/ioutil"
"time"
)
// For HMAC signing method, the key can be any []byte. It is recommended to generate
// a key using crypto/rand or something equivalent. You need the same key for signing
// and validating.
var hmacSampleSecret []byte
func init() {
// Load sample key data
if keyData, e := ioutil.ReadFile("test/hmacTestKey"); e == nil {
hmacSampleSecret = keyData
} else {
panic(e)
}
}
// Example creating, signing, and encoding a JWT token using the HMAC signing method
func ExampleNew_hmac() {
// Create a new token object, specifying signing method and the claims
// you would like it to contain.
token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
"foo": "bar",
"nbf": time.Date(2015, 10, 10, 12, 0, 0, 0, time.UTC).Unix(),
})
// Sign and get the complete encoded token as a string using the secret
tokenString, err := token.SignedString(hmacSampleSecret)
fmt.Println(tokenString, err)
// Output: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJuYmYiOjE0NDQ0Nzg0MDB9.u1riaD1rW97opCoAuRCTy4w58Br-Zk-bh7vLiRIsrpU <nil>
}
// Example parsing and validating a token using the HMAC signing method
func ExampleParse_hmac() {
// sample token string taken from the New example
tokenString := "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJuYmYiOjE0NDQ0Nzg0MDB9.u1riaD1rW97opCoAuRCTy4w58Br-Zk-bh7vLiRIsrpU"
// Parse takes the token string and a function for looking up the key. The latter is especially
// useful if you use multiple keys for your application. The standard is to use 'kid' in the
// head of the token to identify which key to use, but the parsed token (head and claims) is provided
// to the callback, providing flexibility.
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
// Don't forget to validate the alg is what you expect:
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
// hmacSampleSecret is a []byte containing your secret, e.g. []byte("my_secret_key")
return hmacSampleSecret, nil
})
if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
fmt.Println(claims["foo"], claims["nbf"])