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update example for get jwt token via sa #275

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Jan 17, 2022
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update example for get jwt token via sa #275

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31 changes: 10 additions & 21 deletions ru/iam/operations/iam-token/create-for-sa.md
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Original file line number Diff line number Diff line change
Expand Up @@ -241,15 +241,15 @@ yc iam create-token

- Go

Пример создания JWT с использованием [jwt-go](https://github.com/dgrijalva/jwt-go):
Пример создания JWT с использованием [golang-jwt](https://github.com/golang-jwt/jwt):

```go
import (
"crypto/rsa"
"io/ioutil"
"time"

"github.com/dgrijalva/jwt-go"
"github.com/golang-jwt/jwt/v4"
)

const (
Expand All @@ -260,13 +260,14 @@ yc iam create-token

// Формирование JWT.
func signedToken() string {
issuedAt := time.Now()
token := jwt.NewWithClaims(ps256WithSaltLengthEqualsHash, jwt.StandardClaims{
Issuer: serviceAccountID,
IssuedAt: issuedAt.Unix(),
ExpiresAt: issuedAt.Add(time.Hour).Unix(),
Audience: "https://iam.api.cloud.yandex.net/iam/v1/tokens",
})
claims := jwt.RegisteredClaims{
Issuer: serviceAccountID,
ExpiresAt: jwt.NewNumericDate(time.Now().Add(1 * time.Hour)),
IssuedAt: jwt.NewNumericDate(time.Now()),
NotBefore: jwt.NewNumericDate(time.Now()),
Audience: []string{"https://iam.api.cloud.yandex.net/iam/v1/tokens"},
}
token := jwt.NewWithClaims(jwt.SigningMethodPS256, claims)
token.Header["kid"] = keyID

privateKey := loadPrivateKey()
Expand All @@ -277,18 +278,6 @@ yc iam create-token
return signed
}

// По умолчанию Go RSA PSS использует PSSSaltLengthAuto,
// но на странице https://tools.ietf.org/html/rfc7518#section-3.5 сказано, что
// размер значения соли должен совпадать с размером вывода хеш-функции.
// После исправления https://github.com/dgrijalva/jwt-go/issues/285
// можно будет заменить на jwt.SigningMethodPS256.
var ps256WithSaltLengthEqualsHash = &jwt.SigningMethodRSAPSS{
SigningMethodRSA: jwt.SigningMethodPS256.SigningMethodRSA,
Options: &rsa.PSSOptions{
SaltLength: rsa.PSSSaltLengthEqualsHash,
},
}

func loadPrivateKey() *rsa.PrivateKey {
data, err := ioutil.ReadFile(keyFile)
if err != nil {
Expand Down