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package grpctool
import (
"context"
"time"
"github.com/golang-jwt/jwt/v5"
)
const (
jwtValidFor = 5 * time.Second
jwtNotBefore = 5 * time.Second
)
type JwtCredentials struct {
Secret []byte
Audience string
Issuer string
Insecure bool
}
func (c *JwtCredentials) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
now := time.Now()
claims := jwt.RegisteredClaims{
Issuer: c.Issuer,
Audience: jwt.ClaimStrings{c.Audience},
ExpiresAt: jwt.NewNumericDate(now.Add(jwtValidFor)),
NotBefore: jwt.NewNumericDate(now.Add(-jwtNotBefore)),
IssuedAt: jwt.NewNumericDate(now),
}
signedClaims, err := jwt.NewWithClaims(jwt.SigningMethodHS256, claims).
SignedString(c.Secret)
if err != nil {
return nil, err
}
return map[string]string{
MetadataAuthorization: "Bearer " + signedClaims,
}, nil
}
func (c *JwtCredentials) RequireTransportSecurity() bool {
return !c.Insecure
}
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