Created
April 3, 2023 11:49
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Golang Auth0 Verify idToken Tool
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package auth0 | |
import ( | |
"crypto/rsa" | |
"encoding/base64" | |
"fmt" | |
"github.com/go-jose/go-jose/v3/jwt" | |
jwtPkg "github.com/golang-jwt/jwt" | |
"github.com/tidwall/gjson" | |
"io" | |
"net/http" | |
"regexp" | |
"strings" | |
) | |
func GetAuth0JWKSInfo(auth0Domain string) ([]byte, error) { | |
resp, err := http.Get(auth0Domain + "/.well-known/jwks.json") | |
if err != nil { | |
return nil, err | |
} | |
defer resp.Body.Close() | |
return io.ReadAll(resp.Body) | |
} | |
func GetAuth0JWKSPublicKeyCert(jwksInfo []byte, idToken string) (cert string, err error) { | |
jwtHeader, err := base64.StdEncoding.DecodeString(strings.SplitN(idToken, ".", 2)[0]) | |
if err != nil { | |
return "", err | |
} | |
for _, key := range gjson.GetBytes(jwksInfo, "keys").Array() { | |
if key.Get("kid").String() == gjson.GetBytes(jwtHeader, "kid").String() { | |
cert = key.Get("x5c").Array()[0].String() | |
} | |
} | |
return | |
} | |
func ParseAuth0RSAPublicKeyFromCert(cert string) (*rsa.PublicKey, error) { | |
return jwtPkg.ParseRSAPublicKeyFromPEM( | |
[]byte( | |
fmt.Sprintf("-----BEGIN CERTIFICATE-----\n%s\n-----END CERTIFICATE-----\n", | |
strings.Join(regexp.MustCompile(`.{1,64}`).FindAllString(cert, -1), "\n"), | |
), | |
), | |
) | |
} | |
func VerifyAuth0RS256IDToken(rsaPublicKey *rsa.PublicKey, idToken string) error { | |
token, err := jwt.ParseSigned(idToken) | |
if err != nil { | |
return err | |
} | |
return token.Claims(rsaPublicKey) | |
} |
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