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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