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idtoken.go
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idtoken.go
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// Copyright The Athenz Authors
// Licensed under the terms of the Apache version 2.0 license. See LICENSE file for terms.
package athenzutils
import (
"encoding/json"
"errors"
"github.com/AthenZ/athenz/clients/go/zts"
"gopkg.in/square/go-jose.v2/jwt"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
authv1 "k8s.io/client-go/pkg/apis/clientauthentication/v1"
"strings"
"time"
)
func FetchIdToken(ztsURL, svcKeyFile, svcCertFile, svcCACertFile, clientId, redirectUri, scope, nonce, state, keyType string, fullArn *bool, proxy bool, expireTime *int32) (string, error) {
client, err := ZtsClient(ztsURL, svcKeyFile, svcCertFile, svcCACertFile, proxy)
if err != nil {
return "", err
}
client.DisableRedirect = true
// request an id token
_, location, err := client.GetOIDCResponse("id_token", zts.ServiceName(clientId), redirectUri, scope, zts.EntityName(state), zts.EntityName(nonce), zts.SimpleName(keyType), fullArn, expireTime)
if err != nil {
return "", err
}
//the format of the location header is <redirect-uri>#id_token=<token>&state=<state>
idTokenLabel := "#id_token="
startIdx := strings.Index(location, idTokenLabel)
if startIdx == -1 {
return "", errors.New("location header does not contain id_token field")
}
idToken := location[startIdx+len(idTokenLabel):]
endIdx := strings.Index(idToken, "&state")
if endIdx != -1 {
idToken = idToken[:endIdx]
}
return idToken, nil
}
func FetchIdTokenExpiryTime(idToken string) (*time.Time, error) {
tok, err := jwt.ParseSigned(idToken)
if err != nil {
return nil, err
}
var claims map[string]interface{}
err = tok.UnsafeClaimsWithoutVerification(&claims)
if err != nil {
return nil, err
}
sec := claims["exp"].(float64)
expiryTime := time.Unix(int64(sec), 0)
return &expiryTime, nil
}
func GetK8SClientAuthCredential(idToken string) (string, error) {
expiryTime, err := FetchIdTokenExpiryTime(idToken)
if err != nil {
return "", err
}
metaType := metav1.TypeMeta{
Kind: "ExecCredential",
APIVersion: "client.authentication.k8s.io/v1",
}
metaExpiryTime := metav1.NewTime(*expiryTime)
status := authv1.ExecCredentialStatus{
Token: idToken,
ExpirationTimestamp: &metaExpiryTime,
}
creds := authv1.ExecCredential{
TypeMeta: metaType,
Status: &status,
}
output, err := json.Marshal(creds)
if err != nil {
return "", err
}
return string(output), nil
}